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cleanup of SDL_MixAudioFormat

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pionere 2022-01-08 12:15:53 +01:00 committed by Ryan C. Gordon
parent d7110b4490
commit 905e2e22ef
1 changed files with 27 additions and 36 deletions
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63
src/audio/SDL_mixer.c
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@ -115,8 +115,8 @@ SDL_MixAudioFormat(Uint8 * dst, const Uint8 * src, SDL_AudioFormat format,
Sint8 *dst8, *src8; Sint8 *dst8, *src8;
Sint8 src_sample; Sint8 src_sample;
int dst_sample; int dst_sample;
const int max_audioval = ((1 << (8 - 1)) - 1); const int max_audioval = SDL_MAX_SINT8;
const int min_audioval = -(1 << (8 - 1)); const int min_audioval = SDL_MIN_SINT8;
src8 = (Sint8 *) src; src8 = (Sint8 *) src;
dst8 = (Sint8 *) dst; dst8 = (Sint8 *) dst;
@ -125,12 +125,11 @@ SDL_MixAudioFormat(Uint8 * dst, const Uint8 * src, SDL_AudioFormat format,
ADJUST_VOLUME(src_sample, volume); ADJUST_VOLUME(src_sample, volume);
dst_sample = *dst8 + src_sample; dst_sample = *dst8 + src_sample;
if (dst_sample > max_audioval) { if (dst_sample > max_audioval) {
*dst8 = max_audioval; dst_sample = max_audioval;
} else if (dst_sample < min_audioval) { } else if (dst_sample < min_audioval) {
*dst8 = min_audioval; dst_sample = min_audioval;
} else {
*dst8 = dst_sample;
} }
*dst8 = dst_sample;
++dst8; ++dst8;
++src8; ++src8;
} }
@ -141,14 +140,14 @@ SDL_MixAudioFormat(Uint8 * dst, const Uint8 * src, SDL_AudioFormat format,
{ {
Sint16 src1, src2; Sint16 src1, src2;
int dst_sample; int dst_sample;
const int max_audioval = ((1 << (16 - 1)) - 1); const int max_audioval = SDL_MAX_SINT16;
const int min_audioval = -(1 << (16 - 1)); const int min_audioval = SDL_MIN_SINT16;
len /= 2; len /= 2;
while (len--) { while (len--) {
src1 = ((src[1]) << 8 | src[0]); src1 = SDL_SwapLE16(*(Sint16 *)src);
ADJUST_VOLUME(src1, volume); ADJUST_VOLUME(src1, volume);
src2 = ((dst[1]) << 8 | dst[0]); src2 = SDL_SwapLE16(*(Sint16 *)dst);
src += 2; src += 2;
dst_sample = src1 + src2; dst_sample = src1 + src2;
if (dst_sample > max_audioval) { if (dst_sample > max_audioval) {
@ -156,9 +155,7 @@ SDL_MixAudioFormat(Uint8 * dst, const Uint8 * src, SDL_AudioFormat format,
} else if (dst_sample < min_audioval) { } else if (dst_sample < min_audioval) {
dst_sample = min_audioval; dst_sample = min_audioval;
} }
dst[0] = dst_sample & 0xFF; *(Sint16 *)dst = SDL_SwapLE16(dst_sample);
dst_sample >>= 8;
dst[1] = dst_sample & 0xFF;
dst += 2; dst += 2;
} }
} }
@ -168,14 +165,14 @@ SDL_MixAudioFormat(Uint8 * dst, const Uint8 * src, SDL_AudioFormat format,
{ {
Sint16 src1, src2; Sint16 src1, src2;
int dst_sample; int dst_sample;
const int max_audioval = ((1 << (16 - 1)) - 1); const int max_audioval = SDL_MAX_SINT16;
const int min_audioval = -(1 << (16 - 1)); const int min_audioval = SDL_MIN_SINT16;
len /= 2; len /= 2;
while (len--) { while (len--) {
src1 = ((src[0]) << 8 | src[1]); src1 = SDL_SwapBE16(*(Sint16 *)src);
ADJUST_VOLUME(src1, volume); ADJUST_VOLUME(src1, volume);
src2 = ((dst[0]) << 8 | dst[1]); src2 = SDL_SwapBE16(*(Sint16 *)dst);
src += 2; src += 2;
dst_sample = src1 + src2; dst_sample = src1 + src2;
if (dst_sample > max_audioval) { if (dst_sample > max_audioval) {
@ -183,9 +180,7 @@ SDL_MixAudioFormat(Uint8 * dst, const Uint8 * src, SDL_AudioFormat format,
} else if (dst_sample < min_audioval) { } else if (dst_sample < min_audioval) {
dst_sample = min_audioval; dst_sample = min_audioval;
} }
dst[1] = dst_sample & 0xFF; *(Sint16 *)dst = SDL_SwapBE16(dst_sample);
dst_sample >>= 8;
dst[0] = dst_sample & 0xFF;
dst += 2; dst += 2;
} }
} }
@ -195,21 +190,19 @@ SDL_MixAudioFormat(Uint8 * dst, const Uint8 * src, SDL_AudioFormat format,
{ {
Uint16 src1, src2; Uint16 src1, src2;
int dst_sample; int dst_sample;
const int max_audioval = 0xFFFF; const int max_audioval = SDL_MAX_UINT16;
len /= 2; len /= 2;
while (len--) { while (len--) {
src1 = ((src[1]) << 8 | src[0]); src1 = SDL_SwapLE16(*(Uint16 *)src);
ADJUST_VOLUME(src1, volume); ADJUST_VOLUME(src1, volume);
src2 = ((dst[1]) << 8 | dst[0]); src2 = SDL_SwapLE16(*(Uint16 *)dst);
src += 2; src += 2;
dst_sample = src1 + src2; dst_sample = src1 + src2;
if (dst_sample > max_audioval) { if (dst_sample > max_audioval) {
dst_sample = max_audioval; dst_sample = max_audioval;
} }
dst[0] = dst_sample & 0xFF; *(Uint16 *)dst = SDL_SwapLE16(dst_sample);
dst_sample >>= 8;
dst[1] = dst_sample & 0xFF;
dst += 2; dst += 2;
} }
} }
@ -219,21 +212,19 @@ SDL_MixAudioFormat(Uint8 * dst, const Uint8 * src, SDL_AudioFormat format,
{ {
Uint16 src1, src2; Uint16 src1, src2;
int dst_sample; int dst_sample;
const int max_audioval = 0xFFFF; const int max_audioval = SDL_MAX_UINT16;
len /= 2; len /= 2;
while (len--) { while (len--) {
src1 = ((src[0]) << 8 | src[1]); src1 = SDL_SwapBE16(*(Uint16 *)src);
ADJUST_VOLUME(src1, volume); ADJUST_VOLUME(src1, volume);
src2 = ((dst[0]) << 8 | dst[1]); src2 = SDL_SwapBE16(*(Uint16 *)dst);
src += 2; src += 2;
dst_sample = src1 + src2; dst_sample = src1 + src2;
if (dst_sample > max_audioval) { if (dst_sample > max_audioval) {
dst_sample = max_audioval; dst_sample = max_audioval;
} }
dst[1] = dst_sample & 0xFF; *(Uint16 *)dst = SDL_SwapBE16(dst_sample);
dst_sample >>= 8;
dst[0] = dst_sample & 0xFF;
dst += 2; dst += 2;
} }
} }
@ -245,8 +236,8 @@ SDL_MixAudioFormat(Uint8 * dst, const Uint8 * src, SDL_AudioFormat format,
Uint32 *dst32 = (Uint32 *) dst; Uint32 *dst32 = (Uint32 *) dst;
Sint64 src1, src2; Sint64 src1, src2;
Sint64 dst_sample; Sint64 dst_sample;
const Sint64 max_audioval = ((((Sint64) 1) << (32 - 1)) - 1); const Sint64 max_audioval = SDL_MAX_SINT32;
const Sint64 min_audioval = -(((Sint64) 1) << (32 - 1)); const Sint64 min_audioval = SDL_MIN_SINT32;
len /= 4; len /= 4;
while (len--) { while (len--) {
@ -271,8 +262,8 @@ SDL_MixAudioFormat(Uint8 * dst, const Uint8 * src, SDL_AudioFormat format,
Uint32 *dst32 = (Uint32 *) dst; Uint32 *dst32 = (Uint32 *) dst;
Sint64 src1, src2; Sint64 src1, src2;
Sint64 dst_sample; Sint64 dst_sample;
const Sint64 max_audioval = ((((Sint64) 1) << (32 - 1)) - 1); const Sint64 max_audioval = SDL_MAX_SINT32;
const Sint64 min_audioval = -(((Sint64) 1) << (32 - 1)); const Sint64 min_audioval = SDL_MIN_SINT32;
len /= 4; len /= 4;
while (len--) { while (len--) {