libavformat/ape.c

   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
  28 #define ENABLE_DEBUG 0
  29
  30 /* The earliest and latest file formats supported by this library */
  31 #define APE_MIN_VERSION 3950
  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 MAC_SUBFRAME_SIZE 4608
  42
  43 #define APE_EXTRADATA_SIZE 6
  44
  45 /* APE tags */
  46 #define APE_TAG_VERSION               2000
  47 #define APE_TAG_FOOTER_BYTES          32
  48 #define APE_TAG_FLAG_CONTAINS_HEADER  (1 << 31)
  49 #define APE_TAG_FLAG_IS_HEADER        (1 << 29)
  50
  51 typedef struct {
  52     int64_t pos;
  53     int nblocks;
  54     int size;
  55     int skip;
  56     int64_t pts;
  57 } APEFrame;
  58
  59 typedef struct {
  60     /* Derived fields */
  61     uint32_t junklength;
  62     uint32_t firstframe;
  63     uint32_t totalsamples;
  64     int currentframe;
  65     APEFrame *frames;
  66
  67     /* Info from Descriptor Block */
  68     char magic[4];
  69     int16_t fileversion;
  70     int16_t padding1;
  71     uint32_t descriptorlength;
  72     uint32_t headerlength;
  73     uint32_t seektablelength;
  74     uint32_t wavheaderlength;
  75     uint32_t audiodatalength;
  76     uint32_t audiodatalength_high;
  77     uint32_t wavtaillength;
  78     uint8_t md5[16];
  79
  80     /* Info from Header Block */
  81     uint16_t compressiontype;
  82     uint16_t formatflags;
  83     uint32_t blocksperframe;
  84     uint32_t finalframeblocks;
  85     uint32_t totalframes;
  86     uint16_t bps;
  87     uint16_t channels;
  88     uint32_t samplerate;
  89
  90     /* Seektable */
  91     uint32_t *seektable;
  92 } APEContext;
  93
  94 static void ape_tag_read_field(AVFormatContext *s)
  95 {
  96     ByteIOContext *pb = s->pb;
  97     uint8_t key[1024], value[1024];
  98     uint32_t size;
  99     int i, l;
 100
 101     size = get_le32(pb);  /* field size */
 102     url_fskip(pb, 4);     /* skip field flags */
 103
 104     for (i=0; pb->buf_ptr[i]!='0' && pb->buf_ptr[i]>=0x20 && pb->buf_ptr[i]<=0x7E; i++);
 105
 106     l = FFMIN(i,    sizeof(key) -1);
 107     get_buffer(pb, key,  l);
 108     key[l]  = 0;
 109     url_fskip(pb, 1 + i-l);
 110     l = FFMIN(size, sizeof(value)-1);
 111     get_buffer(pb, value, l);
 112     value[l] = 0;
 113     url_fskip(pb, size-l);
 114     if (l < size)
 115         av_log(s, AV_LOG_WARNING, "Too long '%s' tag was truncated.\n", key);
 116     av_metadata_set(&s->metadata, key, value);
 117 }
 118
 119 static void ape_parse_tag(AVFormatContext *s)
 120 {
 121     ByteIOContext *pb = s->pb;
 122     int file_size = url_fsize(pb);
 123     uint32_t val, fields, tag_bytes;
 124     uint8_t buf[8];
 125     int i;
 126
 127     if (file_size < APE_TAG_FOOTER_BYTES)
 128         return;
 129
 130     url_fseek(pb, file_size - APE_TAG_FOOTER_BYTES, SEEK_SET);
 131
 132     get_buffer(pb, buf, 8);    /* APETAGEX */
 133     if (strncmp(buf, "APETAGEX", 8)) {
 134         return;
 135     }
 136
 137     val = get_le32(pb);        /* APE tag version */
 138     if (val > APE_TAG_VERSION) {
 139         av_log(s, AV_LOG_ERROR, "Unsupported tag version. (>=%d)\n", APE_TAG_VERSION);
 140         return;
 141     }
 142
 143     tag_bytes = get_le32(pb);  /* tag size */
 144     if (tag_bytes - APE_TAG_FOOTER_BYTES > (1024 * 1024 * 16)) {
 145         av_log(s, AV_LOG_ERROR, "Tag size is way too big\n");
 146         return;
 147     }
 148
 149     fields = get_le32(pb);     /* number of fields */
 150     if (fields > 65536) {
 151         av_log(s, AV_LOG_ERROR, "Too many tag fields (%d)\n", fields);
 152         return;
 153     }
 154
 155     val = get_le32(pb);        /* flags */
 156     if (val & APE_TAG_FLAG_IS_HEADER) {
 157         av_log(s, AV_LOG_ERROR, "APE Tag is a header\n");
 158         return;
 159     }
 160
 161     if (val & APE_TAG_FLAG_CONTAINS_HEADER)
 162         tag_bytes += 2*APE_TAG_FOOTER_BYTES;
 163
 164     url_fseek(pb, file_size - tag_bytes, SEEK_SET);
 165
 166     for (i=0; i<fields; i++)
 167         ape_tag_read_field(s);
 168
 169 #if ENABLE_DEBUG
 170     av_log(s, AV_LOG_DEBUG, "\nAPE Tags:\n\n");
 171     av_log(s, AV_LOG_DEBUG, "title     = %s\n", s->title);
 172     av_log(s, AV_LOG_DEBUG, "author    = %s\n", s->author);
 173     av_log(s, AV_LOG_DEBUG, "copyright = %s\n", s->copyright);
 174     av_log(s, AV_LOG_DEBUG, "comment   = %s\n", s->comment);
 175     av_log(s, AV_LOG_DEBUG, "album     = %s\n", s->album);
 176     av_log(s, AV_LOG_DEBUG, "year      = %d\n", s->year);
 177     av_log(s, AV_LOG_DEBUG, "track     = %d\n", s->track);
 178     av_log(s, AV_LOG_DEBUG, "genre     = %s\n", s->genre);
 179 #endif
 180 }
 181
 182 static int ape_probe(AVProbeData * p)
 183 {
 184     if (p->buf[0] == 'M' && p->buf[1] == 'A' && p->buf[2] == 'C' && p->buf[3] == ' ')
 185         return AVPROBE_SCORE_MAX;
 186
 187     return 0;
 188 }
 189
 190 static void ape_dumpinfo(AVFormatContext * s, APEContext * ape_ctx)
 191 {
 192 #if ENABLE_DEBUG
 193     int i;
 194
 195     av_log(s, AV_LOG_DEBUG, "Descriptor Block:\n\n");
 196     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]);
 197     av_log(s, AV_LOG_DEBUG, "fileversion          = %d\n", ape_ctx->fileversion);
 198     av_log(s, AV_LOG_DEBUG, "descriptorlength     = %d\n", ape_ctx->descriptorlength);
 199     av_log(s, AV_LOG_DEBUG, "headerlength         = %d\n", ape_ctx->headerlength);
 200     av_log(s, AV_LOG_DEBUG, "seektablelength      = %d\n", ape_ctx->seektablelength);
 201     av_log(s, AV_LOG_DEBUG, "wavheaderlength      = %d\n", ape_ctx->wavheaderlength);
 202     av_log(s, AV_LOG_DEBUG, "audiodatalength      = %d\n", ape_ctx->audiodatalength);
 203     av_log(s, AV_LOG_DEBUG, "audiodatalength_high = %d\n", ape_ctx->audiodatalength_high);
 204     av_log(s, AV_LOG_DEBUG, "wavtaillength        = %d\n", ape_ctx->wavtaillength);
 205     av_log(s, AV_LOG_DEBUG, "md5                  = ");
 206     for (i = 0; i < 16; i++)
 207          av_log(s, AV_LOG_DEBUG, "%02x", ape_ctx->md5[i]);
 208     av_log(s, AV_LOG_DEBUG, "\n");
 209
 210     av_log(s, AV_LOG_DEBUG, "\nHeader Block:\n\n");
 211
 212     av_log(s, AV_LOG_DEBUG, "compressiontype      = %d\n", ape_ctx->compressiontype);
 213     av_log(s, AV_LOG_DEBUG, "formatflags          = %d\n", ape_ctx->formatflags);
 214     av_log(s, AV_LOG_DEBUG, "blocksperframe       = %d\n", ape_ctx->blocksperframe);
 215     av_log(s, AV_LOG_DEBUG, "finalframeblocks     = %d\n", ape_ctx->finalframeblocks);
 216     av_log(s, AV_LOG_DEBUG, "totalframes          = %d\n", ape_ctx->totalframes);
 217     av_log(s, AV_LOG_DEBUG, "bps                  = %d\n", ape_ctx->bps);
 218     av_log(s, AV_LOG_DEBUG, "channels             = %d\n", ape_ctx->channels);
 219     av_log(s, AV_LOG_DEBUG, "samplerate           = %d\n", ape_ctx->samplerate);
 220
 221     av_log(s, AV_LOG_DEBUG, "\nSeektable\n\n");
 222     if ((ape_ctx->seektablelength / sizeof(uint32_t)) != ape_ctx->totalframes) {
 223         av_log(s, AV_LOG_DEBUG, "No seektable\n");
 224     } else {
 225         for (i = 0; i < ape_ctx->seektablelength / sizeof(uint32_t); i++) {
 226             if (i < ape_ctx->totalframes - 1) {
 227                 av_log(s, AV_LOG_DEBUG, "%8d   %d (%d bytes)\n", i, ape_ctx->seektable[i], ape_ctx->seektable[i + 1] - ape_ctx->seektable[i]);
 228             } else {
 229                 av_log(s, AV_LOG_DEBUG, "%8d   %d\n", i, ape_ctx->seektable[i]);
 230             }
 231         }
 232     }
 233
 234     av_log(s, AV_LOG_DEBUG, "\nFrames\n\n");
 235     for (i = 0; i < ape_ctx->totalframes; i++)
 236         av_log(s, AV_LOG_DEBUG, "%8d   %8lld %8d (%d samples)\n", i, ape_ctx->frames[i].pos, ape_ctx->frames[i].size, ape_ctx->frames[i].nblocks);
 237
 238     av_log(s, AV_LOG_DEBUG, "\nCalculated information:\n\n");
 239     av_log(s, AV_LOG_DEBUG, "junklength           = %d\n", ape_ctx->junklength);
 240     av_log(s, AV_LOG_DEBUG, "firstframe           = %d\n", ape_ctx->firstframe);
 241     av_log(s, AV_LOG_DEBUG, "totalsamples         = %d\n", ape_ctx->totalsamples);
 242 #endif
 243 }
 244
 245 static int ape_read_header(AVFormatContext * s, AVFormatParameters * ap)
 246 {
 247     ByteIOContext *pb = s->pb;
 248     APEContext *ape = s->priv_data;
 249     AVStream *st;
 250     uint32_t tag;
 251     int i;
 252     int total_blocks;
 253     int64_t pts;
 254
 255     /* TODO: Skip any leading junk such as id3v2 tags */
 256     ape->junklength = 0;
 257
 258     tag = get_le32(pb);
 259     if (tag != MKTAG('M', 'A', 'C', ' '))
 260         return -1;
 261
 262     ape->fileversion = get_le16(pb);
 263
 264     if (ape->fileversion < APE_MIN_VERSION || ape->fileversion > APE_MAX_VERSION) {
 265         av_log(s, AV_LOG_ERROR, "Unsupported file version - %d.%02d\n", ape->fileversion / 1000, (ape->fileversion % 1000) / 10);
 266         return -1;
 267     }
 268
 269     if (ape->fileversion >= 3980) {
 270         ape->padding1             = get_le16(pb);
 271         ape->descriptorlength     = get_le32(pb);
 272         ape->headerlength         = get_le32(pb);
 273         ape->seektablelength      = get_le32(pb);
 274         ape->wavheaderlength      = get_le32(pb);
 275         ape->audiodatalength      = get_le32(pb);
 276         ape->audiodatalength_high = get_le32(pb);
 277         ape->wavtaillength        = get_le32(pb);
 278         get_buffer(pb, ape->md5, 16);
 279
 280         /* Skip any unknown bytes at the end of the descriptor.
 281            This is for future compatibility */
 282         if (ape->descriptorlength > 52)
 283             url_fseek(pb, ape->descriptorlength - 52, SEEK_CUR);
 284
 285         /* Read header data */
 286         ape->compressiontype      = get_le16(pb);
 287         ape->formatflags          = get_le16(pb);
 288         ape->blocksperframe       = get_le32(pb);
 289         ape->finalframeblocks     = get_le32(pb);
 290         ape->totalframes          = get_le32(pb);
 291         ape->bps                  = get_le16(pb);
 292         ape->channels             = get_le16(pb);
 293         ape->samplerate           = get_le32(pb);
 294     } else {
 295         ape->descriptorlength = 0;
 296         ape->headerlength = 32;
 297
 298         ape->compressiontype      = get_le16(pb);
 299         ape->formatflags          = get_le16(pb);
 300         ape->channels             = get_le16(pb);
 301         ape->samplerate           = get_le32(pb);
 302         ape->wavheaderlength      = get_le32(pb);
 303         ape->wavtaillength        = get_le32(pb);
 304         ape->totalframes          = get_le32(pb);
 305         ape->finalframeblocks     = get_le32(pb);
 306
 307         if (ape->formatflags & MAC_FORMAT_FLAG_HAS_PEAK_LEVEL) {
 308             url_fseek(pb, 4, SEEK_CUR); /* Skip the peak level */
 309             ape->headerlength += 4;
 310         }
 311
 312         if (ape->formatflags & MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS) {
 313             ape->seektablelength = get_le32(pb);
 314             ape->headerlength += 4;
 315             ape->seektablelength *= sizeof(int32_t);
 316         } else
 317             ape->seektablelength = ape->totalframes * sizeof(int32_t);
 318
 319         if (ape->formatflags & MAC_FORMAT_FLAG_8_BIT)
 320             ape->bps = 8;
 321         else if (ape->formatflags & MAC_FORMAT_FLAG_24_BIT)
 322             ape->bps = 24;
 323         else
 324             ape->bps = 16;
 325
 326         if (ape->fileversion >= 3950)
 327             ape->blocksperframe = 73728 * 4;
 328         else if (ape->fileversion >= 3900 || (ape->fileversion >= 3800  && ape->compressiontype >= 4000))
 329             ape->blocksperframe = 73728;
 330         else
 331             ape->blocksperframe = 9216;
 332
 333         /* Skip any stored wav header */
 334         if (!(ape->formatflags & MAC_FORMAT_FLAG_CREATE_WAV_HEADER))
 335             url_fskip(pb, ape->wavheaderlength);
 336     }
 337
 338     if(ape->totalframes > UINT_MAX / sizeof(APEFrame)){
 339         av_log(s, AV_LOG_ERROR, "Too many frames: %d\n", ape->totalframes);
 340         return -1;
 341     }
 342     ape->frames       = av_malloc(ape->totalframes * sizeof(APEFrame));
 343     if(!ape->frames)
 344         return AVERROR_NOMEM;
 345     ape->firstframe   = ape->junklength + ape->descriptorlength + ape->headerlength + ape->seektablelength + ape->wavheaderlength;
 346     ape->currentframe = 0;
 347
 348
 349     ape->totalsamples = ape->finalframeblocks;
 350     if (ape->totalframes > 1)
 351         ape->totalsamples += ape->blocksperframe * (ape->totalframes - 1);
 352
 353     if (ape->seektablelength > 0) {
 354         ape->seektable = av_malloc(ape->seektablelength);
 355         for (i = 0; i < ape->seektablelength / sizeof(uint32_t); i++)
 356             ape->seektable[i] = get_le32(pb);
 357     }
 358
 359     ape->frames[0].pos     = ape->firstframe;
 360     ape->frames[0].nblocks = ape->blocksperframe;
 361     ape->frames[0].skip    = 0;
 362     for (i = 1; i < ape->totalframes; i++) {
 363         ape->frames[i].pos      = ape->seektable[i]; //ape->frames[i-1].pos + ape->blocksperframe;
 364         ape->frames[i].nblocks  = ape->blocksperframe;
 365         ape->frames[i - 1].size = ape->frames[i].pos - ape->frames[i - 1].pos;
 366         ape->frames[i].skip     = (ape->frames[i].pos - ape->frames[0].pos) & 3;
 367     }
 368     ape->frames[ape->totalframes - 1].size    = ape->finalframeblocks * 4;
 369     ape->frames[ape->totalframes - 1].nblocks = ape->finalframeblocks;
 370
 371     for (i = 0; i < ape->totalframes; i++) {
 372         if(ape->frames[i].skip){
 373             ape->frames[i].pos  -= ape->frames[i].skip;
 374             ape->frames[i].size += ape->frames[i].skip;
 375         }
 376         ape->frames[i].size = (ape->frames[i].size + 3) & ~3;
 377     }
 378
 379
 380     ape_dumpinfo(s, ape);
 381
 382     /* try to read APE tags */
 383     if (!url_is_streamed(pb)) {
 384         ape_parse_tag(s);
 385         url_fseek(pb, 0, SEEK_SET);
 386     }
 387
 388     av_log(s, AV_LOG_DEBUG, "Decoding file - v%d.%02d, compression level %d\n", ape->fileversion / 1000, (ape->fileversion % 1000) / 10, ape->compressiontype);
 389
 390     /* now we are ready: build format streams */
 391     st = av_new_stream(s, 0);
 392     if (!st)
 393         return -1;
 394
 395     total_blocks = (ape->totalframes == 0) ? 0 : ((ape->totalframes - 1) * ape->blocksperframe) + ape->finalframeblocks;
 396
 397     st->codec->codec_type      = CODEC_TYPE_AUDIO;
 398     st->codec->codec_id        = CODEC_ID_APE;
 399     st->codec->codec_tag       = MKTAG('A', 'P', 'E', ' ');
 400     st->codec->channels        = ape->channels;
 401     st->codec->sample_rate     = ape->samplerate;
 402     st->codec->bits_per_coded_sample = ape->bps;
 403     st->codec->frame_size      = MAC_SUBFRAME_SIZE;
 404
 405     st->nb_frames = ape->totalframes;
 406     s->start_time = 0;
 407     s->duration   = (int64_t) total_blocks * AV_TIME_BASE / ape->samplerate;
 408     av_set_pts_info(st, 64, MAC_SUBFRAME_SIZE, ape->samplerate);
 409
 410     st->codec->extradata = av_malloc(APE_EXTRADATA_SIZE);
 411     st->codec->extradata_size = APE_EXTRADATA_SIZE;
 412     AV_WL16(st->codec->extradata + 0, ape->fileversion);
 413     AV_WL16(st->codec->extradata + 2, ape->compressiontype);
 414     AV_WL16(st->codec->extradata + 4, ape->formatflags);
 415
 416     pts = 0;
 417     for (i = 0; i < ape->totalframes; i++) {
 418         ape->frames[i].pts = pts;
 419         av_add_index_entry(st, ape->frames[i].pos, ape->frames[i].pts, 0, 0, AVINDEX_KEYFRAME);
 420         pts += ape->blocksperframe / MAC_SUBFRAME_SIZE;
 421     }
 422
 423     return 0;
 424 }
 425
 426 static int ape_read_packet(AVFormatContext * s, AVPacket * pkt)
 427 {
 428     int ret;
 429     int nblocks;
 430     APEContext *ape = s->priv_data;
 431     uint32_t extra_size = 8;
 432
 433     if (url_feof(s->pb))
 434         return AVERROR_IO;
 435     if (ape->currentframe > ape->totalframes)
 436         return AVERROR_IO;
 437
 438     url_fseek (s->pb, ape->frames[ape->currentframe].pos, SEEK_SET);
 439
 440     /* Calculate how many blocks there are in this frame */
 441     if (ape->currentframe == (ape->totalframes - 1))
 442         nblocks = ape->finalframeblocks;
 443     else
 444         nblocks = ape->blocksperframe;
 445
 446     if (av_new_packet(pkt,  ape->frames[ape->currentframe].size + extra_size) < 0)
 447         return AVERROR_NOMEM;
 448
 449     AV_WL32(pkt->data    , nblocks);
 450     AV_WL32(pkt->data + 4, ape->frames[ape->currentframe].skip);
 451     ret = get_buffer(s->pb, pkt->data + extra_size, ape->frames[ape->currentframe].size);
 452
 453     pkt->pts = ape->frames[ape->currentframe].pts;
 454     pkt->stream_index = 0;
 455
 456     /* note: we need to modify the packet size here to handle the last
 457        packet */
 458     pkt->size = ret + extra_size;
 459
 460     ape->currentframe++;
 461
 462     return 0;
 463 }
 464
 465 static int ape_read_close(AVFormatContext * s)
 466 {
 467     APEContext *ape = s->priv_data;
 468
 469     av_freep(&ape->frames);
 470     av_freep(&ape->seektable);
 471     return 0;
 472 }
 473
 474 static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
 475 {
 476     AVStream *st = s->streams[stream_index];
 477     APEContext *ape = s->priv_data;
 478     int index = av_index_search_timestamp(st, timestamp, flags);
 479
 480     if (index < 0)
 481         return -1;
 482
 483     ape->currentframe = index;
 484     return 0;
 485 }
 486
 487 AVInputFormat ape_demuxer = {
 488     "ape",
 489     NULL_IF_CONFIG_SMALL("Monkey's Audio"),
 490     sizeof(APEContext),
 491     ape_probe,
 492     ape_read_header,
 493     ape_read_packet,
 494     ape_read_close,
 495     ape_read_seek,
 496     .extensions = "ape,apl,mac"
 497 };