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lavf/brstm: cleanup; fix short-block demuxing

tags/n2.8
Rodger Combs Paul B Mahol 10 years ago
parent
6c56827e62
commit
70a39bcf1c
1 changed files with 43 additions and 34 deletions
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  1. +43
    -34
      libavformat/brstm.c

+ 43
- 34
libavformat/brstm.c View File

@@ -30,6 +30,8 @@ typedef struct BRSTMDemuxContext {
uint32_t current_block;
uint32_t samples_per_block;
uint32_t last_block_used_bytes;
uint32_t last_block_size;
uint32_t last_block_samples;
uint8_t *table;
uint8_t *adpc;
int little_endian;
@@ -86,8 +88,8 @@ static int read_header(AVFormatContext *s)
{
BRSTMDemuxContext *b = s->priv_data;
int bom, major, minor, codec, chunk;
int64_t h1offset, pos, toffset, data_offset = 0;
uint32_t size, start, asize;
int64_t h1offset, pos, toffset;
uint32_t size, asize, start = 0;
AVStream *st;
int ret = AVERROR_EOF;
int bfstm = !strcmp("bfstm", s->iformat->name);
@@ -131,7 +133,7 @@ static int read_header(AVFormatContext *s)
section_count = read16(s);
avio_skip(s->pb, 2); // padding
for (i = 0; avio_tell(s->pb) < header_size
&& !(data_offset && info_offset)
&& !(start && info_offset)
&& i < section_count; i++) {
uint16_t flag = read16(s);
avio_skip(s->pb, 2);
@@ -145,7 +147,7 @@ static int read_header(AVFormatContext *s)
avio_skip(s->pb, 4); // seek size
break;
case 0x4002:
data_offset = read32(s);
start = read32(s) + 8;
avio_skip(s->pb, 4); //data_size = read32(s);
break;
case 0x4003:
@@ -155,11 +157,9 @@ static int read_header(AVFormatContext *s)
}
}

if (!info_offset || !data_offset)
if (!info_offset || !start)
return AVERROR_INVALIDDATA;

start = data_offset + 8;

avio_skip(s->pb, info_offset - avio_tell(s->pb));
pos = avio_tell(s->pb);
if (avio_rl32(s->pb) != MKTAG('I','N','F','O'))
@@ -223,16 +223,16 @@ static int read_header(AVFormatContext *s)
b->block_size = read32(s);
if (b->block_size > UINT32_MAX / st->codec->channels)
return AVERROR_INVALIDDATA;
b->block_size *= st->codec->channels;

b->samples_per_block = read32(s);
b->last_block_used_bytes = read32(s);
if (b->last_block_used_bytes > UINT16_MAX / st->codec->channels)
b->last_block_samples = read32(s);
b->last_block_size = read32(s);
if (b->last_block_size > UINT32_MAX / st->codec->channels)
return AVERROR_INVALIDDATA;
if (b->last_block_used_bytes > b->last_block_size)
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 || codec == AV_CODEC_ID_ADPCM_THP_LE) {
int ch;
@@ -255,15 +255,7 @@ static int read_header(AVFormatContext *s)
ret = AVERROR_INVALIDDATA;
goto fail;
}
avio_skip(s->pb, b->bfstm ? 14 : 24);
}

if (b->bfstm) {
st->codec->extradata_size = 32 * st->codec->channels;
st->codec->extradata = av_malloc(st->codec->extradata_size);
if (!st->codec->extradata)
return AVERROR(ENOMEM);
memcpy(st->codec->extradata, b->table, st->codec->extradata_size);
avio_skip(s->pb, bfstm ? 14 : 24);
}
}

@@ -283,6 +275,7 @@ static int read_header(AVFormatContext *s)
}
size -= 8;
switch (chunk) {
case MKTAG('S','E','E','K'):
case MKTAG('A','D','P','C'):
if (codec != AV_CODEC_ID_ADPCM_THP &&
codec != AV_CODEC_ID_ADPCM_THP_LE)
@@ -309,13 +302,16 @@ static int read_header(AVFormatContext *s)
case MKTAG('D','A','T','A'):
if ((start < avio_tell(s->pb)) ||
(!b->adpc && (codec == AV_CODEC_ID_ADPCM_THP ||
codec == AV_CODEC_ID_ADPCM_THP_LE)
&& !bfstm)) {
codec == AV_CODEC_ID_ADPCM_THP_LE))) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
avio_skip(s->pb, start - avio_tell(s->pb));

if (bfstm && (codec == AV_CODEC_ID_ADPCM_THP ||
codec == AV_CODEC_ID_ADPCM_THP_LE))
avio_skip(s->pb, 24);

if ((major != 1 || minor) && !bfstm)
avpriv_request_sample(s, "Version %d.%d", major, minor);

@@ -337,15 +333,16 @@ 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;
uint32_t samples, size, skip = 0;
int ret, i;

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;
samples = b->last_block_samples;
skip = b->last_block_size - b->last_block_used_bytes;
} else if (b->current_block < b->block_count) {
size = b->block_size;
samples = b->samples_per_block;
@@ -353,24 +350,36 @@ static int read_packet(AVFormatContext *s, AVPacket *pkt)
return AVERROR_EOF;
}

if ((codec->codec_id == AV_CODEC_ID_ADPCM_THP ||
codec->codec_id == AV_CODEC_ID_ADPCM_THP_LE) && !codec->extradata) {
if (codec->codec_id == AV_CODEC_ID_ADPCM_THP ||
codec->codec_id == AV_CODEC_ID_ADPCM_THP_LE) {
uint8_t *dst;

if (av_new_packet(pkt, 8 + (32 + 4) * codec->channels + size) < 0)
if (av_new_packet(pkt, 8 + (32 + 4 + size) * codec->channels) < 0)
return AVERROR(ENOMEM);
dst = pkt->data;
bytestream_put_be32(&dst, size);
bytestream_put_be32(&dst, samples);
if (codec->codec_id == AV_CODEC_ID_ADPCM_THP_LE) {
bytestream_put_le32(&dst, size * codec->channels);
bytestream_put_le32(&dst, samples);
} else {
bytestream_put_be32(&dst, size * codec->channels);
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);
for (i = 0; i < codec->channels; i++) {
ret = avio_read(s->pb, dst, size);
dst += size;
avio_skip(s->pb, skip);
if (ret != size) {
av_free_packet(pkt);
break;
}
}
pkt->duration = samples;
} else {
size *= codec->channels;
ret = av_get_packet(s->pb, pkt, size);
}



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