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feat(examples): added playback timestamp extraction to ALSA example. (#190)

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This commit is contained in:
Alexander Kraus
2025-06-04 15:44:31 +02:00
committed by GitHub
parent d342c9961d
commit d6badb97be
1 changed files with 22 additions and 3 deletions
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25
examples/code/C/cplay.unix.c
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@ -2,12 +2,17 @@
#include <pthread.h> #include <pthread.h>
#include <stdio.h> #include <stdio.h>
#include <stdint.h> #include <stdint.h>
#include <time.h>
#include "physics_girl_st.h" #include "physics_girl_st.h"
static SUsample sound_buffer[SU_LENGTH_IN_SAMPLES * SU_CHANNEL_COUNT]; static SUsample sound_buffer[SU_LENGTH_IN_SAMPLES * SU_CHANNEL_COUNT];
static snd_pcm_t *pcm_handle; static snd_pcm_t *pcm_handle;
static pthread_t render_thread; static pthread_t render_thread, playback_thread;
static uint32_t render_thread_handle; static uint32_t render_thread_handle, playback_thread_handle;
void play() {
snd_pcm_writei(pcm_handle, sound_buffer, SU_LENGTH_IN_SAMPLES);
}
int main(int argc, char **args) { int main(int argc, char **args) {
// Unix does not have gm.dls, no need to ifdef and setup here. // Unix does not have gm.dls, no need to ifdef and setup here.
@ -33,7 +38,21 @@ int main(int argc, char **args) {
0, 0,
SU_LENGTH_IN_SAMPLES SU_LENGTH_IN_SAMPLES
); );
snd_pcm_writei(pcm_handle, sound_buffer, SU_LENGTH_IN_SAMPLES); playback_thread_handle = pthread_create(&playback_thread, 0, (void *(*)(void *))play, 0);
// This is for obtaining the playback time.
snd_pcm_status_t *status;
snd_pcm_status_malloc(&status);
snd_htimestamp_t htime, htstart;
snd_pcm_status(pcm_handle, status);
snd_pcm_status_get_htstamp(status, &htstart);
for(int sample; sample < SU_LENGTH_IN_SAMPLES; sample = (int)(((float)htime.tv_sec + (float)htime.tv_nsec * 1.e-9 - (float)htstart.tv_sec - (float)htstart.tv_nsec * 1.e-9) * SU_SAMPLE_RATE)) {
snd_pcm_status(pcm_handle, status);
snd_pcm_status_get_htstamp(status, &htime);
printf("Sample: %d\n", sample);
usleep(1000000 / 30);
}
snd_pcm_status_free(status);
return 0; return 0;
} }