LCOV - code coverage report
Current view: top level - src/libavformat - asfdec_f.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 704 926 76.0 %
Date: 2017-01-24 04:42:20 Functions: 23 24 95.8 %

          Line data    Source code
       1             : /*
       2             :  * ASF compatible demuxer
       3             :  * Copyright (c) 2000, 2001 Fabrice Bellard
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : #include <inttypes.h>
      23             : 
      24             : #include "libavutil/attributes.h"
      25             : #include "libavutil/avassert.h"
      26             : #include "libavutil/avstring.h"
      27             : #include "libavutil/bswap.h"
      28             : #include "libavutil/common.h"
      29             : #include "libavutil/dict.h"
      30             : #include "libavutil/internal.h"
      31             : #include "libavutil/mathematics.h"
      32             : #include "libavutil/opt.h"
      33             : #include "avformat.h"
      34             : #include "avio_internal.h"
      35             : #include "avlanguage.h"
      36             : #include "id3v2.h"
      37             : #include "internal.h"
      38             : #include "riff.h"
      39             : #include "asf.h"
      40             : #include "asfcrypt.h"
      41             : 
      42             : typedef struct ASFPayload {
      43             :     uint8_t type;
      44             :     uint16_t size;
      45             : } ASFPayload;
      46             : 
      47             : typedef struct ASFStream {
      48             :     int num;
      49             :     unsigned char seq;
      50             :     /* use for reading */
      51             :     AVPacket pkt;
      52             :     int frag_offset;
      53             :     int packet_obj_size;
      54             :     int timestamp;
      55             :     int64_t duration;
      56             :     int skip_to_key;
      57             :     int pkt_clean;
      58             : 
      59             :     int ds_span;                /* descrambling  */
      60             :     int ds_packet_size;
      61             :     int ds_chunk_size;
      62             : 
      63             :     int64_t packet_pos;
      64             : 
      65             :     uint16_t stream_language_index;
      66             : 
      67             :     int      palette_changed;
      68             :     uint32_t palette[256];
      69             : 
      70             :     int payload_ext_ct;
      71             :     ASFPayload payload[8];
      72             : } ASFStream;
      73             : 
      74             : typedef struct ASFContext {
      75             :     const AVClass *class;
      76             :     int asfid2avid[128];                 ///< conversion table from asf ID 2 AVStream ID
      77             :     ASFStream streams[128];              ///< it's max number and it's not that big
      78             :     uint32_t stream_bitrates[128];       ///< max number of streams, bitrate for each (for streaming)
      79             :     AVRational dar[128];
      80             :     char stream_languages[128][6];       ///< max number of streams, language for each (RFC1766, e.g. en-US)
      81             :     /* non streamed additonnal info */
      82             :     /* packet filling */
      83             :     int packet_size_left;
      84             :     /* only for reading */
      85             :     uint64_t data_offset;                ///< beginning of the first data packet
      86             :     uint64_t data_object_offset;         ///< data object offset (excl. GUID & size)
      87             :     uint64_t data_object_size;           ///< size of the data object
      88             :     int index_read;
      89             : 
      90             :     ASFMainHeader hdr;
      91             : 
      92             :     int packet_flags;
      93             :     int packet_property;
      94             :     int packet_timestamp;
      95             :     int packet_segsizetype;
      96             :     int packet_segments;
      97             :     int packet_seq;
      98             :     int packet_replic_size;
      99             :     int packet_key_frame;
     100             :     int packet_padsize;
     101             :     unsigned int packet_frag_offset;
     102             :     unsigned int packet_frag_size;
     103             :     int64_t packet_frag_timestamp;
     104             :     int ts_is_pts;
     105             :     int packet_multi_size;
     106             :     int packet_time_delta;
     107             :     int packet_time_start;
     108             :     int64_t packet_pos;
     109             : 
     110             :     int stream_index;
     111             : 
     112             :     ASFStream *asf_st;                   ///< currently decoded stream
     113             : 
     114             :     int no_resync_search;
     115             :     int export_xmp;
     116             : 
     117             :     int uses_std_ecc;
     118             : } ASFContext;
     119             : 
     120             : static const AVOption options[] = {
     121             :     { "no_resync_search", "Don't try to resynchronize by looking for a certain optional start code", offsetof(ASFContext, no_resync_search), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
     122             :     { "export_xmp", "Export full XMP metadata", offsetof(ASFContext, export_xmp), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
     123             :     { NULL },
     124             : };
     125             : 
     126             : static const AVClass asf_class = {
     127             :     .class_name = "asf demuxer",
     128             :     .item_name  = av_default_item_name,
     129             :     .option     = options,
     130             :     .version    = LIBAVUTIL_VERSION_INT,
     131             : };
     132             : 
     133             : #undef NDEBUG
     134             : #include <assert.h>
     135             : 
     136             : #define ASF_MAX_STREAMS 127
     137             : #define FRAME_HEADER_SIZE 6
     138             : // Fix Me! FRAME_HEADER_SIZE may be different.
     139             : // (7 is known to be too large for GipsyGuitar.wmv)
     140             : 
     141             : #ifdef DEBUG
     142             : static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
     143             :     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
     144             : };
     145             : 
     146             : #define PRINT_IF_GUID(g, cmp) \
     147             :     if (!ff_guidcmp(g, &cmp)) \
     148             :         av_log(NULL, AV_LOG_TRACE, "(GUID: %s) ", # cmp)
     149             : 
     150             : static void print_guid(ff_asf_guid *g)
     151             : {
     152             :     int i;
     153             :     PRINT_IF_GUID(g, ff_asf_header);
     154             :     else PRINT_IF_GUID(g, ff_asf_file_header);
     155             :     else PRINT_IF_GUID(g, ff_asf_stream_header);
     156             :     else PRINT_IF_GUID(g, ff_asf_audio_stream);
     157             :     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
     158             :     else PRINT_IF_GUID(g, ff_asf_video_stream);
     159             :     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
     160             :     else PRINT_IF_GUID(g, ff_asf_command_stream);
     161             :     else PRINT_IF_GUID(g, ff_asf_comment_header);
     162             :     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
     163             :     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
     164             :     else PRINT_IF_GUID(g, ff_asf_data_header);
     165             :     else PRINT_IF_GUID(g, ff_asf_simple_index_header);
     166             :     else PRINT_IF_GUID(g, ff_asf_head1_guid);
     167             :     else PRINT_IF_GUID(g, ff_asf_head2_guid);
     168             :     else PRINT_IF_GUID(g, ff_asf_my_guid);
     169             :     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
     170             :     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
     171             :     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
     172             :     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
     173             :     else PRINT_IF_GUID(g, ff_asf_metadata_header);
     174             :     else PRINT_IF_GUID(g, ff_asf_metadata_library_header);
     175             :     else PRINT_IF_GUID(g, ff_asf_marker_header);
     176             :     else PRINT_IF_GUID(g, stream_bitrate_guid);
     177             :     else PRINT_IF_GUID(g, ff_asf_language_guid);
     178             :     else
     179             :         av_log(NULL, AV_LOG_TRACE, "(GUID: unknown) ");
     180             :     for (i = 0; i < 16; i++)
     181             :         av_log(NULL, AV_LOG_TRACE, " 0x%02x,", (*g)[i]);
     182             :     av_log(NULL, AV_LOG_TRACE, "}\n");
     183             : }
     184             : #undef PRINT_IF_GUID
     185             : #else
     186             : #define print_guid(g) while(0)
     187             : #endif
     188             : 
     189        5563 : static int asf_probe(AVProbeData *pd)
     190             : {
     191             :     /* check file header */
     192        5563 :     if (!ff_guidcmp(pd->buf, &ff_asf_header))
     193          32 :         return AVPROBE_SCORE_MAX;
     194             :     else
     195        5531 :         return 0;
     196             : }
     197             : 
     198             : /* size of type 2 (BOOL) is 32bit for "Extended Content Description Object"
     199             :  * but 16 bit for "Metadata Object" and "Metadata Library Object" */
     200          98 : static int get_value(AVIOContext *pb, int type, int type2_size)
     201             : {
     202          98 :     switch (type) {
     203             :     case 2:
     204          50 :         return (type2_size == 32) ? avio_rl32(pb) : avio_rl16(pb);
     205             :     case 3:
     206          45 :         return avio_rl32(pb);
     207             :     case 4:
     208           3 :         return avio_rl64(pb);
     209             :     case 5:
     210           0 :         return avio_rl16(pb);
     211             :     default:
     212           0 :         return INT_MIN;
     213             :     }
     214             : }
     215             : 
     216             : /* MSDN claims that this should be "compatible with the ID3 frame, APIC",
     217             :  * but in reality this is only loosely similar */
     218           3 : static int asf_read_picture(AVFormatContext *s, int len)
     219             : {
     220           3 :     AVPacket pkt          = { 0 };
     221           3 :     const CodecMime *mime = ff_id3v2_mime_tags;
     222           3 :     enum  AVCodecID id    = AV_CODEC_ID_NONE;
     223             :     char mimetype[64];
     224           3 :     uint8_t  *desc = NULL;
     225           3 :     AVStream   *st = NULL;
     226             :     int ret, type, picsize, desc_len;
     227             : 
     228             :     /* type + picsize + mime + desc */
     229           3 :     if (len < 1 + 4 + 2 + 2) {
     230           0 :         av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
     231           0 :         return AVERROR_INVALIDDATA;
     232             :     }
     233             : 
     234             :     /* picture type */
     235           3 :     type = avio_r8(s->pb);
     236           3 :     len--;
     237           3 :     if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) {
     238           0 :         av_log(s, AV_LOG_WARNING, "Unknown attached picture type: %d.\n", type);
     239           0 :         type = 0;
     240             :     }
     241             : 
     242             :     /* picture data size */
     243           3 :     picsize = avio_rl32(s->pb);
     244           3 :     len    -= 4;
     245             : 
     246             :     /* picture MIME type */
     247           3 :     len -= avio_get_str16le(s->pb, len, mimetype, sizeof(mimetype));
     248           9 :     while (mime->id != AV_CODEC_ID_NONE) {
     249           6 :         if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
     250           3 :             id = mime->id;
     251           3 :             break;
     252             :         }
     253           3 :         mime++;
     254             :     }
     255           3 :     if (id == AV_CODEC_ID_NONE) {
     256           0 :         av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
     257             :                mimetype);
     258           0 :         return 0;
     259             :     }
     260             : 
     261           3 :     if (picsize >= len) {
     262           0 :         av_log(s, AV_LOG_ERROR, "Invalid attached picture data size: %d >= %d.\n",
     263             :                picsize, len);
     264           0 :         return AVERROR_INVALIDDATA;
     265             :     }
     266             : 
     267             :     /* picture description */
     268           3 :     desc_len = (len - picsize) * 2 + 1;
     269           3 :     desc     = av_malloc(desc_len);
     270           3 :     if (!desc)
     271           0 :         return AVERROR(ENOMEM);
     272           3 :     len -= avio_get_str16le(s->pb, len - picsize, desc, desc_len);
     273             : 
     274           3 :     ret = av_get_packet(s->pb, &pkt, picsize);
     275           3 :     if (ret < 0)
     276           0 :         goto fail;
     277             : 
     278           3 :     st  = avformat_new_stream(s, NULL);
     279           3 :     if (!st) {
     280           0 :         ret = AVERROR(ENOMEM);
     281           0 :         goto fail;
     282             :     }
     283           3 :     st->disposition              |= AV_DISPOSITION_ATTACHED_PIC;
     284           3 :     st->codecpar->codec_type      = AVMEDIA_TYPE_VIDEO;
     285           3 :     st->codecpar->codec_id        = id;
     286           3 :     st->attached_pic              = pkt;
     287           3 :     st->attached_pic.stream_index = st->index;
     288           3 :     st->attached_pic.flags       |= AV_PKT_FLAG_KEY;
     289             : 
     290           3 :     if (*desc)
     291           2 :         av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL);
     292             :     else
     293           1 :         av_freep(&desc);
     294             : 
     295           3 :     av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);
     296             : 
     297           3 :     return 0;
     298             : 
     299             : fail:
     300           0 :     av_freep(&desc);
     301           0 :     av_packet_unref(&pkt);
     302           0 :     return ret;
     303             : }
     304             : 
     305           1 : static void get_id3_tag(AVFormatContext *s, int len)
     306             : {
     307           1 :     ID3v2ExtraMeta *id3v2_extra_meta = NULL;
     308             : 
     309           1 :     ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, len);
     310           1 :     if (id3v2_extra_meta)
     311           1 :         ff_id3v2_parse_apic(s, &id3v2_extra_meta);
     312           1 :     ff_id3v2_free_extra_meta(&id3v2_extra_meta);
     313           1 : }
     314             : 
     315         317 : static void get_tag(AVFormatContext *s, const char *key, int type, int len, int type2_size)
     316             : {
     317         317 :     ASFContext *asf = s->priv_data;
     318         317 :     char *value = NULL;
     319         317 :     int64_t off = avio_tell(s->pb);
     320             : #define LEN 22
     321             : 
     322         317 :     if ((unsigned)len >= (UINT_MAX - LEN) / 2)
     323           0 :         return;
     324             : 
     325         317 :     if (!asf->export_xmp && !strncmp(key, "xmp", 3))
     326           0 :         goto finish;
     327             : 
     328         317 :     value = av_malloc(2 * len + LEN);
     329         317 :     if (!value)
     330           0 :         goto finish;
     331             : 
     332         317 :     switch (type) {
     333             :     case ASF_UNICODE:
     334         192 :         avio_get_str16le(s->pb, len, value, 2 * len + 1);
     335         192 :         break;
     336             :     case -1: // ASCI
     337           3 :         avio_read(s->pb, value, len);
     338           3 :         value[len]=0;
     339           3 :         break;
     340             :     case ASF_BYTE_ARRAY:
     341          16 :         if (!strcmp(key, "WM/Picture")) { // handle cover art
     342           3 :             asf_read_picture(s, len);
     343          13 :         } else if (!strcmp(key, "ID3")) { // handle ID3 tag
     344           1 :             get_id3_tag(s, len);
     345             :         } else {
     346          12 :             av_log(s, AV_LOG_VERBOSE, "Unsupported byte array in tag %s.\n", key);
     347             :         }
     348          16 :         goto finish;
     349             :     case ASF_BOOL:
     350             :     case ASF_DWORD:
     351             :     case ASF_QWORD:
     352             :     case ASF_WORD: {
     353          96 :         uint64_t num = get_value(s->pb, type, type2_size);
     354          96 :         snprintf(value, LEN, "%"PRIu64, num);
     355          96 :         break;
     356             :     }
     357             :     case ASF_GUID:
     358          10 :         av_log(s, AV_LOG_DEBUG, "Unsupported GUID value in tag %s.\n", key);
     359          10 :         goto finish;
     360             :     default:
     361           0 :         av_log(s, AV_LOG_DEBUG,
     362             :                "Unsupported value type %d in tag %s.\n", type, key);
     363           0 :         goto finish;
     364             :     }
     365         291 :     if (*value)
     366         250 :         av_dict_set(&s->metadata, key, value, 0);
     367             : 
     368             : finish:
     369         317 :     av_freep(&value);
     370         317 :     avio_seek(s->pb, off + len, SEEK_SET);
     371             : }
     372             : 
     373          32 : static int asf_read_file_properties(AVFormatContext *s, int64_t size)
     374             : {
     375          32 :     ASFContext *asf = s->priv_data;
     376          32 :     AVIOContext *pb = s->pb;
     377             : 
     378          32 :     ff_get_guid(pb, &asf->hdr.guid);
     379          32 :     asf->hdr.file_size   = avio_rl64(pb);
     380          32 :     asf->hdr.create_time = avio_rl64(pb);
     381          32 :     avio_rl64(pb);                               /* number of packets */
     382          32 :     asf->hdr.play_time   = avio_rl64(pb);
     383          32 :     asf->hdr.send_time   = avio_rl64(pb);
     384          32 :     asf->hdr.preroll     = avio_rl32(pb);
     385          32 :     asf->hdr.ignore      = avio_rl32(pb);
     386          32 :     asf->hdr.flags       = avio_rl32(pb);
     387          32 :     asf->hdr.min_pktsize = avio_rl32(pb);
     388          32 :     asf->hdr.max_pktsize = avio_rl32(pb);
     389          32 :     if (asf->hdr.min_pktsize >= (1U << 29))
     390           0 :         return AVERROR_INVALIDDATA;
     391          32 :     asf->hdr.max_bitrate = avio_rl32(pb);
     392          32 :     s->packet_size       = asf->hdr.max_pktsize;
     393             : 
     394          32 :     return 0;
     395             : }
     396             : 
     397          43 : static int asf_read_stream_properties(AVFormatContext *s, int64_t size)
     398             : {
     399          43 :     ASFContext *asf = s->priv_data;
     400          43 :     AVIOContext *pb = s->pb;
     401             :     AVStream *st;
     402             :     ASFStream *asf_st;
     403             :     ff_asf_guid g;
     404             :     enum AVMediaType type;
     405             :     int type_specific_size, sizeX;
     406             :     unsigned int tag1;
     407             :     int64_t pos1, pos2, start_time;
     408          43 :     int test_for_ext_stream_audio, is_dvr_ms_audio = 0;
     409             : 
     410          43 :     if (s->nb_streams == ASF_MAX_STREAMS) {
     411           0 :         av_log(s, AV_LOG_ERROR, "too many streams\n");
     412           0 :         return AVERROR(EINVAL);
     413             :     }
     414             : 
     415          43 :     pos1 = avio_tell(pb);
     416             : 
     417          43 :     st = avformat_new_stream(s, NULL);
     418          43 :     if (!st)
     419           0 :         return AVERROR(ENOMEM);
     420          43 :     avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
     421          43 :     start_time     = asf->hdr.preroll;
     422             : 
     423          43 :     if (!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
     424          43 :         int64_t fsize = avio_size(pb);
     425          86 :         if (fsize <= 0 || (int64_t)asf->hdr.file_size <= 0 ||
     426          43 :             20*FFABS(fsize - (int64_t)asf->hdr.file_size) < FFMIN(fsize, asf->hdr.file_size))
     427          52 :             st->duration = asf->hdr.play_time /
     428          26 :                        (10000000 / 1000) - start_time;
     429             :     }
     430          43 :     ff_get_guid(pb, &g);
     431             : 
     432          43 :     test_for_ext_stream_audio = 0;
     433          43 :     if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
     434          24 :         type = AVMEDIA_TYPE_AUDIO;
     435          19 :     } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
     436          18 :         type = AVMEDIA_TYPE_VIDEO;
     437           1 :     } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
     438           0 :         type                = AVMEDIA_TYPE_VIDEO;
     439           0 :         st->codecpar->codec_id = AV_CODEC_ID_MJPEG;
     440           1 :     } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
     441           1 :         type = AVMEDIA_TYPE_DATA;
     442           0 :     } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
     443           0 :         test_for_ext_stream_audio = 1;
     444           0 :         type                      = AVMEDIA_TYPE_UNKNOWN;
     445             :     } else {
     446           0 :         return -1;
     447             :     }
     448          43 :     ff_get_guid(pb, &g);
     449          43 :     avio_skip(pb, 8); /* total_size */
     450          43 :     type_specific_size = avio_rl32(pb);
     451          43 :     avio_rl32(pb);
     452          43 :     st->id = avio_rl16(pb) & 0x7f; /* stream id */
     453             :     // mapping of asf ID to AV stream ID;
     454          43 :     asf->asfid2avid[st->id] = s->nb_streams - 1;
     455          43 :     asf_st = &asf->streams[st->id];
     456             : 
     457          43 :     avio_rl32(pb);
     458             : 
     459          43 :     if (test_for_ext_stream_audio) {
     460           0 :         ff_get_guid(pb, &g);
     461           0 :         if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
     462           0 :             type            = AVMEDIA_TYPE_AUDIO;
     463           0 :             is_dvr_ms_audio = 1;
     464           0 :             ff_get_guid(pb, &g);
     465           0 :             avio_rl32(pb);
     466           0 :             avio_rl32(pb);
     467           0 :             avio_rl32(pb);
     468           0 :             ff_get_guid(pb, &g);
     469           0 :             avio_rl32(pb);
     470             :         }
     471             :     }
     472             : 
     473          43 :     st->codecpar->codec_type = type;
     474          43 :     if (type == AVMEDIA_TYPE_AUDIO) {
     475          24 :         int ret = ff_get_wav_header(s, pb, st->codecpar, type_specific_size, 0);
     476          24 :         if (ret < 0)
     477           0 :             return ret;
     478          24 :         if (is_dvr_ms_audio) {
     479             :             // codec_id and codec_tag are unreliable in dvr_ms
     480             :             // files. Set them later by probing stream.
     481           0 :             st->request_probe    = 1;
     482           0 :             st->codecpar->codec_tag = 0;
     483             :         }
     484          24 :         if (st->codecpar->codec_id == AV_CODEC_ID_AAC)
     485           0 :             st->need_parsing = AVSTREAM_PARSE_NONE;
     486             :         else
     487          24 :             st->need_parsing = AVSTREAM_PARSE_FULL;
     488             :         /* We have to init the frame size at some point .... */
     489          24 :         pos2 = avio_tell(pb);
     490          24 :         if (size >= (pos2 + 8 - pos1 + 24)) {
     491          24 :             asf_st->ds_span        = avio_r8(pb);
     492          24 :             asf_st->ds_packet_size = avio_rl16(pb);
     493          24 :             asf_st->ds_chunk_size  = avio_rl16(pb);
     494          24 :             avio_rl16(pb);  // ds_data_size
     495          24 :             avio_r8(pb);    // ds_silence_data
     496             :         }
     497          24 :         if (asf_st->ds_span > 1) {
     498           2 :             if (!asf_st->ds_chunk_size                                ||
     499           1 :                 (asf_st->ds_packet_size / asf_st->ds_chunk_size <= 1) ||
     500           0 :                 asf_st->ds_packet_size % asf_st->ds_chunk_size)
     501           1 :                 asf_st->ds_span = 0;  // disable descrambling
     502             :         }
     503          37 :     } else if (type == AVMEDIA_TYPE_VIDEO &&
     504          18 :                size - (avio_tell(pb) - pos1 + 24) >= 51) {
     505          18 :         avio_rl32(pb);
     506          18 :         avio_rl32(pb);
     507          18 :         avio_r8(pb);
     508          18 :         avio_rl16(pb);        /* size */
     509          18 :         sizeX             = avio_rl32(pb); /* size */
     510          18 :         st->codecpar->width  = avio_rl32(pb);
     511          18 :         st->codecpar->height = avio_rl32(pb);
     512             :         /* not available for asf */
     513          18 :         avio_rl16(pb); /* panes */
     514          18 :         st->codecpar->bits_per_coded_sample = avio_rl16(pb); /* depth */
     515          18 :         tag1                             = avio_rl32(pb);
     516          18 :         avio_skip(pb, 20);
     517          18 :         if (sizeX > 40) {
     518           9 :             st->codecpar->extradata_size = ffio_limit(pb, sizeX - 40);
     519           9 :             st->codecpar->extradata      = av_mallocz(st->codecpar->extradata_size +
     520             :                                                    AV_INPUT_BUFFER_PADDING_SIZE);
     521           9 :             if (!st->codecpar->extradata)
     522           0 :                 return AVERROR(ENOMEM);
     523           9 :             avio_read(pb, st->codecpar->extradata, st->codecpar->extradata_size);
     524             :         }
     525             : 
     526             :         /* Extract palette from extradata if bpp <= 8 */
     527             :         /* This code assumes that extradata contains only palette */
     528             :         /* This is true for all paletted codecs implemented in libavcodec */
     529          18 :         if (st->codecpar->extradata_size && (st->codecpar->bits_per_coded_sample <= 8)) {
     530             : #if HAVE_BIGENDIAN
     531             :             int i;
     532             :             for (i = 0; i < FFMIN(st->codecpar->extradata_size, AVPALETTE_SIZE) / 4; i++)
     533             :                 asf_st->palette[i] = av_bswap32(((uint32_t *)st->codecpar->extradata)[i]);
     534             : #else
     535           0 :             memcpy(asf_st->palette, st->codecpar->extradata,
     536           0 :                    FFMIN(st->codecpar->extradata_size, AVPALETTE_SIZE));
     537             : #endif
     538           0 :             asf_st->palette_changed = 1;
     539             :         }
     540             : 
     541          18 :         st->codecpar->codec_tag = tag1;
     542          18 :         st->codecpar->codec_id  = ff_codec_get_id(ff_codec_bmp_tags, tag1);
     543          18 :         if (tag1 == MKTAG('D', 'V', 'R', ' ')) {
     544           0 :             st->need_parsing = AVSTREAM_PARSE_FULL;
     545             :             /* issue658 contains wrong w/h and MS even puts a fake seq header
     546             :              * with wrong w/h in extradata while a correct one is in the stream.
     547             :              * maximum lameness */
     548           0 :             st->codecpar->width      =
     549           0 :                 st->codecpar->height = 0;
     550           0 :             av_freep(&st->codecpar->extradata);
     551           0 :             st->codecpar->extradata_size = 0;
     552             :         }
     553          18 :         if (st->codecpar->codec_id == AV_CODEC_ID_H264)
     554           0 :             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
     555          18 :         if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4)
     556           0 :             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
     557             :     }
     558          43 :     pos2 = avio_tell(pb);
     559          43 :     avio_skip(pb, size - (pos2 - pos1 + 24));
     560             : 
     561          43 :     return 0;
     562             : }
     563             : 
     564          30 : static int asf_read_ext_stream_properties(AVFormatContext *s, int64_t size)
     565             : {
     566          30 :     ASFContext *asf = s->priv_data;
     567          30 :     AVIOContext *pb = s->pb;
     568             :     ff_asf_guid g;
     569             :     int ext_len, payload_ext_ct, stream_ct, i;
     570             :     uint32_t leak_rate, stream_num;
     571             :     unsigned int stream_languageid_index;
     572             : 
     573          30 :     avio_rl64(pb); // starttime
     574          30 :     avio_rl64(pb); // endtime
     575          30 :     leak_rate = avio_rl32(pb); // leak-datarate
     576          30 :     avio_rl32(pb); // bucket-datasize
     577          30 :     avio_rl32(pb); // init-bucket-fullness
     578          30 :     avio_rl32(pb); // alt-leak-datarate
     579          30 :     avio_rl32(pb); // alt-bucket-datasize
     580          30 :     avio_rl32(pb); // alt-init-bucket-fullness
     581          30 :     avio_rl32(pb); // max-object-size
     582          30 :     avio_rl32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
     583          30 :     stream_num = avio_rl16(pb); // stream-num
     584             : 
     585          30 :     stream_languageid_index = avio_rl16(pb); // stream-language-id-index
     586          30 :     if (stream_num < 128)
     587          30 :         asf->streams[stream_num].stream_language_index = stream_languageid_index;
     588             : 
     589          30 :     avio_rl64(pb); // avg frametime in 100ns units
     590          30 :     stream_ct      = avio_rl16(pb); // stream-name-count
     591          30 :     payload_ext_ct = avio_rl16(pb); // payload-extension-system-count
     592             : 
     593          30 :     if (stream_num < 128) {
     594          30 :         asf->stream_bitrates[stream_num] = leak_rate;
     595          30 :         asf->streams[stream_num].payload_ext_ct = 0;
     596             :     }
     597             : 
     598          30 :     for (i = 0; i < stream_ct; i++) {
     599           0 :         avio_rl16(pb);
     600           0 :         ext_len = avio_rl16(pb);
     601           0 :         avio_skip(pb, ext_len);
     602             :     }
     603             : 
     604          42 :     for (i = 0; i < payload_ext_ct; i++) {
     605             :         int size;
     606          12 :         ff_get_guid(pb, &g);
     607          12 :         size = avio_rl16(pb);
     608          12 :         ext_len = avio_rl32(pb);
     609          12 :         avio_skip(pb, ext_len);
     610          12 :         if (stream_num < 128 && i < FF_ARRAY_ELEMS(asf->streams[stream_num].payload)) {
     611          12 :             ASFPayload *p = &asf->streams[stream_num].payload[i];
     612          12 :             p->type = g[0];
     613          12 :             p->size = size;
     614          12 :             av_log(s, AV_LOG_DEBUG, "Payload extension %x %d\n", g[0], p->size );
     615          12 :             asf->streams[stream_num].payload_ext_ct ++;
     616             :         }
     617             :     }
     618             : 
     619          30 :     return 0;
     620             : }
     621             : 
     622          17 : static int asf_read_content_desc(AVFormatContext *s, int64_t size)
     623             : {
     624          17 :     AVIOContext *pb = s->pb;
     625             :     int len1, len2, len3, len4, len5;
     626             : 
     627          17 :     len1 = avio_rl16(pb);
     628          17 :     len2 = avio_rl16(pb);
     629          17 :     len3 = avio_rl16(pb);
     630          17 :     len4 = avio_rl16(pb);
     631          17 :     len5 = avio_rl16(pb);
     632          17 :     get_tag(s, "title", 0, len1, 32);
     633          17 :     get_tag(s, "author", 0, len2, 32);
     634          17 :     get_tag(s, "copyright", 0, len3, 32);
     635          17 :     get_tag(s, "comment", 0, len4, 32);
     636          17 :     avio_skip(pb, len5);
     637             : 
     638          17 :     return 0;
     639             : }
     640             : 
     641          32 : static int asf_read_ext_content_desc(AVFormatContext *s, int64_t size)
     642             : {
     643          32 :     AVIOContext *pb = s->pb;
     644          32 :     ASFContext *asf = s->priv_data;
     645             :     int desc_count, i, ret;
     646             : 
     647          32 :     desc_count = avio_rl16(pb);
     648         178 :     for (i = 0; i < desc_count; i++) {
     649             :         int name_len, value_type, value_len;
     650             :         char name[1024];
     651             : 
     652         146 :         name_len = avio_rl16(pb);
     653         146 :         if (name_len % 2)   // must be even, broken lavf versions wrote len-1
     654           0 :             name_len += 1;
     655         146 :         if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
     656           0 :             avio_skip(pb, name_len - ret);
     657         146 :         value_type = avio_rl16(pb);
     658         146 :         value_len  = avio_rl16(pb);
     659         146 :         if (!value_type && value_len % 2)
     660           0 :             value_len += 1;
     661             :         /* My sample has that stream set to 0 maybe that mean the container.
     662             :          * ASF stream count starts at 1. I am using 0 to the container value
     663             :          * since it's unused. */
     664         146 :         if (!strcmp(name, "AspectRatioX"))
     665           0 :             asf->dar[0].num = get_value(s->pb, value_type, 32);
     666         146 :         else if (!strcmp(name, "AspectRatioY"))
     667           0 :             asf->dar[0].den = get_value(s->pb, value_type, 32);
     668             :         else
     669         146 :             get_tag(s, name, value_type, value_len, 32);
     670             :     }
     671             : 
     672          32 :     return 0;
     673             : }
     674             : 
     675          23 : static int asf_read_language_list(AVFormatContext *s, int64_t size)
     676             : {
     677          23 :     AVIOContext *pb = s->pb;
     678          23 :     ASFContext *asf = s->priv_data;
     679             :     int j, ret;
     680          23 :     int stream_count = avio_rl16(pb);
     681          48 :     for (j = 0; j < stream_count; j++) {
     682             :         char lang[6];
     683          25 :         unsigned int lang_len = avio_r8(pb);
     684          25 :         if ((ret = avio_get_str16le(pb, lang_len, lang,
     685             :                                     sizeof(lang))) < lang_len)
     686           4 :             avio_skip(pb, lang_len - ret);
     687          25 :         if (j < 128)
     688          25 :             av_strlcpy(asf->stream_languages[j], lang,
     689             :                        sizeof(*asf->stream_languages));
     690             :     }
     691             : 
     692          23 :     return 0;
     693             : }
     694             : 
     695          25 : static int asf_read_metadata(AVFormatContext *s, int64_t size)
     696             : {
     697          25 :     AVIOContext *pb = s->pb;
     698          25 :     ASFContext *asf = s->priv_data;
     699             :     int n, stream_num, name_len_utf16, name_len_utf8, value_len;
     700             :     int ret, i;
     701          25 :     n = avio_rl16(pb);
     702             : 
     703         127 :     for (i = 0; i < n; i++) {
     704             :         uint8_t *name;
     705             :         int value_type;
     706             : 
     707         102 :         avio_rl16(pb);  // lang_list_index
     708         102 :         stream_num = avio_rl16(pb);
     709         102 :         name_len_utf16 = avio_rl16(pb);
     710         102 :         value_type = avio_rl16(pb); /* value_type */
     711         102 :         value_len  = avio_rl32(pb);
     712             : 
     713         102 :         name_len_utf8 = 2*name_len_utf16 + 1;
     714         102 :         name          = av_malloc(name_len_utf8);
     715         102 :         if (!name)
     716           0 :             return AVERROR(ENOMEM);
     717             : 
     718         102 :         if ((ret = avio_get_str16le(pb, name_len_utf16, name, name_len_utf8)) < name_len_utf16)
     719           0 :             avio_skip(pb, name_len_utf16 - ret);
     720         102 :         av_log(s, AV_LOG_TRACE, "%d stream %d name_len %2d type %d len %4d <%s>\n",
     721             :                 i, stream_num, name_len_utf16, value_type, value_len, name);
     722             : 
     723         102 :         if (!strcmp(name, "AspectRatioX")){
     724           1 :             int aspect_x = get_value(s->pb, value_type, 16);
     725           1 :             if(stream_num < 128)
     726           1 :                 asf->dar[stream_num].num = aspect_x;
     727         101 :         } else if(!strcmp(name, "AspectRatioY")){
     728           1 :             int aspect_y = get_value(s->pb, value_type, 16);
     729           1 :             if(stream_num < 128)
     730           1 :                 asf->dar[stream_num].den = aspect_y;
     731             :         } else {
     732         100 :             get_tag(s, name, value_type, value_len, 16);
     733             :         }
     734         102 :         av_freep(&name);
     735             :     }
     736             : 
     737          25 :     return 0;
     738             : }
     739             : 
     740           0 : static int asf_read_marker(AVFormatContext *s, int64_t size)
     741             : {
     742           0 :     AVIOContext *pb = s->pb;
     743           0 :     ASFContext *asf = s->priv_data;
     744             :     int i, count, name_len, ret;
     745             :     char name[1024];
     746             : 
     747           0 :     avio_rl64(pb);            // reserved 16 bytes
     748           0 :     avio_rl64(pb);            // ...
     749           0 :     count = avio_rl32(pb);    // markers count
     750           0 :     avio_rl16(pb);            // reserved 2 bytes
     751           0 :     name_len = avio_rl16(pb); // name length
     752           0 :     for (i = 0; i < name_len; i++)
     753           0 :         avio_r8(pb); // skip the name
     754             : 
     755           0 :     for (i = 0; i < count; i++) {
     756             :         int64_t pres_time;
     757             :         int name_len;
     758             : 
     759           0 :         avio_rl64(pb);             // offset, 8 bytes
     760           0 :         pres_time = avio_rl64(pb); // presentation time
     761           0 :         pres_time -= asf->hdr.preroll * 10000;
     762           0 :         avio_rl16(pb);             // entry length
     763           0 :         avio_rl32(pb);             // send time
     764           0 :         avio_rl32(pb);             // flags
     765           0 :         name_len = avio_rl32(pb);  // name length
     766           0 :         if ((ret = avio_get_str16le(pb, name_len * 2, name,
     767             :                                     sizeof(name))) < name_len)
     768           0 :             avio_skip(pb, name_len - ret);
     769           0 :         avpriv_new_chapter(s, i, (AVRational) { 1, 10000000 }, pres_time,
     770             :                            AV_NOPTS_VALUE, name);
     771             :     }
     772             : 
     773           0 :     return 0;
     774             : }
     775             : 
     776          32 : static int asf_read_header(AVFormatContext *s)
     777             : {
     778          32 :     ASFContext *asf = s->priv_data;
     779             :     ff_asf_guid g;
     780          32 :     AVIOContext *pb = s->pb;
     781             :     int i;
     782             :     int64_t gsize;
     783             : 
     784          32 :     ff_get_guid(pb, &g);
     785          32 :     if (ff_guidcmp(&g, &ff_asf_header))
     786           0 :         return AVERROR_INVALIDDATA;
     787          32 :     avio_rl64(pb);
     788          32 :     avio_rl32(pb);
     789          32 :     avio_r8(pb);
     790          32 :     avio_r8(pb);
     791          32 :     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
     792             : 
     793        4128 :     for (i = 0; i<128; i++)
     794        4096 :         asf->streams[i].stream_language_index = 128; // invalid stream index means no language info
     795             : 
     796         367 :     for (;;) {
     797         399 :         uint64_t gpos = avio_tell(pb);
     798         399 :         int ret = 0;
     799         399 :         ff_get_guid(pb, &g);
     800         399 :         gsize = avio_rl64(pb);
     801         399 :         print_guid(&g);
     802         399 :         if (!ff_guidcmp(&g, &ff_asf_data_header)) {
     803          32 :             asf->data_object_offset = avio_tell(pb);
     804             :             /* If not streaming, gsize is not unlimited (how?),
     805             :              * and there is enough space in the file.. */
     806          32 :             if (!(asf->hdr.flags & 0x01) && gsize >= 100)
     807          32 :                 asf->data_object_size = gsize - 24;
     808             :             else
     809           0 :                 asf->data_object_size = (uint64_t)-1;
     810          32 :             break;
     811             :         }
     812         367 :         if (gsize < 24)
     813           0 :             return AVERROR_INVALIDDATA;
     814         367 :         if (!ff_guidcmp(&g, &ff_asf_file_header)) {
     815          32 :             ret = asf_read_file_properties(s, gsize);
     816         335 :         } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
     817          43 :             ret = asf_read_stream_properties(s, gsize);
     818         292 :         } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
     819          17 :             asf_read_content_desc(s, gsize);
     820         275 :         } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
     821          23 :             asf_read_language_list(s, gsize);
     822         252 :         } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
     823          32 :             asf_read_ext_content_desc(s, gsize);
     824         220 :         } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
     825          22 :             asf_read_metadata(s, gsize);
     826         198 :         } else if (!ff_guidcmp(&g, &ff_asf_metadata_library_header)) {
     827           3 :             asf_read_metadata(s, gsize);
     828         195 :         } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
     829          30 :             asf_read_ext_stream_properties(s, gsize);
     830             : 
     831             :             // there could be an optional stream properties object to follow
     832             :             // if so the next iteration will pick it up
     833          30 :             continue;
     834         165 :         } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
     835          32 :             ff_get_guid(pb, &g);
     836          32 :             avio_skip(pb, 6);
     837          32 :             continue;
     838         133 :         } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
     839           0 :             asf_read_marker(s, gsize);
     840         133 :         } else if (avio_feof(pb)) {
     841           0 :             return AVERROR_EOF;
     842             :         } else {
     843         133 :             if (!s->keylen) {
     844         117 :                 if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
     845             :                     unsigned int len;
     846             :                     AVPacket pkt;
     847           1 :                     av_log(s, AV_LOG_WARNING,
     848             :                            "DRM protected stream detected, decoding will likely fail!\n");
     849           1 :                     len= avio_rl32(pb);
     850           1 :                     av_log(s, AV_LOG_DEBUG, "Secret data:\n");
     851             : 
     852           1 :                     if ((ret = av_get_packet(pb, &pkt, len)) < 0)
     853           0 :                         return ret;
     854           1 :                     av_hex_dump_log(s, AV_LOG_DEBUG, pkt.data, pkt.size);
     855           1 :                     av_packet_unref(&pkt);
     856           1 :                     len= avio_rl32(pb);
     857           1 :                     get_tag(s, "ASF_Protection_Type", -1, len, 32);
     858           1 :                     len= avio_rl32(pb);
     859           1 :                     get_tag(s, "ASF_Key_ID", -1, len, 32);
     860           1 :                     len= avio_rl32(pb);
     861           1 :                     get_tag(s, "ASF_License_URL", -1, len, 32);
     862         116 :                 } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
     863           0 :                     av_log(s, AV_LOG_WARNING,
     864             :                            "Ext DRM protected stream detected, decoding will likely fail!\n");
     865           0 :                     av_dict_set(&s->metadata, "encryption", "ASF Extended Content Encryption", 0);
     866         116 :                 } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
     867           0 :                     av_log(s, AV_LOG_INFO, "Digital signature detected!\n");
     868             :                 }
     869             :             }
     870             :         }
     871         305 :         if (ret < 0)
     872           0 :             return ret;
     873             : 
     874         305 :         if (avio_tell(pb) != gpos + gsize)
     875         132 :             av_log(s, AV_LOG_DEBUG,
     876             :                    "gpos mismatch our pos=%"PRIu64", end=%"PRId64"\n",
     877         132 :                    avio_tell(pb) - gpos, gsize);
     878         305 :         avio_seek(pb, gpos + gsize, SEEK_SET);
     879             :     }
     880          32 :     ff_get_guid(pb, &g);
     881          32 :     avio_rl64(pb);
     882          32 :     avio_r8(pb);
     883          32 :     avio_r8(pb);
     884          32 :     if (avio_feof(pb))
     885           0 :         return AVERROR_EOF;
     886          32 :     asf->data_offset      = avio_tell(pb);
     887          32 :     asf->packet_size_left = 0;
     888             : 
     889        4128 :     for (i = 0; i < 128; i++) {
     890        4096 :         int stream_num = asf->asfid2avid[i];
     891        4096 :         if (stream_num >= 0) {
     892          43 :             AVStream *st = s->streams[stream_num];
     893          43 :             if (!st->codecpar->bit_rate)
     894          19 :                 st->codecpar->bit_rate = asf->stream_bitrates[i];
     895          43 :             if (asf->dar[i].num > 0 && asf->dar[i].den > 0) {
     896           2 :                 av_reduce(&st->sample_aspect_ratio.num,
     897             :                           &st->sample_aspect_ratio.den,
     898           2 :                           asf->dar[i].num, asf->dar[i].den, INT_MAX);
     899          42 :             } else if ((asf->dar[0].num > 0) && (asf->dar[0].den > 0) &&
     900             :                        // Use ASF container value if the stream doesn't set AR.
     901           0 :                        (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO))
     902           0 :                 av_reduce(&st->sample_aspect_ratio.num,
     903             :                           &st->sample_aspect_ratio.den,
     904           0 :                           asf->dar[0].num, asf->dar[0].den, INT_MAX);
     905             : 
     906          86 :             av_log(s, AV_LOG_TRACE, "i=%d, st->codecpar->codec_type:%d, asf->dar %d:%d sar=%d:%d\n",
     907          43 :                     i, st->codecpar->codec_type, asf->dar[i].num, asf->dar[i].den,
     908             :                     st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
     909             : 
     910             :             // copy and convert language codes to the frontend
     911          43 :             if (asf->streams[i].stream_language_index < 128) {
     912          30 :                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
     913          30 :                 if (rfc1766 && strlen(rfc1766) > 1) {
     914          26 :                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
     915          26 :                     const char *iso6392       = ff_convert_lang_to(primary_tag,
     916             :                                                                    AV_LANG_ISO639_2_BIBL);
     917          26 :                     if (iso6392)
     918          26 :                         av_dict_set(&st->metadata, "language", iso6392, 0);
     919             :                 }
     920             :             }
     921             :         }
     922             :     }
     923             : 
     924          32 :     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
     925             : 
     926          32 :     return 0;
     927             : }
     928             : 
     929             : #define DO_2BITS(bits, var, defval)             \
     930             :     switch (bits & 3) {                         \
     931             :     case 3:                                     \
     932             :         var = avio_rl32(pb);                    \
     933             :         rsize += 4;                             \
     934             :         break;                                  \
     935             :     case 2:                                     \
     936             :         var = avio_rl16(pb);                    \
     937             :         rsize += 2;                             \
     938             :         break;                                  \
     939             :     case 1:                                     \
     940             :         var = avio_r8(pb);                      \
     941             :         rsize++;                                \
     942             :         break;                                  \
     943             :     default:                                    \
     944             :         var = defval;                           \
     945             :         break;                                  \
     946             :     }
     947             : 
     948             : /**
     949             :  * Load a single ASF packet into the demuxer.
     950             :  * @param s demux context
     951             :  * @param pb context to read data from
     952             :  * @return 0 on success, <0 on error
     953             :  */
     954        1944 : static int asf_get_packet(AVFormatContext *s, AVIOContext *pb)
     955             : {
     956        1944 :     ASFContext *asf = s->priv_data;
     957             :     uint32_t packet_length, padsize;
     958        1944 :     int rsize = 8;
     959             :     int c, d, e, off;
     960             : 
     961        1944 :     if (asf->uses_std_ecc > 0) {
     962             :         // if we do not know packet size, allow skipping up to 32 kB
     963        1912 :         off = 32768;
     964        1912 :         if (asf->no_resync_search)
     965           0 :             off = 3;
     966             : //         else if (s->packet_size > 0 && !asf->uses_std_ecc)
     967             : //             off = (avio_tell(pb) - s->internal->data_offset) % s->packet_size + 3;
     968             : 
     969        1912 :         c = d = e = -1;
     970        7648 :         while (off-- > 0) {
     971        5736 :             c = d;
     972        5736 :             d = e;
     973        5736 :             e = avio_r8(pb);
     974        5736 :             if (c == 0x82 && !d && !e)
     975        1912 :                 break;
     976             :         }
     977             : 
     978        1912 :         if (c != 0x82) {
     979             :             /* This code allows handling of -EAGAIN at packet boundaries (i.e.
     980             :             * if the packet sync code above triggers -EAGAIN). This does not
     981             :             * imply complete -EAGAIN handling support at random positions in
     982             :             * the stream. */
     983           0 :             if (pb->error == AVERROR(EAGAIN))
     984           0 :                 return AVERROR(EAGAIN);
     985           0 :             if (!avio_feof(pb))
     986           0 :                 av_log(s, AV_LOG_ERROR,
     987             :                     "ff asf bad header %x  at:%"PRId64"\n", c, avio_tell(pb));
     988             :         }
     989        1912 :         if ((c & 0x8f) == 0x82) {
     990        1912 :             if (d || e) {
     991           0 :                 if (!avio_feof(pb))
     992           0 :                     av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
     993           0 :                 return AVERROR_INVALIDDATA;
     994             :             }
     995        1912 :             c      = avio_r8(pb);
     996        1912 :             d      = avio_r8(pb);
     997        1912 :             rsize += 3;
     998           0 :         } else if(!avio_feof(pb)) {
     999           0 :             avio_seek(pb, -1, SEEK_CUR); // FIXME
    1000             :         }
    1001             :     } else {
    1002          32 :         c = avio_r8(pb);
    1003          32 :         if (c & 0x80) {
    1004          32 :             rsize ++;
    1005          32 :             if (!(c & 0x60)) {
    1006          32 :                 d = avio_r8(pb);
    1007          32 :                 e = avio_r8(pb);
    1008          32 :                 avio_seek(pb, (c & 0xF) - 2, SEEK_CUR);
    1009          32 :                 rsize += c & 0xF;
    1010             :             }
    1011             : 
    1012          32 :             if (c != 0x82)
    1013           0 :                 avpriv_request_sample(s, "Invalid ECC byte");
    1014             : 
    1015          32 :             if (!asf->uses_std_ecc)
    1016          32 :                 asf->uses_std_ecc =  (c == 0x82 && !d && !e) ? 1 : -1;
    1017             : 
    1018          32 :             c = avio_r8(pb);
    1019             :         } else
    1020           0 :             asf->uses_std_ecc =  -1;
    1021          32 :         d = avio_r8(pb);
    1022             :     }
    1023             : 
    1024        1944 :     asf->packet_flags    = c;
    1025        1944 :     asf->packet_property = d;
    1026             : 
    1027        1944 :     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
    1028        1944 :     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
    1029        1944 :     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
    1030             : 
    1031             :     // the following checks prevent overflows and infinite loops
    1032        1944 :     if (!packet_length || packet_length >= (1U << 29)) {
    1033           0 :         av_log(s, AV_LOG_ERROR,
    1034             :                "invalid packet_length %"PRIu32" at:%"PRId64"\n",
    1035             :                packet_length, avio_tell(pb));
    1036           0 :         return AVERROR_INVALIDDATA;
    1037             :     }
    1038        1944 :     if (padsize >= packet_length) {
    1039           0 :         av_log(s, AV_LOG_ERROR,
    1040             :                "invalid padsize %"PRIu32" at:%"PRId64"\n", padsize, avio_tell(pb));
    1041           0 :         return AVERROR_INVALIDDATA;
    1042             :     }
    1043             : 
    1044        1944 :     asf->packet_timestamp = avio_rl32(pb);
    1045        1944 :     avio_rl16(pb); /* duration */
    1046             :     // rsize has at least 11 bytes which have to be present
    1047             : 
    1048        1944 :     if (asf->packet_flags & 0x01) {
    1049         933 :         asf->packet_segsizetype = avio_r8(pb);
    1050         933 :         rsize++;
    1051         933 :         asf->packet_segments = asf->packet_segsizetype & 0x3f;
    1052             :     } else {
    1053        1011 :         asf->packet_segments    = 1;
    1054        1011 :         asf->packet_segsizetype = 0x80;
    1055             :     }
    1056        1944 :     if (rsize > packet_length - padsize) {
    1057           0 :         asf->packet_size_left = 0;
    1058           0 :         av_log(s, AV_LOG_ERROR,
    1059             :                "invalid packet header length %d for pktlen %"PRIu32"-%"PRIu32" at %"PRId64"\n",
    1060             :                rsize, packet_length, padsize, avio_tell(pb));
    1061           0 :         return AVERROR_INVALIDDATA;
    1062             :     }
    1063        1944 :     asf->packet_size_left = packet_length - padsize - rsize;
    1064        1944 :     if (packet_length < asf->hdr.min_pktsize)
    1065           0 :         padsize += asf->hdr.min_pktsize - packet_length;
    1066        1944 :     asf->packet_padsize = padsize;
    1067        1944 :     av_log(s, AV_LOG_TRACE, "packet: size=%d padsize=%d  left=%d\n",
    1068             :             s->packet_size, asf->packet_padsize, asf->packet_size_left);
    1069        1944 :     return 0;
    1070             : }
    1071             : 
    1072             : /**
    1073             :  *
    1074             :  * @return <0 if error
    1075             :  */
    1076        3916 : static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb)
    1077             : {
    1078        3916 :     ASFContext *asf = s->priv_data;
    1079             :     ASFStream *asfst;
    1080        3916 :     int rsize       = 1;
    1081        3916 :     int num         = avio_r8(pb);
    1082             :     int i;
    1083             :     int64_t ts0, ts1 av_unused;
    1084             : 
    1085        3916 :     asf->packet_segments--;
    1086        3916 :     asf->packet_key_frame = num >> 7;
    1087        3916 :     asf->stream_index     = asf->asfid2avid[num & 0x7f];
    1088        3916 :     asfst                 = &asf->streams[num & 0x7f];
    1089             :     // sequence should be ignored!
    1090        3916 :     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
    1091        3916 :     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
    1092        3916 :     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
    1093        3916 :     av_log(asf, AV_LOG_TRACE, "key:%d stream:%d seq:%d offset:%d replic_size:%d num:%X packet_property %X\n",
    1094             :             asf->packet_key_frame, asf->stream_index, asf->packet_seq,
    1095             :             asf->packet_frag_offset, asf->packet_replic_size, num, asf->packet_property);
    1096        3916 :     if (rsize+(int64_t)asf->packet_replic_size > asf->packet_size_left) {
    1097           0 :         av_log(s, AV_LOG_ERROR, "packet_replic_size %d is invalid\n", asf->packet_replic_size);
    1098           0 :         return AVERROR_INVALIDDATA;
    1099             :     }
    1100        3916 :     if (asf->packet_replic_size >= 8) {
    1101        3786 :         int64_t end = avio_tell(pb) + asf->packet_replic_size;
    1102             :         AVRational aspect;
    1103        3786 :         asfst->packet_obj_size = avio_rl32(pb);
    1104        3786 :         if (asfst->packet_obj_size >= (1 << 24) || asfst->packet_obj_size < 0) {
    1105           0 :             av_log(s, AV_LOG_ERROR, "packet_obj_size %d invalid\n", asfst->packet_obj_size);
    1106           0 :             asfst->packet_obj_size = 0;
    1107           0 :             return AVERROR_INVALIDDATA;
    1108             :         }
    1109        3786 :         asf->packet_frag_timestamp = avio_rl32(pb); // timestamp
    1110             : 
    1111        5062 :         for (i = 0; i < asfst->payload_ext_ct; i++) {
    1112        1276 :             ASFPayload *p = &asfst->payload[i];
    1113        1276 :             int size = p->size;
    1114             :             int64_t payend;
    1115        1276 :             if (size == 0xFFFF)
    1116           0 :                 size = avio_rl16(pb);
    1117        1276 :             payend = avio_tell(pb) + size;
    1118        1276 :             if (payend > end) {
    1119           0 :                 av_log(s, AV_LOG_ERROR, "too long payload\n");
    1120           0 :                 break;
    1121             :             }
    1122        1276 :             switch (p->type) {
    1123             :             case 0x50:
    1124             : //              duration = avio_rl16(pb);
    1125        1108 :                 break;
    1126             :             case 0x54:
    1127         168 :                 aspect.num = avio_r8(pb);
    1128         168 :                 aspect.den = avio_r8(pb);
    1129         168 :                 if (aspect.num > 0 && aspect.den > 0 && asf->stream_index >= 0) {
    1130         168 :                     s->streams[asf->stream_index]->sample_aspect_ratio = aspect;
    1131             :                 }
    1132         168 :                 break;
    1133             :             case 0x2A:
    1134           0 :                 avio_skip(pb, 8);
    1135           0 :                 ts0 = avio_rl64(pb);
    1136           0 :                 ts1 = avio_rl64(pb);
    1137           0 :                 if (ts0!= -1) asf->packet_frag_timestamp = ts0/10000;
    1138           0 :                 else          asf->packet_frag_timestamp = AV_NOPTS_VALUE;
    1139           0 :                 asf->ts_is_pts = 1;
    1140           0 :                 break;
    1141             :             case 0x5B:
    1142             :             case 0xB7:
    1143             :             case 0xCC:
    1144             :             case 0xC0:
    1145             :             case 0xA0:
    1146             :                 //unknown
    1147           0 :                 break;
    1148             :             }
    1149        1276 :             avio_seek(pb, payend, SEEK_SET);
    1150             :         }
    1151             : 
    1152        3786 :         avio_seek(pb, end, SEEK_SET);
    1153        3786 :         rsize += asf->packet_replic_size; // FIXME - check validity
    1154         130 :     } else if (asf->packet_replic_size == 1) {
    1155             :         // multipacket - frag_offset is beginning timestamp
    1156         130 :         asf->packet_time_start     = asf->packet_frag_offset;
    1157         130 :         asf->packet_frag_offset    = 0;
    1158         130 :         asf->packet_frag_timestamp = asf->packet_timestamp;
    1159             : 
    1160         130 :         asf->packet_time_delta = avio_r8(pb);
    1161         130 :         rsize++;
    1162           0 :     } else if (asf->packet_replic_size != 0) {
    1163           0 :         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n",
    1164             :                asf->packet_replic_size);
    1165           0 :         return AVERROR_INVALIDDATA;
    1166             :     }
    1167        3916 :     if (asf->packet_flags & 0x01) {
    1168        2906 :         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
    1169        2906 :         if (rsize > asf->packet_size_left) {
    1170           0 :             av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
    1171           0 :             return AVERROR_INVALIDDATA;
    1172        2906 :         } else if (asf->packet_frag_size > asf->packet_size_left - rsize) {
    1173           0 :             if (asf->packet_frag_size > asf->packet_size_left - rsize + asf->packet_padsize) {
    1174           0 :                 av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid (%d>%d-%d+%d)\n",
    1175             :                        asf->packet_frag_size, asf->packet_size_left, rsize, asf->packet_padsize);
    1176           0 :                 return AVERROR_INVALIDDATA;
    1177             :             } else {
    1178           0 :                 int diff = asf->packet_frag_size - (asf->packet_size_left - rsize);
    1179           0 :                 asf->packet_size_left += diff;
    1180           0 :                 asf->packet_padsize   -= diff;
    1181             :             }
    1182             :         }
    1183             :     } else {
    1184        1010 :         asf->packet_frag_size = asf->packet_size_left - rsize;
    1185             :     }
    1186        3916 :     if (asf->packet_replic_size == 1) {
    1187         130 :         asf->packet_multi_size = asf->packet_frag_size;
    1188         130 :         if (asf->packet_multi_size > asf->packet_size_left)
    1189           0 :             return AVERROR_INVALIDDATA;
    1190             :     }
    1191        3916 :     asf->packet_size_left -= rsize;
    1192             : 
    1193        3916 :     return 0;
    1194             : }
    1195             : 
    1196             : /**
    1197             :  * Parse data from individual ASF packets (which were previously loaded
    1198             :  * with asf_get_packet()).
    1199             :  * @param s demux context
    1200             :  * @param pb context to read data from
    1201             :  * @param pkt pointer to store packet data into
    1202             :  * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
    1203             :  *          packets need to be loaded (through asf_get_packet())
    1204             :  */
    1205        4385 : static int asf_parse_packet(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
    1206             : {
    1207        4385 :     ASFContext *asf   = s->priv_data;
    1208        4385 :     ASFStream *asf_st = 0;
    1209        1577 :     for (;;) {
    1210             :         int ret;
    1211        5962 :         if (avio_feof(pb))
    1212          10 :             return AVERROR_EOF;
    1213        9909 :         if (asf->packet_size_left < FRAME_HEADER_SIZE ||
    1214        3958 :             asf->packet_segments < 1 && asf->packet_time_start == 0) {
    1215        1995 :             int ret = asf->packet_size_left + asf->packet_padsize;
    1216             : 
    1217        1995 :             if (asf->packet_size_left && asf->packet_size_left < FRAME_HEADER_SIZE)
    1218           0 :                 av_log(s, AV_LOG_WARNING, "Skip due to FRAME_HEADER_SIZE\n");
    1219             : 
    1220        1995 :             assert(ret >= 0);
    1221             :             /* fail safe */
    1222        1995 :             avio_skip(pb, ret);
    1223             : 
    1224        1995 :             asf->packet_pos = avio_tell(pb);
    1225        3990 :             if (asf->data_object_size != (uint64_t)-1 &&
    1226        1995 :                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
    1227          51 :                 return AVERROR_EOF;  /* Do not exceed the size of the data object */
    1228        1944 :             return 1;
    1229             :         }
    1230        3957 :         if (asf->packet_time_start == 0) {
    1231        3916 :             if (asf_read_frame_header(s, pb) < 0) {
    1232           0 :                 asf->packet_time_start = asf->packet_segments = 0;
    1233           0 :                 continue;
    1234             :             }
    1235        7832 :             if (asf->stream_index < 0 ||
    1236        7543 :                 s->streams[asf->stream_index]->discard >= AVDISCARD_ALL ||
    1237        6753 :                 (!asf->packet_key_frame &&
    1238        6252 :                  (s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY || asf->streams[s->streams[asf->stream_index]->id].skip_to_key))) {
    1239         304 :                 asf->packet_time_start = 0;
    1240             :                 /* unhandled packet (should not happen) */
    1241         304 :                 avio_skip(pb, asf->packet_frag_size);
    1242         304 :                 asf->packet_size_left -= asf->packet_frag_size;
    1243         304 :                 if (asf->stream_index < 0)
    1244           0 :                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n",
    1245             :                            asf->packet_frag_size);
    1246         304 :                 continue;
    1247             :             }
    1248        3612 :             asf->asf_st = &asf->streams[s->streams[asf->stream_index]->id];
    1249        3612 :             if (!asf->packet_frag_offset)
    1250        2367 :                 asf->asf_st->skip_to_key = 0;
    1251             :         }
    1252        3653 :         asf_st = asf->asf_st;
    1253        3653 :         av_assert0(asf_st);
    1254             : 
    1255        3653 :         if (!asf_st->frag_offset && asf->packet_frag_offset) {
    1256          30 :             av_log(s, AV_LOG_TRACE, "skipping asf data pkt with fragment offset for "
    1257             :                     "stream:%d, expected:%d but got %d from pkt)\n",
    1258             :                     asf->stream_index, asf_st->frag_offset,
    1259             :                     asf->packet_frag_offset);
    1260          30 :             avio_skip(pb, asf->packet_frag_size);
    1261          30 :             asf->packet_size_left -= asf->packet_frag_size;
    1262          30 :             continue;
    1263             :         }
    1264             : 
    1265        3623 :         if (asf->packet_replic_size == 1) {
    1266             :             // frag_offset is here used as the beginning timestamp
    1267         115 :             asf->packet_frag_timestamp = asf->packet_time_start;
    1268         115 :             asf->packet_time_start    += asf->packet_time_delta;
    1269         115 :             asf_st->packet_obj_size    = asf->packet_frag_size = avio_r8(pb);
    1270         115 :             asf->packet_size_left--;
    1271         115 :             asf->packet_multi_size--;
    1272         115 :             if (asf->packet_multi_size < asf_st->packet_obj_size) {
    1273          28 :                 asf->packet_time_start = 0;
    1274          28 :                 avio_skip(pb, asf->packet_multi_size);
    1275          28 :                 asf->packet_size_left -= asf->packet_multi_size;
    1276          28 :                 continue;
    1277             :             }
    1278          87 :             asf->packet_multi_size -= asf_st->packet_obj_size;
    1279             :         }
    1280             : 
    1281        4810 :         if (asf_st->pkt.size != asf_st->packet_obj_size ||
    1282             :             // FIXME is this condition sufficient?
    1283        1215 :             asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) {
    1284             :             int ret;
    1285             : 
    1286        2380 :             if (asf_st->pkt.data) {
    1287           0 :                 av_log(s, AV_LOG_INFO,
    1288             :                        "freeing incomplete packet size %d, new %d\n",
    1289             :                        asf_st->pkt.size, asf_st->packet_obj_size);
    1290           0 :                 asf_st->frag_offset = 0;
    1291           0 :                 av_packet_unref(&asf_st->pkt);
    1292             :             }
    1293             :             /* new packet */
    1294        2380 :             if ((ret = av_new_packet(&asf_st->pkt, asf_st->packet_obj_size)) < 0)
    1295           0 :                 return ret;
    1296        2380 :             asf_st->seq              = asf->packet_seq;
    1297        2380 :             if (asf->ts_is_pts) {
    1298           0 :                 asf_st->pkt.pts          = asf->packet_frag_timestamp - asf->hdr.preroll;
    1299             :             } else
    1300        2380 :                 asf_st->pkt.dts          = asf->packet_frag_timestamp - asf->hdr.preroll;
    1301        2380 :             asf_st->pkt.stream_index = asf->stream_index;
    1302        2380 :             asf_st->pkt.pos          = asf_st->packet_pos = asf->packet_pos;
    1303        2380 :             asf_st->pkt_clean        = 0;
    1304             : 
    1305        2380 :             if (asf_st->pkt.data && asf_st->palette_changed) {
    1306             :                 uint8_t *pal;
    1307           0 :                 pal = av_packet_new_side_data(&asf_st->pkt, AV_PKT_DATA_PALETTE,
    1308             :                                               AVPALETTE_SIZE);
    1309           0 :                 if (!pal) {
    1310           0 :                     av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n");
    1311             :                 } else {
    1312           0 :                     memcpy(pal, asf_st->palette, AVPALETTE_SIZE);
    1313           0 :                     asf_st->palette_changed = 0;
    1314             :                 }
    1315             :             }
    1316        7140 :             av_log(asf, AV_LOG_TRACE, "new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
    1317             :                     asf->stream_index, asf->packet_key_frame,
    1318        2380 :                     asf_st->pkt.flags & AV_PKT_FLAG_KEY,
    1319        2380 :                     s->streams[asf->stream_index]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO,
    1320             :                     asf_st->packet_obj_size);
    1321        2380 :             if (s->streams[asf->stream_index]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO)
    1322        1015 :                 asf->packet_key_frame = 1;
    1323        2380 :             if (asf->packet_key_frame)
    1324        1058 :                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
    1325             :         }
    1326             : 
    1327             :         /* read data */
    1328        3595 :         av_log(asf, AV_LOG_TRACE, "READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
    1329             :                 s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
    1330             :                 asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
    1331        3595 :         asf->packet_size_left -= asf->packet_frag_size;
    1332        3595 :         if (asf->packet_size_left < 0)
    1333           0 :             continue;
    1334             : 
    1335        7190 :         if (asf->packet_frag_offset >= asf_st->pkt.size ||
    1336        3595 :             asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset) {
    1337           0 :             av_log(s, AV_LOG_ERROR,
    1338             :                    "packet fragment position invalid %u,%u not in %u\n",
    1339             :                    asf->packet_frag_offset, asf->packet_frag_size,
    1340             :                    asf_st->pkt.size);
    1341           0 :             continue;
    1342             :         }
    1343             : 
    1344        3595 :         if (asf->packet_frag_offset != asf_st->frag_offset && !asf_st->pkt_clean) {
    1345           0 :             memset(asf_st->pkt.data + asf_st->frag_offset, 0, asf_st->pkt.size - asf_st->frag_offset);
    1346           0 :             asf_st->pkt_clean = 1;
    1347             :         }
    1348             : 
    1349        3595 :         ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,
    1350        3595 :                         asf->packet_frag_size);
    1351        3595 :         if (ret != asf->packet_frag_size) {
    1352           3 :             if (ret < 0 || asf->packet_frag_offset + ret == 0)
    1353           0 :                 return ret < 0 ? ret : AVERROR_EOF;
    1354             : 
    1355           3 :             if (asf_st->ds_span > 1) {
    1356             :                 // scrambling, we can either drop it completely or fill the remainder
    1357             :                 // TODO: should we fill the whole packet instead of just the current
    1358             :                 // fragment?
    1359           0 :                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
    1360           0 :                        asf->packet_frag_size - ret);
    1361           0 :                 ret = asf->packet_frag_size;
    1362             :             } else {
    1363             :                 // no scrambling, so we can return partial packets
    1364           3 :                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
    1365             :             }
    1366             :         }
    1367        3595 :         if (s->key && s->keylen == 20)
    1368         548 :             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
    1369             :                             ret);
    1370        3595 :         asf_st->frag_offset += ret;
    1371             :         /* test if whole packet is read */
    1372        3595 :         if (asf_st->frag_offset == asf_st->pkt.size) {
    1373             :             // workaround for macroshit radio DVR-MS files
    1374        2380 :             if (s->streams[asf->stream_index]->codecpar->codec_id == AV_CODEC_ID_MPEG2VIDEO &&
    1375           0 :                 asf_st->pkt.size > 100) {
    1376             :                 int i;
    1377           0 :                 for (i = 0; i < asf_st->pkt.size && !asf_st->pkt.data[i]; i++)
    1378             :                     ;
    1379           0 :                 if (i == asf_st->pkt.size) {
    1380           0 :                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
    1381           0 :                     asf_st->frag_offset = 0;
    1382           0 :                     av_packet_unref(&asf_st->pkt);
    1383           0 :                     continue;
    1384             :                 }
    1385             :             }
    1386             : 
    1387             :             /* return packet */
    1388        2380 :             if (asf_st->ds_span > 1) {
    1389           0 :                 if (asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span) {
    1390           0 :                     av_log(s, AV_LOG_ERROR,
    1391             :                            "pkt.size != ds_packet_size * ds_span (%d %d %d)\n",
    1392             :                            asf_st->pkt.size, asf_st->ds_packet_size,
    1393             :                            asf_st->ds_span);
    1394             :                 } else {
    1395             :                     /* packet descrambling */
    1396           0 :                     AVBufferRef *buf = av_buffer_alloc(asf_st->pkt.size +
    1397             :                                                        AV_INPUT_BUFFER_PADDING_SIZE);
    1398           0 :                     if (buf) {
    1399           0 :                         uint8_t *newdata = buf->data;
    1400           0 :                         int offset = 0;
    1401           0 :                         memset(newdata + asf_st->pkt.size, 0,
    1402             :                                AV_INPUT_BUFFER_PADDING_SIZE);
    1403           0 :                         while (offset < asf_st->pkt.size) {
    1404           0 :                             int off = offset / asf_st->ds_chunk_size;
    1405           0 :                             int row = off / asf_st->ds_span;
    1406           0 :                             int col = off % asf_st->ds_span;
    1407           0 :                             int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
    1408           0 :                             assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
    1409           0 :                             assert(idx + 1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
    1410           0 :                             memcpy(newdata + offset,
    1411           0 :                                    asf_st->pkt.data + idx * asf_st->ds_chunk_size,
    1412           0 :                                    asf_st->ds_chunk_size);
    1413           0 :                             offset += asf_st->ds_chunk_size;
    1414             :                         }
    1415           0 :                         av_buffer_unref(&asf_st->pkt.buf);
    1416           0 :                         asf_st->pkt.buf  = buf;
    1417           0 :                         asf_st->pkt.data = buf->data;
    1418             :                     }
    1419             :                 }
    1420             :             }
    1421        2380 :             asf_st->frag_offset         = 0;
    1422        2380 :             *pkt                        = asf_st->pkt;
    1423        2380 :             asf_st->pkt.buf             = 0;
    1424        2380 :             asf_st->pkt.size            = 0;
    1425        2380 :             asf_st->pkt.data            = 0;
    1426        2380 :             asf_st->pkt.side_data_elems = 0;
    1427        2380 :             asf_st->pkt.side_data       = NULL;
    1428        2380 :             break; // packet completed
    1429             :         }
    1430             :     }
    1431        2380 :     return 0;
    1432             : }
    1433             : 
    1434        2441 : static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
    1435             : {
    1436        2441 :     ASFContext *asf = s->priv_data;
    1437             : 
    1438        1944 :     for (;;) {
    1439             :         int ret;
    1440             : 
    1441             :         /* parse cached packets, if any */
    1442        4385 :         if ((ret = asf_parse_packet(s, s->pb, pkt)) <= 0)
    1443        4882 :             return ret;
    1444        1944 :         if ((ret = asf_get_packet(s, s->pb)) < 0)
    1445           0 :             assert(asf->packet_size_left < FRAME_HEADER_SIZE ||
    1446             :                    asf->packet_segments < 1);
    1447        1944 :         asf->packet_time_start = 0;
    1448             :     }
    1449             : }
    1450             : 
    1451             : // Added to support seeking after packets have been read
    1452             : // If information is not reset, read_packet fails due to
    1453             : // leftover information from previous reads
    1454          81 : static void asf_reset_header(AVFormatContext *s)
    1455             : {
    1456          81 :     ASFContext *asf = s->priv_data;
    1457             :     ASFStream *asf_st;
    1458             :     int i;
    1459             : 
    1460          81 :     asf->packet_size_left      = 0;
    1461          81 :     asf->packet_flags          = 0;
    1462          81 :     asf->packet_property       = 0;
    1463          81 :     asf->packet_timestamp      = 0;
    1464          81 :     asf->packet_segsizetype    = 0;
    1465          81 :     asf->packet_segments       = 0;
    1466          81 :     asf->packet_seq            = 0;
    1467          81 :     asf->packet_replic_size    = 0;
    1468          81 :     asf->packet_key_frame      = 0;
    1469          81 :     asf->packet_padsize        = 0;
    1470          81 :     asf->packet_frag_offset    = 0;
    1471          81 :     asf->packet_frag_size      = 0;
    1472          81 :     asf->packet_frag_timestamp = 0;
    1473          81 :     asf->packet_multi_size     = 0;
    1474          81 :     asf->packet_time_delta     = 0;
    1475          81 :     asf->packet_time_start     = 0;
    1476             : 
    1477       10449 :     for (i = 0; i < 128; i++) {
    1478       10368 :         asf_st = &asf->streams[i];
    1479       10368 :         av_packet_unref(&asf_st->pkt);
    1480       10368 :         asf_st->packet_obj_size = 0;
    1481       10368 :         asf_st->frag_offset = 0;
    1482       10368 :         asf_st->seq         = 0;
    1483             :     }
    1484          81 :     asf->asf_st = NULL;
    1485          81 : }
    1486             : 
    1487          26 : static void skip_to_key(AVFormatContext *s)
    1488             : {
    1489          26 :     ASFContext *asf = s->priv_data;
    1490             :     int i;
    1491             : 
    1492        3354 :     for (i = 0; i < 128; i++) {
    1493        3328 :         int j = asf->asfid2avid[i];
    1494        3328 :         ASFStream *asf_st = &asf->streams[i];
    1495        3328 :         if (j < 0 || s->streams[j]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO)
    1496        3302 :             continue;
    1497             : 
    1498          26 :         asf_st->skip_to_key = 1;
    1499             :     }
    1500          26 : }
    1501             : 
    1502          32 : static int asf_read_close(AVFormatContext *s)
    1503             : {
    1504          32 :     asf_reset_header(s);
    1505             : 
    1506          32 :     return 0;
    1507             : }
    1508             : 
    1509          23 : static int64_t asf_read_pts(AVFormatContext *s, int stream_index,
    1510             :                             int64_t *ppos, int64_t pos_limit)
    1511             : {
    1512          23 :     ASFContext *asf     = s->priv_data;
    1513          23 :     AVPacket pkt1, *pkt = &pkt1;
    1514             :     ASFStream *asf_st;
    1515             :     int64_t pts;
    1516          23 :     int64_t pos = *ppos;
    1517             :     int i;
    1518             :     int64_t start_pos[ASF_MAX_STREAMS];
    1519             : 
    1520          69 :     for (i = 0; i < s->nb_streams; i++)
    1521          46 :         start_pos[i] = pos;
    1522             : 
    1523          23 :     if (s->packet_size > 0)
    1524          69 :         pos = (pos + s->packet_size - 1 - s->internal->data_offset) /
    1525          46 :               s->packet_size * s->packet_size +
    1526          23 :               s->internal->data_offset;
    1527          23 :     *ppos = pos;
    1528          23 :     if (avio_seek(s->pb, pos, SEEK_SET) < 0)
    1529           0 :         return AV_NOPTS_VALUE;
    1530             : 
    1531          23 :     ff_read_frame_flush(s);
    1532          23 :     asf_reset_header(s);
    1533             :     for (;;) {
    1534          49 :         if (av_read_frame(s, pkt) < 0) {
    1535          15 :             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
    1536          15 :             return AV_NOPTS_VALUE;
    1537             :         }
    1538             : 
    1539          21 :         pts = pkt->dts;
    1540             : 
    1541          21 :         if (pkt->flags & AV_PKT_FLAG_KEY) {
    1542          21 :             i = pkt->stream_index;
    1543             : 
    1544          21 :             asf_st = &asf->streams[s->streams[i]->id];
    1545             : 
    1546             : //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
    1547          21 :             pos = asf_st->packet_pos;
    1548             :             av_assert1(pkt->pos == asf_st->packet_pos);
    1549             : 
    1550          21 :             av_add_index_entry(s->streams[i], pos, pts, pkt->size,
    1551          21 :                                pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
    1552          21 :             start_pos[i] = asf_st->packet_pos + 1;
    1553             : 
    1554          21 :             if (pkt->stream_index == stream_index) {
    1555           8 :                 av_packet_unref(pkt);
    1556           8 :                 break;
    1557             :             }
    1558             :         }
    1559          13 :         av_packet_unref(pkt);
    1560             :     }
    1561             : 
    1562           8 :     *ppos = pos;
    1563           8 :     return pts;
    1564             : }
    1565             : 
    1566           1 : static int asf_build_simple_index(AVFormatContext *s, int stream_index)
    1567             : {
    1568             :     ff_asf_guid g;
    1569           1 :     ASFContext *asf     = s->priv_data;
    1570           1 :     int64_t current_pos = avio_tell(s->pb);
    1571             :     int64_t ret;
    1572             : 
    1573           1 :     if((ret = avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET)) < 0) {
    1574           0 :         return ret;
    1575             :     }
    1576             : 
    1577           1 :     if ((ret = ff_get_guid(s->pb, &g)) < 0)
    1578           0 :         goto end;
    1579             : 
    1580             :     /* the data object can be followed by other top-level objects,
    1581             :      * skip them until the simple index object is reached */
    1582           2 :     while (ff_guidcmp(&g, &ff_asf_simple_index_header)) {
    1583           0 :         int64_t gsize = avio_rl64(s->pb);
    1584           0 :         if (gsize < 24 || avio_feof(s->pb)) {
    1585             :             goto end;
    1586             :         }
    1587           0 :         avio_skip(s->pb, gsize - 24);
    1588           0 :         if ((ret = ff_get_guid(s->pb, &g)) < 0)
    1589           0 :             goto end;
    1590             :     }
    1591             : 
    1592             :     {
    1593           1 :         int64_t itime, last_pos = -1;
    1594             :         int pct, ict;
    1595             :         int i;
    1596           1 :         int64_t av_unused gsize = avio_rl64(s->pb);
    1597           1 :         if ((ret = ff_get_guid(s->pb, &g)) < 0)
    1598           0 :             goto end;
    1599           1 :         itime = avio_rl64(s->pb);
    1600           1 :         pct   = avio_rl32(s->pb);
    1601           1 :         ict   = avio_rl32(s->pb);
    1602           1 :         av_log(s, AV_LOG_DEBUG,
    1603             :                "itime:0x%"PRIx64", pct:%d, ict:%d\n", itime, pct, ict);
    1604             : 
    1605           7 :         for (i = 0; i < ict; i++) {
    1606           6 :             int pktnum        = avio_rl32(s->pb);
    1607           6 :             int pktct         = avio_rl16(s->pb);
    1608           6 :             int64_t pos       = s->internal->data_offset + s->packet_size * (int64_t)pktnum;
    1609           6 :             int64_t index_pts = FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);
    1610             : 
    1611           6 :             if (pos != last_pos) {
    1612           3 :                 av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n",
    1613             :                        pktnum, pktct, index_pts);
    1614           3 :                 av_add_index_entry(s->streams[stream_index], pos, index_pts,
    1615           3 :                                    s->packet_size, 0, AVINDEX_KEYFRAME);
    1616           3 :                 last_pos = pos;
    1617             :             }
    1618             :         }
    1619           1 :         asf->index_read = ict > 1;
    1620             :     }
    1621             : end:
    1622             : //     if (avio_feof(s->pb)) {
    1623             : //         ret = 0;
    1624             : //     }
    1625           1 :     avio_seek(s->pb, current_pos, SEEK_SET);
    1626           1 :     return ret;
    1627             : }
    1628             : 
    1629          26 : static int asf_read_seek(AVFormatContext *s, int stream_index,
    1630             :                          int64_t pts, int flags)
    1631             : {
    1632          26 :     ASFContext *asf = s->priv_data;
    1633          26 :     AVStream *st    = s->streams[stream_index];
    1634          26 :     int ret = 0;
    1635             : 
    1636          26 :     if (s->packet_size <= 0)
    1637           0 :         return -1;
    1638             : 
    1639             :     /* Try using the protocol's read_seek if available */
    1640          26 :     if (s->pb) {
    1641          26 :         int64_t ret = avio_seek_time(s->pb, stream_index, pts, flags);
    1642          26 :         if (ret >= 0)
    1643           0 :             asf_reset_header(s);
    1644          26 :         if (ret != AVERROR(ENOSYS))
    1645           0 :             return ret;
    1646             :     }
    1647             : 
    1648             :     /* explicitly handle the case of seeking to 0 */
    1649          26 :     if (!pts) {
    1650           0 :         asf_reset_header(s);
    1651           0 :         avio_seek(s->pb, s->internal->data_offset, SEEK_SET);
    1652           0 :         return 0;
    1653             :     }
    1654             : 
    1655          26 :     if (!asf->index_read) {
    1656           1 :         ret = asf_build_simple_index(s, stream_index);
    1657           1 :         if (ret < 0)
    1658           0 :             asf->index_read = -1;
    1659             :     }
    1660             : 
    1661          26 :     if (asf->index_read > 0 && st->index_entries) {
    1662          26 :         int index = av_index_search_timestamp(st, pts, flags);
    1663          26 :         if (index >= 0) {
    1664             :             /* find the position */
    1665          18 :             uint64_t pos = st->index_entries[index].pos;
    1666             : 
    1667             :             /* do the seek */
    1668          18 :             av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
    1669          18 :             if(avio_seek(s->pb, pos, SEEK_SET) < 0)
    1670           0 :                 return -1;
    1671          18 :             asf_reset_header(s);
    1672          18 :             skip_to_key(s);
    1673          18 :             return 0;
    1674             :         }
    1675             :     }
    1676             :     /* no index or seeking by index failed */
    1677           8 :     if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)
    1678           0 :         return -1;
    1679           8 :     asf_reset_header(s);
    1680           8 :     skip_to_key(s);
    1681           8 :     return 0;
    1682             : }
    1683             : 
    1684             : AVInputFormat ff_asf_demuxer = {
    1685             :     .name           = "asf",
    1686             :     .long_name      = NULL_IF_CONFIG_SMALL("ASF (Advanced / Active Streaming Format)"),
    1687             :     .priv_data_size = sizeof(ASFContext),
    1688             :     .read_probe     = asf_probe,
    1689             :     .read_header    = asf_read_header,
    1690             :     .read_packet    = asf_read_packet,
    1691             :     .read_close     = asf_read_close,
    1692             :     .read_seek      = asf_read_seek,
    1693             :     .read_timestamp = asf_read_pts,
    1694             :     .flags          = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,
    1695             :     .priv_class     = &asf_class,
    1696             : };

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