| 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 | |
| 43 | typedef struct { |
| 44 | int64_t pos; |
| 45 | int nblocks; |
| 46 | int size; |
| 47 | int skip; |
| 48 | int64_t pts; |
| 49 | } APEFrame; |
| 50 | |
| 51 | typedef 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 | |
| 87 | static 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 | |
| 99 | static 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 | |
| 162 | static 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 | |
| 385 | static 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 (avio_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 | |
| 437 | static 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 | |
| 447 | static 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 | |
| 462 | AVInputFormat 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 | }; |