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FFmpeg/libavformat/ape.c

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/*
* Monkey's Audio APE demuxer
* Copyright (c) 2007 Benjamin Zores <ben@geexbox.org>
* based upon libdemac from Dave Chapman.
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include "avformat.h"
#define ENABLE_DEBUG 0
/* The earliest and latest file formats supported by this library */
#define APE_MIN_VERSION 3950
#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
/* APE tags */
#define APE_TAG_VERSION 2000
#define APE_TAG_FOOTER_BYTES 32
#define APE_TAG_FLAG_CONTAINS_HEADER (1 << 31)
#define APE_TAG_FLAG_IS_HEADER (1 << 29)
#define TAG(name, field) {name, offsetof(AVFormatContext, field), sizeof(((AVFormatContext *)0)->field)}
static const struct {
char *name;
int offset;
int size;
} tags[] = {
TAG("Title" , title ),
TAG("Artist" , author ),
TAG("Copyright", copyright),
TAG("Comment" , comment ),
TAG("Album" , album ),
TAG("Year" , year ),
TAG("Track" , track ),
TAG("Genre" , genre ),
{ NULL }
};
typedef struct {
int64_t pos;
int nblocks;
int size;
int skip;
int64_t pts;
} APEFrame;
typedef struct {
/* Derived fields */
uint32_t junklength;
uint32_t firstframe;
uint32_t totalsamples;
int currentframe;
APEFrame *frames;
/* Info from Descriptor Block */
char magic[4];
int16_t fileversion;
int16_t padding1;
uint32_t descriptorlength;
uint32_t headerlength;
uint32_t seektablelength;
uint32_t wavheaderlength;
uint32_t audiodatalength;
uint32_t audiodatalength_high;
uint32_t wavtaillength;
uint8_t md5[16];
/* Info from Header Block */
uint16_t compressiontype;
uint16_t formatflags;
uint32_t blocksperframe;
uint32_t finalframeblocks;
uint32_t totalframes;
uint16_t bps;
uint16_t channels;
uint32_t samplerate;
/* Seektable */
uint32_t *seektable;
} APEContext;
static void ape_tag_read_field(AVFormatContext *s)
{
ByteIOContext *pb = s->pb;
uint8_t buf[1024];
uint32_t size;
int i;
memset(buf, 0, 1024);
size = get_le32(pb); /* field size */
url_fskip(pb, 4); /* skip field flags */
for (i=0; pb->buf_ptr[i]!='0' && pb->buf_ptr[i]>=0x20 && pb->buf_ptr[i]<=0x7E; i++);
get_buffer(pb, buf, FFMIN(i, 1024));
url_fskip(pb, 1);
for (i=0; tags[i].name; i++)
if (!strcmp (buf, tags[i].name)) {
if (tags[i].size == sizeof(int)) {
char tmp[16];
get_buffer(pb, tmp, FFMIN(sizeof(tmp), size));
*(int *)(((char *)s)+tags[i].offset) = atoi(tmp);
} else {
get_buffer(pb, ((char *)s) + tags[i].offset,
FFMIN(tags[i].size, size));
}
break;
}
if (!tags[i].name)
url_fskip(pb, size);
}
static void ape_parse_tag(AVFormatContext *s)
{
ByteIOContext *pb = s->pb;
int file_size = url_fsize(pb);
uint32_t val, fields, tag_bytes;
uint8_t buf[8];
int i;
if (file_size < APE_TAG_FOOTER_BYTES)
return;
url_fseek(pb, file_size - APE_TAG_FOOTER_BYTES, SEEK_SET);
get_buffer(pb, buf, 8); /* APETAGEX */
if (strncmp(buf, "APETAGEX", 8)) {
av_log(NULL, AV_LOG_ERROR, "Invalid APE Tags\n");
return;
}
val = get_le32(pb); /* APE tag version */
if (val > APE_TAG_VERSION) {
av_log(NULL, AV_LOG_ERROR, "Unsupported tag version. (>=%d)\n", APE_TAG_VERSION);
return;
}
tag_bytes = get_le32(pb); /* tag size */
if (tag_bytes - APE_TAG_FOOTER_BYTES > (1024 * 1024 * 16)) {
av_log(NULL, AV_LOG_ERROR, "Tag size is way too big\n");
return;
}
fields = get_le32(pb); /* number of fields */
if (fields > 65536) {
av_log(NULL, AV_LOG_ERROR, "Too many tag fields (%d)\n", fields);
return;
}
val = get_le32(pb); /* flags */
if (val & APE_TAG_FLAG_IS_HEADER) {
av_log(NULL, AV_LOG_ERROR, "APE Tag is a header\n");
return;
}
if (val & APE_TAG_FLAG_CONTAINS_HEADER)
tag_bytes += 2*APE_TAG_FOOTER_BYTES;
url_fseek(pb, file_size - tag_bytes, SEEK_SET);
for (i=0; i<fields; i++)
ape_tag_read_field(s);
#if ENABLE_DEBUG
av_log(NULL, AV_LOG_DEBUG, "\nAPE Tags:\n\n");
av_log(NULL, AV_LOG_DEBUG, "title = %s\n", s->title);
av_log(NULL, AV_LOG_DEBUG, "author = %s\n", s->author);
av_log(NULL, AV_LOG_DEBUG, "copyright = %s\n", s->copyright);
av_log(NULL, AV_LOG_DEBUG, "comment = %s\n", s->comment);
av_log(NULL, AV_LOG_DEBUG, "album = %s\n", s->album);
av_log(NULL, AV_LOG_DEBUG, "year = %d\n", s->year);
av_log(NULL, AV_LOG_DEBUG, "track = %d\n", s->track);
av_log(NULL, AV_LOG_DEBUG, "genre = %s\n", s->genre);
#endif
}
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;
}
static void ape_dumpinfo(APEContext * ape_ctx)
{
#if ENABLE_DEBUG
int i;
av_log(NULL, AV_LOG_DEBUG, "Descriptor Block:\n\n");
av_log(NULL, 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(NULL, AV_LOG_DEBUG, "fileversion = %d\n", ape_ctx->fileversion);
av_log(NULL, AV_LOG_DEBUG, "descriptorlength = %d\n", ape_ctx->descriptorlength);
av_log(NULL, AV_LOG_DEBUG, "headerlength = %d\n", ape_ctx->headerlength);
av_log(NULL, AV_LOG_DEBUG, "seektablelength = %d\n", ape_ctx->seektablelength);
av_log(NULL, AV_LOG_DEBUG, "wavheaderlength = %d\n", ape_ctx->wavheaderlength);
av_log(NULL, AV_LOG_DEBUG, "audiodatalength = %d\n", ape_ctx->audiodatalength);
av_log(NULL, AV_LOG_DEBUG, "audiodatalength_high = %d\n", ape_ctx->audiodatalength_high);
av_log(NULL, AV_LOG_DEBUG, "wavtaillength = %d\n", ape_ctx->wavtaillength);
av_log(NULL, AV_LOG_DEBUG, "md5 = ");
for (i = 0; i < 16; i++)
av_log(NULL, AV_LOG_DEBUG, "%02x", ape_ctx->md5[i]);
av_log(NULL, AV_LOG_DEBUG, "\n");
av_log(NULL, AV_LOG_DEBUG, "\nHeader Block:\n\n");
av_log(NULL, AV_LOG_DEBUG, "compressiontype = %d\n", ape_ctx->compressiontype);
av_log(NULL, AV_LOG_DEBUG, "formatflags = %d\n", ape_ctx->formatflags);
av_log(NULL, AV_LOG_DEBUG, "blocksperframe = %d\n", ape_ctx->blocksperframe);
av_log(NULL, AV_LOG_DEBUG, "finalframeblocks = %d\n", ape_ctx->finalframeblocks);
av_log(NULL, AV_LOG_DEBUG, "totalframes = %d\n", ape_ctx->totalframes);
av_log(NULL, AV_LOG_DEBUG, "bps = %d\n", ape_ctx->bps);
av_log(NULL, AV_LOG_DEBUG, "channels = %d\n", ape_ctx->channels);
av_log(NULL, AV_LOG_DEBUG, "samplerate = %d\n", ape_ctx->samplerate);
av_log(NULL, AV_LOG_DEBUG, "\nSeektable\n\n");
if ((ape_ctx->seektablelength / sizeof(uint32_t)) != ape_ctx->totalframes) {
av_log(NULL, 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(NULL, AV_LOG_DEBUG, "%8d %d (%d bytes)\n", i, ape_ctx->seektable[i], ape_ctx->seektable[i + 1] - ape_ctx->seektable[i]);
} else {
av_log(NULL, AV_LOG_DEBUG, "%8d %d\n", i, ape_ctx->seektable[i]);
}
}
}
av_log(NULL, AV_LOG_DEBUG, "\nFrames\n\n");
for (i = 0; i < ape_ctx->totalframes; i++)
av_log(NULL, 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);
av_log(NULL, AV_LOG_DEBUG, "\nCalculated information:\n\n");
av_log(NULL, AV_LOG_DEBUG, "junklength = %d\n", ape_ctx->junklength);
av_log(NULL, AV_LOG_DEBUG, "firstframe = %d\n", ape_ctx->firstframe);
av_log(NULL, AV_LOG_DEBUG, "totalsamples = %d\n", ape_ctx->totalsamples);
#endif
}
static int ape_read_header(AVFormatContext * s, AVFormatParameters * ap)
{
ByteIOContext *pb = s->pb;
APEContext *ape = s->priv_data;
AVStream *st;
uint32_t tag;
int i;
int total_blocks;
int64_t pts;
/* TODO: Skip any leading junk such as id3v2 tags */
ape->junklength = 0;
tag = get_le32(pb);
if (tag != MKTAG('M', 'A', 'C', ' '))
return -1;
ape->fileversion = get_le16(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 = get_le16(pb);
ape->descriptorlength = get_le32(pb);
ape->headerlength = get_le32(pb);
ape->seektablelength = get_le32(pb);
ape->wavheaderlength = get_le32(pb);
ape->audiodatalength = get_le32(pb);
ape->audiodatalength_high = get_le32(pb);
ape->wavtaillength = get_le32(pb);
get_buffer(pb, ape->md5, 16);
/* Skip any unknown bytes at the end of the descriptor.
This is for future compatibility */
if (ape->descriptorlength > 52)
url_fseek(pb, ape->descriptorlength - 52, SEEK_CUR);
/* Read header data */
ape->compressiontype = get_le16(pb);
ape->formatflags = get_le16(pb);
ape->blocksperframe = get_le32(pb);
ape->finalframeblocks = get_le32(pb);
ape->totalframes = get_le32(pb);
ape->bps = get_le16(pb);
ape->channels = get_le16(pb);
ape->samplerate = get_le32(pb);
} else {
ape->descriptorlength = 0;
ape->headerlength = 32;
ape->compressiontype = get_le16(pb);
ape->formatflags = get_le16(pb);
ape->channels = get_le16(pb);
ape->samplerate = get_le32(pb);
ape->wavheaderlength = get_le32(pb);
ape->wavtaillength = get_le32(pb);
ape->totalframes = get_le32(pb);
ape->finalframeblocks = get_le32(pb);
if (ape->formatflags & MAC_FORMAT_FLAG_HAS_PEAK_LEVEL) {
url_fseek(pb, 4, SEEK_CUR); /* Skip the peak level */
ape->headerlength += 4;
}
if (ape->formatflags & MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS) {
ape->seektablelength = get_le32(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))
url_fskip(pb, ape->wavheaderlength);
}
if(ape->totalframes > UINT_MAX / sizeof(APEFrame)){
av_log(s, AV_LOG_ERROR, "Too many frames: %d\n", ape->totalframes);
return -1;
}
ape->frames = av_malloc(ape->totalframes * sizeof(APEFrame));
if(!ape->frames)
return AVERROR_NOMEM;
ape->firstframe = ape->junklength + ape->descriptorlength + ape->headerlength + ape->seektablelength + ape->wavheaderlength;
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);
for (i = 0; i < ape->seektablelength / sizeof(uint32_t); i++)
ape->seektable[i] = get_le32(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->frames[i-1].pos + ape->blocksperframe;
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].size = ape->finalframeblocks * 4;
ape->frames[ape->totalframes - 1].nblocks = ape->finalframeblocks;
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;
}
ape_dumpinfo(ape);
/* try to read APE tags */
if (!url_is_streamed(pb)) {
ape_parse_tag(s);
url_fseek(pb, 0, SEEK_SET);
}
av_log(s, AV_LOG_DEBUG, "Decoding file - v%d.%02d, compression level %d\n", ape->fileversion / 1000, (ape->fileversion % 1000) / 10, ape->compressiontype);
/* now we are ready: build format streams */
st = av_new_stream(s, 0);
if (!st)
return -1;
total_blocks = (ape->totalframes == 0) ? 0 : ((ape->totalframes - 1) * ape->blocksperframe) + ape->finalframeblocks;
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_APE;
st->codec->codec_tag = MKTAG('A', 'P', 'E', ' ');
st->codec->channels = ape->channels;
st->codec->sample_rate = ape->samplerate;
st->codec->bits_per_sample = ape->bps;
st->codec->frame_size = MAC_SUBFRAME_SIZE;
st->nb_frames = ape->totalframes;
s->start_time = 0;
s->duration = (int64_t) total_blocks * AV_TIME_BASE / ape->samplerate;
av_set_pts_info(st, 64, MAC_SUBFRAME_SIZE, ape->samplerate);
st->codec->extradata = av_malloc(APE_EXTRADATA_SIZE);
st->codec->extradata_size = APE_EXTRADATA_SIZE;
AV_WL16(st->codec->extradata + 0, ape->fileversion);
AV_WL16(st->codec->extradata + 2, ape->compressiontype);
AV_WL16(st->codec->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;
}
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 (url_feof(s->pb))
return AVERROR_IO;
if (ape->currentframe > ape->totalframes)
return AVERROR_IO;
url_fseek (s->pb, ape->frames[ape->currentframe].pos, SEEK_SET);
/* Calculate how many blocks there are in this frame */
if (ape->currentframe == (ape->totalframes - 1))
nblocks = ape->finalframeblocks;
else
nblocks = ape->blocksperframe;
if (av_new_packet(pkt, ape->frames[ape->currentframe].size + extra_size) < 0)
return AVERROR_NOMEM;
AV_WL32(pkt->data , nblocks);
AV_WL32(pkt->data + 4, ape->frames[ape->currentframe].skip);
ret = get_buffer(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);
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;
ape->currentframe = index;
return 0;
}
AVInputFormat ape_demuxer = {
"ape",
"Monkey's Audio",
sizeof(APEContext),
ape_probe,
ape_read_header,
ape_read_packet,
ape_read_close,
ape_read_seek,
.extensions = "ape,apl,mac"
};