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Fixed audio channels getting swapped twice

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Mr-Wiseguy 2024-03-21 23:56:19 -04:00
parent 976bfa1969
commit b7b7658431
1 changed files with 1 additions and 17 deletions
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18
ultramodern/audio.cpp
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@ -23,31 +23,15 @@ void ultramodern::set_audio_frequency(uint32_t freq) {
}
void ultramodern::queue_audio_buffer(RDRAM_ARG PTR(int16_t) audio_data_, uint32_t byte_count) {
// Buffer for holding the output of swapping the audio channels. This is reused across
// calls to reduce runtime allocations.
static std::vector<int16_t> swap_buffer;
// Ensure that the byte count is an integer multiple of samples.
assert((byte_count & 1) == 0);
// Calculate the number of samples from the number of bytes.
uint32_t sample_count = byte_count / sizeof(int16_t);
// Make sure the swap buffer is large enough to hold all the incoming audio data.
if (sample_count > swap_buffer.size()) {
swap_buffer.resize(sample_count);
}
// Swap the audio channels into the swap buffer to correct for the address xor caused by endianness handling.
int16_t* audio_data = TO_PTR(int16_t, audio_data_);
for (size_t i = 0; i < sample_count; i += 2) {
swap_buffer[i + 0] = audio_data[i + 1];
swap_buffer[i + 1] = audio_data[i + 0];
}
// Queue the swapped audio data.
if (audio_callbacks.queue_samples) {
audio_callbacks.queue_samples(swap_buffer.data(), sample_count);
audio_callbacks.queue_samples(TO_PTR(int16_t, audio_data_), sample_count);
}
}