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Code Issues Releases Activity

Fix inverse-MCLMS filtering routines

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This commit is contained in:
Mashiat Sarker Shakkhar 2011-12-22 23:48:02 +06:00
parent 4fa3f1c507
commit 302d5df834
1 changed files with 31 additions and 27 deletions
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56
libavcodec/wmalosslessdec.c
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@ -787,36 +787,35 @@ static void reset_codec(WmallDecodeCtx *s)
static void mclms_update(WmallDecodeCtx *s, int icoef)
static void mclms_update(WmallDecodeCtx *s, int icoef, int *pred)
{
int i, j, ich;
int16_t pred_error;
int pred_error;
int order = s->mclms_order;
int num_channels = s->num_channels;
int16_t range = 1 << (s->bits_per_sample - 1);
int range = 1 << (s->bits_per_sample - 1);
int bps = s->bits_per_sample > 16 ? 4 : 2; // bytes per sample
for (ich = 0; ich < num_channels; ich++) {
pred_error = s->channel_coeffs[ich][icoef] -
s->channel_residues[ich][icoef];
pred_error = s->channel_residues[ich][icoef] - pred[ich];
if (pred_error > 0) {
for (i = 0; i < order * num_channels; i++)
s->mclms_coeffs[i + ich * order * num_channels] +=
s->mclms_updates[s->mclms_recent + i];
for (j = 0; j < i; j++) {
if (s->channel_coeffs[ich][icoef] > 0)
for (j = 0; j < ich; j++) {
if (s->channel_residues[j][icoef] > 0)
s->mclms_coeffs_cur[ich * num_channels + j] += 1;
else if (s->channel_coeffs[ich][icoef] < 0)
else if (s->channel_residues[j][icoef] < 0)
s->mclms_coeffs_cur[ich * num_channels + j] -= 1;
}
} else if (pred_error < 0) {
for (i = 0; i < order * num_channels; i++)
s->mclms_coeffs[i + ich * order * num_channels] -=
s->mclms_updates[s->mclms_recent + i];
for (j = 0; j < i; j++) {
if (s->channel_coeffs[ich][icoef] > 0)
for (j = 0; j < ich; j++) {
if (s->channel_residues[j][icoef] > 0)
s->mclms_coeffs_cur[ich * num_channels + j] -= 1;
else if (s->channel_coeffs[ich][icoef] < 0)
else if (s->channel_residues[j][icoef] < 0)
s->mclms_coeffs_cur[ich * num_channels + j] += 1;
}
}
@ -824,13 +823,17 @@ static void mclms_update(WmallDecodeCtx *s, int icoef)
for (ich = num_channels - 1; ich >= 0; ich--) {
s->mclms_recent--;
if (s->channel_coeffs[ich][icoef] > range - 1)
s->mclms_prevvalues[s->mclms_recent] = s->channel_residues[ich][icoef];
if (s->channel_residues[ich][icoef] > range - 1)
s->mclms_prevvalues[s->mclms_recent] = range - 1;
else if (s->channel_coeffs[ich][icoef] <= -range)
else if (s->channel_residues[ich][icoef] < -range)
s->mclms_prevvalues[s->mclms_recent] = -range;
s->mclms_updates[s->mclms_recent] =
av_clip(-1, s->channel_coeffs[ich][icoef], 1);
s->mclms_updates[s->mclms_recent] = 0;
if (s->channel_residues[ich][icoef] > 0)
s->mclms_updates[s->mclms_recent] = 1;
else if (s->channel_residues[ich][icoef] < 0)
s->mclms_updates[s->mclms_recent] = -1;
}
if (s->mclms_recent == 0) {
@ -843,34 +846,35 @@ static void mclms_update(WmallDecodeCtx *s, int icoef)
s->mclms_recent = num_channels * order;
}
}
static void mclms_predict(WmallDecodeCtx *s, int icoef)
static void mclms_predict(WmallDecodeCtx *s, int icoef, int *pred)
{
int ich, i;
int16_t pred;
int order = s->mclms_order;
int num_channels = s->num_channels;
for (ich = 0; ich < num_channels; ich++) {
if (!s->is_channel_coded[ich])
continue;
pred = 0;
pred[ich] = 0;
for (i = 0; i < order * num_channels; i++)
pred += s->mclms_prevvalues[i] *
pred[ich] += s->mclms_prevvalues[i + s->mclms_recent] *
s->mclms_coeffs[i + order * num_channels * ich];
for (i = 0; i < ich; i++)
pred += s->channel_coeffs[ich][icoef] *
s->mclms_coeffs_cur[i + order * num_channels * ich];
s->channel_coeffs[ich][icoef] =
s->channel_residues[ich][icoef] + pred;
pred[ich] += s->channel_residues[i][icoef] *
s->mclms_coeffs_cur[i + num_channels * ich];
pred[ich] += 1 << s->mclms_scaling - 1;
pred[ich] >>= s->mclms_scaling;
s->channel_residues[ich][icoef] += pred[ich];
}
}
static void revert_mclms(WmallDecodeCtx *s, int tile_size)
{
int icoef;
int icoef, pred[s->num_channels];
for (icoef = 0; icoef < tile_size; icoef++) {
mclms_predict(s, icoef);
mclms_update(s, icoef);
mclms_predict(s, icoef, pred);
mclms_update(s, icoef, pred);
}
}