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  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.     if (p->buf[0] == 'M' && p->buf[1] == 'A' && p->buf[2] == 'C' && p->buf[3] == ' ')
  90.         return AVPROBE_SCORE_MAX;
  91.  
  92.     return 0;
  93. }
  94.  
  95. static void ape_dumpinfo(AVFormatContext * s, APEContext * ape_ctx)
  96. {
  97. #ifdef DEBUG
  98.     int i;
  99.  
  100.     av_log(s, AV_LOG_DEBUG, "Descriptor Block:\n\n");
  101.     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]);
  102.     av_log(s, AV_LOG_DEBUG, "fileversion          = %"PRId16"\n", ape_ctx->fileversion);
  103.     av_log(s, AV_LOG_DEBUG, "descriptorlength     = %"PRIu32"\n", ape_ctx->descriptorlength);
  104.     av_log(s, AV_LOG_DEBUG, "headerlength         = %"PRIu32"\n", ape_ctx->headerlength);
  105.     av_log(s, AV_LOG_DEBUG, "seektablelength      = %"PRIu32"\n", ape_ctx->seektablelength);
  106.     av_log(s, AV_LOG_DEBUG, "wavheaderlength      = %"PRIu32"\n", ape_ctx->wavheaderlength);
  107.     av_log(s, AV_LOG_DEBUG, "audiodatalength      = %"PRIu32"\n", ape_ctx->audiodatalength);
  108.     av_log(s, AV_LOG_DEBUG, "audiodatalength_high = %"PRIu32"\n", ape_ctx->audiodatalength_high);
  109.     av_log(s, AV_LOG_DEBUG, "wavtaillength        = %"PRIu32"\n", ape_ctx->wavtaillength);
  110.     av_log(s, AV_LOG_DEBUG, "md5                  = ");
  111.     for (i = 0; i < 16; i++)
  112.          av_log(s, AV_LOG_DEBUG, "%02x", ape_ctx->md5[i]);
  113.     av_log(s, AV_LOG_DEBUG, "\n");
  114.  
  115.     av_log(s, AV_LOG_DEBUG, "\nHeader Block:\n\n");
  116.  
  117.     av_log(s, AV_LOG_DEBUG, "compressiontype      = %"PRIu16"\n", ape_ctx->compressiontype);
  118.     av_log(s, AV_LOG_DEBUG, "formatflags          = %"PRIu16"\n", ape_ctx->formatflags);
  119.     av_log(s, AV_LOG_DEBUG, "blocksperframe       = %"PRIu32"\n", ape_ctx->blocksperframe);
  120.     av_log(s, AV_LOG_DEBUG, "finalframeblocks     = %"PRIu32"\n", ape_ctx->finalframeblocks);
  121.     av_log(s, AV_LOG_DEBUG, "totalframes          = %"PRIu32"\n", ape_ctx->totalframes);
  122.     av_log(s, AV_LOG_DEBUG, "bps                  = %"PRIu16"\n", ape_ctx->bps);
  123.     av_log(s, AV_LOG_DEBUG, "channels             = %"PRIu16"\n", ape_ctx->channels);
  124.     av_log(s, AV_LOG_DEBUG, "samplerate           = %"PRIu32"\n", ape_ctx->samplerate);
  125.  
  126.     av_log(s, AV_LOG_DEBUG, "\nSeektable\n\n");
  127.     if ((ape_ctx->seektablelength / sizeof(uint32_t)) != ape_ctx->totalframes) {
  128.         av_log(s, AV_LOG_DEBUG, "No seektable\n");
  129.     } else {
  130.         for (i = 0; i < ape_ctx->seektablelength / sizeof(uint32_t); i++) {
  131.             if (i < ape_ctx->totalframes - 1) {
  132.                 av_log(s, AV_LOG_DEBUG, "%8d   %"PRIu32" (%"PRIu32" bytes)",
  133.                        i, ape_ctx->seektable[i],
  134.                        ape_ctx->seektable[i + 1] - ape_ctx->seektable[i]);
  135.                 if (ape_ctx->bittable)
  136.                     av_log(s, AV_LOG_DEBUG, " + %2d bits\n",
  137.                            ape_ctx->bittable[i]);
  138.                 av_log(s, AV_LOG_DEBUG, "\n");
  139.             } else {
  140.                 av_log(s, AV_LOG_DEBUG, "%8d   %"PRIu32"\n", i, ape_ctx->seektable[i]);
  141.             }
  142.         }
  143.     }
  144.  
  145.     av_log(s, AV_LOG_DEBUG, "\nFrames\n\n");
  146.     for (i = 0; i < ape_ctx->totalframes; i++)
  147.         av_log(s, AV_LOG_DEBUG, "%8d   %8"PRId64" %8d (%d samples)\n", i,
  148.                ape_ctx->frames[i].pos, ape_ctx->frames[i].size,
  149.                ape_ctx->frames[i].nblocks);
  150.  
  151.     av_log(s, AV_LOG_DEBUG, "\nCalculated information:\n\n");
  152.     av_log(s, AV_LOG_DEBUG, "junklength           = %"PRIu32"\n", ape_ctx->junklength);
  153.     av_log(s, AV_LOG_DEBUG, "firstframe           = %"PRIu32"\n", ape_ctx->firstframe);
  154.     av_log(s, AV_LOG_DEBUG, "totalsamples         = %"PRIu32"\n", ape_ctx->totalsamples);
  155. #endif
  156. }
  157.  
  158. static int ape_read_header(AVFormatContext * s)
  159. {
  160.     AVIOContext *pb = s->pb;
  161.     APEContext *ape = s->priv_data;
  162.     AVStream *st;
  163.     uint32_t tag;
  164.     int i;
  165.     int total_blocks, final_size = 0;
  166.     int64_t pts, file_size;
  167.  
  168.     /* Skip any leading junk such as id3v2 tags */
  169.     ape->junklength = avio_tell(pb);
  170.  
  171.     tag = avio_rl32(pb);
  172.     if (tag != MKTAG('M', 'A', 'C', ' '))
  173.         return AVERROR_INVALIDDATA;
  174.  
  175.     ape->fileversion = avio_rl16(pb);
  176.  
  177.     if (ape->fileversion < APE_MIN_VERSION || ape->fileversion > APE_MAX_VERSION) {
  178.         av_log(s, AV_LOG_ERROR, "Unsupported file version - %d.%02d\n",
  179.                ape->fileversion / 1000, (ape->fileversion % 1000) / 10);
  180.         return AVERROR_PATCHWELCOME;
  181.     }
  182.  
  183.     if (ape->fileversion >= 3980) {
  184.         ape->padding1             = avio_rl16(pb);
  185.         ape->descriptorlength     = avio_rl32(pb);
  186.         ape->headerlength         = avio_rl32(pb);
  187.         ape->seektablelength      = avio_rl32(pb);
  188.         ape->wavheaderlength      = avio_rl32(pb);
  189.         ape->audiodatalength      = avio_rl32(pb);
  190.         ape->audiodatalength_high = avio_rl32(pb);
  191.         ape->wavtaillength        = avio_rl32(pb);
  192.         avio_read(pb, ape->md5, 16);
  193.  
  194.         /* Skip any unknown bytes at the end of the descriptor.
  195.            This is for future compatibility */
  196.         if (ape->descriptorlength > 52)
  197.             avio_skip(pb, ape->descriptorlength - 52);
  198.  
  199.         /* Read header data */
  200.         ape->compressiontype      = avio_rl16(pb);
  201.         ape->formatflags          = avio_rl16(pb);
  202.         ape->blocksperframe       = avio_rl32(pb);
  203.         ape->finalframeblocks     = avio_rl32(pb);
  204.         ape->totalframes          = avio_rl32(pb);
  205.         ape->bps                  = avio_rl16(pb);
  206.         ape->channels             = avio_rl16(pb);
  207.         ape->samplerate           = avio_rl32(pb);
  208.     } else {
  209.         ape->descriptorlength = 0;
  210.         ape->headerlength = 32;
  211.  
  212.         ape->compressiontype      = avio_rl16(pb);
  213.         ape->formatflags          = avio_rl16(pb);
  214.         ape->channels             = avio_rl16(pb);
  215.         ape->samplerate           = avio_rl32(pb);
  216.         ape->wavheaderlength      = avio_rl32(pb);
  217.         ape->wavtaillength        = avio_rl32(pb);
  218.         ape->totalframes          = avio_rl32(pb);
  219.         ape->finalframeblocks     = avio_rl32(pb);
  220.  
  221.         if (ape->formatflags & MAC_FORMAT_FLAG_HAS_PEAK_LEVEL) {
  222.             avio_skip(pb, 4); /* Skip the peak level */
  223.             ape->headerlength += 4;
  224.         }
  225.  
  226.         if (ape->formatflags & MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS) {
  227.             ape->seektablelength = avio_rl32(pb);
  228.             ape->headerlength += 4;
  229.             ape->seektablelength *= sizeof(int32_t);
  230.         } else
  231.             ape->seektablelength = ape->totalframes * sizeof(int32_t);
  232.  
  233.         if (ape->formatflags & MAC_FORMAT_FLAG_8_BIT)
  234.             ape->bps = 8;
  235.         else if (ape->formatflags & MAC_FORMAT_FLAG_24_BIT)
  236.             ape->bps = 24;
  237.         else
  238.             ape->bps = 16;
  239.  
  240.         if (ape->fileversion >= 3950)
  241.             ape->blocksperframe = 73728 * 4;
  242.         else if (ape->fileversion >= 3900 || (ape->fileversion >= 3800  && ape->compressiontype >= 4000))
  243.             ape->blocksperframe = 73728;
  244.         else
  245.             ape->blocksperframe = 9216;
  246.  
  247.         /* Skip any stored wav header */
  248.         if (!(ape->formatflags & MAC_FORMAT_FLAG_CREATE_WAV_HEADER))
  249.             avio_skip(pb, ape->wavheaderlength);
  250.     }
  251.  
  252.     if(!ape->totalframes){
  253.         av_log(s, AV_LOG_ERROR, "No frames in the file!\n");
  254.         return AVERROR(EINVAL);
  255.     }
  256.     if(ape->totalframes > UINT_MAX / sizeof(APEFrame)){
  257.         av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n",
  258.                ape->totalframes);
  259.         return AVERROR_INVALIDDATA;
  260.     }
  261.     if (ape->seektablelength / sizeof(*ape->seektable) < ape->totalframes) {
  262.         av_log(s, AV_LOG_ERROR,
  263.                "Number of seek entries is less than number of frames: %zu vs. %"PRIu32"\n",
  264.                ape->seektablelength / sizeof(*ape->seektable), ape->totalframes);
  265.         return AVERROR_INVALIDDATA;
  266.     }
  267.     ape->frames       = av_malloc(ape->totalframes * sizeof(APEFrame));
  268.     if(!ape->frames)
  269.         return AVERROR(ENOMEM);
  270.     ape->firstframe   = ape->junklength + ape->descriptorlength + ape->headerlength + ape->seektablelength + ape->wavheaderlength;
  271.     if (ape->fileversion < 3810)
  272.         ape->firstframe += ape->totalframes;
  273.     ape->currentframe = 0;
  274.  
  275.  
  276.     ape->totalsamples = ape->finalframeblocks;
  277.     if (ape->totalframes > 1)
  278.         ape->totalsamples += ape->blocksperframe * (ape->totalframes - 1);
  279.  
  280.     if (ape->seektablelength > 0) {
  281.         ape->seektable = av_malloc(ape->seektablelength);
  282.         if (!ape->seektable)
  283.             return AVERROR(ENOMEM);
  284.         for (i = 0; i < ape->seektablelength / sizeof(uint32_t) && !pb->eof_reached; i++)
  285.             ape->seektable[i] = avio_rl32(pb);
  286.         if (ape->fileversion < 3810) {
  287.             ape->bittable = av_malloc(ape->totalframes);
  288.             if (!ape->bittable)
  289.                 return AVERROR(ENOMEM);
  290.             for (i = 0; i < ape->totalframes && !pb->eof_reached; i++)
  291.                 ape->bittable[i] = avio_r8(pb);
  292.         }
  293.     }
  294.  
  295.     ape->frames[0].pos     = ape->firstframe;
  296.     ape->frames[0].nblocks = ape->blocksperframe;
  297.     ape->frames[0].skip    = 0;
  298.     for (i = 1; i < ape->totalframes; i++) {
  299.         ape->frames[i].pos      = ape->seektable[i] + ape->junklength;
  300.         ape->frames[i].nblocks  = ape->blocksperframe;
  301.         ape->frames[i - 1].size = ape->frames[i].pos - ape->frames[i - 1].pos;
  302.         ape->frames[i].skip     = (ape->frames[i].pos - ape->frames[0].pos) & 3;
  303.     }
  304.     ape->frames[ape->totalframes - 1].nblocks = ape->finalframeblocks;
  305.     /* calculate final packet size from total file size, if available */
  306.     file_size = avio_size(pb);
  307.     if (file_size > 0) {
  308.         final_size = file_size - ape->frames[ape->totalframes - 1].pos -
  309.                      ape->wavtaillength;
  310.         final_size -= final_size & 3;
  311.     }
  312.     if (file_size <= 0 || final_size <= 0)
  313.         final_size = ape->finalframeblocks * 8;
  314.     ape->frames[ape->totalframes - 1].size = final_size;
  315.  
  316.     for (i = 0; i < ape->totalframes; i++) {
  317.         if(ape->frames[i].skip){
  318.             ape->frames[i].pos  -= ape->frames[i].skip;
  319.             ape->frames[i].size += ape->frames[i].skip;
  320.         }
  321.         ape->frames[i].size = (ape->frames[i].size + 3) & ~3;
  322.     }
  323.     if (ape->fileversion < 3810) {
  324.         for (i = 0; i < ape->totalframes; i++) {
  325.             if (i < ape->totalframes - 1 && ape->bittable[i + 1])
  326.                 ape->frames[i].size += 4;
  327.             ape->frames[i].skip <<= 3;
  328.             ape->frames[i].skip  += ape->bittable[i];
  329.         }
  330.     }
  331.  
  332.     ape_dumpinfo(s, ape);
  333.  
  334.     av_log(s, AV_LOG_DEBUG, "Decoding file - v%d.%02d, compression level %"PRIu16"\n",
  335.            ape->fileversion / 1000, (ape->fileversion % 1000) / 10,
  336.            ape->compressiontype);
  337.  
  338.     /* now we are ready: build format streams */
  339.     st = avformat_new_stream(s, NULL);
  340.     if (!st)
  341.         return AVERROR(ENOMEM);
  342.  
  343.     total_blocks = (ape->totalframes == 0) ? 0 : ((ape->totalframes - 1) * ape->blocksperframe) + ape->finalframeblocks;
  344.  
  345.     st->codec->codec_type      = AVMEDIA_TYPE_AUDIO;
  346.     st->codec->codec_id        = AV_CODEC_ID_APE;
  347.     st->codec->codec_tag       = MKTAG('A', 'P', 'E', ' ');
  348.     st->codec->channels        = ape->channels;
  349.     st->codec->sample_rate     = ape->samplerate;
  350.     st->codec->bits_per_coded_sample = ape->bps;
  351.  
  352.     st->nb_frames = ape->totalframes;
  353.     st->start_time = 0;
  354.     st->duration  = total_blocks;
  355.     avpriv_set_pts_info(st, 64, 1, ape->samplerate);
  356.  
  357.     if (ff_alloc_extradata(st->codec, APE_EXTRADATA_SIZE))
  358.         return AVERROR(ENOMEM);
  359.     AV_WL16(st->codec->extradata + 0, ape->fileversion);
  360.     AV_WL16(st->codec->extradata + 2, ape->compressiontype);
  361.     AV_WL16(st->codec->extradata + 4, ape->formatflags);
  362.  
  363.     pts = 0;
  364.     for (i = 0; i < ape->totalframes; i++) {
  365.         ape->frames[i].pts = pts;
  366.         av_add_index_entry(st, ape->frames[i].pos, ape->frames[i].pts, 0, 0, AVINDEX_KEYFRAME);
  367.         pts += ape->blocksperframe;
  368.     }
  369.  
  370.     /* try to read APE tags */
  371.     if (pb->seekable) {
  372.         ff_ape_parse_tag(s);
  373.         avio_seek(pb, 0, SEEK_SET);
  374.     }
  375.  
  376.     return 0;
  377. }
  378.  
  379. static int ape_read_packet(AVFormatContext * s, AVPacket * pkt)
  380. {
  381.     int ret;
  382.     int nblocks;
  383.     APEContext *ape = s->priv_data;
  384.     uint32_t extra_size = 8;
  385.  
  386.     if (url_feof(s->pb))
  387.         return AVERROR_EOF;
  388.     if (ape->currentframe >= ape->totalframes)
  389.         return AVERROR_EOF;
  390.  
  391.     if (avio_seek(s->pb, ape->frames[ape->currentframe].pos, SEEK_SET) < 0)
  392.         return AVERROR(EIO);
  393.  
  394.     /* Calculate how many blocks there are in this frame */
  395.     if (ape->currentframe == (ape->totalframes - 1))
  396.         nblocks = ape->finalframeblocks;
  397.     else
  398.         nblocks = ape->blocksperframe;
  399.  
  400.     if (ape->frames[ape->currentframe].size <= 0 ||
  401.         ape->frames[ape->currentframe].size > INT_MAX - extra_size) {
  402.         av_log(s, AV_LOG_ERROR, "invalid packet size: %d\n",
  403.                ape->frames[ape->currentframe].size);
  404.         ape->currentframe++;
  405.         return AVERROR(EIO);
  406.     }
  407.  
  408.     if (av_new_packet(pkt,  ape->frames[ape->currentframe].size + extra_size) < 0)
  409.         return AVERROR(ENOMEM);
  410.  
  411.     AV_WL32(pkt->data    , nblocks);
  412.     AV_WL32(pkt->data + 4, ape->frames[ape->currentframe].skip);
  413.     ret = avio_read(s->pb, pkt->data + extra_size, ape->frames[ape->currentframe].size);
  414.     if (ret < 0)
  415.         return ret;
  416.  
  417.     pkt->pts = ape->frames[ape->currentframe].pts;
  418.     pkt->stream_index = 0;
  419.  
  420.     /* note: we need to modify the packet size here to handle the last
  421.        packet */
  422.     pkt->size = ret + extra_size;
  423.  
  424.     ape->currentframe++;
  425.  
  426.     return 0;
  427. }
  428.  
  429. static int ape_read_close(AVFormatContext * s)
  430. {
  431.     APEContext *ape = s->priv_data;
  432.  
  433.     av_freep(&ape->frames);
  434.     av_freep(&ape->seektable);
  435.     av_freep(&ape->bittable);
  436.     return 0;
  437. }
  438.  
  439. static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
  440. {
  441.     AVStream *st = s->streams[stream_index];
  442.     APEContext *ape = s->priv_data;
  443.     int index = av_index_search_timestamp(st, timestamp, flags);
  444.  
  445.     if (index < 0)
  446.         return -1;
  447.  
  448.     if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
  449.         return -1;
  450.     ape->currentframe = index;
  451.     return 0;
  452. }
  453.  
  454. AVInputFormat ff_ape_demuxer = {
  455.     .name           = "ape",
  456.     .long_name      = NULL_IF_CONFIG_SMALL("Monkey's Audio"),
  457.     .priv_data_size = sizeof(APEContext),
  458.     .read_probe     = ape_probe,
  459.     .read_header    = ape_read_header,
  460.     .read_packet    = ape_read_packet,
  461.     .read_close     = ape_read_close,
  462.     .read_seek      = ape_read_seek,
  463.     .extensions     = "ape,apl,mac",
  464. };
  465.