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mux multi-channel audio files to mono to support playing stereo sound files

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git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@11226 d0543943-73ff-0310-b7d9-9358b9ac24b2
This commit is contained in:
Anthony Minessale
2009-01-15 17:47:21 +00:00
parent b47337b660
commit 51aea0ea08
3 changed files with 36 additions and 1 deletions
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21
src/switch_resample.c
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@@ -244,6 +244,27 @@ SWITCH_DECLARE(uint32_t) switch_merge_sln(int16_t *data, uint32_t samples, int16
return x;
}
SWITCH_DECLARE(void) switch_mux_channels(int16_t *data, uint32_t samples, uint32_t channels)
{
int16_t *buf;
switch_size_t len = samples * sizeof(int16_t);
uint32_t i = 0, j = 0, k = 0;
switch_zmalloc(buf, len);
for(i = 0; i < samples; i++) {
for (j = 0; j < channels; j++) {
int32_t z = buf[i] + data[k++];
switch_normalize_to_16bit(z);
buf[i] = (int16_t) z;
}
}
memcpy(data, buf, len);
free(buf);
}
SWITCH_DECLARE(void) switch_change_sln_volume(int16_t *data, uint32_t samples, int32_t vol)
{
double newrate = 0;