mirrors/alsa-lib
1
0
Fork 0
mirror of https://github.com/alsa-project/alsa-lib.git synced 2025-10-29 05:40:25 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

dmix: simplify mix_areas()

Browse source 
The code for the three supported sample widths is almost the same, so it
makes sense to merge the three cases.
This commit is contained in:
Clemens Ladisch 2007-12-10 12:32:36 +01:00
parent 79db4a6bfa
commit a3fe1f7800
2 changed files with 52 additions and 86 deletions
Download patch file Download diff file Expand all files Collapse all files

5
src/pcm/pcm_direct.h
View file

@ -24,6 +24,11 @@
#define DIRECT_IPC_SEMS 1
#define DIRECT_IPC_SEM_CLIENT 0
typedef void (mix_areas_t)(unsigned int size,
volatile void *dst, void *src,
volatile signed int *sum, size_t dst_step,
size_t src_step, size_t sum_step);
typedef void (mix_areas_16_t)(unsigned int size,
volatile signed short *dst, signed short *src,
volatile signed int *sum, size_t dst_step,

133
src/pcm/pcm_dmix.c
View file

@ -156,95 +156,56 @@ static void mix_areas(snd_pcm_direct_t *dmix,
snd_pcm_uframes_t dst_ofs,
snd_pcm_uframes_t size)
{
volatile signed int *sum;
unsigned int src_step, dst_step;
unsigned int chn, dchn, channels;
unsigned int chn, dchn, channels, sample_size;
mix_areas_t *do_mix_areas;
channels = dmix->channels;
if (dmix->shmptr->s.format == SND_PCM_FORMAT_S16_LE ||
dmix->shmptr->s.format == SND_PCM_FORMAT_S16_BE) {
signed short *src;
volatile signed short *dst;
if (dmix->interleaved) {
/*
* process all areas in one loop
* it optimizes the memory accesses for this case
*/
dmix->u.dmix.mix_areas_16(size * channels,
((signed short *)dst_areas[0].addr) + (dst_ofs * channels),
((signed short *)src_areas[0].addr) + (src_ofs * channels),
dmix->u.dmix.sum_buffer + (dst_ofs * channels),
sizeof(signed short),
sizeof(signed short),
sizeof(signed int));
return;
}
for (chn = 0; chn < channels; chn++) {
dchn = dmix->bindings ? dmix->bindings[chn] : chn;
if (dchn >= dmix->shmptr->s.channels)
continue;
src_step = src_areas[chn].step / 8;
dst_step = dst_areas[dchn].step / 8;
src = (signed short *)(((char *)src_areas[chn].addr + src_areas[chn].first / 8) + (src_ofs * src_step));
dst = (signed short *)(((char *)dst_areas[dchn].addr + dst_areas[dchn].first / 8) + (dst_ofs * dst_step));
sum = dmix->u.dmix.sum_buffer + channels * dst_ofs + chn;
dmix->u.dmix.mix_areas_16(size, dst, src, sum, dst_step, src_step, channels * sizeof(signed int));
}
} else if (dmix->shmptr->s.format == SND_PCM_FORMAT_S32_LE ||
dmix->shmptr->s.format == SND_PCM_FORMAT_S32_BE) {
signed int *src;
volatile signed int *dst;
if (dmix->interleaved) {
/*
* process all areas in one loop
* it optimizes the memory accesses for this case
*/
dmix->u.dmix.mix_areas_32(size * channels,
((signed int *)dst_areas[0].addr) + (dst_ofs * channels),
((signed int *)src_areas[0].addr) + (src_ofs * channels),
dmix->u.dmix.sum_buffer + (dst_ofs * channels),
sizeof(signed int),
sizeof(signed int),
sizeof(signed int));
return;
}
for (chn = 0; chn < channels; chn++) {
dchn = dmix->bindings ? dmix->bindings[chn] : chn;
if (dchn >= dmix->shmptr->s.channels)
continue;
src_step = src_areas[chn].step / 8;
dst_step = dst_areas[dchn].step / 8;
src = (signed int *)(((char *)src_areas[chn].addr + src_areas[chn].first / 8) + (src_ofs * src_step));
dst = (signed int *)(((char *)dst_areas[dchn].addr + dst_areas[dchn].first / 8) + (dst_ofs * dst_step));
sum = dmix->u.dmix.sum_buffer + channels * dst_ofs + chn;
dmix->u.dmix.mix_areas_32(size, dst, src, sum, dst_step, src_step, channels * sizeof(signed int));
}
} else { /* SND_PCM_FORMAT_S24_3LE */
unsigned char *src;
volatile unsigned char *dst;
if (dmix->interleaved) {
/*
* process all areas in one loop
* it optimizes the memory accesses for this case
*/
dmix->u.dmix.mix_areas_24(size * channels,
((unsigned char *)dst_areas[0].addr) + 3 * dst_ofs * channels,
((unsigned char *)src_areas[0].addr) + 3 * src_ofs * channels,
dmix->u.dmix.sum_buffer + (dst_ofs * channels),
3, 3, sizeof(signed int));
return;
}
for (chn = 0; chn < channels; chn++) {
dchn = dmix->bindings ? dmix->bindings[chn] : chn;
if (dchn >= dmix->shmptr->s.channels)
continue;
src_step = src_areas[chn].step / 8;
dst_step = dst_areas[dchn].step / 8;
src = (unsigned char *)(((char *)src_areas[chn].addr + src_areas[chn].first / 8) + (src_ofs * src_step));
dst = (unsigned char *)(((char *)dst_areas[dchn].addr + dst_areas[dchn].first / 8) + (dst_ofs * dst_step));
sum = dmix->u.dmix.sum_buffer + channels * dst_ofs + chn;
dmix->u.dmix.mix_areas_24(size, dst, src, sum, dst_step, src_step, channels * sizeof(signed int));
}
switch (dmix->shmptr->s.format) {
case SND_PCM_FORMAT_S16_LE:
case SND_PCM_FORMAT_S16_BE:
sample_size = 2;
do_mix_areas = (mix_areas_t *)dmix->u.dmix.mix_areas_16;
break;
case SND_PCM_FORMAT_S32_LE:
case SND_PCM_FORMAT_S32_BE:
sample_size = 4;
do_mix_areas = (mix_areas_t *)dmix->u.dmix.mix_areas_32;
break;
case SND_PCM_FORMAT_S24_3LE:
sample_size = 3;
do_mix_areas = (mix_areas_t *)dmix->u.dmix.mix_areas_24;
break;
default:
return;
}
if (dmix->interleaved) {
/*
* process all areas in one loop
* it optimizes the memory accesses for this case
*/
do_mix_areas(size * channels,
(unsigned char *)dst_areas[0].addr + sample_size * dst_ofs * channels,
(unsigned char *)src_areas[0].addr + sample_size * src_ofs * channels,
dmix->u.dmix.sum_buffer + dst_ofs * channels,
sample_size,
sample_size,
sizeof(signed int));
return;
}
for (chn = 0; chn < channels; chn++) {
dchn = dmix->bindings ? dmix->bindings[chn] : chn;
if (dchn >= dmix->shmptr->s.channels)
continue;
src_step = src_areas[chn].step / 8;
dst_step = dst_areas[dchn].step / 8;
do_mix_areas(size,
((unsigned char *)dst_areas[dchn].addr + dst_areas[dchn].first / 8) + dst_ofs * dst_step,
((unsigned char *)src_areas[chn].addr + src_areas[chn].first / 8) + src_ofs * src_step,
dmix->u.dmix.sum_buffer + channels * dst_ofs + chn,
dst_step,
src_step,
channels * sizeof(signed int));
}
}