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fix low bitrate mp3 

Originally committed as revision 6107 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2006-08-27 11:42:40 +00:00
parent bfe328caf0
commit c0c66dd81d
1 changed files with 17 additions and 6 deletions
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23
libavcodec/mpegaudiodec.c
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@ -2517,15 +2517,26 @@ static int mp_decode_frame(MPADecodeContext *s,
default:
nb_frames = mp_decode_layer3(s);
if(s->in_gb.buffer)
s->last_buf_size=0;
if(s->in_gb.buffer){
align_get_bits(&s->gb);
i= (s->gb.size_in_bits - get_bits_count(&s->gb))>>3;
if(i > 0 && i <= BACKSTEP_SIZE){
memmove(s->last_buf, s->gb.buffer + (get_bits_count(&s->gb)>>3), i);
s->last_buf_size=i;
}
s->gb= s->in_gb;
}
align_get_bits(&s->gb);
assert((get_bits_count(&s->gb) & 7) == 0);
s->last_buf_size= (s->gb.size_in_bits - get_bits_count(&s->gb))>>3;
if(s->last_buf_size <0 || s->last_buf_size > BACKSTEP_SIZE || nb_frames<0)
s->last_buf_size= FFMIN(BACKSTEP_SIZE, buf_size - HEADER_SIZE);
assert(s->last_buf_size <= buf_size - HEADER_SIZE);
memcpy(s->last_buf, s->gb.buffer + buf_size - HEADER_SIZE - s->last_buf_size, s->last_buf_size);
i= (s->gb.size_in_bits - get_bits_count(&s->gb))>>3;
if(i<0 || s->last_buf_size + i > BACKSTEP_SIZE || nb_frames<0)
i= FFMIN(BACKSTEP_SIZE-s->last_buf_size, buf_size - HEADER_SIZE);
assert(i <= buf_size - HEADER_SIZE && i>= 0);
memcpy(s->last_buf + s->last_buf_size, s->gb.buffer + buf_size - HEADER_SIZE - i, i);
s->last_buf_size += i;
break;
}