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authorSascha Sommer <saschasommer@freenet.de>2009-08-26 21:18:54 +0000
committerSascha Sommer <saschasommer@freenet.de>2009-08-26 21:18:54 +0000
commitf53e96ed4170425ea70f818ea600b7a5f2a026d7 (patch)
tree2c53cd6413e4a787c53327dd5f8d8f66c483aab9
parentb97e0d7fa226a2bd3b0b99a03ce9b8703c2d18d1 (diff)
downloadffmpeg-f53e96ed4170425ea70f818ea600b7a5f2a026d7.tar.gz
merge 2-channel M/S stereo decoding code with the multichannel version
Originally committed as revision 19718 to svn://svn.ffmpeg.org/ffmpeg/trunk
-rw-r--r--libavcodec/wmaprodec.c36
1 files changed, 7 insertions, 29 deletions
diff --git a/libavcodec/wmaprodec.c b/libavcodec/wmaprodec.c
index 7deb56f981..8f48aff8ad 100644
--- a/libavcodec/wmaprodec.c
+++ b/libavcodec/wmaprodec.c
@@ -161,34 +161,7 @@ static void inverse_channel_transform(WMA3DecodeContext *s)
int i;
for (i = 0; i < s->num_chgroups; i++) {
-
- if (s->chgroup[i].transform == 1) {
- /** M/S stereo decoding */
- int16_t* sfb_offsets = s->cur_sfb_offsets;
- float* ch0 = *sfb_offsets + s->channel[0].coeffs;
- float* ch1 = *sfb_offsets++ + s->channel[1].coeffs;
- const char* tb = s->chgroup[i].transform_band;
- const char* tb_end = tb + s->num_bands;
-
- while (tb < tb_end) {
- const float* ch0_end = s->channel[0].coeffs +
- FFMIN(*sfb_offsets, s->subframe_len);
- if (*tb++ == 1) {
- while (ch0 < ch0_end) {
- const float v1 = *ch0;
- const float v2 = *ch1;
- *ch0++ = v1 - v2;
- *ch1++ = v1 + v2;
- }
- } else {
- while (ch0 < ch0_end) {
- *ch0++ *= 181.0 / 128;
- *ch1++ *= 181.0 / 128;
- }
- }
- ++sfb_offsets;
- }
- } else if (s->chgroup[i].transform) {
+ if (s->chgroup[i].transform) {
float data[WMAPRO_MAX_CHANNELS];
const int num_channels = s->chgroup[i].num_channels;
float** ch_data = s->chgroup[i].channel_data;
@@ -199,8 +172,8 @@ static void inverse_channel_transform(WMA3DecodeContext *s)
/** multichannel decorrelation */
for (sfb = s->cur_sfb_offsets;
sfb < s->cur_sfb_offsets + s->num_bands;sfb++) {
+ int y;
if (*tb++ == 1) {
- int y;
/** multiply values with the decorrelation_matrix */
for (y = sfb[0]; y < FFMIN(sfb[1], s->subframe_len); y++) {
const float* mat = s->chgroup[i].decorrelation_matrix;
@@ -220,6 +193,11 @@ static void inverse_channel_transform(WMA3DecodeContext *s)
(*ch)[y] = sum;
}
}
+ } else if (s->num_channels == 2) {
+ for (y = sfb[0]; y < FFMIN(sfb[1], s->subframe_len); y++) {
+ ch_data[0][y] *= 181.0 / 128;
+ ch_data[1][y] *= 181.0 / 128;
+ }
}
}
}