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support for dynamic 2.0/5.1 AC3 changes - bug#3441

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This commit is contained in:
Jaroslav Kysela 2008-01-15 14:47:26 +01:00
parent d6d0775e8c
commit 93de415cfe
1 changed files with 26 additions and 4 deletions
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28
ac3dec/libac3/downmix.c
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@ -252,6 +252,22 @@ downmix_3f_0r_to_2ch(bsi_t* bsi, stream_samples_t samples,sint_16 *s16_samples)
}
}
static void
downmix_2f_0r_to_6ch(bsi_t* bsi, stream_samples_t samples,sint_16 *s16_samples)
{
uint_32 j;
float *left = 0, *right = 0;
left = samples[0];
right = samples[1];
for (j = 0; j < 256; j++)
{
s16_samples[j * 6 ] = (sint_16) (*left++ * 32767.0f);
s16_samples[j * 6 + 1] = (sint_16) (*right++ * 32767.0f);
} //FIXME enable output on surround channels, too.
}
static void
downmix_2f_0r_to_2ch(bsi_t* bsi, stream_samples_t samples,sint_16 *s16_samples)
{
@ -368,13 +384,19 @@ void downmix(bsi_t* bsi, stream_samples_t samples,sint_16 *s16_samples)
downmix_3f_0r_to_2ch(bsi,samples,s16_samples);
break;
// 2/0
// 2/0 - 2f_0r_to_6ch not really, but allows -D pcm.surround51:1 with 2/0 and 3/2 input (VDR e.g.)
case 2:
if (ac3_config.num_output_ch != 2) {
switch (ac3_config.num_output_ch) {
case 2:
downmix_2f_0r_to_2ch(bsi,samples,s16_samples);
break;
case 6:
downmix_2f_0r_to_6ch(bsi,samples,s16_samples);
break;
default:
fprintf(stderr,"unsupported 2/0 channels %d\n", ac3_config.num_output_ch);
exit(1);
}
downmix_2f_0r_to_2ch(bsi,samples,s16_samples);
break;
// 1/0