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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 APEFrame {
  44.     int64_t pos;
  45.     int nblocks;
  46.     int size;
  47.     int skip;
  48.     int64_t pts;
  49. } APEFrame;
  50.  
  51. typedef 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.     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_array(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. };
  473.