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Code Issues Releases Activity

Don't use get_vlc2() when tree is one symbol. This fixes audio decoding

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artifacts (chirps instead of silence).

Originally committed as revision 5217 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov 2006-03-25 15:37:08 +00:00
parent 662710ed35
commit 76fabb4579
1 changed files with 43 additions and 12 deletions
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55
libavcodec/smacker.c
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@ -606,44 +606,75 @@ static int smka_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
get_bits1(&gb);
smacker_decode_tree(&gb, &h[i], 0, 0);
get_bits1(&gb);
res = init_vlc(&vlc[i], SMKTREE_BITS, h[i].length,
if(h[i].current > 1) {
res = init_vlc(&vlc[i], SMKTREE_BITS, h[i].length,
h[i].lengths, sizeof(int), sizeof(int),
h[i].bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
if(res < 0) {
av_log(avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
return -1;
if(res < 0) {
av_log(avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
return -1;
}
}
}
if(bits) { //decode 16-bit data
pred[0] = get_bits(&gb, 8);
pred[0] |= get_bits(&gb, 8);
*samples++ = pred[0];
if(stereo) {
pred[1] = get_bits(&gb, 8);
pred[1] |= get_bits(&gb, 8);
*samples++ = pred[1];
}
for(i = 0; i < unp_size / 2; i++) {
if(i & stereo) {
val = h[2].values[get_vlc2(&gb, vlc[2].table, SMKTREE_BITS, 3)];
val |= (int8_t)h[3].values[get_vlc2(&gb, vlc[3].table, SMKTREE_BITS, 3)] << 8;
pred[1] += val;
if(vlc[2].table)
res = get_vlc2(&gb, vlc[2].table, SMKTREE_BITS, 3);
else
res = 0;
val = h[2].values[res];
if(vlc[3].table)
res = get_vlc2(&gb, vlc[3].table, SMKTREE_BITS, 3);
else
res = 0;
val |= h[3].values[res] << 8;
pred[1] += (int16_t)val;
*samples++ = pred[1];
} else {
val = h[0].values[get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3)];
val |= (int8_t)h[1].values[get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3)] << 8;
if(vlc[0].table)
res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
else
res = 0;
val = h[0].values[res];
if(vlc[1].table)
res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);
else
res = 0;
val |= h[1].values[res] << 8;
pred[0] += val;
*samples++ = pred[0];
}
}
} else { //8-bit data
pred[0] = get_bits(&gb, 8);
if(stereo)
*samples++ = (pred[0] - 0x80) << 8;
if(stereo) {
pred[1] = get_bits(&gb, 8);
*samples++ = (pred[1] - 0x80) << 8;
}
for(i = 0; i < unp_size; i++) {
if(i & stereo){
pred[1] += (int8_t)h[1].values[get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3)];
if(vlc[1].table)
res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);
else
res = 0;
pred[1] += (int8_t)h[1].values[res];
*samples++ = (pred[1] - 0x80) << 8;
} else {
pred[0] += (int8_t)h[0].values[get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3)];
if(vlc[0].table)
res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
else
res = 0;
pred[0] += (int8_t)h[0].values[res];
*samples++ = (pred[0] - 0x80) << 8;
}
}