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AudioTrack: set buffer size and period size correctly

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Android buffer size is in bytes, but ALSA buffer size is in frames. Also
the period size was not set previously.

This fixes several audio issues on postmarketOS and probably other
distributions that still use PulseAudio instead of PipeWire.
This commit is contained in:
Julian Winkler 2024-12-30 09:42:37 +01:00
parent d6f50e160c
commit 09a38f9a28
1 changed files with 8 additions and 2 deletions
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10
src/api-impl-jni/audio/android_media_AudioTrack.c
View file

@ -43,6 +43,7 @@ JNIEXPORT void JNICALL Java_android_media_AudioTrack_native_1constructor(JNIEnv
unsigned int channels_out;
unsigned int period_time;
unsigned int buffer_time;
int ret;
@ -55,10 +56,15 @@ JNIEXPORT void JNICALL Java_android_media_AudioTrack_native_1constructor(JNIEnv
helper_hw_params_init(pcm_handle, params, rate, channels, SND_PCM_FORMAT_S16_LE);
/*--↓*/
snd_pcm_uframes_t buffer_size_as_uframes_t = buffer_size;
snd_pcm_uframes_t buffer_size_as_uframes_t = buffer_size / channels / 2; // 2 means PCM16
snd_pcm_hw_params_set_buffer_size_near (pcm_handle, params, &buffer_size_as_uframes_t);
/*--↑*/
/* set the period time to 1/4 of the buffer time */
ret = snd_pcm_hw_params_get_buffer_time(params, &buffer_time, NULL);
period_time = buffer_time / 4;
ret = snd_pcm_hw_params_set_period_time_near(pcm_handle, params, &period_time, NULL);
/* Write parameters */
ret = snd_pcm_hw_params(pcm_handle, params);
if (ret < 0)
@ -78,7 +84,7 @@ JNIEXPORT void JNICALL Java_android_media_AudioTrack_native_1constructor(JNIEnv
snd_pcm_sw_params_malloc (&sw_params);
snd_pcm_sw_params_current (pcm_handle, sw_params);
snd_pcm_sw_params_set_start_threshold(pcm_handle, sw_params, buffer_size - period_size);
snd_pcm_sw_params_set_start_threshold(pcm_handle, sw_params, (buffer_size_as_uframes_t / period_size) * period_size);
snd_pcm_sw_params_set_avail_min(pcm_handle, sw_params, period_size);
snd_pcm_sw_params(pcm_handle, sw_params);