1/* 2 * Interplay MVE File Demuxer 3 * Copyright (c) 2003 The ffmpeg Project 4 * 5 * This file is part of Libav. 6 * 7 * Libav 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 * Libav 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 Libav; 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 * Interplay MVE file demuxer 25 * by Mike Melanson (melanson@pcisys.net) 26 * For more information regarding the Interplay MVE file format, visit: 27 * http://www.pcisys.net/~melanson/codecs/ 28 * The aforementioned site also contains a command line utility for parsing 29 * IP MVE files so that you can get a good idea of the typical structure of 30 * such files. This demuxer is not the best example to use if you are trying 31 * to write your own as it uses a rather roundabout approach for splitting 32 * up and sending out the chunks. 33 */ 34 35#include "libavutil/intreadwrite.h" 36#include "avformat.h" 37#include "internal.h" 38 39#define CHUNK_PREAMBLE_SIZE 4 40#define OPCODE_PREAMBLE_SIZE 4 41 42#define CHUNK_INIT_AUDIO 0x0000 43#define CHUNK_AUDIO_ONLY 0x0001 44#define CHUNK_INIT_VIDEO 0x0002 45#define CHUNK_VIDEO 0x0003 46#define CHUNK_SHUTDOWN 0x0004 47#define CHUNK_END 0x0005 48/* these last types are used internally */ 49#define CHUNK_DONE 0xFFFC 50#define CHUNK_NOMEM 0xFFFD 51#define CHUNK_EOF 0xFFFE 52#define CHUNK_BAD 0xFFFF 53 54#define OPCODE_END_OF_STREAM 0x00 55#define OPCODE_END_OF_CHUNK 0x01 56#define OPCODE_CREATE_TIMER 0x02 57#define OPCODE_INIT_AUDIO_BUFFERS 0x03 58#define OPCODE_START_STOP_AUDIO 0x04 59#define OPCODE_INIT_VIDEO_BUFFERS 0x05 60#define OPCODE_UNKNOWN_06 0x06 61#define OPCODE_SEND_BUFFER 0x07 62#define OPCODE_AUDIO_FRAME 0x08 63#define OPCODE_SILENCE_FRAME 0x09 64#define OPCODE_INIT_VIDEO_MODE 0x0A 65#define OPCODE_CREATE_GRADIENT 0x0B 66#define OPCODE_SET_PALETTE 0x0C 67#define OPCODE_SET_PALETTE_COMPRESSED 0x0D 68#define OPCODE_UNKNOWN_0E 0x0E 69#define OPCODE_SET_DECODING_MAP 0x0F 70#define OPCODE_UNKNOWN_10 0x10 71#define OPCODE_VIDEO_DATA 0x11 72#define OPCODE_UNKNOWN_12 0x12 73#define OPCODE_UNKNOWN_13 0x13 74#define OPCODE_UNKNOWN_14 0x14 75#define OPCODE_UNKNOWN_15 0x15 76 77#define PALETTE_COUNT 256 78 79typedef struct IPMVEContext { 80 81 unsigned char *buf; 82 int buf_size; 83 84 uint64_t frame_pts_inc; 85 86 unsigned int video_bpp; 87 unsigned int video_width; 88 unsigned int video_height; 89 int64_t video_pts; 90 uint32_t palette[256]; 91 int has_palette; 92 int changed; 93 94 unsigned int audio_bits; 95 unsigned int audio_channels; 96 unsigned int audio_sample_rate; 97 enum CodecID audio_type; 98 unsigned int audio_frame_count; 99 100 int video_stream_index; 101 int audio_stream_index; 102 103 int64_t audio_chunk_offset; 104 int audio_chunk_size; 105 int64_t video_chunk_offset; 106 int video_chunk_size; 107 int64_t decode_map_chunk_offset; 108 int decode_map_chunk_size; 109 110 int64_t next_chunk_offset; 111 112} IPMVEContext; 113 114static int load_ipmovie_packet(IPMVEContext *s, AVIOContext *pb, 115 AVPacket *pkt) { 116 117 int chunk_type; 118 119 if (s->audio_chunk_offset) { 120 if (s->audio_type == CODEC_ID_NONE) { 121 av_log(NULL, AV_LOG_ERROR, "Can not read audio packet before" 122 "audio codec is known\n"); 123 return CHUNK_BAD; 124 } 125 126 /* adjust for PCM audio by skipping chunk header */ 127 if (s->audio_type != CODEC_ID_INTERPLAY_DPCM) { 128 s->audio_chunk_offset += 6; 129 s->audio_chunk_size -= 6; 130 } 131 132 avio_seek(pb, s->audio_chunk_offset, SEEK_SET); 133 s->audio_chunk_offset = 0; 134 135 if (s->audio_chunk_size != av_get_packet(pb, pkt, s->audio_chunk_size)) 136 return CHUNK_EOF; 137 138 pkt->stream_index = s->audio_stream_index; 139 pkt->pts = s->audio_frame_count; 140 141 /* audio frame maintenance */ 142 if (s->audio_type != CODEC_ID_INTERPLAY_DPCM) 143 s->audio_frame_count += 144 (s->audio_chunk_size / s->audio_channels / (s->audio_bits / 8)); 145 else 146 s->audio_frame_count += 147 (s->audio_chunk_size - 6 - s->audio_channels) / s->audio_channels; 148 149 av_dlog(NULL, "sending audio frame with pts %"PRId64" (%d audio frames)\n", 150 pkt->pts, s->audio_frame_count); 151 152 chunk_type = CHUNK_VIDEO; 153 154 } else if (s->decode_map_chunk_offset) { 155 156 /* send both the decode map and the video data together */ 157 158 if (av_new_packet(pkt, s->decode_map_chunk_size + s->video_chunk_size)) 159 return CHUNK_NOMEM; 160 161 if (s->has_palette) { 162 uint8_t *pal; 163 164 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, 165 AVPALETTE_SIZE); 166 if (pal) { 167 memcpy(pal, s->palette, AVPALETTE_SIZE); 168 s->has_palette = 0; 169 } 170 } 171 172 if (s->changed) { 173 ff_add_param_change(pkt, 0, 0, 0, s->video_width, s->video_height); 174 s->changed = 0; 175 } 176 pkt->pos= s->decode_map_chunk_offset; 177 avio_seek(pb, s->decode_map_chunk_offset, SEEK_SET); 178 s->decode_map_chunk_offset = 0; 179 180 if (avio_read(pb, pkt->data, s->decode_map_chunk_size) != 181 s->decode_map_chunk_size) { 182 av_free_packet(pkt); 183 return CHUNK_EOF; 184 } 185 186 avio_seek(pb, s->video_chunk_offset, SEEK_SET); 187 s->video_chunk_offset = 0; 188 189 if (avio_read(pb, pkt->data + s->decode_map_chunk_size, 190 s->video_chunk_size) != s->video_chunk_size) { 191 av_free_packet(pkt); 192 return CHUNK_EOF; 193 } 194 195 pkt->stream_index = s->video_stream_index; 196 pkt->pts = s->video_pts; 197 198 av_dlog(NULL, "sending video frame with pts %"PRId64"\n", pkt->pts); 199 200 s->video_pts += s->frame_pts_inc; 201 202 chunk_type = CHUNK_VIDEO; 203 204 } else { 205 206 avio_seek(pb, s->next_chunk_offset, SEEK_SET); 207 chunk_type = CHUNK_DONE; 208 209 } 210 211 return chunk_type; 212} 213 214/* This function loads and processes a single chunk in an IP movie file. 215 * It returns the type of chunk that was processed. */ 216static int process_ipmovie_chunk(IPMVEContext *s, AVIOContext *pb, 217 AVPacket *pkt) 218{ 219 unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE]; 220 int chunk_type; 221 int chunk_size; 222 unsigned char opcode_preamble[OPCODE_PREAMBLE_SIZE]; 223 unsigned char opcode_type; 224 unsigned char opcode_version; 225 int opcode_size; 226 unsigned char scratch[1024]; 227 int i, j; 228 int first_color, last_color; 229 int audio_flags; 230 unsigned char r, g, b; 231 unsigned int width, height; 232 233 /* see if there are any pending packets */ 234 chunk_type = load_ipmovie_packet(s, pb, pkt); 235 if (chunk_type != CHUNK_DONE) 236 return chunk_type; 237 238 /* read the next chunk, wherever the file happens to be pointing */ 239 if (pb->eof_reached) 240 return CHUNK_EOF; 241 if (avio_read(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) != 242 CHUNK_PREAMBLE_SIZE) 243 return CHUNK_BAD; 244 chunk_size = AV_RL16(&chunk_preamble[0]); 245 chunk_type = AV_RL16(&chunk_preamble[2]); 246 247 av_dlog(NULL, "chunk type 0x%04X, 0x%04X bytes: ", chunk_type, chunk_size); 248 249 switch (chunk_type) { 250 251 case CHUNK_INIT_AUDIO: 252 av_dlog(NULL, "initialize audio\n"); 253 break; 254 255 case CHUNK_AUDIO_ONLY: 256 av_dlog(NULL, "audio only\n"); 257 break; 258 259 case CHUNK_INIT_VIDEO: 260 av_dlog(NULL, "initialize video\n"); 261 break; 262 263 case CHUNK_VIDEO: 264 av_dlog(NULL, "video (and audio)\n"); 265 break; 266 267 case CHUNK_SHUTDOWN: 268 av_dlog(NULL, "shutdown\n"); 269 break; 270 271 case CHUNK_END: 272 av_dlog(NULL, "end\n"); 273 break; 274 275 default: 276 av_dlog(NULL, "invalid chunk\n"); 277 chunk_type = CHUNK_BAD; 278 break; 279 280 } 281 282 while ((chunk_size > 0) && (chunk_type != CHUNK_BAD)) { 283 284 /* read the next chunk, wherever the file happens to be pointing */ 285 if (pb->eof_reached) { 286 chunk_type = CHUNK_EOF; 287 break; 288 } 289 if (avio_read(pb, opcode_preamble, CHUNK_PREAMBLE_SIZE) != 290 CHUNK_PREAMBLE_SIZE) { 291 chunk_type = CHUNK_BAD; 292 break; 293 } 294 295 opcode_size = AV_RL16(&opcode_preamble[0]); 296 opcode_type = opcode_preamble[2]; 297 opcode_version = opcode_preamble[3]; 298 299 chunk_size -= OPCODE_PREAMBLE_SIZE; 300 chunk_size -= opcode_size; 301 if (chunk_size < 0) { 302 av_dlog(NULL, "chunk_size countdown just went negative\n"); 303 chunk_type = CHUNK_BAD; 304 break; 305 } 306 307 av_dlog(NULL, " opcode type %02X, version %d, 0x%04X bytes: ", 308 opcode_type, opcode_version, opcode_size); 309 switch (opcode_type) { 310 311 case OPCODE_END_OF_STREAM: 312 av_dlog(NULL, "end of stream\n"); 313 avio_skip(pb, opcode_size); 314 break; 315 316 case OPCODE_END_OF_CHUNK: 317 av_dlog(NULL, "end of chunk\n"); 318 avio_skip(pb, opcode_size); 319 break; 320 321 case OPCODE_CREATE_TIMER: 322 av_dlog(NULL, "create timer\n"); 323 if ((opcode_version > 0) || (opcode_size > 6)) { 324 av_dlog(NULL, "bad create_timer opcode\n"); 325 chunk_type = CHUNK_BAD; 326 break; 327 } 328 if (avio_read(pb, scratch, opcode_size) != 329 opcode_size) { 330 chunk_type = CHUNK_BAD; 331 break; 332 } 333 s->frame_pts_inc = ((uint64_t)AV_RL32(&scratch[0])) * AV_RL16(&scratch[4]); 334 av_dlog(NULL, " %.2f frames/second (timer div = %d, subdiv = %d)\n", 335 1000000.0 / s->frame_pts_inc, AV_RL32(&scratch[0]), 336 AV_RL16(&scratch[4])); 337 break; 338 339 case OPCODE_INIT_AUDIO_BUFFERS: 340 av_dlog(NULL, "initialize audio buffers\n"); 341 if ((opcode_version > 1) || (opcode_size > 10)) { 342 av_dlog(NULL, "bad init_audio_buffers opcode\n"); 343 chunk_type = CHUNK_BAD; 344 break; 345 } 346 if (avio_read(pb, scratch, opcode_size) != 347 opcode_size) { 348 chunk_type = CHUNK_BAD; 349 break; 350 } 351 s->audio_sample_rate = AV_RL16(&scratch[4]); 352 audio_flags = AV_RL16(&scratch[2]); 353 /* bit 0 of the flags: 0 = mono, 1 = stereo */ 354 s->audio_channels = (audio_flags & 1) + 1; 355 /* bit 1 of the flags: 0 = 8 bit, 1 = 16 bit */ 356 s->audio_bits = (((audio_flags >> 1) & 1) + 1) * 8; 357 /* bit 2 indicates compressed audio in version 1 opcode */ 358 if ((opcode_version == 1) && (audio_flags & 0x4)) 359 s->audio_type = CODEC_ID_INTERPLAY_DPCM; 360 else if (s->audio_bits == 16) 361 s->audio_type = CODEC_ID_PCM_S16LE; 362 else 363 s->audio_type = CODEC_ID_PCM_U8; 364 av_dlog(NULL, "audio: %d bits, %d Hz, %s, %s format\n", 365 s->audio_bits, s->audio_sample_rate, 366 (s->audio_channels == 2) ? "stereo" : "mono", 367 (s->audio_type == CODEC_ID_INTERPLAY_DPCM) ? 368 "Interplay audio" : "PCM"); 369 break; 370 371 case OPCODE_START_STOP_AUDIO: 372 av_dlog(NULL, "start/stop audio\n"); 373 avio_skip(pb, opcode_size); 374 break; 375 376 case OPCODE_INIT_VIDEO_BUFFERS: 377 av_dlog(NULL, "initialize video buffers\n"); 378 if ((opcode_version > 2) || (opcode_size > 8)) { 379 av_dlog(NULL, "bad init_video_buffers opcode\n"); 380 chunk_type = CHUNK_BAD; 381 break; 382 } 383 if (avio_read(pb, scratch, opcode_size) != 384 opcode_size) { 385 chunk_type = CHUNK_BAD; 386 break; 387 } 388 width = AV_RL16(&scratch[0]) * 8; 389 height = AV_RL16(&scratch[2]) * 8; 390 if (width != s->video_width) { 391 s->video_width = width; 392 s->changed++; 393 } 394 if (height != s->video_height) { 395 s->video_height = height; 396 s->changed++; 397 } 398 if (opcode_version < 2 || !AV_RL16(&scratch[6])) { 399 s->video_bpp = 8; 400 } else { 401 s->video_bpp = 16; 402 } 403 av_dlog(NULL, "video resolution: %d x %d\n", 404 s->video_width, s->video_height); 405 break; 406 407 case OPCODE_UNKNOWN_06: 408 case OPCODE_UNKNOWN_0E: 409 case OPCODE_UNKNOWN_10: 410 case OPCODE_UNKNOWN_12: 411 case OPCODE_UNKNOWN_13: 412 case OPCODE_UNKNOWN_14: 413 case OPCODE_UNKNOWN_15: 414 av_dlog(NULL, "unknown (but documented) opcode %02X\n", opcode_type); 415 avio_skip(pb, opcode_size); 416 break; 417 418 case OPCODE_SEND_BUFFER: 419 av_dlog(NULL, "send buffer\n"); 420 avio_skip(pb, opcode_size); 421 break; 422 423 case OPCODE_AUDIO_FRAME: 424 av_dlog(NULL, "audio frame\n"); 425 426 /* log position and move on for now */ 427 s->audio_chunk_offset = avio_tell(pb); 428 s->audio_chunk_size = opcode_size; 429 avio_skip(pb, opcode_size); 430 break; 431 432 case OPCODE_SILENCE_FRAME: 433 av_dlog(NULL, "silence frame\n"); 434 avio_skip(pb, opcode_size); 435 break; 436 437 case OPCODE_INIT_VIDEO_MODE: 438 av_dlog(NULL, "initialize video mode\n"); 439 avio_skip(pb, opcode_size); 440 break; 441 442 case OPCODE_CREATE_GRADIENT: 443 av_dlog(NULL, "create gradient\n"); 444 avio_skip(pb, opcode_size); 445 break; 446 447 case OPCODE_SET_PALETTE: 448 av_dlog(NULL, "set palette\n"); 449 /* check for the logical maximum palette size 450 * (3 * 256 + 4 bytes) */ 451 if (opcode_size > 0x304) { 452 av_dlog(NULL, "demux_ipmovie: set_palette opcode too large\n"); 453 chunk_type = CHUNK_BAD; 454 break; 455 } 456 if (avio_read(pb, scratch, opcode_size) != opcode_size) { 457 chunk_type = CHUNK_BAD; 458 break; 459 } 460 461 /* load the palette into internal data structure */ 462 first_color = AV_RL16(&scratch[0]); 463 last_color = first_color + AV_RL16(&scratch[2]) - 1; 464 /* sanity check (since they are 16 bit values) */ 465 if ((first_color > 0xFF) || (last_color > 0xFF)) { 466 av_dlog(NULL, "demux_ipmovie: set_palette indexes out of range (%d -> %d)\n", 467 first_color, last_color); 468 chunk_type = CHUNK_BAD; 469 break; 470 } 471 j = 4; /* offset of first palette data */ 472 for (i = first_color; i <= last_color; i++) { 473 /* the palette is stored as a 6-bit VGA palette, thus each 474 * component is shifted up to a 8-bit range */ 475 r = scratch[j++] * 4; 476 g = scratch[j++] * 4; 477 b = scratch[j++] * 4; 478 s->palette[i] = (r << 16) | (g << 8) | (b); 479 } 480 s->has_palette = 1; 481 break; 482 483 case OPCODE_SET_PALETTE_COMPRESSED: 484 av_dlog(NULL, "set palette compressed\n"); 485 avio_skip(pb, opcode_size); 486 break; 487 488 case OPCODE_SET_DECODING_MAP: 489 av_dlog(NULL, "set decoding map\n"); 490 491 /* log position and move on for now */ 492 s->decode_map_chunk_offset = avio_tell(pb); 493 s->decode_map_chunk_size = opcode_size; 494 avio_skip(pb, opcode_size); 495 break; 496 497 case OPCODE_VIDEO_DATA: 498 av_dlog(NULL, "set video data\n"); 499 500 /* log position and move on for now */ 501 s->video_chunk_offset = avio_tell(pb); 502 s->video_chunk_size = opcode_size; 503 avio_skip(pb, opcode_size); 504 break; 505 506 default: 507 av_dlog(NULL, "*** unknown opcode type\n"); 508 chunk_type = CHUNK_BAD; 509 break; 510 511 } 512 } 513 514 /* make a note of where the stream is sitting */ 515 s->next_chunk_offset = avio_tell(pb); 516 517 /* dispatch the first of any pending packets */ 518 if ((chunk_type == CHUNK_VIDEO) || (chunk_type == CHUNK_AUDIO_ONLY)) 519 chunk_type = load_ipmovie_packet(s, pb, pkt); 520 521 return chunk_type; 522} 523 524static const char signature[] = "Interplay MVE File\x1A\0\x1A"; 525 526static int ipmovie_probe(AVProbeData *p) 527{ 528 uint8_t *b = p->buf; 529 uint8_t *b_end = p->buf + p->buf_size - sizeof(signature); 530 do { 531 if (memcmp(b++, signature, sizeof(signature)) == 0) 532 return AVPROBE_SCORE_MAX; 533 } while (b < b_end); 534 535 return 0; 536} 537 538static int ipmovie_read_header(AVFormatContext *s, 539 AVFormatParameters *ap) 540{ 541 IPMVEContext *ipmovie = s->priv_data; 542 AVIOContext *pb = s->pb; 543 AVPacket pkt; 544 AVStream *st; 545 unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE]; 546 int chunk_type; 547 uint8_t signature_buffer[sizeof(signature)]; 548 549 avio_read(pb, signature_buffer, sizeof(signature_buffer)); 550 while (memcmp(signature_buffer, signature, sizeof(signature))) { 551 memmove(signature_buffer, signature_buffer + 1, sizeof(signature_buffer) - 1); 552 signature_buffer[sizeof(signature_buffer) - 1] = avio_r8(pb); 553 if (pb->eof_reached) 554 return AVERROR_EOF; 555 } 556 /* initialize private context members */ 557 ipmovie->video_pts = ipmovie->audio_frame_count = 0; 558 ipmovie->audio_chunk_offset = ipmovie->video_chunk_offset = 559 ipmovie->decode_map_chunk_offset = 0; 560 561 /* on the first read, this will position the stream at the first chunk */ 562 ipmovie->next_chunk_offset = avio_tell(pb) + 4; 563 564 /* process the first chunk which should be CHUNK_INIT_VIDEO */ 565 if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_VIDEO) 566 return AVERROR_INVALIDDATA; 567 568 /* peek ahead to the next chunk-- if it is an init audio chunk, process 569 * it; if it is the first video chunk, this is a silent file */ 570 if (avio_read(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) != 571 CHUNK_PREAMBLE_SIZE) 572 return AVERROR(EIO); 573 chunk_type = AV_RL16(&chunk_preamble[2]); 574 avio_seek(pb, -CHUNK_PREAMBLE_SIZE, SEEK_CUR); 575 576 if (chunk_type == CHUNK_VIDEO) 577 ipmovie->audio_type = CODEC_ID_NONE; /* no audio */ 578 else if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_AUDIO) 579 return AVERROR_INVALIDDATA; 580 581 /* initialize the stream decoders */ 582 st = avformat_new_stream(s, NULL); 583 if (!st) 584 return AVERROR(ENOMEM); 585 avpriv_set_pts_info(st, 63, 1, 1000000); 586 ipmovie->video_stream_index = st->index; 587 st->codec->codec_type = AVMEDIA_TYPE_VIDEO; 588 st->codec->codec_id = CODEC_ID_INTERPLAY_VIDEO; 589 st->codec->codec_tag = 0; /* no fourcc */ 590 st->codec->width = ipmovie->video_width; 591 st->codec->height = ipmovie->video_height; 592 st->codec->bits_per_coded_sample = ipmovie->video_bpp; 593 594 if (ipmovie->audio_type) { 595 st = avformat_new_stream(s, NULL); 596 if (!st) 597 return AVERROR(ENOMEM); 598 avpriv_set_pts_info(st, 32, 1, ipmovie->audio_sample_rate); 599 ipmovie->audio_stream_index = st->index; 600 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 601 st->codec->codec_id = ipmovie->audio_type; 602 st->codec->codec_tag = 0; /* no tag */ 603 st->codec->channels = ipmovie->audio_channels; 604 st->codec->sample_rate = ipmovie->audio_sample_rate; 605 st->codec->bits_per_coded_sample = ipmovie->audio_bits; 606 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * 607 st->codec->bits_per_coded_sample; 608 if (st->codec->codec_id == CODEC_ID_INTERPLAY_DPCM) 609 st->codec->bit_rate /= 2; 610 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample; 611 } 612 613 return 0; 614} 615 616static int ipmovie_read_packet(AVFormatContext *s, 617 AVPacket *pkt) 618{ 619 IPMVEContext *ipmovie = s->priv_data; 620 AVIOContext *pb = s->pb; 621 int ret; 622 623 ret = process_ipmovie_chunk(ipmovie, pb, pkt); 624 if (ret == CHUNK_BAD) 625 ret = AVERROR_INVALIDDATA; 626 else if (ret == CHUNK_EOF) 627 ret = AVERROR(EIO); 628 else if (ret == CHUNK_NOMEM) 629 ret = AVERROR(ENOMEM); 630 else if (ret == CHUNK_VIDEO) 631 ret = 0; 632 else 633 ret = -1; 634 635 return ret; 636} 637 638AVInputFormat ff_ipmovie_demuxer = { 639 .name = "ipmovie", 640 .long_name = NULL_IF_CONFIG_SMALL("Interplay MVE format"), 641 .priv_data_size = sizeof(IPMVEContext), 642 .read_probe = ipmovie_probe, 643 .read_header = ipmovie_read_header, 644 .read_packet = ipmovie_read_packet, 645}; 646