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Fix a problem when dithering mono audio. Left samples weren't being duplicated into right channel in pcm buffer.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12509 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sevakis 2007-02-27 19:14:21 +00:00
parent 92e6bcbe17
commit b5b4a16b6d
1 changed files with 18 additions and 5 deletions
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23
apps/dsp.c
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@ -476,17 +476,16 @@ static void sample_output_dithered(int count, struct dsp_data *data,
const int32_t min = data->clip_min; const int32_t min = data->clip_min;
const int32_t max = data->clip_max; const int32_t max = data->clip_max;
const int32_t range = max - min; const int32_t range = max - min;
const int dinc = dsp->data.num_channels;
int ch; int ch;
for (ch = 0; ch < dinc; ch++) int16_t *d;
for (ch = 0; ch < dsp->data.num_channels; ch++)
{ {
struct dither_data * const dither = &dither_data[ch]; struct dither_data * const dither = &dither_data[ch];
int32_t *s = src[ch]; int32_t *s = src[ch];
int16_t *d = &dst[ch];
int i; int i;
for (i = 0; i < count; i++, s++, d += dinc) for (i = 0, d = &dst[ch]; i < count; i++, s++, d += 2)
{ {
int32_t output, sample; int32_t output, sample;
int32_t random; int32_t random;
@ -530,6 +529,20 @@ static void sample_output_dithered(int count, struct dsp_data *data,
*d = output >> scale; *d = output >> scale;
} }
} }
if (dsp->data.num_channels == 2)
return;
/* Have to duplicate left samples into the right channel since
pcm buffer and hardware is interleaved stereo */
d = &dst[0];
do
{
int16_t s = *d++;
*d++ = s;
}
while (--count > 0);
} }
/** /**