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alsa: clean up macro salsa a little.

This commit is contained in:
Ryan C. Gordon 2021-09-21 11:13:46 -04:00
parent f5e636a621
commit c45facf2ca
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GPG Key ID: FA148B892AB48044
1 changed files with 14 additions and 31 deletions
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45
src/audio/alsa/SDL_alsa_audio.c
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@ -274,42 +274,25 @@ ALSA_WaitDevice(_THIS)
/* !!! FIXME: is there a channel swizzler in alsalib instead? */
/*
* http://bugzilla.libsdl.org/show_bug.cgi?id=110
* https://bugzilla.libsdl.org/show_bug.cgi?id=110
* "For Linux ALSA, this is FL-FR-RL-RR-C-LFE
* and for Windows DirectX [and CoreAudio], this is FL-FR-C-LFE-RL-RR"
*/
#define SWIZ6(T, buf, numframes) \
T *ptr = (T *) buf; \
#define SWIZ6(T) \
static void swizzle_alsa_channels_6_##T(void *buffer, const Uint32 bufferlen) { \
T *ptr = (T *) buffer; \
Uint32 i; \
for (i = 0; i < numframes; i++, ptr += 6) { \
for (i = 0; i < bufferlen; i++, ptr += 6) { \
T tmp; \
tmp = ptr[2]; ptr[2] = ptr[4]; ptr[4] = tmp; \
tmp = ptr[3]; ptr[3] = ptr[5]; ptr[5] = tmp; \
} \
}
static void
swizzle_alsa_channels_6_64bit(void *buffer, Uint32 bufferlen)
{
SWIZ6(Uint64, buffer, bufferlen);
}
static void
swizzle_alsa_channels_6_32bit(void *buffer, Uint32 bufferlen)
{
SWIZ6(Uint32, buffer, bufferlen);
}
static void
swizzle_alsa_channels_6_16bit(void *buffer, Uint32 bufferlen)
{
SWIZ6(Uint16, buffer, bufferlen);
}
static void
swizzle_alsa_channels_6_8bit(void *buffer, Uint32 bufferlen)
{
SWIZ6(Uint8, buffer, bufferlen);
}
SWIZ6(Uint64)
SWIZ6(Uint32)
SWIZ6(Uint16)
SWIZ6(Uint8)
#undef SWIZ6
@ -323,10 +306,10 @@ swizzle_alsa_channels(_THIS, void *buffer, Uint32 bufferlen)
{
if (this->spec.channels == 6) {
switch (SDL_AUDIO_BITSIZE(this->spec.format)) {
case 8: swizzle_alsa_channels_6_8bit(buffer, bufferlen); break;
case 16: swizzle_alsa_channels_6_16bit(buffer, bufferlen); break;
case 32: swizzle_alsa_channels_6_32bit(buffer, bufferlen); break;
case 64: swizzle_alsa_channels_6_64bit(buffer, bufferlen); break;
case 8: swizzle_alsa_channels_6_Uint8(buffer, bufferlen); break;
case 16: swizzle_alsa_channels_6_Uint16(buffer, bufferlen); break;
case 32: swizzle_alsa_channels_6_Uint32(buffer, bufferlen); break;
case 64: swizzle_alsa_channels_6_Uint64(buffer, bufferlen); break;
default: SDL_assert(!"unhandled bitsize"); break;
}
}