FFmpeg: libavformat/electronicarts.c Source File

00001 /* Electronic Arts Multimedia File Demuxer
00002  * Copyright (c) 2004  The ffmpeg Project
00003  * Copyright (c) 2006-2008 Peter Ross
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00028 #include "libavutil/intreadwrite.h"
00029 #include "avformat.h"
00030 #include "internal.h"
00031 
00032 #define SCHl_TAG MKTAG('S', 'C', 'H', 'l')
00033 #define SEAD_TAG MKTAG('S', 'E', 'A', 'D')    /* Sxxx header */
00034 #define SNDC_TAG MKTAG('S', 'N', 'D', 'C')    /* Sxxx data */
00035 #define SEND_TAG MKTAG('S', 'E', 'N', 'D')    /* Sxxx end */
00036 #define SHEN_TAG MKTAG('S', 'H', 'E', 'N')    /* SxEN header */
00037 #define SDEN_TAG MKTAG('S', 'D', 'E', 'N')    /* SxEN data */
00038 #define SEEN_TAG MKTAG('S', 'E', 'E', 'N')    /* SxEN end */
00039 #define ISNh_TAG MKTAG('1', 'S', 'N', 'h')    /* 1SNx header */
00040 #define EACS_TAG MKTAG('E', 'A', 'C', 'S')
00041 #define ISNd_TAG MKTAG('1', 'S', 'N', 'd')    /* 1SNx data */
00042 #define ISNe_TAG MKTAG('1', 'S', 'N', 'e')    /* 1SNx end */
00043 #define PT00_TAG MKTAG('P', 'T', 0x0, 0x0)
00044 #define GSTR_TAG MKTAG('G', 'S', 'T', 'R')
00045 #define SCDl_TAG MKTAG('S', 'C', 'D', 'l')
00046 #define SCEl_TAG MKTAG('S', 'C', 'E', 'l')
00047 #define kVGT_TAG MKTAG('k', 'V', 'G', 'T')    /* TGV i-frame */
00048 #define fVGT_TAG MKTAG('f', 'V', 'G', 'T')    /* TGV p-frame */
00049 #define mTCD_TAG MKTAG('m', 'T', 'C', 'D')    /* MDEC */
00050 #define MADk_TAG MKTAG('M', 'A', 'D', 'k')    /* MAD i-frame */
00051 #define MADm_TAG MKTAG('M', 'A', 'D', 'm')    /* MAD p-frame */
00052 #define MADe_TAG MKTAG('M', 'A', 'D', 'e')    /* MAD lqp-frame */
00053 #define MPCh_TAG MKTAG('M', 'P', 'C', 'h')    /* MPEG2 */
00054 #define TGQs_TAG MKTAG('T', 'G', 'Q', 's')    /* TGQ i-frame (appears in .TGQ files) */
00055 #define pQGT_TAG MKTAG('p', 'Q', 'G', 'T')    /* TGQ i-frame (appears in .UV files) */
00056 #define pIQT_TAG MKTAG('p', 'I', 'Q', 'T')    /* TQI/UV2 i-frame (.UV2/.WVE) */
00057 #define MVhd_TAG MKTAG('M', 'V', 'h', 'd')
00058 #define MV0K_TAG MKTAG('M', 'V', '0', 'K')
00059 #define MV0F_TAG MKTAG('M', 'V', '0', 'F')
00060 #define MVIh_TAG MKTAG('M', 'V', 'I', 'h')    /* CMV header */
00061 #define MVIf_TAG MKTAG('M', 'V', 'I', 'f')    /* CMV i-frame */
00062 
00063 typedef struct EaDemuxContext {
00064     int big_endian;
00065 
00066     enum AVCodecID video_codec;
00067     AVRational time_base;
00068     int width, height;
00069     int nb_frames;
00070     int video_stream_index;
00071 
00072     enum AVCodecID audio_codec;
00073     int audio_stream_index;
00074 
00075     int bytes;
00076     int sample_rate;
00077     int num_channels;
00078     int num_samples;
00079 } EaDemuxContext;
00080 
00081 static uint32_t read_arbitary(AVIOContext *pb) {
00082     uint8_t size, byte;
00083     int i;
00084     uint32_t word;
00085 
00086     size = avio_r8(pb);
00087 
00088     word = 0;
00089     for (i = 0; i < size; i++) {
00090         byte = avio_r8(pb);
00091         word <<= 8;
00092         word |= byte;
00093     }
00094 
00095     return word;
00096 }
00097 
00098 /*
00099  * Process PT/GSTR sound header
00100  * return 1 if success, 0 if invalid format, otherwise AVERROR_xxx
00101  */
00102 static int process_audio_header_elements(AVFormatContext *s)
00103 {
00104     int inHeader = 1;
00105     EaDemuxContext *ea = s->priv_data;
00106     AVIOContext *pb = s->pb;
00107     int compression_type = -1, revision = -1, revision2 = -1;
00108 
00109     ea->bytes = 2;
00110     ea->sample_rate = -1;
00111     ea->num_channels = 1;
00112 
00113     while (!url_feof(pb) && inHeader) {
00114         int inSubheader;
00115         uint8_t byte;
00116         byte = avio_r8(pb);
00117 
00118         switch (byte) {
00119         case 0xFD:
00120             av_log (s, AV_LOG_DEBUG, "entered audio subheader\n");
00121             inSubheader = 1;
00122             while (!url_feof(pb) && inSubheader) {
00123                 uint8_t subbyte;
00124                 subbyte = avio_r8(pb);
00125 
00126                 switch (subbyte) {
00127                 case 0x80:
00128                     revision = read_arbitary(pb);
00129                     av_log (s, AV_LOG_DEBUG, "revision (element 0x80) set to 0x%08x\n", revision);
00130                     break;
00131                 case 0x82:
00132                     ea->num_channels = read_arbitary(pb);
00133                     av_log (s, AV_LOG_DEBUG, "num_channels (element 0x82) set to 0x%08x\n", ea->num_channels);
00134                     break;
00135                 case 0x83:
00136                     compression_type = read_arbitary(pb);
00137                     av_log (s, AV_LOG_DEBUG, "compression_type (element 0x83) set to 0x%08x\n", compression_type);
00138                     break;
00139                 case 0x84:
00140                     ea->sample_rate = read_arbitary(pb);
00141                     av_log (s, AV_LOG_DEBUG, "sample_rate (element 0x84) set to %i\n", ea->sample_rate);
00142                     break;
00143                 case 0x85:
00144                     ea->num_samples = read_arbitary(pb);
00145                     av_log (s, AV_LOG_DEBUG, "num_samples (element 0x85) set to 0x%08x\n", ea->num_samples);
00146                     break;
00147                 case 0x8A:
00148                     av_log (s, AV_LOG_DEBUG, "element 0x%02x set to 0x%08x\n", subbyte, read_arbitary(pb));
00149                     av_log (s, AV_LOG_DEBUG, "exited audio subheader\n");
00150                     inSubheader = 0;
00151                     break;
00152                 case 0xA0:
00153                     revision2 = read_arbitary(pb);
00154                     av_log (s, AV_LOG_DEBUG, "revision2 (element 0xA0) set to 0x%08x\n", revision2);
00155                     break;
00156                 case 0xFF:
00157                     av_log (s, AV_LOG_DEBUG, "end of header block reached (within audio subheader)\n");
00158                     inSubheader = 0;
00159                     inHeader = 0;
00160                     break;
00161                 default:
00162                     av_log (s, AV_LOG_DEBUG, "element 0x%02x set to 0x%08x\n", subbyte, read_arbitary(pb));
00163                     break;
00164                 }
00165             }
00166             break;
00167         case 0xFF:
00168             av_log (s, AV_LOG_DEBUG, "end of header block reached\n");
00169             inHeader = 0;
00170             break;
00171         default:
00172             av_log (s, AV_LOG_DEBUG, "header element 0x%02x set to 0x%08x\n", byte, read_arbitary(pb));
00173             break;
00174         }
00175     }
00176 
00177     switch (compression_type) {
00178     case  0: ea->audio_codec = AV_CODEC_ID_PCM_S16LE; break;
00179     case  7: ea->audio_codec = AV_CODEC_ID_ADPCM_EA; break;
00180     case -1:
00181         switch (revision) {
00182         case  1: ea->audio_codec = AV_CODEC_ID_ADPCM_EA_R1; break;
00183         case  2: ea->audio_codec = AV_CODEC_ID_ADPCM_EA_R2; break;
00184         case  3: ea->audio_codec = AV_CODEC_ID_ADPCM_EA_R3; break;
00185         case -1: break;
00186         default:
00187             av_log(s, AV_LOG_ERROR, "unsupported stream type; revision=%i\n", revision);
00188             return 0;
00189         }
00190         switch (revision2) {
00191         case  8: ea->audio_codec = AV_CODEC_ID_PCM_S16LE_PLANAR; break;
00192         case 10: ea->audio_codec = AV_CODEC_ID_ADPCM_EA_R2; break;
00193         case 16: ea->audio_codec = AV_CODEC_ID_MP3; break;
00194         case -1: break;
00195         default:
00196             ea->audio_codec = AV_CODEC_ID_NONE;
00197             av_log(s, AV_LOG_ERROR, "unsupported stream type; revision2=%i\n", revision2);
00198             return 0;
00199         }
00200         break;
00201     default:
00202         av_log(s, AV_LOG_ERROR, "unsupported stream type; compression_type=%i\n", compression_type);
00203         return 0;
00204     }
00205 
00206     if (ea->sample_rate == -1)
00207         ea->sample_rate = revision==3 ? 48000 : 22050;
00208 
00209     return 1;
00210 }
00211 
00212 /*
00213  * Process EACS sound header
00214  * return 1 if success, 0 if invalid format, otherwise AVERROR_xxx
00215  */
00216 static int process_audio_header_eacs(AVFormatContext *s)
00217 {
00218     EaDemuxContext *ea = s->priv_data;
00219     AVIOContext *pb = s->pb;
00220     int compression_type;
00221 
00222     ea->sample_rate  = ea->big_endian ? avio_rb32(pb) : avio_rl32(pb);
00223     ea->bytes        = avio_r8(pb);   /* 1=8-bit, 2=16-bit */
00224     ea->num_channels = avio_r8(pb);
00225     compression_type = avio_r8(pb);
00226     avio_skip(pb, 13);
00227 
00228     switch (compression_type) {
00229     case 0:
00230         switch (ea->bytes) {
00231         case 1: ea->audio_codec = AV_CODEC_ID_PCM_S8;    break;
00232         case 2: ea->audio_codec = AV_CODEC_ID_PCM_S16LE; break;
00233         }
00234         break;
00235     case 1: ea->audio_codec = AV_CODEC_ID_PCM_MULAW; ea->bytes = 1; break;
00236     case 2: ea->audio_codec = AV_CODEC_ID_ADPCM_IMA_EA_EACS; break;
00237     default:
00238         av_log (s, AV_LOG_ERROR, "unsupported stream type; audio compression_type=%i\n", compression_type);
00239     }
00240 
00241     return 1;
00242 }
00243 
00244 /*
00245  * Process SEAD sound header
00246  * return 1 if success, 0 if invalid format, otherwise AVERROR_xxx
00247  */
00248 static int process_audio_header_sead(AVFormatContext *s)
00249 {
00250     EaDemuxContext *ea = s->priv_data;
00251     AVIOContext *pb = s->pb;
00252 
00253     ea->sample_rate  = avio_rl32(pb);
00254     ea->bytes        = avio_rl32(pb);  /* 1=8-bit, 2=16-bit */
00255     ea->num_channels = avio_rl32(pb);
00256     ea->audio_codec  = AV_CODEC_ID_ADPCM_IMA_EA_SEAD;
00257 
00258     return 1;
00259 }
00260 
00261 static int process_video_header_mdec(AVFormatContext *s)
00262 {
00263     EaDemuxContext *ea = s->priv_data;
00264     AVIOContext *pb = s->pb;
00265     avio_skip(pb, 4);
00266     ea->width  = avio_rl16(pb);
00267     ea->height = avio_rl16(pb);
00268     ea->time_base = (AVRational){1,15};
00269     ea->video_codec = AV_CODEC_ID_MDEC;
00270     return 1;
00271 }
00272 
00273 static int process_video_header_vp6(AVFormatContext *s)
00274 {
00275     EaDemuxContext *ea = s->priv_data;
00276     AVIOContext *pb = s->pb;
00277 
00278     avio_skip(pb, 8);
00279     ea->nb_frames = avio_rl32(pb);
00280     avio_skip(pb, 4);
00281     ea->time_base.den = avio_rl32(pb);
00282     ea->time_base.num = avio_rl32(pb);
00283     ea->video_codec = AV_CODEC_ID_VP6;
00284 
00285     return 1;
00286 }
00287 
00288 static int process_video_header_cmv(AVFormatContext *s)
00289 {
00290     EaDemuxContext *ea = s->priv_data;
00291     int fps;
00292 
00293     avio_skip(s->pb, 10);
00294     fps = avio_rl16(s->pb);
00295     if (fps)
00296         ea->time_base = (AVRational){1, fps};
00297     ea->video_codec = AV_CODEC_ID_CMV;
00298 
00299     return 0;
00300 }
00301 
00302 /*
00303  * Process EA file header
00304  * Returns 1 if the EA file is valid and successfully opened, 0 otherwise
00305  */
00306 static int process_ea_header(AVFormatContext *s) {
00307     uint32_t blockid, size = 0;
00308     EaDemuxContext *ea = s->priv_data;
00309     AVIOContext *pb = s->pb;
00310     int i;
00311 
00312     for (i=0; i<5 && (!ea->audio_codec || !ea->video_codec); i++) {
00313         unsigned int startpos = avio_tell(pb);
00314         int err = 0;
00315 
00316         blockid = avio_rl32(pb);
00317         size = avio_rl32(pb);
00318         if (i == 0)
00319             ea->big_endian = size > 0x000FFFFF;
00320         if (ea->big_endian)
00321             size = av_bswap32(size);
00322 
00323         switch (blockid) {
00324             case ISNh_TAG:
00325                 if (avio_rl32(pb) != EACS_TAG) {
00326                     av_log (s, AV_LOG_ERROR, "unknown 1SNh headerid\n");
00327                     return 0;
00328                 }
00329                 err = process_audio_header_eacs(s);
00330                 break;
00331 
00332             case SCHl_TAG :
00333             case SHEN_TAG :
00334                 blockid = avio_rl32(pb);
00335                 if (blockid == GSTR_TAG) {
00336                     avio_skip(pb, 4);
00337                 } else if ((blockid & 0xFFFF)!=PT00_TAG) {
00338                     av_log (s, AV_LOG_ERROR, "unknown SCHl headerid\n");
00339                     return 0;
00340                 }
00341                 err = process_audio_header_elements(s);
00342                 break;
00343 
00344             case SEAD_TAG:
00345                 err = process_audio_header_sead(s);
00346                 break;
00347 
00348             case MVIh_TAG :
00349                 err = process_video_header_cmv(s);
00350                 break;
00351 
00352             case kVGT_TAG:
00353                 ea->video_codec = AV_CODEC_ID_TGV;
00354                 break;
00355 
00356             case mTCD_TAG :
00357                 err = process_video_header_mdec(s);
00358                 break;
00359 
00360             case MPCh_TAG:
00361                 ea->video_codec = AV_CODEC_ID_MPEG2VIDEO;
00362                 break;
00363 
00364             case pQGT_TAG:
00365             case TGQs_TAG:
00366                 ea->video_codec = AV_CODEC_ID_TGQ;
00367                 break;
00368 
00369             case pIQT_TAG:
00370                 ea->video_codec = AV_CODEC_ID_TQI;
00371                 break;
00372 
00373             case MADk_TAG :
00374                 ea->video_codec = AV_CODEC_ID_MAD;
00375                 break;
00376 
00377             case MVhd_TAG :
00378                 err = process_video_header_vp6(s);
00379                 break;
00380         }
00381 
00382         if (err < 0) {
00383             av_log(s, AV_LOG_ERROR, "error parsing header: %i\n", err);
00384             return err;
00385         }
00386 
00387         avio_seek(pb, startpos + size, SEEK_SET);
00388     }
00389 
00390     avio_seek(pb, 0, SEEK_SET);
00391 
00392     return 1;
00393 }
00394 
00395 
00396 static int ea_probe(AVProbeData *p)
00397 {
00398     switch (AV_RL32(&p->buf[0])) {
00399     case ISNh_TAG:
00400     case SCHl_TAG:
00401     case SEAD_TAG:
00402     case SHEN_TAG:
00403     case kVGT_TAG:
00404     case MADk_TAG:
00405     case MPCh_TAG:
00406     case MVhd_TAG:
00407     case MVIh_TAG:
00408         break;
00409     default:
00410         return 0;
00411     }
00412     if (AV_RL32(&p->buf[4]) > 0xfffff && AV_RB32(&p->buf[4]) > 0xfffff)
00413         return 0;
00414     return AVPROBE_SCORE_MAX;
00415 }
00416 
00417 static int ea_read_header(AVFormatContext *s)
00418 {
00419     EaDemuxContext *ea = s->priv_data;
00420     AVStream *st;
00421 
00422     if (process_ea_header(s)<=0)
00423         return AVERROR(EIO);
00424 
00425     if (ea->video_codec) {
00426         /* initialize the video decoder stream */
00427         st = avformat_new_stream(s, NULL);
00428         if (!st)
00429             return AVERROR(ENOMEM);
00430         ea->video_stream_index = st->index;
00431         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00432         st->codec->codec_id = ea->video_codec;
00433         // parsing is necessary to make FFmpeg generate correct timestamps
00434         if (st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO)
00435             st->need_parsing = AVSTREAM_PARSE_HEADERS;
00436         st->codec->codec_tag = 0;  /* no fourcc */
00437         st->codec->width = ea->width;
00438         st->codec->height = ea->height;
00439         st->duration = st->nb_frames = ea->nb_frames;
00440         if (ea->time_base.num)
00441             avpriv_set_pts_info(st, 64, ea->time_base.num, ea->time_base.den);
00442         st->r_frame_rate =
00443         st->avg_frame_rate = av_inv_q(ea->time_base);
00444     }
00445 
00446     if (ea->audio_codec) {
00447         if (ea->num_channels <= 0) {
00448             av_log(s, AV_LOG_WARNING, "Unsupported number of channels: %d\n", ea->num_channels);
00449             ea->audio_codec = 0;
00450             return 1;
00451         }
00452         if (ea->sample_rate <= 0) {
00453             av_log(s, AV_LOG_ERROR, "Unsupported sample rate: %d\n", ea->sample_rate);
00454             ea->audio_codec = 0;
00455             return 1;
00456         }
00457         if (ea->bytes <= 0) {
00458             av_log(s, AV_LOG_ERROR, "Invalid number of bytes per sample: %d\n", ea->bytes);
00459             ea->audio_codec = AV_CODEC_ID_NONE;
00460             return 1;
00461         }
00462 
00463         /* initialize the audio decoder stream */
00464         st = avformat_new_stream(s, NULL);
00465         if (!st)
00466             return AVERROR(ENOMEM);
00467         avpriv_set_pts_info(st, 33, 1, ea->sample_rate);
00468         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00469         st->codec->codec_id = ea->audio_codec;
00470         st->codec->codec_tag = 0;  /* no tag */
00471         st->codec->channels = ea->num_channels;
00472         st->codec->sample_rate = ea->sample_rate;
00473         st->codec->bits_per_coded_sample = ea->bytes * 8;
00474         st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
00475             st->codec->bits_per_coded_sample / 4;
00476         st->codec->block_align = st->codec->channels*st->codec->bits_per_coded_sample;
00477         ea->audio_stream_index = st->index;
00478         st->start_time = 0;
00479     }
00480 
00481     return 1;
00482 }
00483 
00484 static int ea_read_packet(AVFormatContext *s,
00485                           AVPacket *pkt)
00486 {
00487     EaDemuxContext *ea = s->priv_data;
00488     AVIOContext *pb = s->pb;
00489     int ret = 0;
00490     int packet_read = 0;
00491     int partial_packet = 0;
00492     unsigned int chunk_type, chunk_size;
00493     int key = 0;
00494     int av_uninit(num_samples);
00495 
00496     while (!packet_read || partial_packet) {
00497         chunk_type = avio_rl32(pb);
00498         chunk_size = ea->big_endian ? avio_rb32(pb) : avio_rl32(pb);
00499         if (chunk_size <= 8)
00500             return AVERROR_INVALIDDATA;
00501         chunk_size -= 8;
00502 
00503         switch (chunk_type) {
00504         /* audio data */
00505         case ISNh_TAG:
00506             /* header chunk also contains data; skip over the header portion*/
00507             if (chunk_size < 32)
00508                 return AVERROR_INVALIDDATA;
00509             avio_skip(pb, 32);
00510             chunk_size -= 32;
00511         case ISNd_TAG:
00512         case SCDl_TAG:
00513         case SNDC_TAG:
00514         case SDEN_TAG:
00515             if (!ea->audio_codec) {
00516                 avio_skip(pb, chunk_size);
00517                 break;
00518             } else if (ea->audio_codec == AV_CODEC_ID_PCM_S16LE_PLANAR ||
00519                        ea->audio_codec == AV_CODEC_ID_MP3) {
00520                 num_samples = avio_rl32(pb);
00521                 avio_skip(pb, 8);
00522                 chunk_size -= 12;
00523             }
00524             if (partial_packet) {
00525                 av_log_ask_for_sample(s, "video header followed by audio packet not supported.\n");
00526                 av_free_packet(pkt);
00527                 partial_packet = 0;
00528             }
00529             ret = av_get_packet(pb, pkt, chunk_size);
00530             if (ret < 0)
00531                 return ret;
00532             pkt->stream_index = ea->audio_stream_index;
00533 
00534             switch (ea->audio_codec) {
00535             case AV_CODEC_ID_ADPCM_EA:
00536             case AV_CODEC_ID_ADPCM_EA_R1:
00537             case AV_CODEC_ID_ADPCM_EA_R2:
00538             case AV_CODEC_ID_ADPCM_IMA_EA_EACS:
00539                 pkt->duration = AV_RL32(pkt->data);
00540                 break;
00541             case AV_CODEC_ID_ADPCM_EA_R3:
00542                 pkt->duration = AV_RB32(pkt->data);
00543                 break;
00544             case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:
00545                 pkt->duration = ret * 2 / ea->num_channels;
00546                 break;
00547             case AV_CODEC_ID_PCM_S16LE_PLANAR:
00548             case AV_CODEC_ID_MP3:
00549                 pkt->duration = num_samples;
00550                 break;
00551             default:
00552                 pkt->duration = chunk_size / (ea->bytes * ea->num_channels);
00553             }
00554 
00555             packet_read = 1;
00556             break;
00557 
00558         /* ending tag */
00559         case 0:
00560         case ISNe_TAG:
00561         case SCEl_TAG:
00562         case SEND_TAG:
00563         case SEEN_TAG:
00564             ret = AVERROR(EIO);
00565             packet_read = 1;
00566             break;
00567 
00568         case MVIh_TAG:
00569         case kVGT_TAG:
00570         case pQGT_TAG:
00571         case TGQs_TAG:
00572         case MADk_TAG:
00573             key = AV_PKT_FLAG_KEY;
00574         case MVIf_TAG:
00575         case fVGT_TAG:
00576         case MADm_TAG:
00577         case MADe_TAG:
00578             avio_seek(pb, -8, SEEK_CUR);     // include chunk preamble
00579             chunk_size += 8;
00580             goto get_video_packet;
00581 
00582         case mTCD_TAG:
00583             avio_skip(pb, 8);  // skip ea dct header
00584             chunk_size -= 8;
00585             goto get_video_packet;
00586 
00587         case MV0K_TAG:
00588         case MPCh_TAG:
00589         case pIQT_TAG:
00590             key = AV_PKT_FLAG_KEY;
00591         case MV0F_TAG:
00592 get_video_packet:
00593             if (partial_packet) {
00594                 ret = av_append_packet(pb, pkt, chunk_size);
00595             } else
00596                 ret = av_get_packet(pb, pkt, chunk_size);
00597             if (ret < 0) {
00598                 packet_read = 1;
00599                 break;
00600             }
00601             partial_packet = chunk_type == MVIh_TAG;
00602             pkt->stream_index = ea->video_stream_index;
00603             pkt->flags |= key;
00604             packet_read = 1;
00605             break;
00606 
00607         default:
00608             avio_skip(pb, chunk_size);
00609             break;
00610         }
00611     }
00612 
00613     if (ret < 0 && partial_packet)
00614         av_free_packet(pkt);
00615     return ret;
00616 }
00617 
00618 AVInputFormat ff_ea_demuxer = {
00619     .name           = "ea",
00620     .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts Multimedia"),
00621     .priv_data_size = sizeof(EaDemuxContext),
00622     .read_probe     = ea_probe,
00623     .read_header    = ea_read_header,
00624     .read_packet    = ea_read_packet,
00625 };