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Implement revert_cdlms()

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This commit is contained in:
Mashiat Sarker Shakkhar
2011-11-12 16:07:12 +06:00
parent d47782df26
commit caf9eb85b1
1 changed files with 33 additions and 0 deletions
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33
libavcodec/wmalosslessdec.c
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@ -873,6 +873,39 @@ static void use_normal_update_speed(WmallDecodeCtx *s, int ich)
} }
} }
static void revert_cdlms(WmallDecodeCtx *s, int tile_size)
{
int icoef, ich;
int32_t pred, channel_coeff;
int ilms, num_lms;
for (ich = 0; ich < s->num_channels; ich++) {
if (!s->is_channel_coded[ich])
continue;
for (icoef = 0; icoef < tile_size; icoef++) {
num_lms = s->cdlms_ttl[ich];
channel_coeff = s->channel_residues[ich][icoef];
if (icoef == s->transient_pos[ich]) {
s->transient[ich] = 1;
use_high_update_speed(s, ich);
}
for (ilms = num_lms; ilms >= 0; ilms--) {
pred = lms_predict(s, ich, ilms);
channel_coeff += pred;
lms_update(s, ich, ilms, channel_coeff, pred);
}
if (s->transient[ich]) {
--s->channel[ich].transient_counter;
if(!s->channel[ich].transient_counter)
use_normal_update_speed(s, ich);
}
s->channel_coeffs[ich][icoef] = channel_coeff;
}
}
}
/** /**
*@brief Decode a single subframe (block). *@brief Decode a single subframe (block).
*@param s codec context *@param s codec context