/*

* Monkey's Audio APE demuxer

* Copyright (c) 2007 Benjamin Zores <ben@geexbox.org>

* based upon libdemac from Dave Chapman.

*

* This file is part of Libav.

*

* Libav is free software; you can redistribute it and/or

* modify it under the terms of the GNU Lesser General Public

* License as published by the Free Software Foundation; either

* version 2.1 of the License, or (at your option) any later version.

*

* Libav is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

* Lesser General Public License for more details.

*

* You should have received a copy of the GNU Lesser General Public

* License along with Libav; if not, write to the Free Software

* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

*/

#include <stdio.h>

#include "libavutil/intreadwrite.h"

#include "avformat.h"

#include "internal.h"

#include "apetag.h"

/* The earliest and latest file formats supported by this library */

#define APE_MIN_VERSION 3800

#define APE_MAX_VERSION 3990

#define MAC_FORMAT_FLAG_8_BIT 1 // is 8-bit [OBSOLETE]

#define MAC_FORMAT_FLAG_CRC 2 // uses the new CRC32 error detection [OBSOLETE]

#define MAC_FORMAT_FLAG_HAS_PEAK_LEVEL 4 // uint32 nPeakLevel after the header [OBSOLETE]

#define MAC_FORMAT_FLAG_24_BIT 8 // is 24-bit [OBSOLETE]

#define MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS 16 // has the number of seek elements after the peak level

#define MAC_FORMAT_FLAG_CREATE_WAV_HEADER 32 // create the wave header on decompression (not stored)

#define MAC_SUBFRAME_SIZE 4608

#define APE_EXTRADATA_SIZE 6

typedef struct APEFrame {

} APEFrame;

typedef struct APEContext {

} APEContext;

static int ape_probe(AVProbeData * p)

{

if (p->buf[0] == 'M' && p->buf[1] == 'A' && p->buf[2] == 'C' && p->buf[3] == ' ')

return AVPROBE_SCORE_MAX;

return 0;

}

#ifdef DEBUG

static void ape_dumpinfo(AVFormatContext * s, APEContext * ape_ctx)

{

int i;

av_log(s, AV_LOG_DEBUG, "Descriptor Block:\n\n");

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]);

av_log(s, AV_LOG_DEBUG, "fileversion = %"PRId16"\n", ape_ctx->fileversion);

av_log(s, AV_LOG_DEBUG, "descriptorlength = %"PRIu32"\n", ape_ctx->descriptorlength);

av_log(s, AV_LOG_DEBUG, "headerlength = %"PRIu32"\n", ape_ctx->headerlength);

av_log(s, AV_LOG_DEBUG, "seektablelength = %"PRIu32"\n", ape_ctx->seektablelength);

av_log(s, AV_LOG_DEBUG, "wavheaderlength = %"PRIu32"\n", ape_ctx->wavheaderlength);

av_log(s, AV_LOG_DEBUG, "audiodatalength = %"PRIu32"\n", ape_ctx->audiodatalength);

av_log(s, AV_LOG_DEBUG, "audiodatalength_high = %"PRIu32"\n", ape_ctx->audiodatalength_high);

av_log(s, AV_LOG_DEBUG, "wavtaillength = %"PRIu32"\n", ape_ctx->wavtaillength);

av_log(s, AV_LOG_DEBUG, "md5 = ");

for (i = 0; i < 16; i++)

av_log(s, AV_LOG_DEBUG, "%02x", ape_ctx->md5[i]);

av_log(s, AV_LOG_DEBUG, "\n");

av_log(s, AV_LOG_DEBUG, "\nHeader Block:\n\n");

av_log(s, AV_LOG_DEBUG, "compressiontype = %"PRIu16"\n", ape_ctx->compressiontype);

av_log(s, AV_LOG_DEBUG, "formatflags = %"PRIu16"\n", ape_ctx->formatflags);

av_log(s, AV_LOG_DEBUG, "blocksperframe = %"PRIu32"\n", ape_ctx->blocksperframe);

av_log(s, AV_LOG_DEBUG, "finalframeblocks = %"PRIu32"\n", ape_ctx->finalframeblocks);

av_log(s, AV_LOG_DEBUG, "totalframes = %"PRIu32"\n", ape_ctx->totalframes);

av_log(s, AV_LOG_DEBUG, "bps = %"PRIu16"\n", ape_ctx->bps);

av_log(s, AV_LOG_DEBUG, "channels = %"PRIu16"\n", ape_ctx->channels);

av_log(s, AV_LOG_DEBUG, "samplerate = %"PRIu32"\n", ape_ctx->samplerate);

av_log(s, AV_LOG_DEBUG, "\nSeektable\n\n");

if ((ape_ctx->seektablelength / sizeof(uint32_t)) != ape_ctx->totalframes) {

av_log(s, AV_LOG_DEBUG, "No seektable\n");

} else {

for (i = 0; i < ape_ctx->seektablelength / sizeof(uint32_t); i++) {

if (i < ape_ctx->totalframes - 1) {

av_log(s, AV_LOG_DEBUG, "%8d %"PRIu32" (%"PRIu32" bytes)",

i, ape_ctx->seektable[i],

ape_ctx->seektable[i + 1] - ape_ctx->seektable[i]);

if (ape_ctx->bittable)

av_log(s, AV_LOG_DEBUG, " + %2d bits\n",

ape_ctx->bittable[i]);

av_log(s, AV_LOG_DEBUG, "\n");

} else {

av_log(s, AV_LOG_DEBUG, "%8d %"PRIu32"\n", i, ape_ctx->seektable[i]);

}

}

}

av_log(s, AV_LOG_DEBUG, "\nFrames\n\n");

for (i = 0; i < ape_ctx->totalframes; i++)

av_log(s, AV_LOG_DEBUG, "%8d %8"PRId64" %8d (%d samples)\n", i,

ape_ctx->frames[i].pos, ape_ctx->frames[i].size,

ape_ctx->frames[i].nblocks);

av_log(s, AV_LOG_DEBUG, "\nCalculated information:\n\n");

av_log(s, AV_LOG_DEBUG, "junklength = %"PRIu32"\n", ape_ctx->junklength);

av_log(s, AV_LOG_DEBUG, "firstframe = %"PRIu32"\n", ape_ctx->firstframe);

av_log(s, AV_LOG_DEBUG, "totalsamples = %"PRIu32"\n", ape_ctx->totalsamples);

}

#else

#define ape_dumpinfo(s, ape_ctx) do {} while(0)

#endif

static int ape_read_header(AVFormatContext * s)

{

AVIOContext *pb = s->pb;

APEContext *ape = s->priv_data;

AVStream *st;

uint32_t tag;

int i;

int total_blocks, final_size = 0;

int64_t pts, file_size;

/* Skip any leading junk such as id3v2 tags */

ape->junklength = avio_tell(pb);

tag = avio_rl32(pb);

if (tag != MKTAG('M', 'A', 'C', ' '))

return -1;

ape->fileversion = avio_rl16(pb);

if (ape->fileversion < APE_MIN_VERSION || ape->fileversion > APE_MAX_VERSION) {

av_log(s, AV_LOG_ERROR, "Unsupported file version - %d.%02d\n",

ape->fileversion / 1000, (ape->fileversion % 1000) / 10);

return -1;

}

if (ape->fileversion >= 3980) {

ape->padding1 = avio_rl16(pb);

ape->descriptorlength = avio_rl32(pb);

ape->headerlength = avio_rl32(pb);

ape->seektablelength = avio_rl32(pb);

ape->wavheaderlength = avio_rl32(pb);

ape->audiodatalength = avio_rl32(pb);

ape->audiodatalength_high = avio_rl32(pb);

ape->wavtaillength = avio_rl32(pb);

avio_read(pb, ape->md5, 16);

/* Skip any unknown bytes at the end of the descriptor.

This is for future compatibility */

if (ape->descriptorlength > 52)

avio_skip(pb, ape->descriptorlength - 52);

/* Read header data */

ape->compressiontype = avio_rl16(pb);

ape->formatflags = avio_rl16(pb);

ape->blocksperframe = avio_rl32(pb);

ape->finalframeblocks = avio_rl32(pb);

ape->totalframes = avio_rl32(pb);

ape->bps = avio_rl16(pb);

ape->channels = avio_rl16(pb);

ape->samplerate = avio_rl32(pb);

} else {

ape->descriptorlength = 0;

ape->headerlength = 32;

ape->compressiontype = avio_rl16(pb);

ape->formatflags = avio_rl16(pb);

ape->channels = avio_rl16(pb);

ape->samplerate = avio_rl32(pb);

ape->wavheaderlength = avio_rl32(pb);

ape->wavtaillength = avio_rl32(pb);

ape->totalframes = avio_rl32(pb);

ape->finalframeblocks = avio_rl32(pb);

if (ape->formatflags & MAC_FORMAT_FLAG_HAS_PEAK_LEVEL) {

avio_skip(pb, 4); /* Skip the peak level */

ape->headerlength += 4;

}

if (ape->formatflags & MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS) {

ape->seektablelength = avio_rl32(pb);

ape->headerlength += 4;

ape->seektablelength *= sizeof(int32_t);

} else

ape->seektablelength = ape->totalframes * sizeof(int32_t);

if (ape->formatflags & MAC_FORMAT_FLAG_8_BIT)

ape->bps = 8;

else if (ape->formatflags & MAC_FORMAT_FLAG_24_BIT)

ape->bps = 24;

else

ape->bps = 16;

if (ape->fileversion >= 3950)

ape->blocksperframe = 73728 * 4;

else if (ape->fileversion >= 3900 || (ape->fileversion >= 3800 && ape->compressiontype >= 4000))

ape->blocksperframe = 73728;

else

ape->blocksperframe = 9216;

/* Skip any stored wav header */

if (!(ape->formatflags & MAC_FORMAT_FLAG_CREATE_WAV_HEADER))

avio_skip(pb, ape->wavheaderlength);

}

if(!ape->totalframes){

av_log(s, AV_LOG_ERROR, "No frames in the file!\n");

return AVERROR(EINVAL);

}

if(ape->totalframes > UINT_MAX / sizeof(APEFrame)){

av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n",

ape->totalframes);

return -1;

}

if (ape->seektablelength / sizeof(*ape->seektable) < ape->totalframes) {

av_log(s, AV_LOG_ERROR,

"Number of seek entries is less than number of frames: %zu vs. %"PRIu32"\n",

ape->seektablelength / sizeof(*ape->seektable), ape->totalframes);

return AVERROR_INVALIDDATA;

}

ape->frames = av_malloc(ape->totalframes * sizeof(APEFrame));

if(!ape->frames)

return AVERROR(ENOMEM);

ape->firstframe = ape->junklength + ape->descriptorlength + ape->headerlength + ape->seektablelength + ape->wavheaderlength;

if (ape->fileversion < 3810)

ape->firstframe += ape->totalframes;

ape->currentframe = 0;

ape->totalsamples = ape->finalframeblocks;

if (ape->totalframes > 1)

ape->totalsamples += ape->blocksperframe * (ape->totalframes - 1);

if (ape->seektablelength > 0) {

ape->seektable = av_malloc(ape->seektablelength);

if (!ape->seektable)

return AVERROR(ENOMEM);

for (i = 0; i < ape->seektablelength / sizeof(uint32_t) && !pb->eof_reached; i++)

ape->seektable[i] = avio_rl32(pb);

if (ape->fileversion < 3810) {

ape->bittable = av_malloc(ape->totalframes);

if (!ape->bittable)

return AVERROR(ENOMEM);

for (i = 0; i < ape->totalframes && !pb->eof_reached; i++)

ape->bittable[i] = avio_r8(pb);

}

}

ape->frames[0].pos = ape->firstframe;

ape->frames[0].nblocks = ape->blocksperframe;

ape->frames[0].skip = 0;

for (i = 1; i < ape->totalframes; i++) {

ape->frames[i].pos = ape->seektable[i] + ape->junklength;

ape->frames[i].nblocks = ape->blocksperframe;

ape->frames[i - 1].size = ape->frames[i].pos - ape->frames[i - 1].pos;

ape->frames[i].skip = (ape->frames[i].pos - ape->frames[0].pos) & 3;

}

ape->frames[ape->totalframes - 1].nblocks = ape->finalframeblocks;

/* calculate final packet size from total file size, if available */

file_size = avio_size(pb);

if (file_size > 0) {

final_size = file_size - ape->frames[ape->totalframes - 1].pos -

ape->wavtaillength;

final_size -= final_size & 3;

}

if (file_size <= 0 || final_size <= 0)

final_size = ape->finalframeblocks * 8;

ape->frames[ape->totalframes - 1].size = final_size;

for (i = 0; i < ape->totalframes; i++) {

if(ape->frames[i].skip){

ape->frames[i].pos -= ape->frames[i].skip;

ape->frames[i].size += ape->frames[i].skip;

}

ape->frames[i].size = (ape->frames[i].size + 3) & ~3;

}

if (ape->fileversion < 3810) {

for (i = 0; i < ape->totalframes; i++) {

if (i < ape->totalframes - 1 && ape->bittable[i + 1])

ape->frames[i].size += 4;

ape->frames[i].skip <<= 3;

ape->frames[i].skip += ape->bittable[i];

}

}

ape_dumpinfo(s, ape);

av_log(s, AV_LOG_DEBUG, "Decoding file - v%d.%02d, compression level %"PRIu16"\n",

ape->fileversion / 1000, (ape->fileversion % 1000) / 10,

ape->compressiontype);

/* now we are ready: build format streams */

st = avformat_new_stream(s, NULL);

if (!st)

return -1;

total_blocks = (ape->totalframes == 0) ? 0 : ((ape->totalframes - 1) * ape->blocksperframe) + ape->finalframeblocks;

st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;

st->codecpar->codec_id = AV_CODEC_ID_APE;

st->codecpar->codec_tag = MKTAG('A', 'P', 'E', ' ');

st->codecpar->channels = ape->channels;

st->codecpar->sample_rate = ape->samplerate;

st->codecpar->bits_per_coded_sample = ape->bps;

st->nb_frames = ape->totalframes;

st->start_time = 0;

st->duration = total_blocks / MAC_SUBFRAME_SIZE;

avpriv_set_pts_info(st, 64, MAC_SUBFRAME_SIZE, ape->samplerate);

st->codecpar->extradata = av_malloc(APE_EXTRADATA_SIZE);

st->codecpar->extradata_size = APE_EXTRADATA_SIZE;

AV_WL16(st->codecpar->extradata + 0, ape->fileversion);

AV_WL16(st->codecpar->extradata + 2, ape->compressiontype);

AV_WL16(st->codecpar->extradata + 4, ape->formatflags);

pts = 0;

for (i = 0; i < ape->totalframes; i++) {

ape->frames[i].pts = pts;

av_add_index_entry(st, ape->frames[i].pos, ape->frames[i].pts, 0, 0, AVINDEX_KEYFRAME);

pts += ape->blocksperframe / MAC_SUBFRAME_SIZE;

}

/* try to read APE tags */

if (pb->seekable & AVIO_SEEKABLE_NORMAL) {

ff_ape_parse_tag(s);

avio_seek(pb, 0, SEEK_SET);

}

return 0;

}

static int ape_read_packet(AVFormatContext * s, AVPacket * pkt)

{

int ret;

int nblocks;

APEContext *ape = s->priv_data;

uint32_t extra_size = 8;

if (s->pb->eof_reached)

return AVERROR_EOF;

if (ape->currentframe >= ape->totalframes)

return AVERROR_EOF;

if (avio_seek(s->pb, ape->frames[ape->currentframe].pos, SEEK_SET) < 0)

return AVERROR(EIO);

/* Calculate how many blocks there are in this frame */

if (ape->currentframe == (ape->totalframes - 1))

nblocks = ape->finalframeblocks;

else

nblocks = ape->blocksperframe;

if (ape->frames[ape->currentframe].size <= 0 ||

ape->frames[ape->currentframe].size > INT_MAX - extra_size) {

av_log(s, AV_LOG_ERROR, "invalid packet size: %d\n",

ape->frames[ape->currentframe].size);

ape->currentframe++;

return AVERROR(EIO);

}

if (av_new_packet(pkt, ape->frames[ape->currentframe].size + extra_size) < 0)

return AVERROR(ENOMEM);

AV_WL32(pkt->data , nblocks);

AV_WL32(pkt->data + 4, ape->frames[ape->currentframe].skip);

ret = avio_read(s->pb, pkt->data + extra_size, ape->frames[ape->currentframe].size);

pkt->pts = ape->frames[ape->currentframe].pts;

pkt->stream_index = 0;

/* note: we need to modify the packet size here to handle the last

packet */

pkt->size = ret + extra_size;

ape->currentframe++;

return 0;

}

static int ape_read_close(AVFormatContext * s)

{

APEContext *ape = s->priv_data;

av_freep(&ape->frames);

av_freep(&ape->seektable);

av_freep(&ape->bittable);

return 0;

}

static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)

{

AVStream *st = s->streams[stream_index];

APEContext *ape = s->priv_data;

int index = av_index_search_timestamp(st, timestamp, flags);

if (index < 0)

return -1;

if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)

return -1;

ape->currentframe = index;

return 0;

}

AVInputFormat ff_ape_demuxer = {

.name = "ape",

.long_name = NULL_IF_CONFIG_SMALL("Monkey's Audio"),

.priv_data_size = sizeof(APEContext),

.read_probe = ape_probe,

.read_header = ape_read_header,

.read_packet = ape_read_packet,

.read_close = ape_read_close,

.read_seek = ape_read_seek,

.extensions = "ape,apl,mac",

};