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electronicarts.c
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1 /* Electronic Arts Multimedia File Demuxer
2  * Copyright (c) 2004 The FFmpeg Project
3  * Copyright (c) 2006-2008 Peter Ross
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Electronic Arts Multimedia file demuxer (WVE/UV2/etc.)
25  * by Robin Kay (komadori at gekkou.co.uk)
26  */
27 
28 #include <inttypes.h>
29 
30 #include "libavutil/intreadwrite.h"
31 #include "avformat.h"
32 #include "internal.h"
33 
34 #define SCHl_TAG MKTAG('S', 'C', 'H', 'l')
35 #define SEAD_TAG MKTAG('S', 'E', 'A', 'D') /* Sxxx header */
36 #define SNDC_TAG MKTAG('S', 'N', 'D', 'C') /* Sxxx data */
37 #define SEND_TAG MKTAG('S', 'E', 'N', 'D') /* Sxxx end */
38 #define SHEN_TAG MKTAG('S', 'H', 'E', 'N') /* SxEN header */
39 #define SDEN_TAG MKTAG('S', 'D', 'E', 'N') /* SxEN data */
40 #define SEEN_TAG MKTAG('S', 'E', 'E', 'N') /* SxEN end */
41 #define ISNh_TAG MKTAG('1', 'S', 'N', 'h') /* 1SNx header */
42 #define EACS_TAG MKTAG('E', 'A', 'C', 'S')
43 #define ISNd_TAG MKTAG('1', 'S', 'N', 'd') /* 1SNx data */
44 #define ISNe_TAG MKTAG('1', 'S', 'N', 'e') /* 1SNx end */
45 #define PT00_TAG MKTAG('P', 'T', 0x0, 0x0)
46 #define GSTR_TAG MKTAG('G', 'S', 'T', 'R')
47 #define SCDl_TAG MKTAG('S', 'C', 'D', 'l')
48 #define SCEl_TAG MKTAG('S', 'C', 'E', 'l')
49 #define kVGT_TAG MKTAG('k', 'V', 'G', 'T') /* TGV I-frame */
50 #define fVGT_TAG MKTAG('f', 'V', 'G', 'T') /* TGV P-frame */
51 #define mTCD_TAG MKTAG('m', 'T', 'C', 'D') /* MDEC */
52 #define MADk_TAG MKTAG('M', 'A', 'D', 'k') /* MAD I-frame */
53 #define MADm_TAG MKTAG('M', 'A', 'D', 'm') /* MAD P-frame */
54 #define MADe_TAG MKTAG('M', 'A', 'D', 'e') /* MAD lqp-frame */
55 #define MPCh_TAG MKTAG('M', 'P', 'C', 'h') /* MPEG-2 */
56 #define TGQs_TAG MKTAG('T', 'G', 'Q', 's') /* TGQ I-frame (appears in .TGQ files) */
57 #define pQGT_TAG MKTAG('p', 'Q', 'G', 'T') /* TGQ I-frame (appears in .UV files) */
58 #define pIQT_TAG MKTAG('p', 'I', 'Q', 'T') /* TQI/UV2 I-frame (.UV2/.WVE) */
59 #define MVhd_TAG MKTAG('M', 'V', 'h', 'd')
60 #define MV0K_TAG MKTAG('M', 'V', '0', 'K')
61 #define MV0F_TAG MKTAG('M', 'V', '0', 'F')
62 #define MVIh_TAG MKTAG('M', 'V', 'I', 'h') /* CMV header */
63 #define MVIf_TAG MKTAG('M', 'V', 'I', 'f') /* CMV I-frame */
64 
65 typedef struct EaDemuxContext {
66  int big_endian;
67 
68  enum AVCodecID video_codec;
69  AVRational time_base;
70  int width, height;
71  int nb_frames;
72  int video_stream_index;
73 
74  enum AVCodecID audio_codec;
75  int audio_stream_index;
76 
77  int bytes;
78  int sample_rate;
79  int num_channels;
80  int num_samples;
81 } EaDemuxContext;
82 
83 static uint32_t read_arbitrary(AVIOContext *pb)
84 {
85  uint8_t size, byte;
86  int i;
87  uint32_t word;
88 
89  size = avio_r8(pb);
90 
91  word = 0;
92  for (i = 0; i < size; i++) {
93  byte = avio_r8(pb);
94  word <<= 8;
95  word |= byte;
96  }
97 
98  return word;
99 }
100 
101 static int process_audio_header_elements(AVFormatContext *s)
102 {
103  EaDemuxContext *ea = s->priv_data;
104  AVIOContext *pb = s->pb;
105  int in_header = 1;
106  int compression_type = -1, revision = -1, revision2 = -1;
107 
108  ea->bytes = 2;
109  ea->sample_rate = -1;
110  ea->num_channels = 1;
111 
112  while (!avio_feof(pb) && in_header) {
113  int in_subheader;
114  uint8_t byte;
115  byte = avio_r8(pb);
116 
117  switch (byte) {
118  case 0xFD:
119  av_log(s, AV_LOG_DEBUG, "entered audio subheader\n");
120  in_subheader = 1;
121  while (!avio_feof(pb) && in_subheader) {
122  uint8_t subbyte;
123  subbyte = avio_r8(pb);
124 
125  switch (subbyte) {
126  case 0x80:
127  revision = read_arbitrary(pb);
128  av_log(s, AV_LOG_DEBUG,
129  "revision (element 0x80) set to 0x%08x\n", revision);
130  break;
131  case 0x82:
132  ea->num_channels = read_arbitrary(pb);
133  av_log(s, AV_LOG_DEBUG,
134  "num_channels (element 0x82) set to 0x%08x\n",
135  ea->num_channels);
136  break;
137  case 0x83:
138  compression_type = read_arbitrary(pb);
139  av_log(s, AV_LOG_DEBUG,
140  "compression_type (element 0x83) set to 0x%08x\n",
141  compression_type);
142  break;
143  case 0x84:
144  ea->sample_rate = read_arbitrary(pb);
145  av_log(s, AV_LOG_DEBUG,
146  "sample_rate (element 0x84) set to %i\n",
147  ea->sample_rate);
148  break;
149  case 0x85:
150  ea->num_samples = read_arbitrary(pb);
151  av_log(s, AV_LOG_DEBUG,
152  "num_samples (element 0x85) set to 0x%08x\n",
153  ea->num_samples);
154  break;
155  case 0x8A:
156  av_log(s, AV_LOG_DEBUG,
157  "element 0x%02x set to 0x%08"PRIx32"\n",
158  subbyte, read_arbitrary(pb));
159  av_log(s, AV_LOG_DEBUG, "exited audio subheader\n");
160  in_subheader = 0;
161  break;
162  case 0xA0:
163  revision2 = read_arbitrary(pb);
164  av_log(s, AV_LOG_DEBUG,
165  "revision2 (element 0xA0) set to 0x%08x\n",
166  revision2);
167  break;
168  case 0xFF:
169  av_log(s, AV_LOG_DEBUG,
170  "end of header block reached (within audio subheader)\n");
171  in_subheader = 0;
172  in_header = 0;
173  break;
174  default:
175  av_log(s, AV_LOG_DEBUG,
176  "element 0x%02x set to 0x%08"PRIx32"\n",
177  subbyte, read_arbitrary(pb));
178  break;
179  }
180  }
181  break;
182  case 0xFF:
183  av_log(s, AV_LOG_DEBUG, "end of header block reached\n");
184  in_header = 0;
185  break;
186  default:
187  av_log(s, AV_LOG_DEBUG,
188  "header element 0x%02x set to 0x%08"PRIx32"\n",
189  byte, read_arbitrary(pb));
190  break;
191  }
192  }
193 
194  switch (compression_type) {
195  case 0:
196  ea->audio_codec = AV_CODEC_ID_PCM_S16LE;
197  break;
198  case 7:
199  ea->audio_codec = AV_CODEC_ID_ADPCM_EA;
200  break;
201  case -1:
202  switch (revision) {
203  case 1:
204  ea->audio_codec = AV_CODEC_ID_ADPCM_EA_R1;
205  break;
206  case 2:
207  ea->audio_codec = AV_CODEC_ID_ADPCM_EA_R2;
208  break;
209  case 3:
210  ea->audio_codec = AV_CODEC_ID_ADPCM_EA_R3;
211  break;
212  case -1:
213  break;
214  default:
215  avpriv_request_sample(s, "stream type; revision=%i", revision);
216  return 0;
217  }
218  switch (revision2) {
219  case 8:
220  ea->audio_codec = AV_CODEC_ID_PCM_S16LE_PLANAR;
221  break;
222  case 10:
223  switch (revision) {
224  case -1:
225  case 2: ea->audio_codec = AV_CODEC_ID_ADPCM_EA_R1; break;
226  case 3: ea->audio_codec = AV_CODEC_ID_ADPCM_EA_R2; break;
227  default:
228  avpriv_request_sample(s, "stream type; revision=%i, revision2=%i", revision, revision2);
229  return 0;
230  }
231  break;
232  case 16:
233  ea->audio_codec = AV_CODEC_ID_MP3;
234  break;
235  case -1:
236  break;
237  default:
238  ea->audio_codec = AV_CODEC_ID_NONE;
239  avpriv_request_sample(s, "stream type; revision2=%i", revision2);
240  return 0;
241  }
242  break;
243  default:
244  avpriv_request_sample(s,
245  "stream type; compression_type=%i",
246  compression_type);
247  return 0;
248  }
249 
250  if (ea->sample_rate == -1)
251  ea->sample_rate = revision == 3 ? 48000 : 22050;
252 
253  return 1;
254 }
255 
256 static void process_audio_header_eacs(AVFormatContext *s)
257 {
258  EaDemuxContext *ea = s->priv_data;
259  AVIOContext *pb = s->pb;
260  int compression_type;
261 
262  ea->sample_rate = ea->big_endian ? avio_rb32(pb) : avio_rl32(pb);
263  ea->bytes = avio_r8(pb); /* 1=8-bit, 2=16-bit */
264  ea->num_channels = avio_r8(pb);
265  compression_type = avio_r8(pb);
266  avio_skip(pb, 13);
267 
268  switch (compression_type) {
269  case 0:
270  switch (ea->bytes) {
271  case 1:
272  ea->audio_codec = AV_CODEC_ID_PCM_S8;
273  break;
274  case 2:
275  ea->audio_codec = AV_CODEC_ID_PCM_S16LE;
276  break;
277  }
278  break;
279  case 1:
280  ea->audio_codec = AV_CODEC_ID_PCM_MULAW;
281  ea->bytes = 1;
282  break;
283  case 2:
284  ea->audio_codec = AV_CODEC_ID_ADPCM_IMA_EA_EACS;
285  break;
286  default:
287  avpriv_request_sample(s,
288  "stream type; audio compression_type=%i",
289  compression_type);
290  }
291 }
292 
293 static void process_audio_header_sead(AVFormatContext *s)
294 {
295  EaDemuxContext *ea = s->priv_data;
296  AVIOContext *pb = s->pb;
297 
298  ea->sample_rate = avio_rl32(pb);
299  ea->bytes = avio_rl32(pb); /* 1=8-bit, 2=16-bit */
300  ea->num_channels = avio_rl32(pb);
301  ea->audio_codec = AV_CODEC_ID_ADPCM_IMA_EA_SEAD;
302 }
303 
304 static void process_video_header_mdec(AVFormatContext *s)
305 {
306  EaDemuxContext *ea = s->priv_data;
307  AVIOContext *pb = s->pb;
308  avio_skip(pb, 4);
309  ea->width = avio_rl16(pb);
310  ea->height = avio_rl16(pb);
311  ea->time_base = (AVRational) { 1, 15 };
312  ea->video_codec = AV_CODEC_ID_MDEC;
313 }
314 
315 static int process_video_header_vp6(AVFormatContext *s)
316 {
317  EaDemuxContext *ea = s->priv_data;
318  AVIOContext *pb = s->pb;
319 
320  avio_skip(pb, 8);
321  ea->nb_frames = avio_rl32(pb);
322  avio_skip(pb, 4);
323  ea->time_base.den = avio_rl32(pb);
324  ea->time_base.num = avio_rl32(pb);
325  if (ea->time_base.den <= 0 || ea->time_base.num <= 0) {
326  av_log(s, AV_LOG_ERROR, "Timebase is invalid\n");
327  return AVERROR_INVALIDDATA;
328  }
329  ea->video_codec = AV_CODEC_ID_VP6;
330 
331  return 1;
332 }
333 
334 static void process_video_header_cmv(AVFormatContext *s)
335 {
336  EaDemuxContext *ea = s->priv_data;
337  int fps;
338 
339  avio_skip(s->pb, 10);
340  fps = avio_rl16(s->pb);
341  if (fps)
342  ea->time_base = (AVRational) { 1, fps };
343  ea->video_codec = AV_CODEC_ID_CMV;
344 }
345 
346 /* Process EA file header.
347  * Return 1 if the EA file is valid and successfully opened, 0 otherwise. */
348 static int process_ea_header(AVFormatContext *s)
349 {
350  uint32_t blockid, size = 0;
351  EaDemuxContext *ea = s->priv_data;
352  AVIOContext *pb = s->pb;
353  int i;
354 
355  for (i = 0; i < 5 && (!ea->audio_codec || !ea->video_codec); i++) {
356  uint64_t startpos = avio_tell(pb);
357  int err = 0;
358 
359  blockid = avio_rl32(pb);
360  size = avio_rl32(pb);
361  if (i == 0)
362  ea->big_endian = size > av_bswap32(size);
363  if (ea->big_endian)
364  size = av_bswap32(size);
365 
366  if (size < 8) {
367  av_log(s, AV_LOG_ERROR, "chunk size too small\n");
368  return AVERROR_INVALIDDATA;
369  }
370 
371  switch (blockid) {
372  case ISNh_TAG:
373  if (avio_rl32(pb) != EACS_TAG) {
374  avpriv_request_sample(s, "unknown 1SNh headerid");
375  return 0;
376  }
377  process_audio_header_eacs(s);
378  break;
379 
380  case SCHl_TAG:
381  case SHEN_TAG:
382  blockid = avio_rl32(pb);
383  if (blockid == GSTR_TAG) {
384  avio_skip(pb, 4);
385  } else if ((blockid & 0xFFFF) != PT00_TAG) {
386  avpriv_request_sample(s, "unknown SCHl headerid");
387  return 0;
388  }
389  err = process_audio_header_elements(s);
390  break;
391 
392  case SEAD_TAG:
393  process_audio_header_sead(s);
394  break;
395 
396  case MVIh_TAG:
397  process_video_header_cmv(s);
398  break;
399 
400  case kVGT_TAG:
401  ea->video_codec = AV_CODEC_ID_TGV;
402  break;
403 
404  case mTCD_TAG:
405  process_video_header_mdec(s);
406  break;
407 
408  case MPCh_TAG:
409  ea->video_codec = AV_CODEC_ID_MPEG2VIDEO;
410  break;
411 
412  case pQGT_TAG:
413  case TGQs_TAG:
414  ea->video_codec = AV_CODEC_ID_TGQ;
415  ea->time_base = (AVRational) { 1, 15 };
416  break;
417 
418  case pIQT_TAG:
419  ea->video_codec = AV_CODEC_ID_TQI;
420  ea->time_base = (AVRational) { 1, 15 };
421  break;
422 
423  case MADk_TAG:
424  ea->video_codec = AV_CODEC_ID_MAD;
425  avio_skip(pb, 6);
426  ea->time_base = (AVRational) { avio_rl16(pb), 1000 };
427  break;
428 
429  case MVhd_TAG:
430  err = process_video_header_vp6(s);
431  break;
432  }
433 
434  if (err < 0) {
435  av_log(s, AV_LOG_ERROR, "error parsing header: %i\n", err);
436  return err;
437  }
438 
439  avio_seek(pb, startpos + size, SEEK_SET);
440  }
441 
442  avio_seek(pb, 0, SEEK_SET);
443 
444  return 1;
445 }
446 
447 static int ea_probe(AVProbeData *p)
448 {
449  unsigned big_endian, size;
450 
451  switch (AV_RL32(&p->buf[0])) {
452  case ISNh_TAG:
453  case SCHl_TAG:
454  case SEAD_TAG:
455  case SHEN_TAG:
456  case kVGT_TAG:
457  case MADk_TAG:
458  case MPCh_TAG:
459  case MVhd_TAG:
460  case MVIh_TAG:
461  break;
462  default:
463  return 0;
464  }
465  size = AV_RL32(&p->buf[4]);
466  big_endian = size > 0x000FFFFF;
467  if (big_endian)
468  size = av_bswap32(size);
469  if (size > 0xfffff || size < 8)
470  return 0;
471 
472  return AVPROBE_SCORE_MAX;
473 }
474 
475 static int ea_read_header(AVFormatContext *s)
476 {
477  EaDemuxContext *ea = s->priv_data;
478  AVStream *st;
479 
480  if (process_ea_header(s)<=0)
481  return AVERROR(EIO);
482 
483  if (ea->video_codec) {
484  /* initialize the video decoder stream */
485  st = avformat_new_stream(s, NULL);
486  if (!st)
487  return AVERROR(ENOMEM);
488  ea->video_stream_index = st->index;
489  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
490  st->codec->codec_id = ea->video_codec;
491  // parsing is necessary to make FFmpeg generate correct timestamps
492  if (st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO)
493  st->need_parsing = AVSTREAM_PARSE_HEADERS;
494  st->codec->codec_tag = 0; /* no fourcc */
495  st->codec->width = ea->width;
496  st->codec->height = ea->height;
497  st->duration = st->nb_frames = ea->nb_frames;
498  if (ea->time_base.num)
499  avpriv_set_pts_info(st, 64, ea->time_base.num, ea->time_base.den);
500  st->r_frame_rate =
501  st->avg_frame_rate = av_inv_q(ea->time_base);
502  }
503 
504  if (ea->audio_codec) {
505  if (ea->num_channels <= 0 || ea->num_channels > 2) {
506  av_log(s, AV_LOG_WARNING,
507  "Unsupported number of channels: %d\n", ea->num_channels);
508  ea->audio_codec = 0;
509  return 1;
510  }
511  if (ea->sample_rate <= 0) {
512  av_log(s, AV_LOG_ERROR,
513  "Unsupported sample rate: %d\n", ea->sample_rate);
514  ea->audio_codec = 0;
515  return 1;
516  }
517  if (ea->bytes <= 0) {
518  av_log(s, AV_LOG_ERROR,
519  "Invalid number of bytes per sample: %d\n", ea->bytes);
520  ea->audio_codec = AV_CODEC_ID_NONE;
521  return 1;
522  }
523 
524  /* initialize the audio decoder stream */
525  st = avformat_new_stream(s, NULL);
526  if (!st)
527  return AVERROR(ENOMEM);
528  avpriv_set_pts_info(st, 33, 1, ea->sample_rate);
529  st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
530  st->codec->codec_id = ea->audio_codec;
531  st->codec->codec_tag = 0; /* no tag */
532  st->codec->channels = ea->num_channels;
533  st->codec->sample_rate = ea->sample_rate;
534  st->codec->bits_per_coded_sample = ea->bytes * 8;
535  st->codec->bit_rate = st->codec->channels *
536  st->codec->sample_rate *
537  st->codec->bits_per_coded_sample / 4;
538  st->codec->block_align = st->codec->channels *
539  st->codec->bits_per_coded_sample;
540  ea->audio_stream_index = st->index;
541  st->start_time = 0;
542  }
543 
544  return 1;
545 }
546 
547 static int ea_read_packet(AVFormatContext *s, AVPacket *pkt)
548 {
549  EaDemuxContext *ea = s->priv_data;
550  AVIOContext *pb = s->pb;
551  int partial_packet = 0;
552  unsigned int chunk_type, chunk_size;
553  int ret = 0, packet_read = 0, key = 0;
554  int av_uninit(num_samples);
555 
556  while (!packet_read || partial_packet) {
557  chunk_type = avio_rl32(pb);
558  chunk_size = ea->big_endian ? avio_rb32(pb) : avio_rl32(pb);
559  if (chunk_size < 8)
560  return AVERROR_INVALIDDATA;
561  chunk_size -= 8;
562 
563  switch (chunk_type) {
564  /* audio data */
565  case ISNh_TAG:
566  /* header chunk also contains data; skip over the header portion */
567  if (chunk_size < 32)
568  return AVERROR_INVALIDDATA;
569  avio_skip(pb, 32);
570  chunk_size -= 32;
571  case ISNd_TAG:
572  case SCDl_TAG:
573  case SNDC_TAG:
574  case SDEN_TAG:
575  if (!ea->audio_codec) {
576  avio_skip(pb, chunk_size);
577  break;
578  } else if (ea->audio_codec == AV_CODEC_ID_PCM_S16LE_PLANAR ||
579  ea->audio_codec == AV_CODEC_ID_MP3) {
580  num_samples = avio_rl32(pb);
581  avio_skip(pb, 8);
582  chunk_size -= 12;
583  }
584 
585  if (partial_packet) {
586  avpriv_request_sample(s, "video header followed by audio packet");
587  av_free_packet(pkt);
588  partial_packet = 0;
589  }
590 
591  if (!chunk_size)
592  continue;
593 
594  ret = av_get_packet(pb, pkt, chunk_size);
595  if (ret < 0)
596  return ret;
597  pkt->stream_index = ea->audio_stream_index;
598 
599  switch (ea->audio_codec) {
600  case AV_CODEC_ID_ADPCM_EA:
601  case AV_CODEC_ID_ADPCM_EA_R1:
602  case AV_CODEC_ID_ADPCM_EA_R2:
603  case AV_CODEC_ID_ADPCM_IMA_EA_EACS:
604  case AV_CODEC_ID_ADPCM_EA_R3:
605  if (pkt->size < 4) {
606  av_log(s, AV_LOG_ERROR, "Packet is too short\n");
607  av_free_packet(pkt);
608  return AVERROR_INVALIDDATA;
609  }
610  if (ea->audio_codec == AV_CODEC_ID_ADPCM_EA_R3)
611  pkt->duration = AV_RB32(pkt->data);
612  else
613  pkt->duration = AV_RL32(pkt->data);
614  break;
615  case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:
616  pkt->duration = ret * 2 / ea->num_channels;
617  break;
618  case AV_CODEC_ID_PCM_S16LE_PLANAR:
619  case AV_CODEC_ID_MP3:
620  pkt->duration = num_samples;
621  break;
622  default:
623  pkt->duration = chunk_size / (ea->bytes * ea->num_channels);
624  }
625 
626  packet_read = 1;
627  break;
628 
629  /* ending tag */
630  case 0:
631  case ISNe_TAG:
632  case SCEl_TAG:
633  case SEND_TAG:
634  case SEEN_TAG:
635  ret = AVERROR(EIO);
636  packet_read = 1;
637  break;
638 
639  case MVIh_TAG:
640  case kVGT_TAG:
641  case pQGT_TAG:
642  case TGQs_TAG:
643  case MADk_TAG:
644  key = AV_PKT_FLAG_KEY;
645  case MVIf_TAG:
646  case fVGT_TAG:
647  case MADm_TAG:
648  case MADe_TAG:
649  avio_seek(pb, -8, SEEK_CUR); // include chunk preamble
650  chunk_size += 8;
651  goto get_video_packet;
652 
653  case mTCD_TAG:
654  if (chunk_size < 8)
655  return AVERROR_INVALIDDATA;
656 
657  avio_skip(pb, 8); // skip ea DCT header
658  chunk_size -= 8;
659  goto get_video_packet;
660 
661  case MV0K_TAG:
662  case MPCh_TAG:
663  case pIQT_TAG:
664  key = AV_PKT_FLAG_KEY;
665  case MV0F_TAG:
666 get_video_packet:
667  if (!chunk_size)
668  continue;
669 
670  if (partial_packet) {
671  ret = av_append_packet(pb, pkt, chunk_size);
672  } else
673  ret = av_get_packet(pb, pkt, chunk_size);
674  if (ret < 0) {
675  packet_read = 1;
676  break;
677  }
678  partial_packet = chunk_type == MVIh_TAG;
679  pkt->stream_index = ea->video_stream_index;
680  pkt->flags |= key;
681  packet_read = 1;
682  break;
683 
684  default:
685  avio_skip(pb, chunk_size);
686  break;
687  }
688  }
689 
690  if (ret < 0 && partial_packet)
691  av_free_packet(pkt);
692  return ret;
693 }
694 
695 AVInputFormat ff_ea_demuxer = {
696  .name = "ea",
697  .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts Multimedia"),
698  .priv_data_size = sizeof(EaDemuxContext),
699  .read_probe = ea_probe,
700  .read_header = ea_read_header,
701  .read_packet = ea_read_packet,
702 };
Generated on Fri Dec 5 2014 04:42:11 for FFmpeg by   doxygen 1.8.2