[FFmpeg-cvslog] Perform dequantization of channel coefficients
Mashiat Sarker Shakkhar
git at videolan.org
Sat Dec 24 02:03:03 CET 2011
ffmpeg | branch: master | Mashiat Sarker Shakkhar <shahriman_ams at yahoo.com> | Fri Dec 23 13:21:33 2011 +0600| [70dd5a603cb9d1e7ba00640afa2da52ce5fabf3e] | committer: Mashiat Sarker Shakkhar
Perform dequantization of channel coefficients
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=70dd5a603cb9d1e7ba00640afa2da52ce5fabf3e
---
libavcodec/wmalosslessdec.c | 9 +++++++--
1 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/libavcodec/wmalosslessdec.c b/libavcodec/wmalosslessdec.c
index 67aa655..e520ad3 100644
--- a/libavcodec/wmalosslessdec.c
+++ b/libavcodec/wmalosslessdec.c
@@ -1052,10 +1052,11 @@ static int decode_subframe(WmallDecodeCtx *s)
{
int offset = s->samples_per_frame;
int subframe_len = s->samples_per_frame;
- int i;
+ int i, j;
int total_samples = s->samples_per_frame * s->num_channels;
int rawpcm_tile;
int padding_zeroes;
+ int quant_stepsize = s->quant_stepsize;
s->subframe_offset = get_bits_count(&s->gb);
@@ -1155,7 +1156,6 @@ static int decode_subframe(WmallDecodeCtx *s)
if(rawpcm_tile) {
int bits = s->bits_per_sample - padding_zeroes;
- int j;
dprintf(s->avctx, "RAWPCM %d bits per sample. total %d bits, remain=%d\n", bits,
bits * s->num_channels * subframe_len, get_bits_count(&s->gb));
for(i = 0; i < s->num_channels; i++) {
@@ -1182,6 +1182,11 @@ static int decode_subframe(WmallDecodeCtx *s)
if(s->do_ac_filter)
revert_acfilter(s, subframe_len);
+ /* Dequantize */
+ for (i = 0; i < s->num_channels; i++)
+ for (j = 0; j < subframe_len; j++)
+ s->channel_residues[i][j] *= quant_stepsize;
+
/** handled one subframe */
for (i = 0; i < s->channels_for_cur_subframe; i++) {
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