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LIBRETRO: add empty audio buffer to use for GUI framerate control

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This commit is contained in:
Giovanni Cascione 2023-07-09 17:04:31 +02:00
parent d18ad98339
commit 3d67e4bcc1
1 changed files with 13 additions and 19 deletions
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32
backends/platform/libretro/src/libretro.cpp
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@ -102,10 +102,12 @@ static uint32 perf_ref_frame = 0;
static uint32 perf_ref_audio_buff_occupancy = 0; static uint32 perf_ref_audio_buff_occupancy = 0;
float frame_rate = 0; float frame_rate = 0;
uint16 sample_rate = 0;
static uint16 samples_per_frame = 0; // length in samples per frame static uint16 samples_per_frame = 0; // length in samples per frame
static size_t samples_per_frame_buffer_size = 0; static size_t samples_per_frame_buffer_size = 0;
static int16_t *sound_buffer = NULL; // pointer to output buffer static int16_t *sound_buffer = NULL; // pointer to output buffer
static int16_t *sound_buffer_empty = NULL; // pointer to zeroed output buffer, to regulate GUI FPS
static void log_scummvm_exit_code(void) { static void log_scummvm_exit_code(void) {
if (retro_get_scummvm_res() == Common::kNoError) if (retro_get_scummvm_res() == Common::kNoError)
@ -119,15 +121,15 @@ static void log_scummvm_exit_code(void) {
static void audio_buffer_init(uint16 sample_rate, uint16 frame_rate) { static void audio_buffer_init(uint16 sample_rate, uint16 frame_rate) {
samples_per_frame = sample_rate / frame_rate; samples_per_frame = sample_rate / frame_rate;
samples_per_frame_buffer_size = samples_per_frame << 1 * sizeof(int16_t); samples_per_frame_buffer_size = samples_per_frame << sizeof(int16_t);
if (sound_buffer) sound_buffer = sound_buffer ? (int16_t *)realloc(sound_buffer, samples_per_frame_buffer_size) : (int16_t *)malloc(samples_per_frame_buffer_size);
sound_buffer = (int16_t *)realloc(sound_buffer, samples_per_frame_buffer_size); sound_buffer_empty = sound_buffer_empty ? (int16_t *)realloc(sound_buffer_empty, samples_per_frame_buffer_size) : (int16_t *)malloc(samples_per_frame_buffer_size);
else
sound_buffer = (int16_t *)malloc(samples_per_frame_buffer_size); if (sound_buffer && sound_buffer_empty) {
if (sound_buffer)
memset(sound_buffer, 0, samples_per_frame_buffer_size); memset(sound_buffer, 0, samples_per_frame_buffer_size);
else memset(sound_buffer_empty, 0, samples_per_frame_buffer_size);
} else
log_cb(RETRO_LOG_ERROR, "audio_buffer_init error.\n"); log_cb(RETRO_LOG_ERROR, "audio_buffer_init error.\n");
audio_status |= AUDIO_STATUS_UPDATE_LATENCY; audio_status |= AUDIO_STATUS_UPDATE_LATENCY;
@ -829,17 +831,9 @@ void retro_run(void) {
video_cb(screen.getPixels(), screen.w, screen.h, screen.pitch); video_cb(screen.getPixels(), screen.w, screen.h, screen.pitch);
} }
#if defined(_3DS) if (audio_status & AUDIO_STATUS_MUTE)
/* Hack: 3DS will produce static noise audio_batch_cb((int16_t *) sound_buffer_empty, samples_per_frame_buffer_size >> sizeof(int16_t));
* unless we manually send a zeroed else
* audio buffer when no samples are
* available (i.e. when the overlay
* is shown) */
if (audio_status & AUDIO_STATUS_MUTE) {
audio_buffer_init(SAMPLE_RATE, (uint16) frame_rate);
}
#endif
if (!(audio_status & AUDIO_STATUS_MUTE))
audio_batch_cb((int16_t *) sound_buffer, samples_count); audio_batch_cb((int16_t *) sound_buffer, samples_count);
current_frame++; current_frame++;