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Add audio support

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dec05eba
2020-04-01 19:25:16 +02:00
parent 5e60805c36
commit 2fcd3ee3e5
5 changed files with 233 additions and 64 deletions
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19
src/sound.cpp
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@@ -26,8 +26,8 @@ int sound_device_get_by_name(SoundDevice *device, const char *name, unsigned int
snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S16_LE);
snd_pcm_hw_params_set_channels(handle, params, num_channels);
// 44100 bits/second samling rate (CD quality)
unsigned int val = 44100;
// 48000 bits/second samling rate (DVD quality)
unsigned int val = 48000;
int dir;
snd_pcm_hw_params_set_rate_near(handle, params, &val, &dir);
@@ -45,7 +45,7 @@ int sound_device_get_by_name(SoundDevice *device, const char *name, unsigned int
// Use a buffer large enough to hold one period
snd_pcm_hw_params_get_period_size(params, &frames, &dir);
int buffer_size = frames * 2 * num_channels; // 2 bytes/sample, @num_channels channels
char *buffer = (char*)malloc(buffer_size);
void *buffer = malloc(buffer_size);
if(!buffer) {
fprintf(stderr, "failed to allocate buffer for audio\n");
snd_pcm_close(handle);
@@ -61,18 +61,19 @@ int sound_device_get_by_name(SoundDevice *device, const char *name, unsigned int
void sound_device_close(SoundDevice *device) {
/* TODO: Is this also needed in @sound_device_get_by_name on failure? */
snd_pcm_drain((snd_pcm_t*)device->handle);
// TODO: This has been commented out since it causes the thread to block forever. Why?
//snd_pcm_drain((snd_pcm_t*)device->handle);
snd_pcm_close((snd_pcm_t*)device->handle);
free(device->buffer);
}
int sound_device_read_next_chunk(SoundDevice *device, char **buffer) {
int sound_device_read_next_chunk(SoundDevice *device, void **buffer) {
int rc = snd_pcm_readi((snd_pcm_t*)device->handle, device->buffer, device->frames);
if (rc == -EPIPE) {
/* overrun */
fprintf(stderr, "overrun occured\n");
snd_pcm_prepare((snd_pcm_t*)device->handle);
return 0;
return rc;
} else if(rc < 0) {
fprintf(stderr, "failed to read from sound device, reason: %s\n", snd_strerror(rc));
return rc;
@@ -80,5 +81,9 @@ int sound_device_read_next_chunk(SoundDevice *device, char **buffer) {
fprintf(stderr, "short read, read %d frames\n", rc);
}
*buffer = device->buffer;
return 0;
return rc;
}
int sound_device_get_buffer_size(SoundDevice *device) {
return device->buffer_size;
}