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Test latency comp

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dec05eba
2024-04-15 20:30:41 +02:00
parent 21a2e3c3fa
commit 7e239c8aa2
3 changed files with 25 additions and 6 deletions
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2
include/sound.hpp
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@@ -55,7 +55,7 @@ void sound_device_close(SoundDevice *device);
Returns the next chunk of audio into @buffer. Returns the next chunk of audio into @buffer.
Returns the number of frames read, or a negative value on failure. Returns the number of frames read, or a negative value on failure.
*/ */
int sound_device_read_next_chunk(SoundDevice *device, void **buffer, double timeout_sec); int sound_device_read_next_chunk(SoundDevice *device, void **buffer, double timeout_sec, double *latency_seconds);
std::vector<AudioInput> get_pulseaudio_inputs(); std::vector<AudioInput> get_pulseaudio_inputs();

13
src/main.cpp
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@@ -2417,12 +2417,17 @@ int main(int argc, char **argv) {
while(running) { while(running) {
void *sound_buffer; void *sound_buffer;
int sound_buffer_size = -1; int sound_buffer_size = -1;
if(audio_device.sound_device.handle) const double time_before_read_seconds = clock_get_monotonic_seconds();
sound_buffer_size = sound_device_read_next_chunk(&audio_device.sound_device, &sound_buffer, timeout_sec); if(audio_device.sound_device.handle) {
// TODO: use this instead of calculating time to read. But this can fluctuate and we dont want to go back in time
double latency_seconds = 0.0;
sound_buffer_size = sound_device_read_next_chunk(&audio_device.sound_device, &sound_buffer, timeout_sec, &latency_seconds);
}
const bool got_audio_data = sound_buffer_size >= 0; const bool got_audio_data = sound_buffer_size >= 0;
const double time_after_read_seconds = clock_get_monotonic_seconds();
const double this_audio_frame_time = clock_get_monotonic_seconds() - paused_time_offset; const double time_to_read_seconds = time_after_read_seconds - time_before_read_seconds;
const double this_audio_frame_time = time_after_read_seconds - paused_time_offset - time_to_read_seconds;
if(paused) { if(paused) {
if(got_audio_data) if(got_audio_data)

16
src/sound.cpp
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@@ -41,6 +41,7 @@ struct pa_handle {
size_t output_index, output_length; size_t output_index, output_length;
int operation_success; int operation_success;
double latency_seconds;
}; };
static void pa_sound_device_free(pa_handle *s) { static void pa_sound_device_free(pa_handle *s) {
@@ -79,6 +80,7 @@ static pa_handle* pa_sound_device_new(const char *server,
p->read_data = NULL; p->read_data = NULL;
p->read_length = 0; p->read_length = 0;
p->read_index = 0; p->read_index = 0;
p->latency_seconds = 0.0;
const int buffer_size = attr->fragsize; const int buffer_size = attr->fragsize;
void *buffer = malloc(buffer_size); void *buffer = malloc(buffer_size);
@@ -161,6 +163,9 @@ static int pa_sound_device_read(pa_handle *p, double timeout_seconds) {
bool success = false; bool success = false;
int r = 0; int r = 0;
int *rerror = &r; int *rerror = &r;
pa_usec_t latency = 0;
int negative = 0;
CHECK_DEAD_GOTO(p, rerror, fail); CHECK_DEAD_GOTO(p, rerror, fail);
while (p->output_index < p->output_length) { while (p->output_index < p->output_length) {
@@ -193,6 +198,13 @@ static int pa_sound_device_read(pa_handle *p, double timeout_seconds) {
CHECK_DEAD_GOTO(p, rerror, fail); CHECK_DEAD_GOTO(p, rerror, fail);
continue; continue;
} }
if(pa_stream_get_latency(p->stream, &latency, &negative) >= 0) {
p->latency_seconds = negative ? -(int64_t)latency : latency;
p->latency_seconds *= 0.0000001;
if(p->latency_seconds < 0.0)
p->latency_seconds = 0.0;
}
} }
const size_t space_free_in_output_buffer = p->output_length - p->output_index; const size_t space_free_in_output_buffer = p->output_length - p->output_index;
@@ -276,13 +288,15 @@ void sound_device_close(SoundDevice *device) {
device->handle = NULL; device->handle = NULL;
} }
int sound_device_read_next_chunk(SoundDevice *device, void **buffer, double timeout_sec) { int sound_device_read_next_chunk(SoundDevice *device, void **buffer, double timeout_sec, double *latency_seconds) {
pa_handle *pa = (pa_handle*)device->handle; pa_handle *pa = (pa_handle*)device->handle;
if(pa_sound_device_read(pa, timeout_sec) < 0) { if(pa_sound_device_read(pa, timeout_sec) < 0) {
//fprintf(stderr, "pa_simple_read() failed: %s\n", pa_strerror(error)); //fprintf(stderr, "pa_simple_read() failed: %s\n", pa_strerror(error));
*latency_seconds = 0.0;
return -1; return -1;
} }
*buffer = pa->output_data; *buffer = pa->output_data;
*latency_seconds = pa->latency_seconds;
return device->frames; return device->frames;
} }