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* Monkey's Audio APE demuxer
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* Copyright (c) 2007 Benjamin Zores <ben@geexbox.org>
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* based upon libdemac from Dave Chapman.
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* This file is part of Libav.
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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#include "libavutil/intreadwrite.h"
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/* The earliest and latest file formats supported by this library */
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#define APE_MIN_VERSION 3950
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#define APE_MAX_VERSION 3990
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#define MAC_FORMAT_FLAG_8_BIT 1 // is 8-bit [OBSOLETE]
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#define MAC_FORMAT_FLAG_CRC 2 // uses the new CRC32 error detection [OBSOLETE]
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#define MAC_FORMAT_FLAG_HAS_PEAK_LEVEL 4 // uint32 nPeakLevel after the header [OBSOLETE]
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#define MAC_FORMAT_FLAG_24_BIT 8 // is 24-bit [OBSOLETE]
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#define MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS 16 // has the number of seek elements after the peak level
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#define MAC_FORMAT_FLAG_CREATE_WAV_HEADER 32 // create the wave header on decompression (not stored)
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#define MAC_SUBFRAME_SIZE 4608
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#define APE_EXTRADATA_SIZE 6
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uint32_t totalsamples;
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/* Info from Descriptor Block */
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uint32_t descriptorlength;
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uint32_t headerlength;
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uint32_t seektablelength;
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uint32_t wavheaderlength;
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uint32_t audiodatalength;
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uint32_t audiodatalength_high;
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uint32_t wavtaillength;
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/* Info from Header Block */
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uint16_t compressiontype;
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uint32_t blocksperframe;
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uint32_t finalframeblocks;
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static int ape_probe(AVProbeData * p)
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if (p->buf[0] == 'M' && p->buf[1] == 'A' && p->buf[2] == 'C' && p->buf[3] == ' ')
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return AVPROBE_SCORE_MAX;
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static void ape_dumpinfo(AVFormatContext * s, APEContext * ape_ctx)
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av_log(s, AV_LOG_DEBUG, "Descriptor Block:\n\n");
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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]);
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av_log(s, AV_LOG_DEBUG, "fileversion = %"PRId16"\n", ape_ctx->fileversion);
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av_log(s, AV_LOG_DEBUG, "descriptorlength = %"PRIu32"\n", ape_ctx->descriptorlength);
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av_log(s, AV_LOG_DEBUG, "headerlength = %"PRIu32"\n", ape_ctx->headerlength);
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av_log(s, AV_LOG_DEBUG, "seektablelength = %"PRIu32"\n", ape_ctx->seektablelength);
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av_log(s, AV_LOG_DEBUG, "wavheaderlength = %"PRIu32"\n", ape_ctx->wavheaderlength);
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av_log(s, AV_LOG_DEBUG, "audiodatalength = %"PRIu32"\n", ape_ctx->audiodatalength);
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av_log(s, AV_LOG_DEBUG, "audiodatalength_high = %"PRIu32"\n", ape_ctx->audiodatalength_high);
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av_log(s, AV_LOG_DEBUG, "wavtaillength = %"PRIu32"\n", ape_ctx->wavtaillength);
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av_log(s, AV_LOG_DEBUG, "md5 = ");
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for (i = 0; i < 16; i++)
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av_log(s, AV_LOG_DEBUG, "%02x", ape_ctx->md5[i]);
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av_log(s, AV_LOG_DEBUG, "\n");
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av_log(s, AV_LOG_DEBUG, "\nHeader Block:\n\n");
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av_log(s, AV_LOG_DEBUG, "compressiontype = %"PRIu16"\n", ape_ctx->compressiontype);
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av_log(s, AV_LOG_DEBUG, "formatflags = %"PRIu16"\n", ape_ctx->formatflags);
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av_log(s, AV_LOG_DEBUG, "blocksperframe = %"PRIu32"\n", ape_ctx->blocksperframe);
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av_log(s, AV_LOG_DEBUG, "finalframeblocks = %"PRIu32"\n", ape_ctx->finalframeblocks);
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av_log(s, AV_LOG_DEBUG, "totalframes = %"PRIu32"\n", ape_ctx->totalframes);
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av_log(s, AV_LOG_DEBUG, "bps = %"PRIu16"\n", ape_ctx->bps);
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av_log(s, AV_LOG_DEBUG, "channels = %"PRIu16"\n", ape_ctx->channels);
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av_log(s, AV_LOG_DEBUG, "samplerate = %"PRIu32"\n", ape_ctx->samplerate);
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av_log(s, AV_LOG_DEBUG, "\nSeektable\n\n");
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if ((ape_ctx->seektablelength / sizeof(uint32_t)) != ape_ctx->totalframes) {
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av_log(s, AV_LOG_DEBUG, "No seektable\n");
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for (i = 0; i < ape_ctx->seektablelength / sizeof(uint32_t); i++) {
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if (i < ape_ctx->totalframes - 1) {
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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]);
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av_log(s, AV_LOG_DEBUG, "%8d %d\n", i, ape_ctx->seektable[i]);
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av_log(s, AV_LOG_DEBUG, "\nFrames\n\n");
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for (i = 0; i < ape_ctx->totalframes; i++)
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av_log(s, AV_LOG_DEBUG, "%8d %8"PRId64" %8d (%d samples)\n", i,
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ape_ctx->frames[i].pos, ape_ctx->frames[i].size,
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ape_ctx->frames[i].nblocks);
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av_log(s, AV_LOG_DEBUG, "\nCalculated information:\n\n");
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av_log(s, AV_LOG_DEBUG, "junklength = %"PRIu32"\n", ape_ctx->junklength);
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av_log(s, AV_LOG_DEBUG, "firstframe = %"PRIu32"\n", ape_ctx->firstframe);
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av_log(s, AV_LOG_DEBUG, "totalsamples = %"PRIu32"\n", ape_ctx->totalsamples);
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static int ape_read_header(AVFormatContext * s, AVFormatParameters * ap)
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AVIOContext *pb = s->pb;
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APEContext *ape = s->priv_data;
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/* Skip any leading junk such as id3v2 tags */
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ape->junklength = avio_tell(pb);
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if (tag != MKTAG('M', 'A', 'C', ' '))
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ape->fileversion = avio_rl16(pb);
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if (ape->fileversion < APE_MIN_VERSION || ape->fileversion > APE_MAX_VERSION) {
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av_log(s, AV_LOG_ERROR, "Unsupported file version - %"PRId16".%02"PRId16"\n",
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ape->fileversion / 1000, (ape->fileversion % 1000) / 10);
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if (ape->fileversion >= 3980) {
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ape->padding1 = avio_rl16(pb);
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ape->descriptorlength = avio_rl32(pb);
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ape->headerlength = avio_rl32(pb);
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ape->seektablelength = avio_rl32(pb);
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ape->wavheaderlength = avio_rl32(pb);
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ape->audiodatalength = avio_rl32(pb);
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ape->audiodatalength_high = avio_rl32(pb);
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ape->wavtaillength = avio_rl32(pb);
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avio_read(pb, ape->md5, 16);
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/* Skip any unknown bytes at the end of the descriptor.
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This is for future compatibility */
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if (ape->descriptorlength > 52)
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avio_skip(pb, ape->descriptorlength - 52);
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/* Read header data */
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ape->compressiontype = avio_rl16(pb);
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ape->formatflags = avio_rl16(pb);
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ape->blocksperframe = avio_rl32(pb);
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ape->finalframeblocks = avio_rl32(pb);
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ape->totalframes = avio_rl32(pb);
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ape->bps = avio_rl16(pb);
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ape->channels = avio_rl16(pb);
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ape->samplerate = avio_rl32(pb);
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ape->descriptorlength = 0;
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ape->headerlength = 32;
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ape->compressiontype = avio_rl16(pb);
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ape->formatflags = avio_rl16(pb);
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ape->channels = avio_rl16(pb);
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ape->samplerate = avio_rl32(pb);
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ape->wavheaderlength = avio_rl32(pb);
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ape->wavtaillength = avio_rl32(pb);
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ape->totalframes = avio_rl32(pb);
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ape->finalframeblocks = avio_rl32(pb);
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if (ape->formatflags & MAC_FORMAT_FLAG_HAS_PEAK_LEVEL) {
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avio_skip(pb, 4); /* Skip the peak level */
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ape->headerlength += 4;
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if (ape->formatflags & MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS) {
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ape->seektablelength = avio_rl32(pb);
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ape->headerlength += 4;
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ape->seektablelength *= sizeof(int32_t);
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ape->seektablelength = ape->totalframes * sizeof(int32_t);
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if (ape->formatflags & MAC_FORMAT_FLAG_8_BIT)
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else if (ape->formatflags & MAC_FORMAT_FLAG_24_BIT)
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if (ape->fileversion >= 3950)
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ape->blocksperframe = 73728 * 4;
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else if (ape->fileversion >= 3900 || (ape->fileversion >= 3800 && ape->compressiontype >= 4000))
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ape->blocksperframe = 73728;
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ape->blocksperframe = 9216;
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/* Skip any stored wav header */
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if (!(ape->formatflags & MAC_FORMAT_FLAG_CREATE_WAV_HEADER))
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avio_skip(pb, ape->wavheaderlength);
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if(!ape->totalframes){
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av_log(s, AV_LOG_ERROR, "No frames in the file!\n");
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return AVERROR(EINVAL);
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if(ape->totalframes > UINT_MAX / sizeof(APEFrame)){
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av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n",
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if (ape->seektablelength && (ape->seektablelength / sizeof(*ape->seektable)) < ape->totalframes) {
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av_log(s, AV_LOG_ERROR, "Number of seek entries is less than number of frames: %ld vs. %"PRIu32"\n",
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ape->seektablelength / sizeof(*ape->seektable), ape->totalframes);
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return AVERROR_INVALIDDATA;
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ape->frames = av_malloc(ape->totalframes * sizeof(APEFrame));
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return AVERROR(ENOMEM);
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ape->firstframe = ape->junklength + ape->descriptorlength + ape->headerlength + ape->seektablelength + ape->wavheaderlength;
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ape->currentframe = 0;
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ape->totalsamples = ape->finalframeblocks;
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if (ape->totalframes > 1)
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ape->totalsamples += ape->blocksperframe * (ape->totalframes - 1);
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if (ape->seektablelength > 0) {
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ape->seektable = av_malloc(ape->seektablelength);
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for (i = 0; i < ape->seektablelength / sizeof(uint32_t); i++)
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ape->seektable[i] = avio_rl32(pb);
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ape->frames[0].pos = ape->firstframe;
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ape->frames[0].nblocks = ape->blocksperframe;
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ape->frames[0].skip = 0;
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for (i = 1; i < ape->totalframes; i++) {
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ape->frames[i].pos = ape->seektable[i] + ape->junklength;
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ape->frames[i].nblocks = ape->blocksperframe;
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ape->frames[i - 1].size = ape->frames[i].pos - ape->frames[i - 1].pos;
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ape->frames[i].skip = (ape->frames[i].pos - ape->frames[0].pos) & 3;
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ape->frames[ape->totalframes - 1].size = ape->finalframeblocks * 4;
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ape->frames[ape->totalframes - 1].nblocks = ape->finalframeblocks;
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for (i = 0; i < ape->totalframes; i++) {
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if(ape->frames[i].skip){
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ape->frames[i].pos -= ape->frames[i].skip;
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ape->frames[i].size += ape->frames[i].skip;
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ape->frames[i].size = (ape->frames[i].size + 3) & ~3;
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ape_dumpinfo(s, ape);
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/* try to read APE tags */
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avio_seek(pb, 0, SEEK_SET);
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av_log(s, AV_LOG_DEBUG, "Decoding file - v%d.%02d, compression level %"PRIu16"\n",
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ape->fileversion / 1000, (ape->fileversion % 1000) / 10,
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ape->compressiontype);
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/* now we are ready: build format streams */
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st = av_new_stream(s, 0);
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total_blocks = (ape->totalframes == 0) ? 0 : ((ape->totalframes - 1) * ape->blocksperframe) + ape->finalframeblocks;
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->codec_id = CODEC_ID_APE;
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st->codec->codec_tag = MKTAG('A', 'P', 'E', ' ');
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st->codec->channels = ape->channels;
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st->codec->sample_rate = ape->samplerate;
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st->codec->bits_per_coded_sample = ape->bps;
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st->codec->frame_size = MAC_SUBFRAME_SIZE;
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st->nb_frames = ape->totalframes;
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st->duration = total_blocks / MAC_SUBFRAME_SIZE;
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av_set_pts_info(st, 64, MAC_SUBFRAME_SIZE, ape->samplerate);
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st->codec->extradata = av_malloc(APE_EXTRADATA_SIZE);
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st->codec->extradata_size = APE_EXTRADATA_SIZE;
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AV_WL16(st->codec->extradata + 0, ape->fileversion);
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AV_WL16(st->codec->extradata + 2, ape->compressiontype);
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AV_WL16(st->codec->extradata + 4, ape->formatflags);
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for (i = 0; i < ape->totalframes; i++) {
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ape->frames[i].pts = pts;
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av_add_index_entry(st, ape->frames[i].pos, ape->frames[i].pts, 0, 0, AVINDEX_KEYFRAME);
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pts += ape->blocksperframe / MAC_SUBFRAME_SIZE;
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static int ape_read_packet(AVFormatContext * s, AVPacket * pkt)
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APEContext *ape = s->priv_data;
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uint32_t extra_size = 8;
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if (s->pb->eof_reached)
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if (ape->currentframe > ape->totalframes)
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avio_seek (s->pb, ape->frames[ape->currentframe].pos, SEEK_SET);
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/* Calculate how many blocks there are in this frame */
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if (ape->currentframe == (ape->totalframes - 1))
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nblocks = ape->finalframeblocks;
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nblocks = ape->blocksperframe;
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if (av_new_packet(pkt, ape->frames[ape->currentframe].size + extra_size) < 0)
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return AVERROR(ENOMEM);
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AV_WL32(pkt->data , nblocks);
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AV_WL32(pkt->data + 4, ape->frames[ape->currentframe].skip);
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ret = avio_read(s->pb, pkt->data + extra_size, ape->frames[ape->currentframe].size);
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pkt->pts = ape->frames[ape->currentframe].pts;
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pkt->stream_index = 0;
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/* note: we need to modify the packet size here to handle the last
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pkt->size = ret + extra_size;
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static int ape_read_close(AVFormatContext * s)
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APEContext *ape = s->priv_data;
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av_freep(&ape->frames);
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av_freep(&ape->seektable);
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static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
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AVStream *st = s->streams[stream_index];
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APEContext *ape = s->priv_data;
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int index = av_index_search_timestamp(st, timestamp, flags);
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ape->currentframe = index;
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AVInputFormat ff_ape_demuxer = {
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NULL_IF_CONFIG_SMALL("Monkey's Audio"),
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.extensions = "ape,apl,mac"