1/* 2 * Monkey's Audio APE demuxer 3 * Copyright (c) 2007 Benjamin Zores <ben@geexbox.org> 4 * based upon libdemac from Dave Chapman. 5 * 6 * This file is part of FFmpeg. 7 * 8 * FFmpeg is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * FFmpeg is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with FFmpeg; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23#include <stdio.h> 24 25#include "libavutil/intreadwrite.h" 26#include "avformat.h" 27#include "internal.h" 28#include "apetag.h" 29 30/* The earliest and latest file formats supported by this library */ 31#define APE_MIN_VERSION 3800 32#define APE_MAX_VERSION 3990 33 34#define MAC_FORMAT_FLAG_8_BIT 1 // is 8-bit [OBSOLETE] 35#define MAC_FORMAT_FLAG_CRC 2 // uses the new CRC32 error detection [OBSOLETE] 36#define MAC_FORMAT_FLAG_HAS_PEAK_LEVEL 4 // uint32 nPeakLevel after the header [OBSOLETE] 37#define MAC_FORMAT_FLAG_24_BIT 8 // is 24-bit [OBSOLETE] 38#define MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS 16 // has the number of seek elements after the peak level 39#define MAC_FORMAT_FLAG_CREATE_WAV_HEADER 32 // create the wave header on decompression (not stored) 40 41#define APE_EXTRADATA_SIZE 6 42 43typedef struct { 44 int64_t pos; 45 int nblocks; 46 int size; 47 int skip; 48 int64_t pts; 49} APEFrame; 50 51typedef struct { 52 /* Derived fields */ 53 uint32_t junklength; 54 uint32_t firstframe; 55 uint32_t totalsamples; 56 int currentframe; 57 APEFrame *frames; 58 59 /* Info from Descriptor Block */ 60 char magic[4]; 61 int16_t fileversion; 62 int16_t padding1; 63 uint32_t descriptorlength; 64 uint32_t headerlength; 65 uint32_t seektablelength; 66 uint32_t wavheaderlength; 67 uint32_t audiodatalength; 68 uint32_t audiodatalength_high; 69 uint32_t wavtaillength; 70 uint8_t md5[16]; 71 72 /* Info from Header Block */ 73 uint16_t compressiontype; 74 uint16_t formatflags; 75 uint32_t blocksperframe; 76 uint32_t finalframeblocks; 77 uint32_t totalframes; 78 uint16_t bps; 79 uint16_t channels; 80 uint32_t samplerate; 81 82 /* Seektable */ 83 uint32_t *seektable; 84 uint8_t *bittable; 85} APEContext; 86 87static int ape_probe(AVProbeData * p) 88{ 89 int version = AV_RL16(p->buf+4); 90 if (AV_RL32(p->buf) != MKTAG('M', 'A', 'C', ' ')) 91 return 0; 92 93 if (version < APE_MIN_VERSION || version > APE_MAX_VERSION) 94 return AVPROBE_SCORE_MAX/4; 95 96 return AVPROBE_SCORE_MAX; 97} 98 99static void ape_dumpinfo(AVFormatContext * s, APEContext * ape_ctx) 100{ 101#ifdef DEBUG 102 int i; 103 104 av_log(s, AV_LOG_DEBUG, "Descriptor Block:\n\n"); 105 av_log(s, AV_LOG_DEBUG, "magic = \"%c%c%c%c\"\n", ape_ctx->magic[0], ape_ctx->magic[1], ape_ctx->magic[2], ape_ctx->magic[3]); 106 av_log(s, AV_LOG_DEBUG, "fileversion = %"PRId16"\n", ape_ctx->fileversion); 107 av_log(s, AV_LOG_DEBUG, "descriptorlength = %"PRIu32"\n", ape_ctx->descriptorlength); 108 av_log(s, AV_LOG_DEBUG, "headerlength = %"PRIu32"\n", ape_ctx->headerlength); 109 av_log(s, AV_LOG_DEBUG, "seektablelength = %"PRIu32"\n", ape_ctx->seektablelength); 110 av_log(s, AV_LOG_DEBUG, "wavheaderlength = %"PRIu32"\n", ape_ctx->wavheaderlength); 111 av_log(s, AV_LOG_DEBUG, "audiodatalength = %"PRIu32"\n", ape_ctx->audiodatalength); 112 av_log(s, AV_LOG_DEBUG, "audiodatalength_high = %"PRIu32"\n", ape_ctx->audiodatalength_high); 113 av_log(s, AV_LOG_DEBUG, "wavtaillength = %"PRIu32"\n", ape_ctx->wavtaillength); 114 av_log(s, AV_LOG_DEBUG, "md5 = "); 115 for (i = 0; i < 16; i++) 116 av_log(s, AV_LOG_DEBUG, "%02x", ape_ctx->md5[i]); 117 av_log(s, AV_LOG_DEBUG, "\n"); 118 119 av_log(s, AV_LOG_DEBUG, "\nHeader Block:\n\n"); 120 121 av_log(s, AV_LOG_DEBUG, "compressiontype = %"PRIu16"\n", ape_ctx->compressiontype); 122 av_log(s, AV_LOG_DEBUG, "formatflags = %"PRIu16"\n", ape_ctx->formatflags); 123 av_log(s, AV_LOG_DEBUG, "blocksperframe = %"PRIu32"\n", ape_ctx->blocksperframe); 124 av_log(s, AV_LOG_DEBUG, "finalframeblocks = %"PRIu32"\n", ape_ctx->finalframeblocks); 125 av_log(s, AV_LOG_DEBUG, "totalframes = %"PRIu32"\n", ape_ctx->totalframes); 126 av_log(s, AV_LOG_DEBUG, "bps = %"PRIu16"\n", ape_ctx->bps); 127 av_log(s, AV_LOG_DEBUG, "channels = %"PRIu16"\n", ape_ctx->channels); 128 av_log(s, AV_LOG_DEBUG, "samplerate = %"PRIu32"\n", ape_ctx->samplerate); 129 130 av_log(s, AV_LOG_DEBUG, "\nSeektable\n\n"); 131 if ((ape_ctx->seektablelength / sizeof(uint32_t)) != ape_ctx->totalframes) { 132 av_log(s, AV_LOG_DEBUG, "No seektable\n"); 133 } else { 134 for (i = 0; i < ape_ctx->seektablelength / sizeof(uint32_t); i++) { 135 if (i < ape_ctx->totalframes - 1) { 136 av_log(s, AV_LOG_DEBUG, "%8d %"PRIu32" (%"PRIu32" bytes)", 137 i, ape_ctx->seektable[i], 138 ape_ctx->seektable[i + 1] - ape_ctx->seektable[i]); 139 if (ape_ctx->bittable) 140 av_log(s, AV_LOG_DEBUG, " + %2d bits\n", 141 ape_ctx->bittable[i]); 142 av_log(s, AV_LOG_DEBUG, "\n"); 143 } else { 144 av_log(s, AV_LOG_DEBUG, "%8d %"PRIu32"\n", i, ape_ctx->seektable[i]); 145 } 146 } 147 } 148 149 av_log(s, AV_LOG_DEBUG, "\nFrames\n\n"); 150 for (i = 0; i < ape_ctx->totalframes; i++) 151 av_log(s, AV_LOG_DEBUG, "%8d %8"PRId64" %8d (%d samples)\n", i, 152 ape_ctx->frames[i].pos, ape_ctx->frames[i].size, 153 ape_ctx->frames[i].nblocks); 154 155 av_log(s, AV_LOG_DEBUG, "\nCalculated information:\n\n"); 156 av_log(s, AV_LOG_DEBUG, "junklength = %"PRIu32"\n", ape_ctx->junklength); 157 av_log(s, AV_LOG_DEBUG, "firstframe = %"PRIu32"\n", ape_ctx->firstframe); 158 av_log(s, AV_LOG_DEBUG, "totalsamples = %"PRIu32"\n", ape_ctx->totalsamples); 159#endif 160} 161 162static int ape_read_header(AVFormatContext * s) 163{ 164 AVIOContext *pb = s->pb; 165 APEContext *ape = s->priv_data; 166 AVStream *st; 167 uint32_t tag; 168 int i; 169 int total_blocks, final_size = 0; 170 int64_t pts, file_size; 171 172 /* Skip any leading junk such as id3v2 tags */ 173 ape->junklength = avio_tell(pb); 174 175 tag = avio_rl32(pb); 176 if (tag != MKTAG('M', 'A', 'C', ' ')) 177 return AVERROR_INVALIDDATA; 178 179 ape->fileversion = avio_rl16(pb); 180 181 if (ape->fileversion < APE_MIN_VERSION || ape->fileversion > APE_MAX_VERSION) { 182 av_log(s, AV_LOG_ERROR, "Unsupported file version - %d.%02d\n", 183 ape->fileversion / 1000, (ape->fileversion % 1000) / 10); 184 return AVERROR_PATCHWELCOME; 185 } 186 187 if (ape->fileversion >= 3980) { 188 ape->padding1 = avio_rl16(pb); 189 ape->descriptorlength = avio_rl32(pb); 190 ape->headerlength = avio_rl32(pb); 191 ape->seektablelength = avio_rl32(pb); 192 ape->wavheaderlength = avio_rl32(pb); 193 ape->audiodatalength = avio_rl32(pb); 194 ape->audiodatalength_high = avio_rl32(pb); 195 ape->wavtaillength = avio_rl32(pb); 196 avio_read(pb, ape->md5, 16); 197 198 /* Skip any unknown bytes at the end of the descriptor. 199 This is for future compatibility */ 200 if (ape->descriptorlength > 52) 201 avio_skip(pb, ape->descriptorlength - 52); 202 203 /* Read header data */ 204 ape->compressiontype = avio_rl16(pb); 205 ape->formatflags = avio_rl16(pb); 206 ape->blocksperframe = avio_rl32(pb); 207 ape->finalframeblocks = avio_rl32(pb); 208 ape->totalframes = avio_rl32(pb); 209 ape->bps = avio_rl16(pb); 210 ape->channels = avio_rl16(pb); 211 ape->samplerate = avio_rl32(pb); 212 } else { 213 ape->descriptorlength = 0; 214 ape->headerlength = 32; 215 216 ape->compressiontype = avio_rl16(pb); 217 ape->formatflags = avio_rl16(pb); 218 ape->channels = avio_rl16(pb); 219 ape->samplerate = avio_rl32(pb); 220 ape->wavheaderlength = avio_rl32(pb); 221 ape->wavtaillength = avio_rl32(pb); 222 ape->totalframes = avio_rl32(pb); 223 ape->finalframeblocks = avio_rl32(pb); 224 225 if (ape->formatflags & MAC_FORMAT_FLAG_HAS_PEAK_LEVEL) { 226 avio_skip(pb, 4); /* Skip the peak level */ 227 ape->headerlength += 4; 228 } 229 230 if (ape->formatflags & MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS) { 231 ape->seektablelength = avio_rl32(pb); 232 ape->headerlength += 4; 233 ape->seektablelength *= sizeof(int32_t); 234 } else 235 ape->seektablelength = ape->totalframes * sizeof(int32_t); 236 237 if (ape->formatflags & MAC_FORMAT_FLAG_8_BIT) 238 ape->bps = 8; 239 else if (ape->formatflags & MAC_FORMAT_FLAG_24_BIT) 240 ape->bps = 24; 241 else 242 ape->bps = 16; 243 244 if (ape->fileversion >= 3950) 245 ape->blocksperframe = 73728 * 4; 246 else if (ape->fileversion >= 3900 || (ape->fileversion >= 3800 && ape->compressiontype >= 4000)) 247 ape->blocksperframe = 73728; 248 else 249 ape->blocksperframe = 9216; 250 251 /* Skip any stored wav header */ 252 if (!(ape->formatflags & MAC_FORMAT_FLAG_CREATE_WAV_HEADER)) 253 avio_skip(pb, ape->wavheaderlength); 254 } 255 256 if(!ape->totalframes){ 257 av_log(s, AV_LOG_ERROR, "No frames in the file!\n"); 258 return AVERROR(EINVAL); 259 } 260 if(ape->totalframes > UINT_MAX / sizeof(APEFrame)){ 261 av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n", 262 ape->totalframes); 263 return AVERROR_INVALIDDATA; 264 } 265 if (ape->seektablelength / sizeof(*ape->seektable) < ape->totalframes) { 266 av_log(s, AV_LOG_ERROR, 267 "Number of seek entries is less than number of frames: %"SIZE_SPECIFIER" vs. %"PRIu32"\n", 268 ape->seektablelength / sizeof(*ape->seektable), ape->totalframes); 269 return AVERROR_INVALIDDATA; 270 } 271 ape->frames = av_malloc(ape->totalframes * sizeof(APEFrame)); 272 if(!ape->frames) 273 return AVERROR(ENOMEM); 274 ape->firstframe = ape->junklength + ape->descriptorlength + ape->headerlength + ape->seektablelength + ape->wavheaderlength; 275 if (ape->fileversion < 3810) 276 ape->firstframe += ape->totalframes; 277 ape->currentframe = 0; 278 279 280 ape->totalsamples = ape->finalframeblocks; 281 if (ape->totalframes > 1) 282 ape->totalsamples += ape->blocksperframe * (ape->totalframes - 1); 283 284 if (ape->seektablelength > 0) { 285 ape->seektable = av_mallocz(ape->seektablelength); 286 if (!ape->seektable) 287 return AVERROR(ENOMEM); 288 for (i = 0; i < ape->seektablelength / sizeof(uint32_t) && !pb->eof_reached; i++) 289 ape->seektable[i] = avio_rl32(pb); 290 if (ape->fileversion < 3810) { 291 ape->bittable = av_mallocz(ape->totalframes); 292 if (!ape->bittable) 293 return AVERROR(ENOMEM); 294 for (i = 0; i < ape->totalframes && !pb->eof_reached; i++) 295 ape->bittable[i] = avio_r8(pb); 296 } 297 if (pb->eof_reached) 298 av_log(s, AV_LOG_WARNING, "File truncated\n"); 299 } 300 301 ape->frames[0].pos = ape->firstframe; 302 ape->frames[0].nblocks = ape->blocksperframe; 303 ape->frames[0].skip = 0; 304 for (i = 1; i < ape->totalframes; i++) { 305 ape->frames[i].pos = ape->seektable[i] + ape->junklength; 306 ape->frames[i].nblocks = ape->blocksperframe; 307 ape->frames[i - 1].size = ape->frames[i].pos - ape->frames[i - 1].pos; 308 ape->frames[i].skip = (ape->frames[i].pos - ape->frames[0].pos) & 3; 309 } 310 ape->frames[ape->totalframes - 1].nblocks = ape->finalframeblocks; 311 /* calculate final packet size from total file size, if available */ 312 file_size = avio_size(pb); 313 if (file_size > 0) { 314 final_size = file_size - ape->frames[ape->totalframes - 1].pos - 315 ape->wavtaillength; 316 final_size -= final_size & 3; 317 } 318 if (file_size <= 0 || final_size <= 0) 319 final_size = ape->finalframeblocks * 8; 320 ape->frames[ape->totalframes - 1].size = final_size; 321 322 for (i = 0; i < ape->totalframes; i++) { 323 if(ape->frames[i].skip){ 324 ape->frames[i].pos -= ape->frames[i].skip; 325 ape->frames[i].size += ape->frames[i].skip; 326 } 327 ape->frames[i].size = (ape->frames[i].size + 3) & ~3; 328 } 329 if (ape->fileversion < 3810) { 330 for (i = 0; i < ape->totalframes; i++) { 331 if (i < ape->totalframes - 1 && ape->bittable[i + 1]) 332 ape->frames[i].size += 4; 333 ape->frames[i].skip <<= 3; 334 ape->frames[i].skip += ape->bittable[i]; 335 } 336 } 337 338 ape_dumpinfo(s, ape); 339 340 av_log(s, AV_LOG_DEBUG, "Decoding file - v%d.%02d, compression level %"PRIu16"\n", 341 ape->fileversion / 1000, (ape->fileversion % 1000) / 10, 342 ape->compressiontype); 343 344 /* now we are ready: build format streams */ 345 st = avformat_new_stream(s, NULL); 346 if (!st) 347 return AVERROR(ENOMEM); 348 349 total_blocks = (ape->totalframes == 0) ? 0 : ((ape->totalframes - 1) * ape->blocksperframe) + ape->finalframeblocks; 350 351 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 352 st->codec->codec_id = AV_CODEC_ID_APE; 353 st->codec->codec_tag = MKTAG('A', 'P', 'E', ' '); 354 st->codec->channels = ape->channels; 355 st->codec->sample_rate = ape->samplerate; 356 st->codec->bits_per_coded_sample = ape->bps; 357 358 st->nb_frames = ape->totalframes; 359 st->start_time = 0; 360 st->duration = total_blocks; 361 avpriv_set_pts_info(st, 64, 1, ape->samplerate); 362 363 if (ff_alloc_extradata(st->codec, APE_EXTRADATA_SIZE)) 364 return AVERROR(ENOMEM); 365 AV_WL16(st->codec->extradata + 0, ape->fileversion); 366 AV_WL16(st->codec->extradata + 2, ape->compressiontype); 367 AV_WL16(st->codec->extradata + 4, ape->formatflags); 368 369 pts = 0; 370 for (i = 0; i < ape->totalframes; i++) { 371 ape->frames[i].pts = pts; 372 av_add_index_entry(st, ape->frames[i].pos, ape->frames[i].pts, 0, 0, AVINDEX_KEYFRAME); 373 pts += ape->blocksperframe; 374 } 375 376 /* try to read APE tags */ 377 if (pb->seekable) { 378 ff_ape_parse_tag(s); 379 avio_seek(pb, 0, SEEK_SET); 380 } 381 382 return 0; 383} 384 385static int ape_read_packet(AVFormatContext * s, AVPacket * pkt) 386{ 387 int ret; 388 int nblocks; 389 APEContext *ape = s->priv_data; 390 uint32_t extra_size = 8; 391 392 if (url_feof(s->pb)) 393 return AVERROR_EOF; 394 if (ape->currentframe >= ape->totalframes) 395 return AVERROR_EOF; 396 397 if (avio_seek(s->pb, ape->frames[ape->currentframe].pos, SEEK_SET) < 0) 398 return AVERROR(EIO); 399 400 /* Calculate how many blocks there are in this frame */ 401 if (ape->currentframe == (ape->totalframes - 1)) 402 nblocks = ape->finalframeblocks; 403 else 404 nblocks = ape->blocksperframe; 405 406 if (ape->frames[ape->currentframe].size <= 0 || 407 ape->frames[ape->currentframe].size > INT_MAX - extra_size) { 408 av_log(s, AV_LOG_ERROR, "invalid packet size: %d\n", 409 ape->frames[ape->currentframe].size); 410 ape->currentframe++; 411 return AVERROR(EIO); 412 } 413 414 if (av_new_packet(pkt, ape->frames[ape->currentframe].size + extra_size) < 0) 415 return AVERROR(ENOMEM); 416 417 AV_WL32(pkt->data , nblocks); 418 AV_WL32(pkt->data + 4, ape->frames[ape->currentframe].skip); 419 ret = avio_read(s->pb, pkt->data + extra_size, ape->frames[ape->currentframe].size); 420 if (ret < 0) { 421 av_free_packet(pkt); 422 return ret; 423 } 424 425 pkt->pts = ape->frames[ape->currentframe].pts; 426 pkt->stream_index = 0; 427 428 /* note: we need to modify the packet size here to handle the last 429 packet */ 430 pkt->size = ret + extra_size; 431 432 ape->currentframe++; 433 434 return 0; 435} 436 437static int ape_read_close(AVFormatContext * s) 438{ 439 APEContext *ape = s->priv_data; 440 441 av_freep(&ape->frames); 442 av_freep(&ape->seektable); 443 av_freep(&ape->bittable); 444 return 0; 445} 446 447static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) 448{ 449 AVStream *st = s->streams[stream_index]; 450 APEContext *ape = s->priv_data; 451 int index = av_index_search_timestamp(st, timestamp, flags); 452 453 if (index < 0) 454 return -1; 455 456 if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0) 457 return -1; 458 ape->currentframe = index; 459 return 0; 460} 461 462AVInputFormat ff_ape_demuxer = { 463 .name = "ape", 464 .long_name = NULL_IF_CONFIG_SMALL("Monkey's Audio"), 465 .priv_data_size = sizeof(APEContext), 466 .read_probe = ape_probe, 467 .read_header = ape_read_header, 468 .read_packet = ape_read_packet, 469 .read_close = ape_read_close, 470 .read_seek = ape_read_seek, 471 .extensions = "ape,apl,mac", 472}; 473