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Reduced audio buffer size compensation by 1 vertical refresh

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Mr-Wiseguy 2023-03-05 20:16:55 -05:00
parent 6ab12039ed
commit 937c64f544
1 changed files with 6 additions and 4 deletions
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10
portultra/audio.cpp
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@ -67,6 +67,8 @@ void Multilibultra::queue_audio_buffer(RDRAM_ARG PTR(s16) audio_data_, uint32_t
SDL_QueueAudio(audio_device, swap_buffer.data(), byte_count);
}
uint32_t buffer_offset_frames = 1;
// If there's ever any audio popping, check here first. Some games are very sensitive to
// the remaining sample count and reporting a number that's too high here can lead to issues.
// Reporting a number that's too low can lead to audio lag in some games.
@ -74,13 +76,13 @@ uint32_t Multilibultra::get_remaining_audio_bytes() {
// Get the number of remaining buffered audio bytes.
uint32_t buffered_byte_count = SDL_GetQueuedAudioSize(audio_device);
// Adjust the reported count to be four refreshes in the future, which helps ensure that
// there are enough samples even if the game experiences a small amount of lag. This prevents
// Adjust the reported count to be some number of refreshes in the future, which helps ensure that
// there are enough samples even if the audio thread experiences a small amount of lag. This prevents
// audio popping on games that use the buffered audio byte count to determine how many samples
// to generate.
uint32_t samples_per_vi = (sample_rate / 60);
if (buffered_byte_count > (4u * samples_per_vi)) {
buffered_byte_count -= (4u * samples_per_vi);
if (buffered_byte_count > (buffer_offset_frames * sizeof(int16_t) * samples_per_vi)) {
buffered_byte_count -= (buffer_offset_frames * sizeof(int16_t) * samples_per_vi);
} else {
buffered_byte_count = 0;
}