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-rw-r--r--NEWS1
-rw-r--r--src/output/alsa_plugin.c50
2 files changed, 48 insertions, 3 deletions
diff --git a/NEWS b/NEWS
index d6d6f073b..43731fcb7 100644
--- a/NEWS
+++ b/NEWS
@@ -29,6 +29,7 @@ ver 0.16 (20??/??/??)
* output:
- recorder: new output plugin for recording radio streams
- alsa: don't recover on CANCEL
+ - alsa: fill period buffer with silence before draining
- openal: new output plugin
- pulse: announce "media.role=music"
- pulse: renamed context to "Music Player Daemon"
diff --git a/src/output/alsa_plugin.c b/src/output/alsa_plugin.c
index 48a40fb9b..64a8127ba 100644
--- a/src/output/alsa_plugin.c
+++ b/src/output/alsa_plugin.c
@@ -69,6 +69,16 @@ struct alsa_data {
/** the size of one audio frame */
size_t frame_size;
+
+ /**
+ * The size of one period, in number of frames.
+ */
+ snd_pcm_uframes_t period_frames;
+
+ /**
+ * The number of frames written in the current period.
+ */
+ snd_pcm_uframes_t period_position;
};
/**
@@ -413,6 +423,9 @@ configure_hw:
g_debug("buffer_size=%u period_size=%u",
(unsigned)alsa_buffer_size, (unsigned)alsa_period_size);
+ ad->period_frames = alsa_period_size;
+ ad->period_position = 0;
+
return true;
error:
@@ -479,6 +492,7 @@ alsa_recover(struct alsa_data *ad, int err)
/* fall-through to snd_pcm_prepare: */
case SND_PCM_STATE_SETUP:
case SND_PCM_STATE_XRUN:
+ ad->period_position = 0;
err = snd_pcm_prepare(ad->pcm);
break;
case SND_PCM_STATE_DISCONNECTED:
@@ -500,8 +514,33 @@ alsa_drain(void *data)
{
struct alsa_data *ad = data;
- if (snd_pcm_state(ad->pcm) == SND_PCM_STATE_RUNNING)
- snd_pcm_drain(ad->pcm);
+ if (snd_pcm_state(ad->pcm) != SND_PCM_STATE_RUNNING)
+ return;
+
+ if (ad->period_position > 0) {
+ /* generate some silence to finish the partial
+ period */
+ snd_pcm_uframes_t nframes =
+ ad->period_frames - ad->period_position;
+ size_t nbytes = nframes * ad->frame_size;
+ void *buffer = g_malloc(nbytes);
+ snd_pcm_hw_params_t *params;
+ snd_pcm_format_t format;
+ unsigned channels;
+
+ snd_pcm_hw_params_alloca(&params);
+ snd_pcm_hw_params_current(ad->pcm, params);
+ snd_pcm_hw_params_get_format(params, &format);
+ snd_pcm_hw_params_get_channels(params, &channels);
+
+ snd_pcm_format_set_silence(format, buffer, nframes * channels);
+ ad->writei(ad->pcm, buffer, nframes);
+ g_free(buffer);
+ }
+
+ snd_pcm_drain(ad->pcm);
+
+ ad->period_position = 0;
}
static void
@@ -509,6 +548,8 @@ alsa_cancel(void *data)
{
struct alsa_data *ad = data;
+ ad->period_position = 0;
+
snd_pcm_drop(ad->pcm);
}
@@ -529,8 +570,11 @@ alsa_play(void *data, const void *chunk, size_t size, GError **error)
while (true) {
snd_pcm_sframes_t ret = ad->writei(ad->pcm, chunk, size);
- if (ret > 0)
+ if (ret > 0) {
+ ad->period_position = (ad->period_position + ret)
+ % ad->period_frames;
return ret * ad->frame_size;
+ }
if (ret < 0 && ret != -EAGAIN && ret != -EINTR &&
alsa_recover(ad, ret) < 0) {