| 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/channel_layout.h" |
| 36 | #include "libavutil/intreadwrite.h" |
| 37 | #include "avformat.h" |
| 38 | #include "internal.h" |
| 39 | |
| 40 | #define CHUNK_PREAMBLE_SIZE 4 |
| 41 | #define OPCODE_PREAMBLE_SIZE 4 |
| 42 | |
| 43 | #define CHUNK_INIT_AUDIO 0x0000 |
| 44 | #define CHUNK_AUDIO_ONLY 0x0001 |
| 45 | #define CHUNK_INIT_VIDEO 0x0002 |
| 46 | #define CHUNK_VIDEO 0x0003 |
| 47 | #define CHUNK_SHUTDOWN 0x0004 |
| 48 | #define CHUNK_END 0x0005 |
| 49 | /* these last types are used internally */ |
| 50 | #define CHUNK_DONE 0xFFFC |
| 51 | #define CHUNK_NOMEM 0xFFFD |
| 52 | #define CHUNK_EOF 0xFFFE |
| 53 | #define CHUNK_BAD 0xFFFF |
| 54 | |
| 55 | #define OPCODE_END_OF_STREAM 0x00 |
| 56 | #define OPCODE_END_OF_CHUNK 0x01 |
| 57 | #define OPCODE_CREATE_TIMER 0x02 |
| 58 | #define OPCODE_INIT_AUDIO_BUFFERS 0x03 |
| 59 | #define OPCODE_START_STOP_AUDIO 0x04 |
| 60 | #define OPCODE_INIT_VIDEO_BUFFERS 0x05 |
| 61 | #define OPCODE_UNKNOWN_06 0x06 |
| 62 | #define OPCODE_SEND_BUFFER 0x07 |
| 63 | #define OPCODE_AUDIO_FRAME 0x08 |
| 64 | #define OPCODE_SILENCE_FRAME 0x09 |
| 65 | #define OPCODE_INIT_VIDEO_MODE 0x0A |
| 66 | #define OPCODE_CREATE_GRADIENT 0x0B |
| 67 | #define OPCODE_SET_PALETTE 0x0C |
| 68 | #define OPCODE_SET_PALETTE_COMPRESSED 0x0D |
| 69 | #define OPCODE_UNKNOWN_0E 0x0E |
| 70 | #define OPCODE_SET_DECODING_MAP 0x0F |
| 71 | #define OPCODE_UNKNOWN_10 0x10 |
| 72 | #define OPCODE_VIDEO_DATA 0x11 |
| 73 | #define OPCODE_UNKNOWN_12 0x12 |
| 74 | #define OPCODE_UNKNOWN_13 0x13 |
| 75 | #define OPCODE_UNKNOWN_14 0x14 |
| 76 | #define OPCODE_UNKNOWN_15 0x15 |
| 77 | |
| 78 | #define PALETTE_COUNT 256 |
| 79 | |
| 80 | typedef struct IPMVEContext { |
| 81 | |
| 82 | unsigned char *buf; |
| 83 | int buf_size; |
| 84 | |
| 85 | uint64_t frame_pts_inc; |
| 86 | |
| 87 | unsigned int video_bpp; |
| 88 | unsigned int video_width; |
| 89 | unsigned int video_height; |
| 90 | int64_t video_pts; |
| 91 | uint32_t palette[256]; |
| 92 | int has_palette; |
| 93 | int changed; |
| 94 | |
| 95 | unsigned int audio_bits; |
| 96 | unsigned int audio_channels; |
| 97 | unsigned int audio_sample_rate; |
| 98 | enum AVCodecID audio_type; |
| 99 | unsigned int audio_frame_count; |
| 100 | |
| 101 | int video_stream_index; |
| 102 | int audio_stream_index; |
| 103 | |
| 104 | int64_t audio_chunk_offset; |
| 105 | int audio_chunk_size; |
| 106 | int64_t video_chunk_offset; |
| 107 | int video_chunk_size; |
| 108 | int64_t decode_map_chunk_offset; |
| 109 | int decode_map_chunk_size; |
| 110 | |
| 111 | int64_t next_chunk_offset; |
| 112 | |
| 113 | } IPMVEContext; |
| 114 | |
| 115 | static int load_ipmovie_packet(IPMVEContext *s, AVIOContext *pb, |
| 116 | AVPacket *pkt) { |
| 117 | |
| 118 | int chunk_type; |
| 119 | |
| 120 | if (s->audio_chunk_offset && s->audio_channels && s->audio_bits) { |
| 121 | if (s->audio_type == AV_CODEC_ID_NONE) { |
| 122 | av_log(NULL, AV_LOG_ERROR, "Can not read audio packet before" |
| 123 | "audio codec is known\n"); |
| 124 | return CHUNK_BAD; |
| 125 | } |
| 126 | |
| 127 | /* adjust for PCM audio by skipping chunk header */ |
| 128 | if (s->audio_type != AV_CODEC_ID_INTERPLAY_DPCM) { |
| 129 | s->audio_chunk_offset += 6; |
| 130 | s->audio_chunk_size -= 6; |
| 131 | } |
| 132 | |
| 133 | avio_seek(pb, s->audio_chunk_offset, SEEK_SET); |
| 134 | s->audio_chunk_offset = 0; |
| 135 | |
| 136 | if (s->audio_chunk_size != av_get_packet(pb, pkt, s->audio_chunk_size)) |
| 137 | return CHUNK_EOF; |
| 138 | |
| 139 | pkt->stream_index = s->audio_stream_index; |
| 140 | pkt->pts = s->audio_frame_count; |
| 141 | |
| 142 | /* audio frame maintenance */ |
| 143 | if (s->audio_type != AV_CODEC_ID_INTERPLAY_DPCM) |
| 144 | s->audio_frame_count += |
| 145 | (s->audio_chunk_size / s->audio_channels / (s->audio_bits / 8)); |
| 146 | else |
| 147 | s->audio_frame_count += |
| 148 | (s->audio_chunk_size - 6 - s->audio_channels) / s->audio_channels; |
| 149 | |
| 150 | av_dlog(NULL, "sending audio frame with pts %"PRId64" (%d audio frames)\n", |
| 151 | pkt->pts, s->audio_frame_count); |
| 152 | |
| 153 | chunk_type = CHUNK_VIDEO; |
| 154 | |
| 155 | } else if (s->decode_map_chunk_offset) { |
| 156 | |
| 157 | /* send both the decode map and the video data together */ |
| 158 | |
| 159 | if (av_new_packet(pkt, s->decode_map_chunk_size + s->video_chunk_size)) |
| 160 | return CHUNK_NOMEM; |
| 161 | |
| 162 | if (s->has_palette) { |
| 163 | uint8_t *pal; |
| 164 | |
| 165 | pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, |
| 166 | AVPALETTE_SIZE); |
| 167 | if (pal) { |
| 168 | memcpy(pal, s->palette, AVPALETTE_SIZE); |
| 169 | s->has_palette = 0; |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | if (s->changed) { |
| 174 | ff_add_param_change(pkt, 0, 0, 0, s->video_width, s->video_height); |
| 175 | s->changed = 0; |
| 176 | } |
| 177 | pkt->pos= s->decode_map_chunk_offset; |
| 178 | avio_seek(pb, s->decode_map_chunk_offset, SEEK_SET); |
| 179 | s->decode_map_chunk_offset = 0; |
| 180 | |
| 181 | if (avio_read(pb, pkt->data, s->decode_map_chunk_size) != |
| 182 | s->decode_map_chunk_size) { |
| 183 | av_free_packet(pkt); |
| 184 | return CHUNK_EOF; |
| 185 | } |
| 186 | |
| 187 | avio_seek(pb, s->video_chunk_offset, SEEK_SET); |
| 188 | s->video_chunk_offset = 0; |
| 189 | |
| 190 | if (avio_read(pb, pkt->data + s->decode_map_chunk_size, |
| 191 | s->video_chunk_size) != s->video_chunk_size) { |
| 192 | av_free_packet(pkt); |
| 193 | return CHUNK_EOF; |
| 194 | } |
| 195 | |
| 196 | pkt->stream_index = s->video_stream_index; |
| 197 | pkt->pts = s->video_pts; |
| 198 | |
| 199 | av_dlog(NULL, "sending video frame with pts %"PRId64"\n", pkt->pts); |
| 200 | |
| 201 | s->video_pts += s->frame_pts_inc; |
| 202 | |
| 203 | chunk_type = CHUNK_VIDEO; |
| 204 | |
| 205 | } else { |
| 206 | |
| 207 | avio_seek(pb, s->next_chunk_offset, SEEK_SET); |
| 208 | chunk_type = CHUNK_DONE; |
| 209 | |
| 210 | } |
| 211 | |
| 212 | return chunk_type; |
| 213 | } |
| 214 | |
| 215 | /* This function loads and processes a single chunk in an IP movie file. |
| 216 | * It returns the type of chunk that was processed. */ |
| 217 | static int process_ipmovie_chunk(IPMVEContext *s, AVIOContext *pb, |
| 218 | AVPacket *pkt) |
| 219 | { |
| 220 | unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE]; |
| 221 | int chunk_type; |
| 222 | int chunk_size; |
| 223 | unsigned char opcode_preamble[OPCODE_PREAMBLE_SIZE]; |
| 224 | unsigned char opcode_type; |
| 225 | unsigned char opcode_version; |
| 226 | int opcode_size; |
| 227 | unsigned char scratch[1024]; |
| 228 | int i, j; |
| 229 | int first_color, last_color; |
| 230 | int audio_flags; |
| 231 | unsigned char r, g, b; |
| 232 | unsigned int width, height; |
| 233 | |
| 234 | /* see if there are any pending packets */ |
| 235 | chunk_type = load_ipmovie_packet(s, pb, pkt); |
| 236 | if (chunk_type != CHUNK_DONE) |
| 237 | return chunk_type; |
| 238 | |
| 239 | /* read the next chunk, wherever the file happens to be pointing */ |
| 240 | if (avio_feof(pb)) |
| 241 | return CHUNK_EOF; |
| 242 | if (avio_read(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) != |
| 243 | CHUNK_PREAMBLE_SIZE) |
| 244 | return CHUNK_BAD; |
| 245 | chunk_size = AV_RL16(&chunk_preamble[0]); |
| 246 | chunk_type = AV_RL16(&chunk_preamble[2]); |
| 247 | |
| 248 | av_dlog(NULL, "chunk type 0x%04X, 0x%04X bytes: ", chunk_type, chunk_size); |
| 249 | |
| 250 | switch (chunk_type) { |
| 251 | |
| 252 | case CHUNK_INIT_AUDIO: |
| 253 | av_dlog(NULL, "initialize audio\n"); |
| 254 | break; |
| 255 | |
| 256 | case CHUNK_AUDIO_ONLY: |
| 257 | av_dlog(NULL, "audio only\n"); |
| 258 | break; |
| 259 | |
| 260 | case CHUNK_INIT_VIDEO: |
| 261 | av_dlog(NULL, "initialize video\n"); |
| 262 | break; |
| 263 | |
| 264 | case CHUNK_VIDEO: |
| 265 | av_dlog(NULL, "video (and audio)\n"); |
| 266 | break; |
| 267 | |
| 268 | case CHUNK_SHUTDOWN: |
| 269 | av_dlog(NULL, "shutdown\n"); |
| 270 | break; |
| 271 | |
| 272 | case CHUNK_END: |
| 273 | av_dlog(NULL, "end\n"); |
| 274 | break; |
| 275 | |
| 276 | default: |
| 277 | av_dlog(NULL, "invalid chunk\n"); |
| 278 | chunk_type = CHUNK_BAD; |
| 279 | break; |
| 280 | |
| 281 | } |
| 282 | |
| 283 | while ((chunk_size > 0) && (chunk_type != CHUNK_BAD)) { |
| 284 | |
| 285 | /* read the next chunk, wherever the file happens to be pointing */ |
| 286 | if (avio_feof(pb)) { |
| 287 | chunk_type = CHUNK_EOF; |
| 288 | break; |
| 289 | } |
| 290 | if (avio_read(pb, opcode_preamble, CHUNK_PREAMBLE_SIZE) != |
| 291 | CHUNK_PREAMBLE_SIZE) { |
| 292 | chunk_type = CHUNK_BAD; |
| 293 | break; |
| 294 | } |
| 295 | |
| 296 | opcode_size = AV_RL16(&opcode_preamble[0]); |
| 297 | opcode_type = opcode_preamble[2]; |
| 298 | opcode_version = opcode_preamble[3]; |
| 299 | |
| 300 | chunk_size -= OPCODE_PREAMBLE_SIZE; |
| 301 | chunk_size -= opcode_size; |
| 302 | if (chunk_size < 0) { |
| 303 | av_dlog(NULL, "chunk_size countdown just went negative\n"); |
| 304 | chunk_type = CHUNK_BAD; |
| 305 | break; |
| 306 | } |
| 307 | |
| 308 | av_dlog(NULL, " opcode type %02X, version %d, 0x%04X bytes: ", |
| 309 | opcode_type, opcode_version, opcode_size); |
| 310 | switch (opcode_type) { |
| 311 | |
| 312 | case OPCODE_END_OF_STREAM: |
| 313 | av_dlog(NULL, "end of stream\n"); |
| 314 | avio_skip(pb, opcode_size); |
| 315 | break; |
| 316 | |
| 317 | case OPCODE_END_OF_CHUNK: |
| 318 | av_dlog(NULL, "end of chunk\n"); |
| 319 | avio_skip(pb, opcode_size); |
| 320 | break; |
| 321 | |
| 322 | case OPCODE_CREATE_TIMER: |
| 323 | av_dlog(NULL, "create timer\n"); |
| 324 | if ((opcode_version > 0) || (opcode_size != 6)) { |
| 325 | av_dlog(NULL, "bad create_timer opcode\n"); |
| 326 | chunk_type = CHUNK_BAD; |
| 327 | break; |
| 328 | } |
| 329 | if (avio_read(pb, scratch, opcode_size) != |
| 330 | opcode_size) { |
| 331 | chunk_type = CHUNK_BAD; |
| 332 | break; |
| 333 | } |
| 334 | s->frame_pts_inc = ((uint64_t)AV_RL32(&scratch[0])) * AV_RL16(&scratch[4]); |
| 335 | av_dlog(NULL, " %.2f frames/second (timer div = %d, subdiv = %d)\n", |
| 336 | 1000000.0 / s->frame_pts_inc, AV_RL32(&scratch[0]), |
| 337 | AV_RL16(&scratch[4])); |
| 338 | break; |
| 339 | |
| 340 | case OPCODE_INIT_AUDIO_BUFFERS: |
| 341 | av_dlog(NULL, "initialize audio buffers\n"); |
| 342 | if (opcode_version > 1 || opcode_size > 10 || opcode_size < 6) { |
| 343 | av_dlog(NULL, "bad init_audio_buffers opcode\n"); |
| 344 | chunk_type = CHUNK_BAD; |
| 345 | break; |
| 346 | } |
| 347 | if (avio_read(pb, scratch, opcode_size) != |
| 348 | opcode_size) { |
| 349 | chunk_type = CHUNK_BAD; |
| 350 | break; |
| 351 | } |
| 352 | s->audio_sample_rate = AV_RL16(&scratch[4]); |
| 353 | audio_flags = AV_RL16(&scratch[2]); |
| 354 | /* bit 0 of the flags: 0 = mono, 1 = stereo */ |
| 355 | s->audio_channels = (audio_flags & 1) + 1; |
| 356 | /* bit 1 of the flags: 0 = 8 bit, 1 = 16 bit */ |
| 357 | s->audio_bits = (((audio_flags >> 1) & 1) + 1) * 8; |
| 358 | /* bit 2 indicates compressed audio in version 1 opcode */ |
| 359 | if ((opcode_version == 1) && (audio_flags & 0x4)) |
| 360 | s->audio_type = AV_CODEC_ID_INTERPLAY_DPCM; |
| 361 | else if (s->audio_bits == 16) |
| 362 | s->audio_type = AV_CODEC_ID_PCM_S16LE; |
| 363 | else |
| 364 | s->audio_type = AV_CODEC_ID_PCM_U8; |
| 365 | av_dlog(NULL, "audio: %d bits, %d Hz, %s, %s format\n", |
| 366 | s->audio_bits, s->audio_sample_rate, |
| 367 | (s->audio_channels == 2) ? "stereo" : "mono", |
| 368 | (s->audio_type == AV_CODEC_ID_INTERPLAY_DPCM) ? |
| 369 | "Interplay audio" : "PCM"); |
| 370 | break; |
| 371 | |
| 372 | case OPCODE_START_STOP_AUDIO: |
| 373 | av_dlog(NULL, "start/stop audio\n"); |
| 374 | avio_skip(pb, opcode_size); |
| 375 | break; |
| 376 | |
| 377 | case OPCODE_INIT_VIDEO_BUFFERS: |
| 378 | av_dlog(NULL, "initialize video buffers\n"); |
| 379 | if ((opcode_version > 2) || (opcode_size > 8) || opcode_size < 4 |
| 380 | || opcode_version == 2 && opcode_size < 8 |
| 381 | ) { |
| 382 | av_dlog(NULL, "bad init_video_buffers opcode\n"); |
| 383 | chunk_type = CHUNK_BAD; |
| 384 | break; |
| 385 | } |
| 386 | if (avio_read(pb, scratch, opcode_size) != |
| 387 | opcode_size) { |
| 388 | chunk_type = CHUNK_BAD; |
| 389 | break; |
| 390 | } |
| 391 | width = AV_RL16(&scratch[0]) * 8; |
| 392 | height = AV_RL16(&scratch[2]) * 8; |
| 393 | if (width != s->video_width) { |
| 394 | s->video_width = width; |
| 395 | s->changed++; |
| 396 | } |
| 397 | if (height != s->video_height) { |
| 398 | s->video_height = height; |
| 399 | s->changed++; |
| 400 | } |
| 401 | if (opcode_version < 2 || !AV_RL16(&scratch[6])) { |
| 402 | s->video_bpp = 8; |
| 403 | } else { |
| 404 | s->video_bpp = 16; |
| 405 | } |
| 406 | av_dlog(NULL, "video resolution: %d x %d\n", |
| 407 | s->video_width, s->video_height); |
| 408 | break; |
| 409 | |
| 410 | case OPCODE_UNKNOWN_06: |
| 411 | case OPCODE_UNKNOWN_0E: |
| 412 | case OPCODE_UNKNOWN_10: |
| 413 | case OPCODE_UNKNOWN_12: |
| 414 | case OPCODE_UNKNOWN_13: |
| 415 | case OPCODE_UNKNOWN_14: |
| 416 | case OPCODE_UNKNOWN_15: |
| 417 | av_dlog(NULL, "unknown (but documented) opcode %02X\n", opcode_type); |
| 418 | avio_skip(pb, opcode_size); |
| 419 | break; |
| 420 | |
| 421 | case OPCODE_SEND_BUFFER: |
| 422 | av_dlog(NULL, "send buffer\n"); |
| 423 | avio_skip(pb, opcode_size); |
| 424 | break; |
| 425 | |
| 426 | case OPCODE_AUDIO_FRAME: |
| 427 | av_dlog(NULL, "audio frame\n"); |
| 428 | |
| 429 | /* log position and move on for now */ |
| 430 | s->audio_chunk_offset = avio_tell(pb); |
| 431 | s->audio_chunk_size = opcode_size; |
| 432 | avio_skip(pb, opcode_size); |
| 433 | break; |
| 434 | |
| 435 | case OPCODE_SILENCE_FRAME: |
| 436 | av_dlog(NULL, "silence frame\n"); |
| 437 | avio_skip(pb, opcode_size); |
| 438 | break; |
| 439 | |
| 440 | case OPCODE_INIT_VIDEO_MODE: |
| 441 | av_dlog(NULL, "initialize video mode\n"); |
| 442 | avio_skip(pb, opcode_size); |
| 443 | break; |
| 444 | |
| 445 | case OPCODE_CREATE_GRADIENT: |
| 446 | av_dlog(NULL, "create gradient\n"); |
| 447 | avio_skip(pb, opcode_size); |
| 448 | break; |
| 449 | |
| 450 | case OPCODE_SET_PALETTE: |
| 451 | av_dlog(NULL, "set palette\n"); |
| 452 | /* check for the logical maximum palette size |
| 453 | * (3 * 256 + 4 bytes) */ |
| 454 | if (opcode_size > 0x304 || opcode_size < 4) { |
| 455 | av_dlog(NULL, "demux_ipmovie: set_palette opcode with invalid size\n"); |
| 456 | chunk_type = CHUNK_BAD; |
| 457 | break; |
| 458 | } |
| 459 | if (avio_read(pb, scratch, opcode_size) != opcode_size) { |
| 460 | chunk_type = CHUNK_BAD; |
| 461 | break; |
| 462 | } |
| 463 | |
| 464 | /* load the palette into internal data structure */ |
| 465 | first_color = AV_RL16(&scratch[0]); |
| 466 | last_color = first_color + AV_RL16(&scratch[2]) - 1; |
| 467 | /* sanity check (since they are 16 bit values) */ |
| 468 | if ( (first_color > 0xFF) || (last_color > 0xFF) |
| 469 | || (last_color - first_color + 1)*3 + 4 > opcode_size) { |
| 470 | av_dlog(NULL, "demux_ipmovie: set_palette indexes out of range (%d -> %d)\n", |
| 471 | first_color, last_color); |
| 472 | chunk_type = CHUNK_BAD; |
| 473 | break; |
| 474 | } |
| 475 | j = 4; /* offset of first palette data */ |
| 476 | for (i = first_color; i <= last_color; i++) { |
| 477 | /* the palette is stored as a 6-bit VGA palette, thus each |
| 478 | * component is shifted up to a 8-bit range */ |
| 479 | r = scratch[j++] * 4; |
| 480 | g = scratch[j++] * 4; |
| 481 | b = scratch[j++] * 4; |
| 482 | s->palette[i] = (0xFFU << 24) | (r << 16) | (g << 8) | (b); |
| 483 | s->palette[i] |= s->palette[i] >> 6 & 0x30303; |
| 484 | } |
| 485 | s->has_palette = 1; |
| 486 | break; |
| 487 | |
| 488 | case OPCODE_SET_PALETTE_COMPRESSED: |
| 489 | av_dlog(NULL, "set palette compressed\n"); |
| 490 | avio_skip(pb, opcode_size); |
| 491 | break; |
| 492 | |
| 493 | case OPCODE_SET_DECODING_MAP: |
| 494 | av_dlog(NULL, "set decoding map\n"); |
| 495 | |
| 496 | /* log position and move on for now */ |
| 497 | s->decode_map_chunk_offset = avio_tell(pb); |
| 498 | s->decode_map_chunk_size = opcode_size; |
| 499 | avio_skip(pb, opcode_size); |
| 500 | break; |
| 501 | |
| 502 | case OPCODE_VIDEO_DATA: |
| 503 | av_dlog(NULL, "set video data\n"); |
| 504 | |
| 505 | /* log position and move on for now */ |
| 506 | s->video_chunk_offset = avio_tell(pb); |
| 507 | s->video_chunk_size = opcode_size; |
| 508 | avio_skip(pb, opcode_size); |
| 509 | break; |
| 510 | |
| 511 | default: |
| 512 | av_dlog(NULL, "*** unknown opcode type\n"); |
| 513 | chunk_type = CHUNK_BAD; |
| 514 | break; |
| 515 | |
| 516 | } |
| 517 | } |
| 518 | |
| 519 | /* make a note of where the stream is sitting */ |
| 520 | s->next_chunk_offset = avio_tell(pb); |
| 521 | |
| 522 | /* dispatch the first of any pending packets */ |
| 523 | if ((chunk_type == CHUNK_VIDEO) || (chunk_type == CHUNK_AUDIO_ONLY)) |
| 524 | chunk_type = load_ipmovie_packet(s, pb, pkt); |
| 525 | |
| 526 | return chunk_type; |
| 527 | } |
| 528 | |
| 529 | static const char signature[] = "Interplay MVE File\x1A\0\x1A"; |
| 530 | |
| 531 | static int ipmovie_probe(AVProbeData *p) |
| 532 | { |
| 533 | const uint8_t *b = p->buf; |
| 534 | const uint8_t *b_end = p->buf + p->buf_size - sizeof(signature); |
| 535 | do { |
| 536 | if (b[0] == signature[0] && memcmp(b, signature, sizeof(signature)) == 0) |
| 537 | return AVPROBE_SCORE_MAX; |
| 538 | b++; |
| 539 | } while (b < b_end); |
| 540 | |
| 541 | return 0; |
| 542 | } |
| 543 | |
| 544 | static int ipmovie_read_header(AVFormatContext *s) |
| 545 | { |
| 546 | IPMVEContext *ipmovie = s->priv_data; |
| 547 | AVIOContext *pb = s->pb; |
| 548 | AVPacket pkt; |
| 549 | AVStream *st; |
| 550 | unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE]; |
| 551 | int chunk_type, i; |
| 552 | uint8_t signature_buffer[sizeof(signature)]; |
| 553 | |
| 554 | avio_read(pb, signature_buffer, sizeof(signature_buffer)); |
| 555 | while (memcmp(signature_buffer, signature, sizeof(signature))) { |
| 556 | memmove(signature_buffer, signature_buffer + 1, sizeof(signature_buffer) - 1); |
| 557 | signature_buffer[sizeof(signature_buffer) - 1] = avio_r8(pb); |
| 558 | if (avio_feof(pb)) |
| 559 | return AVERROR_EOF; |
| 560 | } |
| 561 | /* initialize private context members */ |
| 562 | ipmovie->video_pts = ipmovie->audio_frame_count = 0; |
| 563 | ipmovie->audio_chunk_offset = ipmovie->video_chunk_offset = |
| 564 | ipmovie->decode_map_chunk_offset = 0; |
| 565 | |
| 566 | /* on the first read, this will position the stream at the first chunk */ |
| 567 | ipmovie->next_chunk_offset = avio_tell(pb) + 4; |
| 568 | |
| 569 | for (i = 0; i < 256; i++) |
| 570 | ipmovie->palette[i] = 0xFFU << 24; |
| 571 | |
| 572 | /* process the first chunk which should be CHUNK_INIT_VIDEO */ |
| 573 | if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_VIDEO) |
| 574 | return AVERROR_INVALIDDATA; |
| 575 | |
| 576 | /* peek ahead to the next chunk-- if it is an init audio chunk, process |
| 577 | * it; if it is the first video chunk, this is a silent file */ |
| 578 | if (avio_read(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) != |
| 579 | CHUNK_PREAMBLE_SIZE) |
| 580 | return AVERROR(EIO); |
| 581 | chunk_type = AV_RL16(&chunk_preamble[2]); |
| 582 | avio_seek(pb, -CHUNK_PREAMBLE_SIZE, SEEK_CUR); |
| 583 | |
| 584 | if (chunk_type == CHUNK_VIDEO) |
| 585 | ipmovie->audio_type = AV_CODEC_ID_NONE; /* no audio */ |
| 586 | else if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_AUDIO) |
| 587 | return AVERROR_INVALIDDATA; |
| 588 | |
| 589 | /* initialize the stream decoders */ |
| 590 | st = avformat_new_stream(s, NULL); |
| 591 | if (!st) |
| 592 | return AVERROR(ENOMEM); |
| 593 | avpriv_set_pts_info(st, 63, 1, 1000000); |
| 594 | ipmovie->video_stream_index = st->index; |
| 595 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 596 | st->codec->codec_id = AV_CODEC_ID_INTERPLAY_VIDEO; |
| 597 | st->codec->codec_tag = 0; /* no fourcc */ |
| 598 | st->codec->width = ipmovie->video_width; |
| 599 | st->codec->height = ipmovie->video_height; |
| 600 | st->codec->bits_per_coded_sample = ipmovie->video_bpp; |
| 601 | |
| 602 | if (ipmovie->audio_type) { |
| 603 | st = avformat_new_stream(s, NULL); |
| 604 | if (!st) |
| 605 | return AVERROR(ENOMEM); |
| 606 | avpriv_set_pts_info(st, 32, 1, ipmovie->audio_sample_rate); |
| 607 | ipmovie->audio_stream_index = st->index; |
| 608 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| 609 | st->codec->codec_id = ipmovie->audio_type; |
| 610 | st->codec->codec_tag = 0; /* no tag */ |
| 611 | st->codec->channels = ipmovie->audio_channels; |
| 612 | st->codec->channel_layout = st->codec->channels == 1 ? AV_CH_LAYOUT_MONO : |
| 613 | AV_CH_LAYOUT_STEREO; |
| 614 | st->codec->sample_rate = ipmovie->audio_sample_rate; |
| 615 | st->codec->bits_per_coded_sample = ipmovie->audio_bits; |
| 616 | st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * |
| 617 | st->codec->bits_per_coded_sample; |
| 618 | if (st->codec->codec_id == AV_CODEC_ID_INTERPLAY_DPCM) |
| 619 | st->codec->bit_rate /= 2; |
| 620 | st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample; |
| 621 | } |
| 622 | |
| 623 | return 0; |
| 624 | } |
| 625 | |
| 626 | static int ipmovie_read_packet(AVFormatContext *s, |
| 627 | AVPacket *pkt) |
| 628 | { |
| 629 | IPMVEContext *ipmovie = s->priv_data; |
| 630 | AVIOContext *pb = s->pb; |
| 631 | int ret; |
| 632 | |
| 633 | for (;;) { |
| 634 | ret = process_ipmovie_chunk(ipmovie, pb, pkt); |
| 635 | if (ret == CHUNK_BAD) |
| 636 | ret = AVERROR_INVALIDDATA; |
| 637 | else if (ret == CHUNK_EOF) |
| 638 | ret = AVERROR(EIO); |
| 639 | else if (ret == CHUNK_NOMEM) |
| 640 | ret = AVERROR(ENOMEM); |
| 641 | else if (ret == CHUNK_VIDEO) |
| 642 | ret = 0; |
| 643 | else if (ret == CHUNK_INIT_VIDEO || ret == CHUNK_INIT_AUDIO) |
| 644 | continue; |
| 645 | else |
| 646 | ret = -1; |
| 647 | |
| 648 | return ret; |
| 649 | } |
| 650 | } |
| 651 | |
| 652 | AVInputFormat ff_ipmovie_demuxer = { |
| 653 | .name = "ipmovie", |
| 654 | .long_name = NULL_IF_CONFIG_SMALL("Interplay MVE"), |
| 655 | .priv_data_size = sizeof(IPMVEContext), |
| 656 | .read_probe = ipmovie_probe, |
| 657 | .read_header = ipmovie_read_header, |
| 658 | .read_packet = ipmovie_read_packet, |
| 659 | }; |