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authordec05eba <dec05eba@protonmail.com>2024-04-14 00:02:47 +0200
committerdec05eba <dec05eba@protonmail.com>2024-04-14 00:02:47 +0200
commit2692a7d22c0b691f7f27f969c91e7af05c8ede7d (patch)
tree3697649ab946e53be25e0f157e1e70f3bc77b5f1 /src/sound.cpp
parent24c13ceaab1ea2ef026d6d94558d703ab8bebe82 (diff)
Testing audio latency compensation
Diffstat (limited to 'src/sound.cpp')
-rw-r--r--src/sound.cpp19
1 files changed, 15 insertions, 4 deletions
diff --git a/src/sound.cpp b/src/sound.cpp
index 485548b..8be32b2 100644
--- a/src/sound.cpp
+++ b/src/sound.cpp
@@ -41,6 +41,7 @@ struct pa_handle {
size_t output_index, output_length;
int operation_success;
+ double latency_seconds;
};
static void pa_sound_device_free(pa_handle *s) {
@@ -79,8 +80,9 @@ static pa_handle* pa_sound_device_new(const char *server,
p->read_data = NULL;
p->read_length = 0;
p->read_index = 0;
+ p->latency_seconds = 0.0;
- const int buffer_size = attr->maxlength;
+ const int buffer_size = attr->fragsize;
void *buffer = malloc(buffer_size);
if(!buffer) {
fprintf(stderr, "failed to allocate buffer for audio\n");
@@ -161,6 +163,9 @@ static int pa_sound_device_read(pa_handle *p, double timeout_seconds) {
bool success = false;
int r = 0;
int *rerror = &r;
+ pa_usec_t latency = 0;
+ int negative = 0;
+
CHECK_DEAD_GOTO(p, rerror, fail);
while (p->output_index < p->output_length) {
@@ -193,6 +198,10 @@ static int pa_sound_device_read(pa_handle *p, double timeout_seconds) {
CHECK_DEAD_GOTO(p, rerror, fail);
continue;
}
+
+ if(pa_stream_get_latency(p->stream, &latency, &negative) >= 0) {
+ p->latency_seconds = (negative ? -(int64_t)latency : (int64_t)latency) * 0.000001;
+ }
}
const size_t space_free_in_output_buffer = p->output_length - p->output_index;
@@ -255,8 +264,8 @@ int sound_device_get_by_name(SoundDevice *device, const char *device_name, const
buffer_attr.tlength = -1;
buffer_attr.prebuf = -1;
buffer_attr.minreq = -1;
- buffer_attr.maxlength = period_frame_size * audio_format_to_get_bytes_per_sample(audio_format) * num_channels; // 2/4 bytes/sample, @num_channels channels
- buffer_attr.fragsize = buffer_attr.maxlength;
+ buffer_attr.maxlength = -1;
+ buffer_attr.fragsize = period_frame_size * audio_format_to_get_bytes_per_sample(audio_format) * num_channels; // 2/4 bytes/sample, @num_channels channels
int error = 0;
pa_handle *handle = pa_sound_device_new(nullptr, description, device_name, description, &ss, &buffer_attr, &error);
@@ -276,13 +285,15 @@ void sound_device_close(SoundDevice *device) {
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_sec) {
pa_handle *pa = (pa_handle*)device->handle;
if(pa_sound_device_read(pa, timeout_sec) < 0) {
//fprintf(stderr, "pa_simple_read() failed: %s\n", pa_strerror(error));
+ *latency_sec = 0.0;
return -1;
}
*buffer = pa->output_data;
+ *latency_sec = pa->latency_seconds;
return device->frames;
}