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remap: Add helper function to setup channel arrangement information

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Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
This commit is contained in:
Peter Meerwald 2014-04-16 15:06:29 +02:00 • committed by Peter Meerwald
parent 647d491653
commit 3b5868a274
2 changed files with 39 additions and 0 deletions
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29
src/pulsecore/remap.c
View file

@ -137,6 +137,35 @@ static void remap_channels_matrix_float32ne_c(pa_remap_t *m, void *dst, const vo
}
}
bool pa_setup_remap_arrange(const pa_remap_t *m, int8_t arrange[PA_CHANNELS_MAX]) {
unsigned ic, oc;
unsigned n_ic, n_oc;
pa_assert(m);
n_ic = m->i_ss.channels;
n_oc = m->o_ss.channels;
for (oc = 0; oc < n_oc; oc++) {
arrange[oc] = -1;
for (ic = 0; ic < n_ic; ic++) {
int32_t vol = m->map_table_i[oc][ic];
/* input channel is not used */
if (vol == 0)
continue;
/* if mixing this channel, we cannot just rearrange */
if (vol != 0x10000 || arrange[oc] >= 0)
return false;
arrange[oc] = ic;
}
}
return true;
}
/* set the function that will execute the remapping based on the matrices */
static void init_remap_c(pa_remap_t *m) {
unsigned n_oc, n_ic;

10
src/pulsecore/remap.h
View file

@ -45,4 +45,14 @@ typedef void (*pa_init_remap_func_t) (pa_remap_t *m);
pa_init_remap_func_t pa_get_init_remap_func(void);
void pa_set_init_remap_func(pa_init_remap_func_t func);
/* Check if remapping can be performed by just copying some or all input
* channels' data to output channels. Returns true and a table of input
* channel indices, or false otherwise.
*
* The table contains an entry for each output channels. Each table entry given
* either the input channel index to be copied, or -1 indicating that the
* output channel is not used and hence zero.
*/
bool pa_setup_remap_arrange(const pa_remap_t *m, int8_t arrange[PA_CHANNELS_MAX]);
#endif /* fooremapfoo */