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 APEFrame { 44 int64_t pos; 45 int64_t size; 46 int nblocks; 47 int skip; 48 int64_t pts; 49} APEFrame; 50 51typedef struct APEContext { 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 int16_t fileversion; 61 int16_t padding1; 62 uint32_t descriptorlength; 63 uint32_t headerlength; 64 uint32_t seektablelength; 65 uint32_t wavheaderlength; 66 uint32_t audiodatalength; 67 uint32_t audiodatalength_high; 68 uint32_t wavtaillength; 69 uint8_t md5[16]; 70 71 /* Info from Header Block */ 72 uint16_t compressiontype; 73 uint16_t formatflags; 74 uint32_t blocksperframe; 75 uint32_t finalframeblocks; 76 uint32_t totalframes; 77 uint16_t bps; 78 uint16_t channels; 79 uint32_t samplerate; 80} APEContext; 81 82static int ape_probe(const AVProbeData * p) 83{ 84 int version = AV_RL16(p->buf+4); 85 if (AV_RL32(p->buf) != MKTAG('M', 'A', 'C', ' ')) 86 return 0; 87 88 if (version < APE_MIN_VERSION || version > APE_MAX_VERSION) 89 return AVPROBE_SCORE_MAX/4; 90 91 return AVPROBE_SCORE_MAX; 92} 93 94static void ape_dumpinfo(AVFormatContext * s, APEContext * ape_ctx) 95{ 96#ifdef DEBUG 97 int i; 98 99 av_log(s, AV_LOG_DEBUG, "Descriptor Block:\n\n"); 100 av_log(s, AV_LOG_DEBUG, "fileversion = %"PRId16"\n", ape_ctx->fileversion); 101 av_log(s, AV_LOG_DEBUG, "descriptorlength = %"PRIu32"\n", ape_ctx->descriptorlength); 102 av_log(s, AV_LOG_DEBUG, "headerlength = %"PRIu32"\n", ape_ctx->headerlength); 103 av_log(s, AV_LOG_DEBUG, "seektablelength = %"PRIu32"\n", ape_ctx->seektablelength); 104 av_log(s, AV_LOG_DEBUG, "wavheaderlength = %"PRIu32"\n", ape_ctx->wavheaderlength); 105 av_log(s, AV_LOG_DEBUG, "audiodatalength = %"PRIu32"\n", ape_ctx->audiodatalength); 106 av_log(s, AV_LOG_DEBUG, "audiodatalength_high = %"PRIu32"\n", ape_ctx->audiodatalength_high); 107 av_log(s, AV_LOG_DEBUG, "wavtaillength = %"PRIu32"\n", ape_ctx->wavtaillength); 108 av_log(s, AV_LOG_DEBUG, "md5 = "); 109 for (i = 0; i < 16; i++) 110 av_log(s, AV_LOG_DEBUG, "%02x", ape_ctx->md5[i]); 111 av_log(s, AV_LOG_DEBUG, "\n"); 112 113 av_log(s, AV_LOG_DEBUG, "\nHeader Block:\n\n"); 114 115 av_log(s, AV_LOG_DEBUG, "compressiontype = %"PRIu16"\n", ape_ctx->compressiontype); 116 av_log(s, AV_LOG_DEBUG, "formatflags = %"PRIu16"\n", ape_ctx->formatflags); 117 av_log(s, AV_LOG_DEBUG, "blocksperframe = %"PRIu32"\n", ape_ctx->blocksperframe); 118 av_log(s, AV_LOG_DEBUG, "finalframeblocks = %"PRIu32"\n", ape_ctx->finalframeblocks); 119 av_log(s, AV_LOG_DEBUG, "totalframes = %"PRIu32"\n", ape_ctx->totalframes); 120 av_log(s, AV_LOG_DEBUG, "bps = %"PRIu16"\n", ape_ctx->bps); 121 av_log(s, AV_LOG_DEBUG, "channels = %"PRIu16"\n", ape_ctx->channels); 122 av_log(s, AV_LOG_DEBUG, "samplerate = %"PRIu32"\n", ape_ctx->samplerate); 123 124 av_log(s, AV_LOG_DEBUG, "\nSeektable\n\n"); 125 if ((ape_ctx->seektablelength / sizeof(uint32_t)) != ape_ctx->totalframes) { 126 av_log(s, AV_LOG_DEBUG, "No seektable\n"); 127 } 128 129 av_log(s, AV_LOG_DEBUG, "\nFrames\n\n"); 130 for (i = 0; i < ape_ctx->totalframes; i++) 131 av_log(s, AV_LOG_DEBUG, "%8d %8"PRId64" %8"PRId64" (%d samples)\n", i, 132 ape_ctx->frames[i].pos, ape_ctx->frames[i].size, 133 ape_ctx->frames[i].nblocks); 134 135 av_log(s, AV_LOG_DEBUG, "\nCalculated information:\n\n"); 136 av_log(s, AV_LOG_DEBUG, "junklength = %"PRIu32"\n", ape_ctx->junklength); 137 av_log(s, AV_LOG_DEBUG, "firstframe = %"PRIu32"\n", ape_ctx->firstframe); 138 av_log(s, AV_LOG_DEBUG, "totalsamples = %"PRIu32"\n", ape_ctx->totalsamples); 139#endif 140} 141 142static int ape_read_header(AVFormatContext * s) 143{ 144 AVIOContext *pb = s->pb; 145 APEContext *ape = s->priv_data; 146 AVStream *st; 147 uint32_t tag; 148 int i, ret; 149 int total_blocks; 150 int64_t final_size = 0; 151 int64_t pts, file_size; 152 153 /* Skip any leading junk such as id3v2 tags */ 154 ape->junklength = avio_tell(pb); 155 156 tag = avio_rl32(pb); 157 if (tag != MKTAG('M', 'A', 'C', ' ')) 158 return AVERROR_INVALIDDATA; 159 160 ape->fileversion = avio_rl16(pb); 161 162 if (ape->fileversion < APE_MIN_VERSION || ape->fileversion > APE_MAX_VERSION) { 163 av_log(s, AV_LOG_ERROR, "Unsupported file version - %d.%02d\n", 164 ape->fileversion / 1000, (ape->fileversion % 1000) / 10); 165 return AVERROR_PATCHWELCOME; 166 } 167 168 if (ape->fileversion >= 3980) { 169 ape->padding1 = avio_rl16(pb); 170 ape->descriptorlength = avio_rl32(pb); 171 ape->headerlength = avio_rl32(pb); 172 ape->seektablelength = avio_rl32(pb); 173 ape->wavheaderlength = avio_rl32(pb); 174 ape->audiodatalength = avio_rl32(pb); 175 ape->audiodatalength_high = avio_rl32(pb); 176 ape->wavtaillength = avio_rl32(pb); 177 avio_read(pb, ape->md5, 16); 178 179 /* Skip any unknown bytes at the end of the descriptor. 180 This is for future compatibility */ 181 if (ape->descriptorlength > 52) 182 avio_skip(pb, ape->descriptorlength - 52); 183 184 /* Read header data */ 185 ape->compressiontype = avio_rl16(pb); 186 ape->formatflags = avio_rl16(pb); 187 ape->blocksperframe = avio_rl32(pb); 188 ape->finalframeblocks = avio_rl32(pb); 189 ape->totalframes = avio_rl32(pb); 190 ape->bps = avio_rl16(pb); 191 ape->channels = avio_rl16(pb); 192 ape->samplerate = avio_rl32(pb); 193 } else { 194 ape->descriptorlength = 0; 195 ape->headerlength = 32; 196 197 ape->compressiontype = avio_rl16(pb); 198 ape->formatflags = avio_rl16(pb); 199 ape->channels = avio_rl16(pb); 200 ape->samplerate = avio_rl32(pb); 201 ape->wavheaderlength = avio_rl32(pb); 202 ape->wavtaillength = avio_rl32(pb); 203 ape->totalframes = avio_rl32(pb); 204 ape->finalframeblocks = avio_rl32(pb); 205 206 if (ape->formatflags & MAC_FORMAT_FLAG_HAS_PEAK_LEVEL) { 207 avio_skip(pb, 4); /* Skip the peak level */ 208 ape->headerlength += 4; 209 } 210 211 if (ape->formatflags & MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS) { 212 ape->seektablelength = avio_rl32(pb); 213 ape->headerlength += 4; 214 ape->seektablelength *= sizeof(int32_t); 215 } else 216 ape->seektablelength = ape->totalframes * sizeof(int32_t); 217 218 if (ape->formatflags & MAC_FORMAT_FLAG_8_BIT) 219 ape->bps = 8; 220 else if (ape->formatflags & MAC_FORMAT_FLAG_24_BIT) 221 ape->bps = 24; 222 else 223 ape->bps = 16; 224 225 if (ape->fileversion >= 3950) 226 ape->blocksperframe = 73728 * 4; 227 else if (ape->fileversion >= 3900 || (ape->fileversion >= 3800 && ape->compressiontype >= 4000)) 228 ape->blocksperframe = 73728; 229 else 230 ape->blocksperframe = 9216; 231 232 /* Skip any stored wav header */ 233 if (!(ape->formatflags & MAC_FORMAT_FLAG_CREATE_WAV_HEADER)) 234 avio_skip(pb, ape->wavheaderlength); 235 } 236 237 if(!ape->totalframes || pb->eof_reached){ 238 av_log(s, AV_LOG_ERROR, "No frames in the file!\n"); 239 return AVERROR(EINVAL); 240 } 241 if(ape->totalframes > UINT_MAX / sizeof(APEFrame)){ 242 av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n", 243 ape->totalframes); 244 return AVERROR_INVALIDDATA; 245 } 246 if (ape->seektablelength / sizeof(uint32_t) < ape->totalframes) { 247 av_log(s, AV_LOG_ERROR, 248 "Number of seek entries is less than number of frames: %"SIZE_SPECIFIER" vs. %"PRIu32"\n", 249 ape->seektablelength / sizeof(uint32_t), ape->totalframes); 250 return AVERROR_INVALIDDATA; 251 } 252 ape->frames = av_malloc_array(ape->totalframes, sizeof(APEFrame)); 253 if(!ape->frames) 254 return AVERROR(ENOMEM); 255 ape->firstframe = ape->junklength + ape->descriptorlength + ape->headerlength + ape->seektablelength + ape->wavheaderlength; 256 if (ape->fileversion < 3810) 257 ape->firstframe += ape->totalframes; 258 ape->currentframe = 0; 259 260 261 ape->totalsamples = ape->finalframeblocks; 262 if (ape->totalframes > 1) 263 ape->totalsamples += ape->blocksperframe * (ape->totalframes - 1); 264 265 ape->frames[0].pos = ape->firstframe; 266 ape->frames[0].nblocks = ape->blocksperframe; 267 ape->frames[0].skip = 0; 268 avio_rl32(pb); // seektable[0] 269 for (i = 1; i < ape->totalframes; i++) { 270 uint32_t seektable_entry = avio_rl32(pb); 271 ape->frames[i].pos = seektable_entry + ape->junklength; 272 ape->frames[i].nblocks = ape->blocksperframe; 273 ape->frames[i - 1].size = ape->frames[i].pos - ape->frames[i - 1].pos; 274 ape->frames[i].skip = (ape->frames[i].pos - ape->frames[0].pos) & 3; 275 276 if (pb->eof_reached) { 277 av_log(s, AV_LOG_ERROR, "seektable truncated\n"); 278 return AVERROR_INVALIDDATA; 279 } 280 ff_dlog(s, "seektable: %8d %"PRIu32"\n", i, seektable_entry); 281 } 282 avio_skip(pb, ape->seektablelength / sizeof(uint32_t) - ape->totalframes); 283 284 ape->frames[ape->totalframes - 1].nblocks = ape->finalframeblocks; 285 /* calculate final packet size from total file size, if available */ 286 file_size = avio_size(pb); 287 if (file_size > 0) { 288 final_size = file_size - ape->frames[ape->totalframes - 1].pos - 289 ape->wavtaillength; 290 final_size -= final_size & 3; 291 } 292 if (file_size <= 0 || final_size <= 0) 293 final_size = ape->finalframeblocks * 8LL; 294 ape->frames[ape->totalframes - 1].size = final_size; 295 296 for (i = 0; i < ape->totalframes; i++) { 297 if(ape->frames[i].skip){ 298 ape->frames[i].pos -= ape->frames[i].skip; 299 ape->frames[i].size += ape->frames[i].skip; 300 } 301 if (ape->frames[i].size > INT_MAX - 3) 302 return AVERROR_INVALIDDATA; 303 ape->frames[i].size = (ape->frames[i].size + 3) & ~3; 304 } 305 if (ape->fileversion < 3810) { 306 for (i = 0; i < ape->totalframes; i++) { 307 int bits = avio_r8(pb); 308 if (i && bits) 309 ape->frames[i - 1].size += 4; 310 311 ape->frames[i].skip <<= 3; 312 ape->frames[i].skip += bits; 313 ff_dlog(s, "bittable: %2d\n", bits); 314 if (pb->eof_reached) { 315 av_log(s, AV_LOG_ERROR, "bittable truncated\n"); 316 return AVERROR_INVALIDDATA; 317 } 318 } 319 } 320 321 ape_dumpinfo(s, ape); 322 323 av_log(s, AV_LOG_VERBOSE, "Decoding file - v%d.%02d, compression level %"PRIu16"\n", 324 ape->fileversion / 1000, (ape->fileversion % 1000) / 10, 325 ape->compressiontype); 326 327 /* now we are ready: build format streams */ 328 st = avformat_new_stream(s, NULL); 329 if (!st) 330 return AVERROR(ENOMEM); 331 332 total_blocks = (ape->totalframes == 0) ? 0 : ((ape->totalframes - 1) * ape->blocksperframe) + ape->finalframeblocks; 333 334 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; 335 st->codecpar->codec_id = AV_CODEC_ID_APE; 336 st->codecpar->codec_tag = MKTAG('A', 'P', 'E', ' '); 337 st->codecpar->ch_layout.nb_channels = ape->channels; 338 st->codecpar->sample_rate = ape->samplerate; 339 st->codecpar->bits_per_coded_sample = ape->bps; 340 341 st->nb_frames = ape->totalframes; 342 st->start_time = 0; 343 st->duration = total_blocks; 344 avpriv_set_pts_info(st, 64, 1, ape->samplerate); 345 346 if ((ret = ff_alloc_extradata(st->codecpar, APE_EXTRADATA_SIZE)) < 0) 347 return ret; 348 AV_WL16(st->codecpar->extradata + 0, ape->fileversion); 349 AV_WL16(st->codecpar->extradata + 2, ape->compressiontype); 350 AV_WL16(st->codecpar->extradata + 4, ape->formatflags); 351 352 pts = 0; 353 for (i = 0; i < ape->totalframes; i++) { 354 ape->frames[i].pts = pts; 355 av_add_index_entry(st, ape->frames[i].pos, ape->frames[i].pts, 0, 0, AVINDEX_KEYFRAME); 356 pts += ape->blocksperframe; 357 } 358 359 /* try to read APE tags */ 360 if (pb->seekable & AVIO_SEEKABLE_NORMAL) { 361 ff_ape_parse_tag(s); 362 avio_seek(pb, 0, SEEK_SET); 363 } 364 365 return 0; 366} 367 368static int ape_read_packet(AVFormatContext * s, AVPacket * pkt) 369{ 370 int ret; 371 int nblocks; 372 APEContext *ape = s->priv_data; 373 uint32_t extra_size = 8; 374 int64_t ret64; 375 376 if (avio_feof(s->pb)) 377 return AVERROR_EOF; 378 if (ape->currentframe >= ape->totalframes) 379 return AVERROR_EOF; 380 381 ret64 = avio_seek(s->pb, ape->frames[ape->currentframe].pos, SEEK_SET); 382 if (ret64 < 0) 383 return ret64; 384 385 /* Calculate how many blocks there are in this frame */ 386 if (ape->currentframe == (ape->totalframes - 1)) 387 nblocks = ape->finalframeblocks; 388 else 389 nblocks = ape->blocksperframe; 390 391 if (ape->frames[ape->currentframe].size <= 0 || 392 ape->frames[ape->currentframe].size > INT_MAX - extra_size) { 393 av_log(s, AV_LOG_ERROR, "invalid packet size: %8"PRId64"\n", 394 ape->frames[ape->currentframe].size); 395 ape->currentframe++; 396 return AVERROR(EIO); 397 } 398 399 ret = av_new_packet(pkt, ape->frames[ape->currentframe].size + extra_size); 400 if (ret < 0) 401 return ret; 402 403 AV_WL32(pkt->data , nblocks); 404 AV_WL32(pkt->data + 4, ape->frames[ape->currentframe].skip); 405 ret = avio_read(s->pb, pkt->data + extra_size, ape->frames[ape->currentframe].size); 406 if (ret < 0) { 407 return ret; 408 } 409 410 pkt->pts = ape->frames[ape->currentframe].pts; 411 pkt->stream_index = 0; 412 413 /* note: we need to modify the packet size here to handle the last 414 packet */ 415 pkt->size = ret + extra_size; 416 417 ape->currentframe++; 418 419 return 0; 420} 421 422static int ape_read_close(AVFormatContext * s) 423{ 424 APEContext *ape = s->priv_data; 425 426 av_freep(&ape->frames); 427 return 0; 428} 429 430static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) 431{ 432 AVStream *st = s->streams[stream_index]; 433 APEContext *ape = s->priv_data; 434 int index = av_index_search_timestamp(st, timestamp, flags); 435 int64_t ret; 436 437 if (index < 0) 438 return -1; 439 440 if ((ret = avio_seek(s->pb, ffstream(st)->index_entries[index].pos, SEEK_SET)) < 0) 441 return ret; 442 ape->currentframe = index; 443 return 0; 444} 445 446const AVInputFormat ff_ape_demuxer = { 447 .name = "ape", 448 .long_name = NULL_IF_CONFIG_SMALL("Monkey's Audio"), 449 .priv_data_size = sizeof(APEContext), 450 .flags_internal = FF_FMT_INIT_CLEANUP, 451 .read_probe = ape_probe, 452 .read_header = ape_read_header, 453 .read_packet = ape_read_packet, 454 .read_close = ape_read_close, 455 .read_seek = ape_read_seek, 456 .extensions = "ape,apl,mac", 457}; 458