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Add support of little-endian on i386/x86_64 dmix

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i386/x86_64 alsa-lib may need to handle big-endian formats, e.g.
when running via qemu on PPC.  The generic dmix code already has
both endian support, so let's use it as fallback.
This commit is contained in:
Takashi Iwai 2007-07-03 19:52:33 +02:00
parent f49e5859fd
commit 267d7c7281
4 changed files with 79 additions and 54 deletions
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58
src/pcm/pcm_dmix_i386.c
View file

@ -30,33 +30,45 @@
#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);
#define i386_dmix_supported_format \
((1ULL << SND_PCM_FORMAT_S16_LE) |\
(1ULL << SND_PCM_FORMAT_S32_LE) |\
(1ULL << SND_PCM_FORMAT_S24_3LE))
#define dmix_supported_format \
(i386_dmix_supported_format | generic_dmix_supported_format)
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);
static int smp = 0, mmx = 0, cmov = 0;
if (!((1ULL<< dmix->shmptr->s.format) & i386_dmix_supported_format)) {
generic_mix_select_callbacks(dmix);
return;
}
if (!smp) {
FILE *in;
char line[255];
/* 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 {