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dmix: add S24_3LE support

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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.
This commit is contained in:
Clemens Ladisch 2005-12-19 07:39:03 +00:00
parent 46f81f994b
commit 45f63a8735
8 changed files with 404 additions and 7 deletions
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24
src/pcm/pcm_dmix_i386.c
View file

@ -5,33 +5,43 @@
#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_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;
int smp = 0, mmx = 0, cmov = 0;
/* try to determine, if we have a MMX capable CPU */
/* try to determine the capabilities of the CPU */
in = fopen("/proc/cpuinfo", "r");
if (in) {
while (!feof(in)) {
@ -41,15 +51,21 @@ static void mix_select_callbacks(snd_pcm_direct_t *dmix)
else if (!strncmp(line, "flags", 5)) {
if (strstr(line, " mmx"))
mmx = 1;
if (strstr(line, " cmov"))
cmov = 1;
}
}
fclose(in);
}
// printf("MMX: %i, SMP: %i\n", mmx, smp);
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;
}
}