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