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Converter: Smarter, if less portable, endian swap

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For big endian sample formats, endianness can be swapped using Clang
specific byte swap functions, which are present in all supported
versions of Xcode.

Signed-off-by: Christopher Snowhill <kode54@gmail.com>
This commit is contained in:
Christopher Snowhill 2022-02-12 00:38:08 -08:00
parent 5f68131437
commit c39b7ee96a
1 changed files with 13 additions and 27 deletions
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40
Audio/Chain/ConverterNode.m
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@ -358,53 +358,39 @@ static void convert_f64_to_f32(float *output, const double *input, size_t count)
static void convert_be_to_le(uint8_t *buffer, size_t bitsPerSample, size_t bytes) {
size_t i;
uint8_t temp;
bitsPerSample = (bitsPerSample + 7) / 8;
switch(bitsPerSample) {
case 2:
for(i = 0; i < bytes; i += 2) {
temp = buffer[1];
buffer[1] = buffer[0];
buffer[0] = temp;
*(int16_t *)buffer = __builtin_bswap16(*(int16_t *)buffer);
buffer += 2;
}
break;
case 3:
case 3: {
union {
vDSP_int24 int24;
uint32_t int32;
} intval;
intval.int32 = 0;
for(i = 0; i < bytes; i += 3) {
temp = buffer[2];
buffer[2] = buffer[0];
buffer[0] = temp;
intval.int24 = *(vDSP_int24 *)buffer;
intval.int32 = __builtin_bswap32(intval.int32 << 8);
*(vDSP_int24 *)buffer = intval.int24;
buffer += 3;
}
break;
} break;
case 4:
for(i = 0; i < bytes; i += 4) {
temp = buffer[3];
buffer[3] = buffer[0];
buffer[0] = temp;
temp = buffer[2];
buffer[2] = buffer[1];
buffer[1] = temp;
*(uint32_t *)buffer = __builtin_bswap32(*(uint32_t *)buffer);
buffer += 4;
}
break;
case 8:
for(i = 0; i < bytes; i += 8) {
temp = buffer[7];
buffer[7] = buffer[0];
buffer[0] = temp;
temp = buffer[6];
buffer[6] = buffer[1];
buffer[1] = temp;
temp = buffer[5];
buffer[5] = buffer[2];
buffer[2] = temp;
temp = buffer[4];
buffer[4] = buffer[3];
buffer[3] = temp;
*(uint64_t *)buffer = __builtin_bswap64(*(uint64_t *)buffer);
buffer += 8;
}
break;