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ffmpeg/libavformat/brstm.c

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/*
* BRSTM demuxer
* Copyright (c) 2012 Paul B Mahol
*
* 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 "libavutil/intreadwrite.h"
#include "libavcodec/bytestream.h"
#include "avformat.h"
#include "internal.h"
typedef struct BRSTMDemuxContext {
uint32_t block_size;
uint32_t block_count;
uint32_t current_block;
uint32_t samples_per_block;
uint32_t last_block_used_bytes;
uint8_t *table;
uint8_t *adpc;
} BRSTMDemuxContext;
static int probe(AVProbeData *p)
{
if (AV_RL32(p->buf) == MKTAG('R','S','T','M') &&
(AV_RL16(p->buf + 4) == 0xFFFE ||
AV_RL16(p->buf + 4) == 0xFEFF))
return AVPROBE_SCORE_MAX / 3 * 2;
return 0;
}
static int read_close(AVFormatContext *s)
{
BRSTMDemuxContext *b = s->priv_data;
av_freep(&b->table);
av_freep(&b->adpc);
return 0;
}
static int read_header(AVFormatContext *s)
{
BRSTMDemuxContext *b = s->priv_data;
int bom, major, minor, codec, chunk;
int64_t pos, h1offset, toffset;
uint32_t size, start, asize;
AVStream *st;
int ret = AVERROR_EOF;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
avio_skip(s->pb, 4);
bom = avio_rb16(s->pb);
if (bom != 0xFEFF && bom != 0xFFFE) {
av_log(s, AV_LOG_ERROR, "invalid byte order: %X\n", bom);
return AVERROR_INVALIDDATA;
}
if (bom == 0xFFFE) {
avpriv_request_sample(s, "little endian byte order");
return AVERROR_PATCHWELCOME;
}
major = avio_r8(s->pb);
minor = avio_r8(s->pb);
avio_skip(s->pb, 4); // size of file
size = avio_rb16(s->pb);
if (size < 14)
return AVERROR_INVALIDDATA;
avio_skip(s->pb, size - 14);
pos = avio_tell(s->pb);
if (avio_rl32(s->pb) != MKTAG('H','E','A','D'))
return AVERROR_INVALIDDATA;
size = avio_rb32(s->pb);
if (size < 256)
return AVERROR_INVALIDDATA;
avio_skip(s->pb, 4); // unknown
h1offset = avio_rb32(s->pb);
if (h1offset > size)
return AVERROR_INVALIDDATA;
avio_skip(s->pb, 12);
toffset = avio_rb32(s->pb) + 16LL;
if (toffset > size)
return AVERROR_INVALIDDATA;
avio_skip(s->pb, pos + h1offset + 8 - avio_tell(s->pb));
codec = avio_r8(s->pb);
switch (codec) {
case 0: codec = AV_CODEC_ID_PCM_S8_PLANAR; break;
case 1: codec = AV_CODEC_ID_PCM_S16BE_PLANAR; break;
case 2: codec = AV_CODEC_ID_ADPCM_THP; break;
default:
avpriv_request_sample(s, "codec %d", codec);
return AVERROR_PATCHWELCOME;
}
avio_skip(s->pb, 1); // loop flag
st->codec->codec_id = codec;
st->codec->channels = avio_r8(s->pb);
if (!st->codec->channels)
return AVERROR_INVALIDDATA;
avio_skip(s->pb, 1); // padding
st->codec->sample_rate = avio_rb16(s->pb);
if (!st->codec->sample_rate)
return AVERROR_INVALIDDATA;
avio_skip(s->pb, 2); // padding
avio_skip(s->pb, 4); // loop start sample
st->start_time = 0;
st->duration = avio_rb32(s->pb);
avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
start = avio_rb32(s->pb);
b->current_block = 0;
b->block_count = avio_rb32(s->pb);
if (b->block_count > UINT16_MAX) {
av_log(s, AV_LOG_WARNING, "too many blocks: %u\n", b->block_count);
return AVERROR_INVALIDDATA;
}
b->block_size = avio_rb32(s->pb);
if (b->block_size > UINT16_MAX / st->codec->channels)
return AVERROR_INVALIDDATA;
b->block_size *= st->codec->channels;
b->samples_per_block = avio_rb32(s->pb);
b->last_block_used_bytes = avio_rb32(s->pb);
if (b->last_block_used_bytes > UINT16_MAX / st->codec->channels)
return AVERROR_INVALIDDATA;
b->last_block_used_bytes *= st->codec->channels;
avio_skip(s->pb, 4); // last block samples
avio_skip(s->pb, 4); // last block size
if (codec == AV_CODEC_ID_ADPCM_THP) {
int ch;
avio_skip(s->pb, pos + toffset - avio_tell(s->pb));
toffset = avio_rb32(s->pb) + 16LL;
if (toffset > size)
return AVERROR_INVALIDDATA;
avio_skip(s->pb, pos + toffset - avio_tell(s->pb));
b->table = av_mallocz(32 * st->codec->channels);
if (!b->table)
return AVERROR(ENOMEM);
for (ch = 0; ch < st->codec->channels; ch++) {
if (avio_read(s->pb, b->table + ch * 32, 32) != 32) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
avio_skip(s->pb, 24);
}
}
if (size < (avio_tell(s->pb) - pos)) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
avio_skip(s->pb, size - (avio_tell(s->pb) - pos));
while (!avio_feof(s->pb)) {
chunk = avio_rl32(s->pb);
size = avio_rb32(s->pb);
if (size < 8) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
size -= 8;
switch (chunk) {
case MKTAG('A','D','P','C'):
if (codec != AV_CODEC_ID_ADPCM_THP)
goto skip;
asize = b->block_count * st->codec->channels * 4;
if (size < asize) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
if (b->adpc) {
av_log(s, AV_LOG_WARNING, "skipping additional ADPC chunk\n");
goto skip;
} else {
b->adpc = av_mallocz(asize);
if (!b->adpc) {
ret = AVERROR(ENOMEM);
goto fail;
}
avio_read(s->pb, b->adpc, asize);
avio_skip(s->pb, size - asize);
}
break;
case MKTAG('D','A','T','A'):
if ((start < avio_tell(s->pb)) ||
(!b->adpc && codec == AV_CODEC_ID_ADPCM_THP)) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
avio_skip(s->pb, start - avio_tell(s->pb));
if (major != 1 || minor)
avpriv_request_sample(s, "Version %d.%d", major, minor);
return 0;
default:
av_log(s, AV_LOG_WARNING, "skipping unknown chunk: %X\n", chunk);
skip:
avio_skip(s->pb, size);
}
}
fail:
read_close(s);
return ret;
}
static int read_packet(AVFormatContext *s, AVPacket *pkt)
{
AVCodecContext *codec = s->streams[0]->codec;
BRSTMDemuxContext *b = s->priv_data;
uint32_t samples, size;
int ret;
if (avio_feof(s->pb))
return AVERROR_EOF;
b->current_block++;
if (b->current_block == b->block_count) {
size = b->last_block_used_bytes;
samples = size / (8 * codec->channels) * 14;
} else if (b->current_block < b->block_count) {
size = b->block_size;
samples = b->samples_per_block;
} else {
return AVERROR_EOF;
}
if (codec->codec_id == AV_CODEC_ID_ADPCM_THP) {
uint8_t *dst;
if (av_new_packet(pkt, 8 + (32 + 4) * codec->channels + size) < 0)
return AVERROR(ENOMEM);
dst = pkt->data;
bytestream_put_be32(&dst, size);
bytestream_put_be32(&dst, samples);
bytestream_put_buffer(&dst, b->table, 32 * codec->channels);
bytestream_put_buffer(&dst, b->adpc + 4 * codec->channels *
(b->current_block - 1), 4 * codec->channels);
ret = avio_read(s->pb, dst, size);
if (ret != size)
av_free_packet(pkt);
pkt->duration = samples;
} else {
ret = av_get_packet(s->pb, pkt, size);
}
pkt->stream_index = 0;
if (ret != size)
ret = AVERROR(EIO);
return ret;
}
AVInputFormat ff_brstm_demuxer = {
.name = "brstm",
.long_name = NULL_IF_CONFIG_SMALL("BRSTM (Binary Revolution Stream)"),
.priv_data_size = sizeof(BRSTMDemuxContext),
.read_probe = probe,
.read_header = read_header,
.read_packet = read_packet,
.read_close = read_close,
.extensions = "brstm",
};
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