mirror of
https://github.com/alsa-project/alsa-lib.git
synced 2025-11-02 09:01:48 -05:00
45f63a8735
Add to the dmix plugin support for the S24_3LE sample format which is used by 24-bit USB devices. The optimized assembler version uses only 23 bits for sample data so that the lowest bit can be used for synchronization because there is no 24-bit cmpxchg instruction.
71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
/*
|
|
* optimized mixing code for i386
|
|
*/
|
|
|
|
#define MIX_AREAS1 mix_areas1
|
|
#define MIX_AREAS1_MMX mix_areas1_mmx
|
|
#define MIX_AREAS2 mix_areas2
|
|
#define MIX_AREAS3 mix_areas3
|
|
#define MIX_AREAS3_CMOV mix_areas3_cmov
|
|
#define LOCK_PREFIX ""
|
|
#include "pcm_dmix_i386.h"
|
|
#undef MIX_AREAS1
|
|
#undef MIX_AREAS1_MMX
|
|
#undef MIX_AREAS2
|
|
#undef MIX_AREAS3
|
|
#undef MIX_AREAS3_CMOV
|
|
#undef LOCK_PREFIX
|
|
|
|
#define MIX_AREAS1 mix_areas1_smp
|
|
#define MIX_AREAS1_MMX mix_areas1_smp_mmx
|
|
#define MIX_AREAS2 mix_areas2_smp
|
|
#define MIX_AREAS3 mix_areas3_smp
|
|
#define MIX_AREAS3_CMOV mix_areas3_smp_cmov
|
|
#define LOCK_PREFIX "lock ; "
|
|
#include "pcm_dmix_i386.h"
|
|
#undef MIX_AREAS1
|
|
#undef MIX_AREAS1_MMX
|
|
#undef MIX_AREAS2
|
|
#undef MIX_AREAS3
|
|
#undef MIX_AREAS3_CMOV
|
|
#undef LOCK_PREFIX
|
|
|
|
static unsigned long long dmix_supported_format =
|
|
(1ULL << SND_PCM_FORMAT_S16_LE) |
|
|
(1ULL << SND_PCM_FORMAT_S32_LE) |
|
|
(1ULL << SND_PCM_FORMAT_S24_3LE);
|
|
|
|
static void mix_select_callbacks(snd_pcm_direct_t *dmix)
|
|
{
|
|
FILE *in;
|
|
char line[255];
|
|
int smp = 0, mmx = 0, cmov = 0;
|
|
|
|
/* try to determine the capabilities of the CPU */
|
|
in = fopen("/proc/cpuinfo", "r");
|
|
if (in) {
|
|
while (!feof(in)) {
|
|
fgets(line, sizeof(line), in);
|
|
if (!strncmp(line, "processor", 9))
|
|
smp++;
|
|
else if (!strncmp(line, "flags", 5)) {
|
|
if (strstr(line, " mmx"))
|
|
mmx = 1;
|
|
if (strstr(line, " cmov"))
|
|
cmov = 1;
|
|
}
|
|
}
|
|
fclose(in);
|
|
}
|
|
if (mmx) {
|
|
dmix->u.dmix.mix_areas1 = smp > 1 ? mix_areas1_smp_mmx : mix_areas1_mmx;
|
|
} else {
|
|
dmix->u.dmix.mix_areas1 = smp > 1 ? mix_areas1_smp : mix_areas1;
|
|
}
|
|
dmix->u.dmix.mix_areas2 = smp > 1 ? mix_areas2_smp : mix_areas2;
|
|
if (cmov) {
|
|
dmix->u.dmix.mix_areas3 = smp > 1 ? mix_areas3_smp_cmov : mix_areas3_cmov;
|
|
} else {
|
|
dmix->u.dmix.mix_areas3 = smp > 1 ? mix_areas3_smp: mix_areas3;
|
|
}
|
|
}
|