LCOV - code coverage report
Current view: top level - libavformat - nsvdec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 238 329 72.3 %
Date: 2017-12-16 01:21:47 Functions: 8 9 88.9 %

          Line data    Source code
       1             : /*
       2             :  * NSV demuxer
       3             :  * Copyright (c) 2004 The FFmpeg Project
       4             :  *
       5             :  * first version by Francois Revol <revol@free.fr>
       6             :  *
       7             :  * This file is part of FFmpeg.
       8             :  *
       9             :  * FFmpeg is free software; you can redistribute it and/or
      10             :  * modify it under the terms of the GNU Lesser General Public
      11             :  * License as published by the Free Software Foundation; either
      12             :  * version 2.1 of the License, or (at your option) any later version.
      13             :  *
      14             :  * FFmpeg is distributed in the hope that it will be useful,
      15             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      16             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      17             :  * Lesser General Public License for more details.
      18             :  *
      19             :  * You should have received a copy of the GNU Lesser General Public
      20             :  * License along with FFmpeg; if not, write to the Free Software
      21             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      22             :  */
      23             : 
      24             : #include "libavutil/attributes.h"
      25             : #include "libavutil/mathematics.h"
      26             : #include "avformat.h"
      27             : #include "internal.h"
      28             : #include "libavutil/dict.h"
      29             : #include "libavutil/intreadwrite.h"
      30             : 
      31             : /* max bytes to crawl for trying to resync
      32             :  * stupid streaming servers don't start at chunk boundaries...
      33             :  */
      34             : #define NSV_MAX_RESYNC (500*1024)
      35             : #define NSV_MAX_RESYNC_TRIES 300
      36             : 
      37             : /*
      38             :  * References:
      39             :  * (1) http://www.multimedia.cx/nsv-format.txt
      40             :  * seems someone came to the same conclusions as me, and updated it:
      41             :  * (2) http://www.stud.ktu.lt/~vitslav/nsv/nsv-format.txt
      42             :  *     http://www.stud.ktu.lt/~vitslav/nsv/
      43             :  * official docs
      44             :  * (3) http://ultravox.aol.com/NSVFormat.rtf
      45             :  * Sample files:
      46             :  * (S1) http://www.nullsoft.com/nsv/samples/
      47             :  * http://www.nullsoft.com/nsv/samples/faster.nsv
      48             :  * http://streamripper.sourceforge.net/openbb/read.php?TID=492&page=4
      49             :  */
      50             : 
      51             : /*
      52             :  * notes on the header (Francois Revol):
      53             :  *
      54             :  * It is followed by strings, then a table, but nothing tells
      55             :  * where the table begins according to (1). After checking faster.nsv,
      56             :  * I believe NVSf[16-19] gives the size of the strings data
      57             :  * (that is the offset of the data table after the header).
      58             :  * After checking all samples from (S1) all confirms this.
      59             :  *
      60             :  * Then, about NSVf[12-15], faster.nsf has 179700. When viewing it in VLC,
      61             :  * I noticed there was about 1 NVSs chunk/s, so I ran
      62             :  * strings faster.nsv | grep NSVs | wc -l
      63             :  * which gave me 180. That leads me to think that NSVf[12-15] might be the
      64             :  * file length in milliseconds.
      65             :  * Let's try that:
      66             :  * for f in *.nsv; do HTIME="$(od -t x4 "$f" | head -1 | sed 's/.* //')"; echo "'$f' $((0x$HTIME))s = $((0x$HTIME/1000/60)):$((0x$HTIME/1000%60))"; done
      67             :  * except for nsvtrailer (which doesn't have an NSVf header), it reports correct time.
      68             :  *
      69             :  * nsvtrailer.nsv (S1) does not have any NSVf header, only NSVs chunks,
      70             :  * so the header seems to not be mandatory. (for streaming).
      71             :  *
      72             :  * index slice duration check (excepts nsvtrailer.nsv):
      73             :  * for f in [^n]*.nsv; do DUR="$(ffmpeg -i "$f" 2>/dev/null | grep 'NSVf duration' | cut -d ' ' -f 4)"; IC="$(ffmpeg -i "$f" 2>/dev/null | grep 'INDEX ENTRIES' | cut -d ' ' -f 2)"; echo "duration $DUR, slite time $(($DUR/$IC))"; done
      74             :  */
      75             : 
      76             : /*
      77             :  * TODO:
      78             :  * - handle timestamps !!!
      79             :  * - use index
      80             :  * - mime-type in probe()
      81             :  * - seek
      82             :  */
      83             : 
      84             : #if 0
      85             : struct NSVf_header {
      86             :     uint32_t chunk_tag; /* 'NSVf' */
      87             :     uint32_t chunk_size;
      88             :     uint32_t file_size; /* max 4GB ??? no one learns anything it seems :^) */
      89             :     uint32_t file_length; //unknown1;  /* what about MSB of file_size ? */
      90             :     uint32_t info_strings_size; /* size of the info strings */ //unknown2;
      91             :     uint32_t table_entries;
      92             :     uint32_t table_entries_used; /* the left ones should be -1 */
      93             : };
      94             : 
      95             : struct NSVs_header {
      96             :     uint32_t chunk_tag; /* 'NSVs' */
      97             :     uint32_t v4cc;      /* or 'NONE' */
      98             :     uint32_t a4cc;      /* or 'NONE' */
      99             :     uint16_t vwidth;    /* av_assert0(vwidth%16==0) */
     100             :     uint16_t vheight;   /* av_assert0(vheight%16==0) */
     101             :     uint8_t framerate;  /* value = (framerate&0x80)?frtable[frameratex0x7f]:framerate */
     102             :     uint16_t unknown;
     103             : };
     104             : 
     105             : struct nsv_avchunk_header {
     106             :     uint8_t vchunk_size_lsb;
     107             :     uint16_t vchunk_size_msb; /* value = (vchunk_size_msb << 4) | (vchunk_size_lsb >> 4) */
     108             :     uint16_t achunk_size;
     109             : };
     110             : 
     111             : struct nsv_pcm_header {
     112             :     uint8_t bits_per_sample;
     113             :     uint8_t channel_count;
     114             :     uint16_t sample_rate;
     115             : };
     116             : #endif
     117             : 
     118             : /* variation from avi.h */
     119             : /*typedef struct CodecTag {
     120             :     int id;
     121             :     unsigned int tag;
     122             : } CodecTag;*/
     123             : 
     124             : /* tags */
     125             : 
     126             : #define T_NSVF MKTAG('N', 'S', 'V', 'f') /* file header */
     127             : #define T_NSVS MKTAG('N', 'S', 'V', 's') /* chunk header */
     128             : #define T_TOC2 MKTAG('T', 'O', 'C', '2') /* extra index marker */
     129             : #define T_NONE MKTAG('N', 'O', 'N', 'E') /* null a/v 4CC */
     130             : #define T_SUBT MKTAG('S', 'U', 'B', 'T') /* subtitle aux data */
     131             : #define T_ASYN MKTAG('A', 'S', 'Y', 'N') /* async a/v aux marker */
     132             : #define T_KEYF MKTAG('K', 'E', 'Y', 'F') /* video keyframe aux marker (addition) */
     133             : 
     134             : #define TB_NSVF MKBETAG('N', 'S', 'V', 'f')
     135             : #define TB_NSVS MKBETAG('N', 'S', 'V', 's')
     136             : 
     137             : /* hardcoded stream indexes */
     138             : #define NSV_ST_VIDEO 0
     139             : #define NSV_ST_AUDIO 1
     140             : #define NSV_ST_SUBT 2
     141             : 
     142             : enum NSVStatus {
     143             :     NSV_UNSYNC,
     144             :     NSV_FOUND_NSVF,
     145             :     NSV_HAS_READ_NSVF,
     146             :     NSV_FOUND_NSVS,
     147             :     NSV_HAS_READ_NSVS,
     148             :     NSV_FOUND_BEEF,
     149             :     NSV_GOT_VIDEO,
     150             :     NSV_GOT_AUDIO,
     151             : };
     152             : 
     153             : typedef struct NSVStream {
     154             :     int frame_offset; /* current frame (video) or byte (audio) counter
     155             :                          (used to compute the pts) */
     156             :     int scale;
     157             :     int rate;
     158             :     int sample_size; /* audio only data */
     159             :     int start;
     160             : 
     161             :     int new_frame_offset; /* temporary storage (used during seek) */
     162             :     int cum_len; /* temporary storage (used during seek) */
     163             : } NSVStream;
     164             : 
     165             : typedef struct NSVContext {
     166             :     int  base_offset;
     167             :     int  NSVf_end;
     168             :     uint32_t *nsvs_file_offset;
     169             :     int index_entries;
     170             :     enum NSVStatus state;
     171             :     AVPacket ahead[2]; /* [v, a] if .data is !NULL there is something */
     172             :     /* cached */
     173             :     int64_t duration;
     174             :     uint32_t vtag, atag;
     175             :     uint16_t vwidth, vheight;
     176             :     int16_t avsync;
     177             :     AVRational framerate;
     178             :     uint32_t *nsvs_timestamps;
     179             : } NSVContext;
     180             : 
     181             : static const AVCodecTag nsv_codec_video_tags[] = {
     182             :     { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') },
     183             :     { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
     184             :     { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
     185             :     { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') },
     186             :     { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
     187             :     { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') },
     188             :     { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
     189             :     { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
     190             :     { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
     191             :     { AV_CODEC_ID_VP8, MKTAG('V', 'P', '8', '0') },
     192             : /*
     193             :     { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
     194             :     { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
     195             : */
     196             :     { AV_CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
     197             :     { AV_CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
     198             :     { AV_CODEC_ID_NONE, 0 },
     199             : };
     200             : 
     201             : static const AVCodecTag nsv_codec_audio_tags[] = {
     202             :     { AV_CODEC_ID_MP3,       MKTAG('M', 'P', '3', ' ') },
     203             :     { AV_CODEC_ID_AAC,       MKTAG('A', 'A', 'C', ' ') },
     204             :     { AV_CODEC_ID_AAC,       MKTAG('A', 'A', 'C', 'P') },
     205             :     { AV_CODEC_ID_AAC,       MKTAG('V', 'L', 'B', ' ') },
     206             :     { AV_CODEC_ID_SPEEX,     MKTAG('S', 'P', 'X', ' ') },
     207             :     { AV_CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') },
     208             :     { AV_CODEC_ID_NONE,      0 },
     209             : };
     210             : 
     211             : //static int nsv_load_index(AVFormatContext *s);
     212             : static int nsv_read_chunk(AVFormatContext *s, int fill_header);
     213             : 
     214             : /* try to find something we recognize, and set the state accordingly */
     215          93 : static int nsv_resync(AVFormatContext *s)
     216             : {
     217          93 :     NSVContext *nsv = s->priv_data;
     218          93 :     AVIOContext *pb = s->pb;
     219          93 :     uint32_t v = 0;
     220             :     int i;
     221             : 
     222         198 :     for (i = 0; i < NSV_MAX_RESYNC; i++) {
     223         198 :         if (avio_feof(pb)) {
     224           0 :             av_log(s, AV_LOG_TRACE, "NSV EOF\n");
     225           0 :             nsv->state = NSV_UNSYNC;
     226           0 :             return -1;
     227             :         }
     228         198 :         v <<= 8;
     229         198 :         v |= avio_r8(pb);
     230         198 :         if (i < 8) {
     231         198 :             av_log(s, AV_LOG_TRACE, "NSV resync: [%d] = %02"PRIx32"\n", i, v & 0x0FF);
     232             :         }
     233             : 
     234         198 :         if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
     235          87 :             av_log(s, AV_LOG_TRACE, "NSV resynced on BEEF after %d bytes\n", i+1);
     236          87 :             nsv->state = NSV_FOUND_BEEF;
     237          87 :             return 0;
     238             :         }
     239             :         /* we read as big-endian, thus the MK*BE* */
     240         111 :         if (v == TB_NSVF) { /* NSVf */
     241           1 :             av_log(s, AV_LOG_TRACE, "NSV resynced on NSVf after %d bytes\n", i+1);
     242           1 :             nsv->state = NSV_FOUND_NSVF;
     243           1 :             return 0;
     244             :         }
     245         110 :         if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
     246           5 :             av_log(s, AV_LOG_TRACE, "NSV resynced on NSVs after %d bytes\n", i+1);
     247           5 :             nsv->state = NSV_FOUND_NSVS;
     248           5 :             return 0;
     249             :         }
     250             : 
     251             :     }
     252           0 :     av_log(s, AV_LOG_TRACE, "NSV sync lost\n");
     253           0 :     return -1;
     254             : }
     255             : 
     256           1 : static int nsv_parse_NSVf_header(AVFormatContext *s)
     257             : {
     258           1 :     NSVContext *nsv = s->priv_data;
     259           1 :     AVIOContext *pb = s->pb;
     260             :     unsigned int av_unused file_size;
     261             :     unsigned int size;
     262             :     int64_t duration;
     263             :     int strings_size;
     264             :     int table_entries;
     265             :     int table_entries_used;
     266             : 
     267           1 :     nsv->state = NSV_UNSYNC; /* in case we fail */
     268             : 
     269           1 :     size = avio_rl32(pb);
     270           1 :     if (size < 28)
     271           0 :         return -1;
     272           1 :     nsv->NSVf_end = size;
     273             : 
     274           1 :     file_size = (uint32_t)avio_rl32(pb);
     275           1 :     av_log(s, AV_LOG_TRACE, "NSV NSVf chunk_size %u\n", size);
     276           1 :     av_log(s, AV_LOG_TRACE, "NSV NSVf file_size %u\n", file_size);
     277             : 
     278           1 :     nsv->duration = duration = avio_rl32(pb); /* in ms */
     279           1 :     av_log(s, AV_LOG_TRACE, "NSV NSVf duration %"PRId64" ms\n", duration);
     280             :     // XXX: store it in AVStreams
     281             : 
     282           1 :     strings_size = avio_rl32(pb);
     283           1 :     table_entries = avio_rl32(pb);
     284           1 :     table_entries_used = avio_rl32(pb);
     285           1 :     av_log(s, AV_LOG_TRACE, "NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
     286             :             strings_size, table_entries, table_entries_used);
     287           1 :     if (avio_feof(pb))
     288           0 :         return -1;
     289             : 
     290           1 :     av_log(s, AV_LOG_TRACE, "NSV got header; filepos %"PRId64"\n", avio_tell(pb));
     291             : 
     292           1 :     if (strings_size > 0) {
     293             :         char *strings; /* last byte will be '\0' to play safe with str*() */
     294             :         char *p, *endp;
     295             :         char *token, *value;
     296             :         char quote;
     297             : 
     298           1 :         p = strings = av_mallocz((size_t)strings_size + 1);
     299           1 :         if (!p)
     300           0 :             return AVERROR(ENOMEM);
     301           1 :         endp = strings + strings_size;
     302           1 :         avio_read(pb, strings, strings_size);
     303           3 :         while (p < endp) {
     304           2 :             while (*p == ' ')
     305           0 :                 p++; /* strip out spaces */
     306           1 :             if (p >= endp-2)
     307           0 :                 break;
     308           1 :             token = p;
     309           1 :             p = strchr(p, '=');
     310           1 :             if (!p || p >= endp-2)
     311             :                 break;
     312           1 :             *p++ = '\0';
     313           1 :             quote = *p++;
     314           1 :             value = p;
     315           1 :             p = strchr(p, quote);
     316           1 :             if (!p || p >= endp)
     317             :                 break;
     318           1 :             *p++ = '\0';
     319           1 :             av_log(s, AV_LOG_TRACE, "NSV NSVf INFO: %s='%s'\n", token, value);
     320           1 :             av_dict_set(&s->metadata, token, value, 0);
     321             :         }
     322           1 :         av_free(strings);
     323             :     }
     324           1 :     if (avio_feof(pb))
     325           0 :         return -1;
     326             : 
     327           1 :     av_log(s, AV_LOG_TRACE, "NSV got infos; filepos %"PRId64"\n", avio_tell(pb));
     328             : 
     329           1 :     if (table_entries_used > 0) {
     330             :         int i;
     331           1 :         nsv->index_entries = table_entries_used;
     332           1 :         if((unsigned)table_entries_used >= UINT_MAX / sizeof(uint32_t))
     333           0 :             return -1;
     334           1 :         nsv->nsvs_file_offset = av_malloc_array((unsigned)table_entries_used, sizeof(uint32_t));
     335           1 :         if (!nsv->nsvs_file_offset)
     336           0 :             return AVERROR(ENOMEM);
     337             : 
     338         101 :         for(i=0;i<table_entries_used;i++) {
     339         100 :             if (avio_feof(pb))
     340           0 :                 return AVERROR_INVALIDDATA;
     341         100 :             nsv->nsvs_file_offset[i] = avio_rl32(pb) + size;
     342             :         }
     343             : 
     344           1 :         if(table_entries > table_entries_used &&
     345           0 :            avio_rl32(pb) == MKTAG('T','O','C','2')) {
     346           0 :             nsv->nsvs_timestamps = av_malloc_array((unsigned)table_entries_used, sizeof(uint32_t));
     347           0 :             if (!nsv->nsvs_timestamps)
     348           0 :                 return AVERROR(ENOMEM);
     349           0 :             for(i=0;i<table_entries_used;i++) {
     350           0 :                 nsv->nsvs_timestamps[i] = avio_rl32(pb);
     351             :             }
     352             :         }
     353             :     }
     354             : 
     355           1 :     av_log(s, AV_LOG_TRACE, "NSV got index; filepos %"PRId64"\n", avio_tell(pb));
     356             : 
     357           1 :     avio_seek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
     358             : 
     359           1 :     if (avio_feof(pb))
     360           0 :         return -1;
     361           1 :     nsv->state = NSV_HAS_READ_NSVF;
     362           1 :     return 0;
     363             : }
     364             : 
     365           5 : static int nsv_parse_NSVs_header(AVFormatContext *s)
     366             : {
     367           5 :     NSVContext *nsv = s->priv_data;
     368           5 :     AVIOContext *pb = s->pb;
     369             :     uint32_t vtag, atag;
     370             :     uint16_t vwidth, vheight;
     371             :     AVRational framerate;
     372             :     int i;
     373             :     AVStream *st;
     374             :     NSVStream *nst;
     375             : 
     376           5 :     vtag = avio_rl32(pb);
     377           5 :     atag = avio_rl32(pb);
     378           5 :     vwidth = avio_rl16(pb);
     379           5 :     vheight = avio_rl16(pb);
     380           5 :     i = avio_r8(pb);
     381             : 
     382           5 :     av_log(s, AV_LOG_TRACE, "NSV NSVs framerate code %2x\n", i);
     383           5 :     if(i&0x80) { /* odd way of giving native framerates from docs */
     384           5 :         int t=(i & 0x7F)>>2;
     385           5 :         if(t<16) framerate = (AVRational){1, t+1};
     386           0 :         else     framerate = (AVRational){t-15, 1};
     387             : 
     388           5 :         if(i&1){
     389           5 :             framerate.num *= 1000;
     390           5 :             framerate.den *= 1001;
     391             :         }
     392             : 
     393           5 :         if((i&3)==3)      framerate.num *= 24;
     394           5 :         else if((i&3)==2) framerate.num *= 25;
     395           5 :         else              framerate.num *= 30;
     396             :     }
     397             :     else
     398           0 :         framerate= (AVRational){i, 1};
     399             : 
     400           5 :     nsv->avsync = avio_rl16(pb);
     401           5 :     nsv->framerate = framerate;
     402             : 
     403           5 :     av_log(s, AV_LOG_TRACE, "NSV NSVs vsize %dx%d\n", vwidth, vheight);
     404             : 
     405             :     /* XXX change to ap != NULL ? */
     406           5 :     if (s->nb_streams == 0) { /* streams not yet published, let's do that */
     407           1 :         nsv->vtag = vtag;
     408           1 :         nsv->atag = atag;
     409           1 :         nsv->vwidth = vwidth;
     410           1 :         nsv->vheight = vwidth;
     411           1 :         if (vtag != T_NONE) {
     412             :             int i;
     413           1 :             st = avformat_new_stream(s, NULL);
     414           1 :             if (!st)
     415           0 :                 goto fail;
     416             : 
     417           1 :             st->id = NSV_ST_VIDEO;
     418           1 :             nst = av_mallocz(sizeof(NSVStream));
     419           1 :             if (!nst)
     420           0 :                 goto fail;
     421           1 :             st->priv_data = nst;
     422           1 :             st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
     423           1 :             st->codecpar->codec_tag = vtag;
     424           1 :             st->codecpar->codec_id = ff_codec_get_id(nsv_codec_video_tags, vtag);
     425           1 :             st->codecpar->width = vwidth;
     426           1 :             st->codecpar->height = vheight;
     427           1 :             st->codecpar->bits_per_coded_sample = 24; /* depth XXX */
     428             : 
     429           1 :             avpriv_set_pts_info(st, 64, framerate.den, framerate.num);
     430           1 :             st->start_time = 0;
     431           1 :             st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den);
     432             : 
     433         101 :             for(i=0;i<nsv->index_entries;i++) {
     434         100 :                 if(nsv->nsvs_timestamps) {
     435           0 :                     av_add_index_entry(st, nsv->nsvs_file_offset[i], nsv->nsvs_timestamps[i],
     436             :                                        0, 0, AVINDEX_KEYFRAME);
     437             :                 } else {
     438         100 :                     int64_t ts = av_rescale(i*nsv->duration/nsv->index_entries, framerate.num, 1000*framerate.den);
     439         100 :                     av_add_index_entry(st, nsv->nsvs_file_offset[i], ts, 0, 0, AVINDEX_KEYFRAME);
     440             :                 }
     441             :             }
     442             :         }
     443           1 :         if (atag != T_NONE) {
     444           1 :             st = avformat_new_stream(s, NULL);
     445           1 :             if (!st)
     446           0 :                 goto fail;
     447             : 
     448           1 :             st->id = NSV_ST_AUDIO;
     449           1 :             nst = av_mallocz(sizeof(NSVStream));
     450           1 :             if (!nst)
     451           0 :                 goto fail;
     452           1 :             st->priv_data = nst;
     453           1 :             st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
     454           1 :             st->codecpar->codec_tag = atag;
     455           1 :             st->codecpar->codec_id = ff_codec_get_id(nsv_codec_audio_tags, atag);
     456             : 
     457           1 :             st->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */
     458             : 
     459             :             /* set timebase to common denominator of ms and framerate */
     460           1 :             avpriv_set_pts_info(st, 64, 1, framerate.num*1000);
     461           1 :             st->start_time = 0;
     462           1 :             st->duration = (int64_t)nsv->duration * framerate.num;
     463             :         }
     464             :     } else {
     465           4 :         if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
     466           0 :             av_log(s, AV_LOG_TRACE, "NSV NSVs header values differ from the first one!!!\n");
     467             :             //return -1;
     468             :         }
     469             :     }
     470             : 
     471           5 :     nsv->state = NSV_HAS_READ_NSVS;
     472           5 :     return 0;
     473           0 : fail:
     474             :     /* XXX */
     475           0 :     nsv->state = NSV_UNSYNC;
     476           0 :     return -1;
     477             : }
     478             : 
     479           1 : static int nsv_read_header(AVFormatContext *s)
     480             : {
     481           1 :     NSVContext *nsv = s->priv_data;
     482             :     int i, err;
     483             : 
     484           1 :     nsv->state = NSV_UNSYNC;
     485           1 :     nsv->ahead[0].data = nsv->ahead[1].data = NULL;
     486             : 
     487           2 :     for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
     488           2 :         if (nsv_resync(s) < 0)
     489           0 :             return -1;
     490           2 :         if (nsv->state == NSV_FOUND_NSVF) {
     491           1 :             err = nsv_parse_NSVf_header(s);
     492           1 :             if (err < 0)
     493           0 :                 return err;
     494             :         }
     495             :             /* we need the first NSVs also... */
     496           2 :         if (nsv->state == NSV_FOUND_NSVS) {
     497           1 :             err = nsv_parse_NSVs_header(s);
     498           1 :             if (err < 0)
     499           0 :                 return err;
     500           1 :             break; /* we just want the first one */
     501             :         }
     502             :     }
     503           1 :     if (s->nb_streams < 1) /* no luck so far */
     504           0 :         return -1;
     505             :     /* now read the first chunk, so we can attempt to decode more info */
     506           1 :     err = nsv_read_chunk(s, 1);
     507             : 
     508           1 :     av_log(s, AV_LOG_TRACE, "parsed header\n");
     509           1 :     return err;
     510             : }
     511             : 
     512          92 : static int nsv_read_chunk(AVFormatContext *s, int fill_header)
     513             : {
     514          92 :     NSVContext *nsv = s->priv_data;
     515          92 :     AVIOContext *pb = s->pb;
     516          92 :     AVStream *st[2] = {NULL, NULL};
     517             :     NSVStream *nst;
     518             :     AVPacket *pkt;
     519          92 :     int i, err = 0;
     520             :     uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
     521             :     uint32_t vsize;
     522             :     uint16_t asize;
     523             :     uint16_t auxsize;
     524             :     int ret;
     525             : 
     526          92 :     if (nsv->ahead[0].data || nsv->ahead[1].data)
     527           0 :         return 0; //-1; /* hey! eat what you've in your plate first! */
     528             : 
     529          92 : null_chunk_retry:
     530          92 :     if (avio_feof(pb))
     531           0 :         return -1;
     532             : 
     533         183 :     for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
     534          91 :         err = nsv_resync(s);
     535          92 :     if (err < 0)
     536           0 :         return err;
     537          92 :     if (nsv->state == NSV_FOUND_NSVS)
     538           4 :         err = nsv_parse_NSVs_header(s);
     539          92 :     if (err < 0)
     540           0 :         return err;
     541          92 :     if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
     542           0 :         return -1;
     543             : 
     544          92 :     auxcount = avio_r8(pb);
     545          92 :     vsize = avio_rl16(pb);
     546          92 :     asize = avio_rl16(pb);
     547          92 :     vsize = (vsize << 4) | (auxcount >> 4);
     548          92 :     auxcount &= 0x0f;
     549          92 :     av_log(s, AV_LOG_TRACE, "NSV CHUNK %d aux, %"PRIu32" bytes video, %d bytes audio\n", auxcount, vsize, asize);
     550             :     /* skip aux stuff */
     551          92 :     for (i = 0; i < auxcount; i++) {
     552             :         uint32_t av_unused auxtag;
     553           0 :         auxsize = avio_rl16(pb);
     554           0 :         auxtag = avio_rl32(pb);
     555           0 :         avio_skip(pb, auxsize);
     556           0 :         vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming brain-dead */
     557             :     }
     558             : 
     559          92 :     if (avio_feof(pb))
     560           0 :         return -1;
     561          92 :     if (!vsize && !asize) {
     562           0 :         nsv->state = NSV_UNSYNC;
     563           0 :         goto null_chunk_retry;
     564             :     }
     565             : 
     566             :     /* map back streams to v,a */
     567          92 :     if (s->nb_streams > 0)
     568          92 :         st[s->streams[0]->id] = s->streams[0];
     569          92 :     if (s->nb_streams > 1)
     570          92 :         st[s->streams[1]->id] = s->streams[1];
     571             : 
     572          92 :     if (vsize && st[NSV_ST_VIDEO]) {
     573          60 :         nst = st[NSV_ST_VIDEO]->priv_data;
     574          60 :         pkt = &nsv->ahead[NSV_ST_VIDEO];
     575          60 :         if ((ret = av_get_packet(pb, pkt, vsize)) < 0)
     576           0 :             return ret;
     577          60 :         pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
     578          60 :         pkt->dts = nst->frame_offset;
     579          60 :         pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
     580         540 :         for (i = 0; i < FFMIN(8, vsize); i++)
     581         480 :             av_log(s, AV_LOG_TRACE, "NSV video: [%d] = %02x\n", i, pkt->data[i]);
     582             :     }
     583          92 :     if(st[NSV_ST_VIDEO])
     584          92 :         ((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++;
     585             : 
     586          92 :     if (asize && st[NSV_ST_AUDIO]) {
     587          88 :         nst = st[NSV_ST_AUDIO]->priv_data;
     588          88 :         pkt = &nsv->ahead[NSV_ST_AUDIO];
     589             :         /* read raw audio specific header on the first audio chunk... */
     590             :         /* on ALL audio chunks ?? seems so! */
     591          88 :         if (asize && st[NSV_ST_AUDIO]->codecpar->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
     592             :             uint8_t bps;
     593             :             uint8_t channels;
     594             :             uint16_t samplerate;
     595           0 :             bps = avio_r8(pb);
     596           0 :             channels = avio_r8(pb);
     597           0 :             samplerate = avio_rl16(pb);
     598           0 :             if (!channels || !samplerate)
     599           0 :                 return AVERROR_INVALIDDATA;
     600           0 :             asize-=4;
     601           0 :             av_log(s, AV_LOG_TRACE, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
     602           0 :             if (fill_header) {
     603           0 :                 st[NSV_ST_AUDIO]->need_parsing = AVSTREAM_PARSE_NONE; /* we know everything */
     604           0 :                 if (bps != 16) {
     605           0 :                     av_log(s, AV_LOG_TRACE, "NSV AUDIO bit/sample != 16 (%d)!!!\n", bps);
     606             :                 }
     607           0 :                 bps /= channels; // ???
     608           0 :                 if (bps == 8)
     609           0 :                     st[NSV_ST_AUDIO]->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
     610           0 :                 samplerate /= 4;/* UGH ??? XXX */
     611           0 :                 channels = 1;
     612           0 :                 st[NSV_ST_AUDIO]->codecpar->channels = channels;
     613           0 :                 st[NSV_ST_AUDIO]->codecpar->sample_rate = samplerate;
     614           0 :                 av_log(s, AV_LOG_TRACE, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
     615             :             }
     616             :         }
     617          88 :         if ((ret = av_get_packet(pb, pkt, asize)) < 0)
     618           0 :             return ret;
     619          88 :         pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
     620          88 :         pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
     621          88 :         if( nsv->state == NSV_HAS_READ_NSVS && st[NSV_ST_VIDEO] ) {
     622             :             /* on a nsvs frame we have new information on a/v sync */
     623           4 :             pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1);
     624           4 :             pkt->dts *= (int64_t)1000        * nsv->framerate.den;
     625           4 :             pkt->dts += (int64_t)nsv->avsync * nsv->framerate.num;
     626           4 :             av_log(s, AV_LOG_TRACE, "NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts);
     627             :         }
     628          88 :         nst->frame_offset++;
     629             :     }
     630             : 
     631          92 :     nsv->state = NSV_UNSYNC;
     632          92 :     return 0;
     633             : }
     634             : 
     635             : 
     636         147 : static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
     637             : {
     638         147 :     NSVContext *nsv = s->priv_data;
     639         147 :     int i, err = 0;
     640             : 
     641             :     /* in case we don't already have something to eat ... */
     642         147 :     if (!nsv->ahead[0].data && !nsv->ahead[1].data)
     643          91 :         err = nsv_read_chunk(s, 0);
     644         147 :     if (err < 0)
     645           0 :         return err;
     646             : 
     647             :     /* now pick one of the plates */
     648         234 :     for (i = 0; i < 2; i++) {
     649         234 :         if (nsv->ahead[i].data) {
     650             :             /* avoid the cost of new_packet + memcpy(->data) */
     651         147 :             memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket));
     652         147 :             nsv->ahead[i].data = NULL; /* we ate that one */
     653         147 :             return pkt->size;
     654             :         }
     655             :     }
     656             : 
     657             :     /* this restaurant is not provisioned :^] */
     658           0 :     return -1;
     659             : }
     660             : 
     661           0 : static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
     662             : {
     663           0 :     NSVContext *nsv = s->priv_data;
     664           0 :     AVStream *st = s->streams[stream_index];
     665           0 :     NSVStream *nst = st->priv_data;
     666             :     int index;
     667             : 
     668           0 :     index = av_index_search_timestamp(st, timestamp, flags);
     669           0 :     if(index < 0)
     670           0 :         return -1;
     671             : 
     672           0 :     if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
     673           0 :         return -1;
     674             : 
     675           0 :     nst->frame_offset = st->index_entries[index].timestamp;
     676           0 :     nsv->state = NSV_UNSYNC;
     677           0 :     return 0;
     678             : }
     679             : 
     680           1 : static int nsv_read_close(AVFormatContext *s)
     681             : {
     682           1 :     NSVContext *nsv = s->priv_data;
     683             : 
     684           1 :     av_freep(&nsv->nsvs_file_offset);
     685           1 :     av_freep(&nsv->nsvs_timestamps);
     686           1 :     if (nsv->ahead[0].data)
     687           0 :         av_packet_unref(&nsv->ahead[0]);
     688           1 :     if (nsv->ahead[1].data)
     689           1 :         av_packet_unref(&nsv->ahead[1]);
     690           1 :     return 0;
     691             : }
     692             : 
     693        6130 : static int nsv_probe(AVProbeData *p)
     694             : {
     695        6130 :     int i, score = 0;
     696             : 
     697             :     /* check file header */
     698             :     /* streamed files might not have any header */
     699        6131 :     if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
     700           2 :         p->buf[2] == 'V' && (p->buf[3] == 'f' || p->buf[3] == 's'))
     701           1 :         return AVPROBE_SCORE_MAX;
     702             :     /* XXX: do streamed files always start at chunk boundary ?? */
     703             :     /* or do we need to search NSVs in the byte stream ? */
     704             :     /* seems the servers don't bother starting clean chunks... */
     705             :     /* sometimes even the first header is at 9KB or something :^) */
     706   128254230 :     for (i = 1; i < p->buf_size - 3; i++) {
     707   128248101 :         if (AV_RL32(p->buf + i) == AV_RL32("NSVs")) {
     708             :             /* Get the chunk size and check if at the end we are getting 0xBEEF */
     709           0 :             int vsize = AV_RL24(p->buf+i+19) >> 4;
     710           0 :             int asize = AV_RL16(p->buf+i+22);
     711           0 :             int offset = i + 23 + asize + vsize + 1;
     712           0 :             if (offset <= p->buf_size - 2 && AV_RL16(p->buf + offset) == 0xBEEF)
     713           0 :                 return 4*AVPROBE_SCORE_MAX/5;
     714           0 :             score = AVPROBE_SCORE_MAX/5;
     715             :         }
     716             :     }
     717             :     /* so we'll have more luck on extension... */
     718        6129 :     if (av_match_ext(p->filename, "nsv"))
     719           0 :         return AVPROBE_SCORE_EXTENSION;
     720             :     /* FIXME: add mime-type check */
     721        6129 :     return score;
     722             : }
     723             : 
     724             : AVInputFormat ff_nsv_demuxer = {
     725             :     .name           = "nsv",
     726             :     .long_name      = NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"),
     727             :     .priv_data_size = sizeof(NSVContext),
     728             :     .read_probe     = nsv_probe,
     729             :     .read_header    = nsv_read_header,
     730             :     .read_packet    = nsv_read_packet,
     731             :     .read_close     = nsv_read_close,
     732             :     .read_seek      = nsv_read_seek,
     733             : };

Generated by: LCOV version 1.13