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_ask_for_sample(s, "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:
00193             switch (revision) {
00194             case -1:
00195             case  2: ea->audio_codec = AV_CODEC_ID_ADPCM_EA_R1; break;
00196             case  3: ea->audio_codec = AV_CODEC_ID_ADPCM_EA_R2; break;
00197             default:
00198                 av_log_ask_for_sample(s, "unsupported stream type; revision=%i, revision2=%i\n", revision, revision2);
00199                 return 0;
00200             }
00201             break;
00202         case 16: ea->audio_codec = AV_CODEC_ID_MP3; break;
00203         case -1: break;
00204         default:
00205             ea->audio_codec = AV_CODEC_ID_NONE;
00206             av_log_ask_for_sample(s, "unsupported stream type; revision2=%i\n", revision2);
00207             return 0;
00208         }
00209         break;
00210     default:
00211         av_log_ask_for_sample(s, "unsupported stream type; compression_type=%i\n", compression_type);
00212         return 0;
00213     }
00214 
00215     if (ea->sample_rate == -1)
00216         ea->sample_rate = revision==3 ? 48000 : 22050;
00217 
00218     return 1;
00219 }
00220 
00221 /*
00222  * Process EACS sound header
00223  * return 1 if success, 0 if invalid format, otherwise AVERROR_xxx
00224  */
00225 static int process_audio_header_eacs(AVFormatContext *s)
00226 {
00227     EaDemuxContext *ea = s->priv_data;
00228     AVIOContext *pb = s->pb;
00229     int compression_type;
00230 
00231     ea->sample_rate  = ea->big_endian ? avio_rb32(pb) : avio_rl32(pb);
00232     ea->bytes        = avio_r8(pb);   /* 1=8-bit, 2=16-bit */
00233     ea->num_channels = avio_r8(pb);
00234     compression_type = avio_r8(pb);
00235     avio_skip(pb, 13);
00236 
00237     switch (compression_type) {
00238     case 0:
00239         switch (ea->bytes) {
00240         case 1: ea->audio_codec = AV_CODEC_ID_PCM_S8;    break;
00241         case 2: ea->audio_codec = AV_CODEC_ID_PCM_S16LE; break;
00242         }
00243         break;
00244     case 1: ea->audio_codec = AV_CODEC_ID_PCM_MULAW; ea->bytes = 1; break;
00245     case 2: ea->audio_codec = AV_CODEC_ID_ADPCM_IMA_EA_EACS; break;
00246     default:
00247         av_log_ask_for_sample(s, "unsupported stream type; audio compression_type=%i\n", compression_type);
00248     }
00249 
00250     return 1;
00251 }
00252 
00253 /*
00254  * Process SEAD sound header
00255  * return 1 if success, 0 if invalid format, otherwise AVERROR_xxx
00256  */
00257 static int process_audio_header_sead(AVFormatContext *s)
00258 {
00259     EaDemuxContext *ea = s->priv_data;
00260     AVIOContext *pb = s->pb;
00261 
00262     ea->sample_rate  = avio_rl32(pb);
00263     ea->bytes        = avio_rl32(pb);  /* 1=8-bit, 2=16-bit */
00264     ea->num_channels = avio_rl32(pb);
00265     ea->audio_codec  = AV_CODEC_ID_ADPCM_IMA_EA_SEAD;
00266 
00267     return 1;
00268 }
00269 
00270 static int process_video_header_mdec(AVFormatContext *s)
00271 {
00272     EaDemuxContext *ea = s->priv_data;
00273     AVIOContext *pb = s->pb;
00274     avio_skip(pb, 4);
00275     ea->width  = avio_rl16(pb);
00276     ea->height = avio_rl16(pb);
00277     ea->time_base = (AVRational){1,15};
00278     ea->video_codec = AV_CODEC_ID_MDEC;
00279     return 1;
00280 }
00281 
00282 static int process_video_header_vp6(AVFormatContext *s)
00283 {
00284     EaDemuxContext *ea = s->priv_data;
00285     AVIOContext *pb = s->pb;
00286 
00287     avio_skip(pb, 8);
00288     ea->nb_frames = avio_rl32(pb);
00289     avio_skip(pb, 4);
00290     ea->time_base.den = avio_rl32(pb);
00291     ea->time_base.num = avio_rl32(pb);
00292     ea->video_codec = AV_CODEC_ID_VP6;
00293 
00294     return 1;
00295 }
00296 
00297 static int process_video_header_cmv(AVFormatContext *s)
00298 {
00299     EaDemuxContext *ea = s->priv_data;
00300     int fps;
00301 
00302     avio_skip(s->pb, 10);
00303     fps = avio_rl16(s->pb);
00304     if (fps)
00305         ea->time_base = (AVRational){1, fps};
00306     ea->video_codec = AV_CODEC_ID_CMV;
00307 
00308     return 0;
00309 }
00310 
00311 /*
00312  * Process EA file header
00313  * Returns 1 if the EA file is valid and successfully opened, 0 otherwise
00314  */
00315 static int process_ea_header(AVFormatContext *s) {
00316     uint32_t blockid, size = 0;
00317     EaDemuxContext *ea = s->priv_data;
00318     AVIOContext *pb = s->pb;
00319     int i;
00320 
00321     for (i=0; i<5 && (!ea->audio_codec || !ea->video_codec); i++) {
00322         unsigned int startpos = avio_tell(pb);
00323         int err = 0;
00324 
00325         blockid = avio_rl32(pb);
00326         size = avio_rl32(pb);
00327         if (i == 0)
00328             ea->big_endian = size > 0x000FFFFF;
00329         if (ea->big_endian)
00330             size = av_bswap32(size);
00331 
00332         switch (blockid) {
00333             case ISNh_TAG:
00334                 if (avio_rl32(pb) != EACS_TAG) {
00335                     av_log_ask_for_sample(s, "unknown 1SNh headerid\n");
00336                     return 0;
00337                 }
00338                 err = process_audio_header_eacs(s);
00339                 break;
00340 
00341             case SCHl_TAG :
00342             case SHEN_TAG :
00343                 blockid = avio_rl32(pb);
00344                 if (blockid == GSTR_TAG) {
00345                     avio_skip(pb, 4);
00346                 } else if ((blockid & 0xFFFF)!=PT00_TAG) {
00347                     av_log_ask_for_sample(s, "unknown SCHl headerid\n");
00348                     return 0;
00349                 }
00350                 err = process_audio_header_elements(s);
00351                 break;
00352 
00353             case SEAD_TAG:
00354                 err = process_audio_header_sead(s);
00355                 break;
00356 
00357             case MVIh_TAG :
00358                 err = process_video_header_cmv(s);
00359                 break;
00360 
00361             case kVGT_TAG:
00362                 ea->video_codec = AV_CODEC_ID_TGV;
00363                 break;
00364 
00365             case mTCD_TAG :
00366                 err = process_video_header_mdec(s);
00367                 break;
00368 
00369             case MPCh_TAG:
00370                 ea->video_codec = AV_CODEC_ID_MPEG2VIDEO;
00371                 break;
00372 
00373             case pQGT_TAG:
00374             case TGQs_TAG:
00375                 ea->video_codec = AV_CODEC_ID_TGQ;
00376                 break;
00377 
00378             case pIQT_TAG:
00379                 ea->video_codec = AV_CODEC_ID_TQI;
00380                 break;
00381 
00382             case MADk_TAG :
00383                 ea->video_codec = AV_CODEC_ID_MAD;
00384                 break;
00385 
00386             case MVhd_TAG :
00387                 err = process_video_header_vp6(s);
00388                 break;
00389         }
00390 
00391         if (err < 0) {
00392             av_log(s, AV_LOG_ERROR, "error parsing header: %i\n", err);
00393             return err;
00394         }
00395 
00396         avio_seek(pb, startpos + size, SEEK_SET);
00397     }
00398 
00399     avio_seek(pb, 0, SEEK_SET);
00400 
00401     return 1;
00402 }
00403 
00404 
00405 static int ea_probe(AVProbeData *p)
00406 {
00407     switch (AV_RL32(&p->buf[0])) {
00408     case ISNh_TAG:
00409     case SCHl_TAG:
00410     case SEAD_TAG:
00411     case SHEN_TAG:
00412     case kVGT_TAG:
00413     case MADk_TAG:
00414     case MPCh_TAG:
00415     case MVhd_TAG:
00416     case MVIh_TAG:
00417         break;
00418     default:
00419         return 0;
00420     }
00421     if (AV_RL32(&p->buf[4]) > 0xfffff && AV_RB32(&p->buf[4]) > 0xfffff)
00422         return 0;
00423     return AVPROBE_SCORE_MAX;
00424 }
00425 
00426 static int ea_read_header(AVFormatContext *s)
00427 {
00428     EaDemuxContext *ea = s->priv_data;
00429     AVStream *st;
00430 
00431     if (process_ea_header(s)<=0)
00432         return AVERROR(EIO);
00433 
00434     if (ea->video_codec) {
00435         /* initialize the video decoder stream */
00436         st = avformat_new_stream(s, NULL);
00437         if (!st)
00438             return AVERROR(ENOMEM);
00439         ea->video_stream_index = st->index;
00440         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00441         st->codec->codec_id = ea->video_codec;
00442         // parsing is necessary to make FFmpeg generate correct timestamps
00443         if (st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO)
00444             st->need_parsing = AVSTREAM_PARSE_HEADERS;
00445         st->codec->codec_tag = 0;  /* no fourcc */
00446         st->codec->width = ea->width;
00447         st->codec->height = ea->height;
00448         st->duration = st->nb_frames = ea->nb_frames;
00449         if (ea->time_base.num)
00450             avpriv_set_pts_info(st, 64, ea->time_base.num, ea->time_base.den);
00451         st->r_frame_rate =
00452         st->avg_frame_rate = av_inv_q(ea->time_base);
00453     }
00454 
00455     if (ea->audio_codec) {
00456         if (ea->num_channels <= 0) {
00457             av_log(s, AV_LOG_WARNING, "Unsupported number of channels: %d\n", ea->num_channels);
00458             ea->audio_codec = 0;
00459             return 1;
00460         }
00461         if (ea->sample_rate <= 0) {
00462             av_log(s, AV_LOG_ERROR, "Unsupported sample rate: %d\n", ea->sample_rate);
00463             ea->audio_codec = 0;
00464             return 1;
00465         }
00466         if (ea->bytes <= 0) {
00467             av_log(s, AV_LOG_ERROR, "Invalid number of bytes per sample: %d\n", ea->bytes);
00468             ea->audio_codec = AV_CODEC_ID_NONE;
00469             return 1;
00470         }
00471 
00472         /* initialize the audio decoder stream */
00473         st = avformat_new_stream(s, NULL);
00474         if (!st)
00475             return AVERROR(ENOMEM);
00476         avpriv_set_pts_info(st, 33, 1, ea->sample_rate);
00477         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00478         st->codec->codec_id = ea->audio_codec;
00479         st->codec->codec_tag = 0;  /* no tag */
00480         st->codec->channels = ea->num_channels;
00481         st->codec->sample_rate = ea->sample_rate;
00482         st->codec->bits_per_coded_sample = ea->bytes * 8;
00483         st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
00484             st->codec->bits_per_coded_sample / 4;
00485         st->codec->block_align = st->codec->channels*st->codec->bits_per_coded_sample;
00486         ea->audio_stream_index = st->index;
00487         st->start_time = 0;
00488     }
00489 
00490     return 1;
00491 }
00492 
00493 static int ea_read_packet(AVFormatContext *s,
00494                           AVPacket *pkt)
00495 {
00496     EaDemuxContext *ea = s->priv_data;
00497     AVIOContext *pb = s->pb;
00498     int ret = 0;
00499     int packet_read = 0;
00500     int partial_packet = 0;
00501     unsigned int chunk_type, chunk_size;
00502     int key = 0;
00503     int av_uninit(num_samples);
00504 
00505     while (!packet_read || partial_packet) {
00506         chunk_type = avio_rl32(pb);
00507         chunk_size = ea->big_endian ? avio_rb32(pb) : avio_rl32(pb);
00508         if (chunk_size <= 8)
00509             return AVERROR_INVALIDDATA;
00510         chunk_size -= 8;
00511 
00512         switch (chunk_type) {
00513         /* audio data */
00514         case ISNh_TAG:
00515             /* header chunk also contains data; skip over the header portion*/
00516             if (chunk_size < 32)
00517                 return AVERROR_INVALIDDATA;
00518             avio_skip(pb, 32);
00519             chunk_size -= 32;
00520         case ISNd_TAG:
00521         case SCDl_TAG:
00522         case SNDC_TAG:
00523         case SDEN_TAG:
00524             if (!ea->audio_codec) {
00525                 avio_skip(pb, chunk_size);
00526                 break;
00527             } else if (ea->audio_codec == AV_CODEC_ID_PCM_S16LE_PLANAR ||
00528                        ea->audio_codec == AV_CODEC_ID_MP3) {
00529                 num_samples = avio_rl32(pb);
00530                 avio_skip(pb, 8);
00531                 chunk_size -= 12;
00532             }
00533             if (partial_packet) {
00534                 av_log_ask_for_sample(s, "video header followed by audio packet not supported.\n");
00535                 av_free_packet(pkt);
00536                 partial_packet = 0;
00537             }
00538             ret = av_get_packet(pb, pkt, chunk_size);
00539             if (ret < 0)
00540                 return ret;
00541             pkt->stream_index = ea->audio_stream_index;
00542 
00543             switch (ea->audio_codec) {
00544             case AV_CODEC_ID_ADPCM_EA:
00545             case AV_CODEC_ID_ADPCM_EA_R1:
00546             case AV_CODEC_ID_ADPCM_EA_R2:
00547             case AV_CODEC_ID_ADPCM_IMA_EA_EACS:
00548                 if (pkt->size >= 4)
00549                     pkt->duration = AV_RL32(pkt->data);
00550                 break;
00551             case AV_CODEC_ID_ADPCM_EA_R3:
00552                 if (pkt->size >= 4)
00553                     pkt->duration = AV_RB32(pkt->data);
00554                 break;
00555             case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:
00556                 pkt->duration = ret * 2 / ea->num_channels;
00557                 break;
00558             case AV_CODEC_ID_PCM_S16LE_PLANAR:
00559             case AV_CODEC_ID_MP3:
00560                 pkt->duration = num_samples;
00561                 break;
00562             default:
00563                 pkt->duration = chunk_size / (ea->bytes * ea->num_channels);
00564             }
00565 
00566             packet_read = 1;
00567             break;
00568 
00569         /* ending tag */
00570         case 0:
00571         case ISNe_TAG:
00572         case SCEl_TAG:
00573         case SEND_TAG:
00574         case SEEN_TAG:
00575             ret = AVERROR(EIO);
00576             packet_read = 1;
00577             break;
00578 
00579         case MVIh_TAG:
00580         case kVGT_TAG:
00581         case pQGT_TAG:
00582         case TGQs_TAG:
00583         case MADk_TAG:
00584             key = AV_PKT_FLAG_KEY;
00585         case MVIf_TAG:
00586         case fVGT_TAG:
00587         case MADm_TAG:
00588         case MADe_TAG:
00589             avio_seek(pb, -8, SEEK_CUR);     // include chunk preamble
00590             chunk_size += 8;
00591             goto get_video_packet;
00592 
00593         case mTCD_TAG:
00594             avio_skip(pb, 8);  // skip ea dct header
00595             chunk_size -= 8;
00596             goto get_video_packet;
00597 
00598         case MV0K_TAG:
00599         case MPCh_TAG:
00600         case pIQT_TAG:
00601             key = AV_PKT_FLAG_KEY;
00602         case MV0F_TAG:
00603 get_video_packet:
00604             if (partial_packet) {
00605                 ret = av_append_packet(pb, pkt, chunk_size);
00606             } else
00607                 ret = av_get_packet(pb, pkt, chunk_size);
00608             if (ret < 0) {
00609                 packet_read = 1;
00610                 break;
00611             }
00612             partial_packet = chunk_type == MVIh_TAG;
00613             pkt->stream_index = ea->video_stream_index;
00614             pkt->flags |= key;
00615             packet_read = 1;
00616             break;
00617 
00618         default:
00619             avio_skip(pb, chunk_size);
00620             break;
00621         }
00622     }
00623 
00624     if (ret < 0 && partial_packet)
00625         av_free_packet(pkt);
00626     return ret;
00627 }
00628 
00629 AVInputFormat ff_ea_demuxer = {
00630     .name           = "ea",
00631     .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts Multimedia"),
00632     .priv_data_size = sizeof(EaDemuxContext),
00633     .read_probe     = ea_probe,
00634     .read_header    = ea_read_header,
00635     .read_packet    = ea_read_packet,
00636 };