LCOV - code coverage report
Current view: top level - libavformat - omadec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 93 327 28.4 %
Date: 2017-12-17 04:34:43 Functions: 5 12 41.7 %

          Line data    Source code
       1             : /*
       2             :  * Sony OpenMG (OMA) demuxer
       3             :  *
       4             :  * Copyright (c) 2008, 2013 Maxim Poliakovski
       5             :  *               2008 Benjamin Larsson
       6             :  *               2011 David Goldwich
       7             :  *
       8             :  * This file is part of FFmpeg.
       9             :  *
      10             :  * FFmpeg is free software; you can redistribute it and/or
      11             :  * modify it under the terms of the GNU Lesser General Public
      12             :  * License as published by the Free Software Foundation; either
      13             :  * version 2.1 of the License, or (at your option) any later version.
      14             :  *
      15             :  * FFmpeg is distributed in the hope that it will be useful,
      16             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      17             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      18             :  * Lesser General Public License for more details.
      19             :  *
      20             :  * You should have received a copy of the GNU Lesser General Public
      21             :  * License along with FFmpeg; if not, write to the Free Software
      22             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      23             :  */
      24             : 
      25             : /**
      26             :  * @file
      27             :  * This is a demuxer for Sony OpenMG Music files
      28             :  *
      29             :  * Known file extensions: ".oma", "aa3"
      30             :  * The format of such files consists of three parts:
      31             :  * - "ea3" header carrying overall info and metadata. Except for starting with
      32             :  *   "ea" instead of "ID", it's an ID3v2 header.
      33             :  * - "EA3" header is a Sony-specific header containing information about
      34             :  *   the OpenMG file: codec type (usually ATRAC, can also be MP3 or WMA),
      35             :  *   codec specific info (packet size, sample rate, channels and so on)
      36             :  *   and DRM related info (file encryption, content id).
      37             :  * - Sound data organized in packets follow the EA3 header
      38             :  *   (can be encrypted using the Sony DRM!).
      39             :  *
      40             :  * Supported decoders: ATRAC3, ATRAC3+, MP3, LPCM
      41             :  */
      42             : 
      43             : #include <inttypes.h>
      44             : 
      45             : #include "libavutil/channel_layout.h"
      46             : #include "avformat.h"
      47             : #include "internal.h"
      48             : #include "libavutil/intreadwrite.h"
      49             : #include "libavutil/des.h"
      50             : #include "libavutil/mathematics.h"
      51             : #include "oma.h"
      52             : #include "pcm.h"
      53             : #include "id3v2.h"
      54             : 
      55             : 
      56             : static const uint64_t leaf_table[] = {
      57             :     0xd79e8283acea4620, 0x7a9762f445afd0d8,
      58             :     0x354d60a60b8c79f1, 0x584e1cde00b07aee,
      59             :     0x1573cd93da7df623, 0x47f98d79620dd535
      60             : };
      61             : 
      62             : typedef struct OMAContext {
      63             :     uint64_t content_start;
      64             :     int encrypted;
      65             :     uint16_t k_size;
      66             :     uint16_t e_size;
      67             :     uint16_t i_size;
      68             :     uint16_t s_size;
      69             :     uint32_t rid;
      70             :     uint8_t r_val[24];
      71             :     uint8_t n_val[24];
      72             :     uint8_t m_val[8];
      73             :     uint8_t s_val[8];
      74             :     uint8_t sm_val[8];
      75             :     uint8_t e_val[8];
      76             :     uint8_t iv[8];
      77             :     struct AVDES *av_des;
      78             : 
      79             :     int (*read_packet)(AVFormatContext *s, AVPacket *pkt);
      80             : } OMAContext;
      81             : 
      82           0 : static void hex_log(AVFormatContext *s, int level,
      83             :                     const char *name, const uint8_t *value, int len)
      84             : {
      85             :     char buf[33];
      86           0 :     len = FFMIN(len, 16);
      87           0 :     if (av_log_get_level() < level)
      88           0 :         return;
      89           0 :     ff_data_to_hex(buf, value, len, 1);
      90           0 :     buf[len << 1] = '\0';
      91           0 :     av_log(s, level, "%s: %s\n", name, buf);
      92             : }
      93             : 
      94           0 : static int kset(AVFormatContext *s, const uint8_t *r_val, const uint8_t *n_val,
      95             :                 int len)
      96             : {
      97           0 :     OMAContext *oc = s->priv_data;
      98             : 
      99           0 :     if (!r_val && !n_val)
     100           0 :         return -1;
     101             : 
     102           0 :     len = FFMIN(len, 16);
     103             : 
     104             :     /* use first 64 bits in the third round again */
     105           0 :     if (r_val) {
     106           0 :         if (r_val != oc->r_val) {
     107           0 :             memset(oc->r_val, 0, 24);
     108           0 :             memcpy(oc->r_val, r_val, len);
     109             :         }
     110           0 :         memcpy(&oc->r_val[16], r_val, 8);
     111             :     }
     112           0 :     if (n_val) {
     113           0 :         if (n_val != oc->n_val) {
     114           0 :             memset(oc->n_val, 0, 24);
     115           0 :             memcpy(oc->n_val, n_val, len);
     116             :         }
     117           0 :         memcpy(&oc->n_val[16], n_val, 8);
     118             :     }
     119             : 
     120           0 :     return 0;
     121             : }
     122             : 
     123             : #define OMA_RPROBE_M_VAL 48 + 1
     124             : 
     125           0 : static int rprobe(AVFormatContext *s, uint8_t *enc_header, unsigned size,
     126             :                   const uint8_t *r_val)
     127             : {
     128           0 :     OMAContext *oc = s->priv_data;
     129             :     unsigned int pos;
     130             :     struct AVDES *av_des;
     131             : 
     132           0 :     if (!enc_header || !r_val ||
     133           0 :         size < OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size + oc->i_size ||
     134             :         size < OMA_RPROBE_M_VAL)
     135           0 :         return -1;
     136             : 
     137           0 :     av_des = av_des_alloc();
     138           0 :     if (!av_des)
     139           0 :         return AVERROR(ENOMEM);
     140             : 
     141             :     /* m_val */
     142           0 :     av_des_init(av_des, r_val, 192, 1);
     143           0 :     av_des_crypt(av_des, oc->m_val, &enc_header[48], 1, NULL, 1);
     144             : 
     145             :     /* s_val */
     146           0 :     av_des_init(av_des, oc->m_val, 64, 0);
     147           0 :     av_des_crypt(av_des, oc->s_val, NULL, 1, NULL, 0);
     148             : 
     149             :     /* sm_val */
     150           0 :     pos = OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size;
     151           0 :     av_des_init(av_des, oc->s_val, 64, 0);
     152           0 :     av_des_mac(av_des, oc->sm_val, &enc_header[pos], (oc->i_size >> 3));
     153             : 
     154           0 :     pos += oc->i_size;
     155             : 
     156           0 :     av_free(av_des);
     157             : 
     158           0 :     return memcmp(&enc_header[pos], oc->sm_val, 8) ? -1 : 0;
     159             : }
     160             : 
     161           0 : static int nprobe(AVFormatContext *s, uint8_t *enc_header, unsigned size,
     162             :                   const uint8_t *n_val)
     163             : {
     164           0 :     OMAContext *oc = s->priv_data;
     165             :     uint64_t pos;
     166             :     uint32_t taglen, datalen;
     167             :     struct AVDES *av_des;
     168             : 
     169           0 :     if (!enc_header || !n_val ||
     170           0 :         size < OMA_ENC_HEADER_SIZE + oc->k_size + 4)
     171           0 :         return -1;
     172             : 
     173           0 :     pos = OMA_ENC_HEADER_SIZE + oc->k_size;
     174           0 :     if (!memcmp(&enc_header[pos], "EKB ", 4))
     175           0 :         pos += 32;
     176             : 
     177           0 :     if (size < pos + 44)
     178           0 :         return -1;
     179             : 
     180           0 :     if (AV_RB32(&enc_header[pos]) != oc->rid)
     181           0 :         av_log(s, AV_LOG_DEBUG, "Mismatching RID\n");
     182             : 
     183           0 :     taglen  = AV_RB32(&enc_header[pos + 32]);
     184           0 :     datalen = AV_RB32(&enc_header[pos + 36]) >> 4;
     185             : 
     186           0 :     pos += 44LL + taglen;
     187             : 
     188           0 :     if (pos + (((uint64_t)datalen) << 4) > size)
     189           0 :         return -1;
     190             : 
     191           0 :     av_des = av_des_alloc();
     192           0 :     if (!av_des)
     193           0 :         return AVERROR(ENOMEM);
     194             : 
     195           0 :     av_des_init(av_des, n_val, 192, 1);
     196           0 :     while (datalen-- > 0) {
     197           0 :         av_des_crypt(av_des, oc->r_val, &enc_header[pos], 2, NULL, 1);
     198           0 :         kset(s, oc->r_val, NULL, 16);
     199           0 :         if (!rprobe(s, enc_header, size, oc->r_val)) {
     200           0 :             av_free(av_des);
     201           0 :             return 0;
     202             :         }
     203           0 :         pos += 16;
     204             :     }
     205             : 
     206           0 :     av_free(av_des);
     207           0 :     return -1;
     208             : }
     209             : 
     210           0 : static int decrypt_init(AVFormatContext *s, ID3v2ExtraMeta *em, uint8_t *header)
     211             : {
     212           0 :     OMAContext *oc = s->priv_data;
     213           0 :     ID3v2ExtraMetaGEOB *geob = NULL;
     214             :     uint8_t *gdata;
     215             : 
     216           0 :     oc->encrypted = 1;
     217           0 :     av_log(s, AV_LOG_INFO, "File is encrypted\n");
     218             : 
     219             :     /* find GEOB metadata */
     220           0 :     while (em) {
     221           0 :         if (!strcmp(em->tag, "GEOB") &&
     222           0 :             (geob = em->data) &&
     223           0 :             (!strcmp(geob->description, "OMG_LSI") ||
     224           0 :              !strcmp(geob->description, "OMG_BKLSI"))) {
     225             :             break;
     226             :         }
     227           0 :         em = em->next;
     228             :     }
     229           0 :     if (!em) {
     230           0 :         av_log(s, AV_LOG_ERROR, "No encryption header found\n");
     231           0 :         return AVERROR_INVALIDDATA;
     232             :     }
     233             : 
     234           0 :     if (geob->datasize < 64) {
     235           0 :         av_log(s, AV_LOG_ERROR,
     236             :                "Invalid GEOB data size: %"PRIu32"\n", geob->datasize);
     237           0 :         return AVERROR_INVALIDDATA;
     238             :     }
     239             : 
     240           0 :     gdata = geob->data;
     241             : 
     242           0 :     if (AV_RB16(gdata) != 1)
     243           0 :         av_log(s, AV_LOG_WARNING, "Unknown version in encryption header\n");
     244             : 
     245           0 :     oc->k_size = AV_RB16(&gdata[2]);
     246           0 :     oc->e_size = AV_RB16(&gdata[4]);
     247           0 :     oc->i_size = AV_RB16(&gdata[6]);
     248           0 :     oc->s_size = AV_RB16(&gdata[8]);
     249             : 
     250           0 :     if (memcmp(&gdata[OMA_ENC_HEADER_SIZE], "KEYRING     ", 12)) {
     251           0 :         av_log(s, AV_LOG_ERROR, "Invalid encryption header\n");
     252           0 :         return AVERROR_INVALIDDATA;
     253             :     }
     254           0 :     if (OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size + oc->i_size + 8 > geob->datasize ||
     255           0 :         OMA_ENC_HEADER_SIZE + 48 > geob->datasize) {
     256           0 :         av_log(s, AV_LOG_ERROR, "Too little GEOB data\n");
     257           0 :         return AVERROR_INVALIDDATA;
     258             :     }
     259           0 :     oc->rid = AV_RB32(&gdata[OMA_ENC_HEADER_SIZE + 28]);
     260           0 :     av_log(s, AV_LOG_DEBUG, "RID: %.8"PRIx32"\n", oc->rid);
     261             : 
     262           0 :     memcpy(oc->iv, &header[0x58], 8);
     263           0 :     hex_log(s, AV_LOG_DEBUG, "IV", oc->iv, 8);
     264             : 
     265           0 :     hex_log(s, AV_LOG_DEBUG, "CBC-MAC",
     266           0 :             &gdata[OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size + oc->i_size],
     267             :             8);
     268             : 
     269           0 :     if (s->keylen > 0) {
     270           0 :         kset(s, s->key, s->key, s->keylen);
     271             :     }
     272           0 :     if (!memcmp(oc->r_val, (const uint8_t[8]){0}, 8) ||
     273           0 :         rprobe(s, gdata, geob->datasize, oc->r_val) < 0 &&
     274           0 :         nprobe(s, gdata, geob->datasize, oc->n_val) < 0) {
     275             :         int i;
     276           0 :         for (i = 0; i < FF_ARRAY_ELEMS(leaf_table); i += 2) {
     277             :             uint8_t buf[16];
     278           0 :             AV_WL64(buf,     leaf_table[i]);
     279           0 :             AV_WL64(&buf[8], leaf_table[i + 1]);
     280           0 :             kset(s, buf, buf, 16);
     281           0 :             if (!rprobe(s, gdata, geob->datasize, oc->r_val) ||
     282           0 :                 !nprobe(s, gdata, geob->datasize, oc->n_val))
     283             :                 break;
     284             :         }
     285           0 :         if (i >= FF_ARRAY_ELEMS(leaf_table)) {
     286           0 :             av_log(s, AV_LOG_ERROR, "Invalid key\n");
     287           0 :             return AVERROR_INVALIDDATA;
     288             :         }
     289             :     }
     290             : 
     291           0 :     oc->av_des = av_des_alloc();
     292           0 :     if (!oc->av_des)
     293           0 :         return AVERROR(ENOMEM);
     294             : 
     295             :     /* e_val */
     296           0 :     av_des_init(oc->av_des, oc->m_val, 64, 0);
     297           0 :     av_des_crypt(oc->av_des, oc->e_val,
     298           0 :                  &gdata[OMA_ENC_HEADER_SIZE + 40], 1, NULL, 0);
     299           0 :     hex_log(s, AV_LOG_DEBUG, "EK", oc->e_val, 8);
     300             : 
     301             :     /* init e_val */
     302           0 :     av_des_init(oc->av_des, oc->e_val, 64, 1);
     303             : 
     304           0 :     return 0;
     305             : }
     306             : 
     307        2174 : static int read_packet(AVFormatContext *s, AVPacket *pkt)
     308             : {
     309        2174 :     OMAContext *oc  = s->priv_data;
     310        2174 :     AVStream *st    = s->streams[0];
     311        2174 :     int packet_size = st->codecpar->block_align;
     312        2174 :     int byte_rate   = st->codecpar->bit_rate >> 3;
     313        2174 :     int64_t pos     = avio_tell(s->pb);
     314        2174 :     int ret         = av_get_packet(s->pb, pkt, packet_size);
     315             : 
     316        2174 :     if (ret < packet_size)
     317           5 :         pkt->flags |= AV_PKT_FLAG_CORRUPT;
     318             : 
     319        2174 :     if (ret < 0)
     320           3 :         return ret;
     321        2171 :     if (!ret)
     322           0 :         return AVERROR_EOF;
     323             : 
     324        2171 :     pkt->stream_index = 0;
     325             : 
     326        2171 :     if (pos >= oc->content_start && byte_rate > 0) {
     327        2171 :         pkt->pts =
     328        4342 :         pkt->dts = av_rescale(pos - oc->content_start, st->time_base.den,
     329        2171 :                               byte_rate * (int64_t)st->time_base.num);
     330             :     }
     331             : 
     332        2171 :     if (oc->encrypted) {
     333             :         /* previous unencrypted block saved in IV for
     334             :          * the next packet (CBC mode) */
     335           0 :         if (ret == packet_size)
     336           0 :             av_des_crypt(oc->av_des, pkt->data, pkt->data,
     337           0 :                          (packet_size >> 3), oc->iv, 1);
     338             :         else
     339           0 :             memset(oc->iv, 0, 8);
     340             :     }
     341             : 
     342        2171 :     return ret;
     343             : }
     344             : 
     345           0 : static int aal_read_packet(AVFormatContext *s, AVPacket *pkt)
     346             : {
     347           0 :     int64_t pos = avio_tell(s->pb);
     348             :     int ret, pts;
     349             :     int packet_size;
     350             :     unsigned tag;
     351             : 
     352           0 :     if (avio_feof(s->pb))
     353           0 :         return AVERROR_EOF;
     354             : 
     355           0 :     tag = avio_rb24(s->pb);
     356           0 :     if (tag == 0)
     357           0 :         return AVERROR_EOF;
     358           0 :     else if (tag != MKBETAG(0,'B','L','K'))
     359           0 :         return AVERROR_INVALIDDATA;
     360             : 
     361           0 :     avio_skip(s->pb, 1);
     362           0 :     packet_size = avio_rb16(s->pb);
     363           0 :     avio_skip(s->pb, 2);
     364           0 :     pts = avio_rb32(s->pb);
     365           0 :     avio_skip(s->pb, 12);
     366           0 :     ret = av_get_packet(s->pb, pkt, packet_size);
     367           0 :     if (ret < packet_size)
     368           0 :         pkt->flags |= AV_PKT_FLAG_CORRUPT;
     369             : 
     370           0 :     if (ret < 0)
     371           0 :         return ret;
     372           0 :     if (!ret)
     373           0 :         return AVERROR_EOF;
     374             : 
     375           0 :     pkt->stream_index = 0;
     376           0 :     pkt->pos = pos;
     377           0 :     if (s->streams[0]->codecpar->codec_id == AV_CODEC_ID_ATRAC3AL) {
     378           0 :         pkt->duration = 1024;
     379           0 :         pkt->pts = pts * 1024LL;
     380             :     } else {
     381           0 :         pkt->duration = 2048;
     382           0 :         pkt->pts = pts * 2048LL;
     383             :     }
     384             : 
     385           0 :     return ret;
     386             : }
     387             : 
     388           3 : static int oma_read_header(AVFormatContext *s)
     389             : {
     390             :     int     ret, framesize, jsflag, samplerate;
     391             :     uint32_t codec_params, channel_id;
     392             :     int16_t eid;
     393             :     uint8_t buf[EA3_HEADER_SIZE];
     394             :     uint8_t *edata;
     395             :     AVStream *st;
     396           3 :     ID3v2ExtraMeta *extra_meta = NULL;
     397           3 :     OMAContext *oc = s->priv_data;
     398             : 
     399           3 :     ff_id3v2_read(s, ID3v2_EA3_MAGIC, &extra_meta, 0);
     400           3 :     if ((ret = ff_id3v2_parse_chapters(s, &extra_meta)) < 0) {
     401           0 :         ff_id3v2_free_extra_meta(&extra_meta);
     402           0 :         return ret;
     403             :     }
     404             : 
     405           3 :     ret = avio_read(s->pb, buf, EA3_HEADER_SIZE);
     406           3 :     if (ret < EA3_HEADER_SIZE)
     407           0 :         return -1;
     408             : 
     409           6 :     if (memcmp(buf, ((const uint8_t[]){'E', 'A', '3'}), 3) ||
     410           6 :         buf[4] != 0 || buf[5] != EA3_HEADER_SIZE) {
     411           0 :         av_log(s, AV_LOG_ERROR, "Couldn't find the EA3 header !\n");
     412           0 :         return AVERROR_INVALIDDATA;
     413             :     }
     414             : 
     415           3 :     oc->content_start = avio_tell(s->pb);
     416             : 
     417             :     /* encrypted file */
     418           3 :     eid = AV_RB16(&buf[6]);
     419           3 :     if (eid != -1 && eid != -128 && decrypt_init(s, extra_meta, buf) < 0) {
     420           0 :         ff_id3v2_free_extra_meta(&extra_meta);
     421           0 :         return -1;
     422             :     }
     423             : 
     424           3 :     ff_id3v2_free_extra_meta(&extra_meta);
     425             : 
     426           3 :     codec_params = AV_RB24(&buf[33]);
     427             : 
     428           3 :     st = avformat_new_stream(s, NULL);
     429           3 :     if (!st)
     430           0 :         return AVERROR(ENOMEM);
     431             : 
     432           3 :     st->start_time = 0;
     433           3 :     st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
     434           3 :     st->codecpar->codec_tag  = buf[32];
     435           3 :     st->codecpar->codec_id   = ff_codec_get_id(ff_oma_codec_tags,
     436           3 :                                                st->codecpar->codec_tag);
     437             : 
     438           3 :     oc->read_packet = read_packet;
     439             : 
     440           3 :     switch (buf[32]) {
     441           1 :     case OMA_CODECID_ATRAC3:
     442           1 :         samplerate = ff_oma_srate_tab[(codec_params >> 13) & 7] * 100;
     443           1 :         if (!samplerate) {
     444           0 :             av_log(s, AV_LOG_ERROR, "Unsupported sample rate\n");
     445           0 :             return AVERROR_INVALIDDATA;
     446             :         }
     447           1 :         if (samplerate != 44100)
     448           0 :             avpriv_request_sample(s, "Sample rate %d", samplerate);
     449             : 
     450           1 :         framesize = (codec_params & 0x3FF) * 8;
     451             : 
     452             :         /* get stereo coding mode, 1 for joint-stereo */
     453           1 :         jsflag = (codec_params >> 17) & 1;
     454             : 
     455           1 :         st->codecpar->channels    = 2;
     456           1 :         st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
     457           1 :         st->codecpar->sample_rate = samplerate;
     458           1 :         st->codecpar->bit_rate    = st->codecpar->sample_rate * framesize / (1024 / 8);
     459             : 
     460             :         /* fake the ATRAC3 extradata
     461             :          * (wav format, makes stream copy to wav work) */
     462           1 :         if (ff_alloc_extradata(st->codecpar, 14))
     463           0 :             return AVERROR(ENOMEM);
     464             : 
     465           1 :         edata = st->codecpar->extradata;
     466           1 :         AV_WL16(&edata[0],  1);             // always 1
     467           1 :         AV_WL32(&edata[2],  samplerate);    // samples rate
     468           1 :         AV_WL16(&edata[6],  jsflag);        // coding mode
     469           1 :         AV_WL16(&edata[8],  jsflag);        // coding mode
     470           1 :         AV_WL16(&edata[10], 1);             // always 1
     471             :         // AV_WL16(&edata[12], 0);          // always 0
     472             : 
     473           1 :         avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
     474           1 :         break;
     475           2 :     case OMA_CODECID_ATRAC3P:
     476           2 :         channel_id = (codec_params >> 10) & 7;
     477           2 :         if (!channel_id) {
     478           0 :             av_log(s, AV_LOG_ERROR,
     479             :                    "Invalid ATRAC-X channel id: %"PRIu32"\n", channel_id);
     480           0 :             return AVERROR_INVALIDDATA;
     481             :         }
     482           2 :         st->codecpar->channel_layout = ff_oma_chid_to_native_layout[channel_id - 1];
     483           2 :         st->codecpar->channels       = ff_oma_chid_to_num_channels[channel_id - 1];
     484           2 :         framesize = ((codec_params & 0x3FF) * 8) + 8;
     485           2 :         samplerate = ff_oma_srate_tab[(codec_params >> 13) & 7] * 100;
     486           2 :         if (!samplerate) {
     487           0 :             av_log(s, AV_LOG_ERROR, "Unsupported sample rate\n");
     488           0 :             return AVERROR_INVALIDDATA;
     489             :         }
     490           2 :         st->codecpar->sample_rate = samplerate;
     491           2 :         st->codecpar->bit_rate    = samplerate * framesize / (2048 / 8);
     492           2 :         avpriv_set_pts_info(st, 64, 1, samplerate);
     493           2 :         break;
     494           0 :     case OMA_CODECID_MP3:
     495           0 :         st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
     496           0 :         framesize = 1024;
     497           0 :         break;
     498           0 :     case OMA_CODECID_LPCM:
     499             :         /* PCM 44.1 kHz 16 bit stereo big-endian */
     500           0 :         st->codecpar->channels = 2;
     501           0 :         st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
     502           0 :         st->codecpar->sample_rate = 44100;
     503           0 :         framesize = 1024;
     504             :         /* bit rate = sample rate x PCM block align (= 4) x 8 */
     505           0 :         st->codecpar->bit_rate = st->codecpar->sample_rate * 32;
     506           0 :         st->codecpar->bits_per_coded_sample =
     507           0 :             av_get_bits_per_sample(st->codecpar->codec_id);
     508           0 :         avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
     509           0 :         break;
     510           0 :     case OMA_CODECID_ATRAC3AL:
     511           0 :         st->codecpar->channels    = 2;
     512           0 :         st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
     513           0 :         st->codecpar->sample_rate = 44100;
     514           0 :         avpriv_set_pts_info(st, 64, 1, 44100);
     515           0 :         oc->read_packet = aal_read_packet;
     516           0 :         framesize = 4096;
     517           0 :         break;
     518           0 :     case OMA_CODECID_ATRAC3PAL:
     519           0 :         st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
     520           0 :         st->codecpar->channels       = 2;
     521           0 :         st->codecpar->sample_rate = 44100;
     522           0 :         avpriv_set_pts_info(st, 64, 1, 44100);
     523           0 :         oc->read_packet = aal_read_packet;
     524           0 :         framesize = 4096;
     525           0 :         break;
     526           0 :     default:
     527           0 :         av_log(s, AV_LOG_ERROR, "Unsupported codec %d!\n", buf[32]);
     528           0 :         return AVERROR(ENOSYS);
     529             :     }
     530             : 
     531           3 :     st->codecpar->block_align = framesize;
     532             : 
     533           3 :     return 0;
     534             : }
     535             : 
     536        2174 : static int oma_read_packet(AVFormatContext *s, AVPacket *pkt)
     537             : {
     538        2174 :     OMAContext *oc  = s->priv_data;
     539        2174 :     return oc->read_packet(s, pkt);
     540             : }
     541             : 
     542        6130 : static int oma_read_probe(AVProbeData *p)
     543             : {
     544        6130 :     const uint8_t *buf = p->buf;
     545        6130 :     unsigned tag_len = 0;
     546             : 
     547        6130 :     if (p->buf_size >= ID3v2_HEADER_SIZE && ff_id3v2_match(buf, ID3v2_EA3_MAGIC))
     548           3 :         tag_len = ff_id3v2_tag_len(buf);
     549             : 
     550             :     /* This check cannot overflow as tag_len has at most 28 bits */
     551        6130 :     if (p->buf_size < tag_len + 5)
     552             :         /* EA3 header comes late, might be outside of the probe buffer */
     553           1 :         return tag_len ? AVPROBE_SCORE_EXTENSION/2 : 0;
     554             : 
     555        6129 :     buf += tag_len;
     556             : 
     557        6129 :     if (!memcmp(buf, "EA3", 3) && !buf[4] && buf[5] == EA3_HEADER_SIZE)
     558           3 :         return AVPROBE_SCORE_MAX;
     559             :     else
     560        6126 :         return 0;
     561             : }
     562             : 
     563           0 : static int oma_read_seek(struct AVFormatContext *s,
     564             :                          int stream_index, int64_t timestamp, int flags)
     565             : {
     566           0 :     OMAContext *oc = s->priv_data;
     567           0 :     AVStream *st = s->streams[0];
     568             :     int64_t err;
     569             : 
     570           0 :     if (st->codecpar->codec_id == AV_CODEC_ID_ATRAC3PAL ||
     571           0 :         st->codecpar->codec_id == AV_CODEC_ID_ATRAC3AL)
     572           0 :         return -1;
     573             : 
     574           0 :     err = ff_pcm_read_seek(s, stream_index, timestamp, flags);
     575           0 :     if (!oc->encrypted)
     576           0 :         return err;
     577             : 
     578             :     /* readjust IV for CBC */
     579           0 :     if (err || avio_tell(s->pb) < oc->content_start)
     580             :         goto wipe;
     581           0 :     if ((err = avio_seek(s->pb, -8, SEEK_CUR)) < 0)
     582           0 :         goto wipe;
     583           0 :     if ((err = avio_read(s->pb, oc->iv, 8)) < 8) {
     584           0 :         if (err >= 0)
     585           0 :             err = AVERROR_EOF;
     586           0 :         goto wipe;
     587             :     }
     588             : 
     589           0 :     return 0;
     590           0 : wipe:
     591           0 :     memset(oc->iv, 0, 8);
     592           0 :     return err;
     593             : }
     594             : 
     595           3 : static int oma_read_close(AVFormatContext *s)
     596             : {
     597           3 :     OMAContext *oc = s->priv_data;
     598           3 :     av_free(oc->av_des);
     599           3 :     return 0;
     600             : }
     601             : 
     602             : AVInputFormat ff_oma_demuxer = {
     603             :     .name           = "oma",
     604             :     .long_name      = NULL_IF_CONFIG_SMALL("Sony OpenMG audio"),
     605             :     .priv_data_size = sizeof(OMAContext),
     606             :     .read_probe     = oma_read_probe,
     607             :     .read_header    = oma_read_header,
     608             :     .read_packet    = oma_read_packet,
     609             :     .read_seek      = oma_read_seek,
     610             :     .read_close     = oma_read_close,
     611             :     .flags          = AVFMT_GENERIC_INDEX,
     612             :     .extensions     = "oma,omg,aa3",
     613             :     .codec_tag      = (const AVCodecTag* const []){ff_oma_codec_tags, 0},
     614             : };

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