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Fix not coded channels / silence decoding. 

Fixes issue264 WMV audio stutter

Originally committed as revision 14171 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2008-07-11 19:51:36 +00:00
parent 362aba4be7
commit 7ee18c1781
1 changed files with 8 additions and 5 deletions
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13
libavcodec/wmadec.c
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@ -401,13 +401,14 @@ static int wma_decode_block(WMACodecContext *s)
s->channel_coded[ch] = a;
v |= a;
}
bsize = s->frame_len_bits - s->block_len_bits;
/* if no channel coded, no need to go further */
/* XXX: fix potential framing problems */
if (!v)
goto next;
bsize = s->frame_len_bits - s->block_len_bits;
/* read total gain and extract corresponding number of bits for
coef escape coding */
total_gain = 1;
@ -679,14 +680,17 @@ static int wma_decode_block(WMACodecContext *s)
}
}
next:
for(ch = 0; ch < s->nb_channels; ch++) {
if (s->channel_coded[ch]) {
int n4, index, n;
n = s->block_len;
n4 = s->block_len / 2;
if(s->channel_coded[ch]){
s->mdct_ctx[bsize].fft.imdct_calc(&s->mdct_ctx[bsize],
s->output, s->coefs[ch], s->mdct_tmp);
}else
memset(s->output, 0, sizeof(s->output));
/* multiply by the window and add in the frame */
index = (s->frame_len / 2) + s->block_pos - n4;
@ -697,9 +701,8 @@ static int wma_decode_block(WMACodecContext *s)
if (s->ms_stereo && !s->channel_coded[1]) {
wma_window(s, &s->frame_out[1][index]);
}
}
}
next:
/* update block number */
s->block_num++;
s->block_pos += s->block_len;