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simplify 

only change context if frame header is error-free, as some fields may not be stored in the frame header and so a single damaged frame-header may trash them

Originally committed as revision 2796 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-02-18 14:05:49 +00:00
parent f8d58f4d10
commit 0496a03413
1 changed files with 41 additions and 52 deletions
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93
libavcodec/flac.c
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@ -69,6 +69,11 @@ static int sample_rate_table[] =
static int sample_size_table[] =
{ 0, 8, 12, 0, 16, 20, 24, 0 };
static int blocksize_table[] = {
0, 192, 576<<0, 576<<1, 576<<2, 576<<3, 0, 0,
256<<0, 256<<1, 256<<2, 256<<3, 256<<4, 256<<5, 256<<6, 256<<7
};
static const uint8_t table_crc8[256] = {
0x00, 0x07, 0x0e, 0x09, 0x1c, 0x1b, 0x12, 0x15,
0x38, 0x3f, 0x36, 0x31, 0x24, 0x23, 0x2a, 0x2d,
@ -168,7 +173,6 @@ static void allocate_buffers(FLACContext *s){
}
s->bitstream= av_fast_realloc(s->bitstream, &s->allocated_bitstream_size, s->max_framesize);
// s->bitstream= av_realloc(s->bitstream, s->max_framesize);
}
static void metadata_streaminfo(FLACContext *s)
@ -227,10 +231,6 @@ static int decode_residuals(FLACContext *s, int channel, int pred_order)
// av_log(s->avctx, AV_LOG_DEBUG, "rice coded partition k=%d\n", tmp);
for (; i < samples; i++, sample++){
s->decoded[channel][sample] = get_sr_golomb_flac(&s->gb, tmp, INT_MAX, 0);
if(get_bits_count(&s->gb) > s->gb.size_in_bits){
av_log(s->avctx, AV_LOG_ERROR, "fucking FLAC\n");
return -1;
}
}
}
i= 0;
@ -433,39 +433,29 @@ static inline int decode_subframe(FLACContext *s, int channel)
static int decode_frame(FLACContext *s)
{
int blocksize_code, sample_rate_code, sample_size_code, assignment, i, crc8;
int decorrelation, bps, blocksize, samplerate;
blocksize_code = get_bits(&s->gb, 4);
sample_rate_code = get_bits(&s->gb, 4);
assignment = get_bits(&s->gb, 4); /* channel assignment */
if (assignment < 8)
{
s->decorrelation = INDEPENDENT;
if (s->channels != assignment+1)
av_log(s->avctx, AV_LOG_DEBUG, "channel number and number of assigned channels differ!\n");
// av_log(s->avctx, AV_LOG_DEBUG, "channels: %d\n", assignment+1);
}
else if (assignment < 11)
{
s->decorrelation= LEFT_SIDE + assignment - 8;
}
if (assignment < 8 && s->channels == assignment+1)
decorrelation = INDEPENDENT;
else if (assignment >=8 && assignment < 11 && s->channels == 2)
decorrelation = LEFT_SIDE + assignment - 8;
else
{
av_log(s->avctx, AV_LOG_DEBUG, "unsupported channel assignment\n");
return -1;
}
if ((assignment >= 8) && (s->channels != 2))
{
av_log(s->avctx, AV_LOG_DEBUG, "unsupported channel assignment %d (channels=%d)\n", assignment, s->channels);
return -1;
}
sample_size_code = get_bits(&s->gb, 3);
if (sample_size_code != 0)
s->bps = sample_size_table[sample_size_code];
if ((sample_size_code == 3) || (sample_size_code == 7))
if(sample_size_code == 0)
bps= s->bps;
else if((sample_size_code != 3) && (sample_size_code != 7))
bps = sample_size_table[sample_size_code];
else
{
av_log(s->avctx, AV_LOG_DEBUG, "invalid sample size code (%d)\n", sample_size_code);
return -1;
@ -474,50 +464,44 @@ static int decode_frame(FLACContext *s)
if (get_bits1(&s->gb))
{
av_log(s->avctx, AV_LOG_DEBUG, "broken stream, invalid padding\n");
// return -1;
return -1;
}
if(get_utf8(&s->gb) < 0){
av_log(s->avctx, AV_LOG_ERROR, "utf8 fscked\n");
return -1;
}
#if 0
if (/*((blocksize_code == 6) || (blocksize_code == 7)) &&*/
(s->min_blocksize != s->max_blocksize)){
if(get_utf8(&s->gb) < 0){
av_log(s->avctx, AV_LOG_ERROR, "utf8 fscked\n");
return -1;
}
}else{
if(get_utf8(&s->gb) < 0){
av_log(s->avctx, AV_LOG_ERROR, "utf8 fscked\n");
return -1;
}
}
#endif
if (blocksize_code == 0)
s->blocksize = s->min_blocksize;
else if (blocksize_code == 1)
s->blocksize = 192;
else if (blocksize_code <= 5)
s->blocksize = 576 << (blocksize_code - 2);
blocksize = s->min_blocksize;
else if (blocksize_code == 6)
s->blocksize = get_bits(&s->gb, 8)+1;
blocksize = get_bits(&s->gb, 8)+1;
else if (blocksize_code == 7)
s->blocksize = get_bits(&s->gb, 16)+1;
else if (blocksize_code >= 8)
s->blocksize = 256 << (blocksize_code - 8);
blocksize = get_bits(&s->gb, 16)+1;
else
blocksize = blocksize_table[blocksize_code];
if(s->blocksize > s->max_blocksize){
av_log(s->avctx, AV_LOG_ERROR, "blocksize %d > %d\n", s->blocksize, s->max_blocksize);
if(blocksize > s->max_blocksize){
av_log(s->avctx, AV_LOG_ERROR, "blocksize %d > %d\n", blocksize, s->max_blocksize);
return -1;
}
if (sample_rate_code == 0){
//Streaminfo
samplerate= s->samplerate;
}else if ((sample_rate_code > 3) && (sample_rate_code < 12))
s->samplerate = sample_rate_table[sample_rate_code];
samplerate = sample_rate_table[sample_rate_code];
else if (sample_rate_code == 12)
s->samplerate = get_bits(&s->gb, 8) * 1000;
samplerate = get_bits(&s->gb, 8) * 1000;
else if (sample_rate_code == 13)
s->samplerate = get_bits(&s->gb, 16);
samplerate = get_bits(&s->gb, 16);
else if (sample_rate_code == 14)
s->samplerate = get_bits(&s->gb, 16) * 10;
samplerate = get_bits(&s->gb, 16) * 10;
else{
av_log(s->avctx, AV_LOG_ERROR, "illegal sample rate code %d\n", sample_rate_code);
return -1;
@ -529,6 +513,11 @@ static int decode_frame(FLACContext *s)
av_log(s->avctx, AV_LOG_ERROR, "header crc missmatch crc=%2X\n", crc8);
return -1;
}
s->blocksize = blocksize;
s->samplerate = samplerate;
s->bps = bps;
s->decorrelation= decorrelation;
// dump_headers(s);