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change alsa to use non-blocking mode

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Original commit message from CVS:
change alsa to use non-blocking mode
This commit is contained in:
Benjamin Otte 2003-04-22 23:33:04 +00:00
parent 35c9b84644
commit 7d5843f31f
1 changed files with 12 additions and 5 deletions
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17
ext/alsa/gstalsa.c
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@ -1530,8 +1530,8 @@ gst_alsa_open_audio (GstAlsa *this)
ERROR_CHECK (snd_output_stdio_attach (&this->out, stderr, 0),
"error opening log output: %s");
/* blocking i/o */
ERROR_CHECK (snd_pcm_open (&this->handle, this->device, this->stream, 0),
/* we use non-blocking i/o */
ERROR_CHECK (snd_pcm_open (&this->handle, this->device, this->stream, SND_PCM_NONBLOCK),
"error opening pcm device %s: %s\n", this->device);
GST_FLAG_SET (this, GST_ALSA_OPEN);
@ -1690,6 +1690,8 @@ gst_alsa_start_audio (GstAlsa *this)
static gboolean
gst_alsa_drain_audio (GstAlsa *this)
{
int err;
g_assert (this != NULL);
g_return_val_if_fail (this != NULL, FALSE);
g_return_val_if_fail (this->handle != NULL, FALSE);
@ -1700,9 +1702,14 @@ gst_alsa_drain_audio (GstAlsa *this)
(snd_pcm_state (this->handle) == SND_PCM_STATE_PAUSED ||
snd_pcm_state (this->handle) == SND_PCM_STATE_XRUN ||
snd_pcm_state (this->handle) == SND_PCM_STATE_RUNNING)) {
ERROR_CHECK (snd_pcm_drain (this->handle),
"couldn't stop and drain buffer: %s");
gst_alsa_clock_stop (this->clock);
/* snd_pcm_drain returns -EAGAIN in non-blocking mode while it outputs sound */
err = snd_pcm_drain (this->handle);
while (err == -EAGAIN) {
g_usleep (1000);
err = snd_pcm_drain (this->handle);
}
ERROR_CHECK (err, "couldn't stop and drain buffer: %s");
}
GST_FLAG_UNSET (this, GST_ALSA_RUNNING);
@ -1721,9 +1728,9 @@ gst_alsa_stop_audio (GstAlsa *this)
(snd_pcm_state (this->handle) == SND_PCM_STATE_PAUSED ||
snd_pcm_state (this->handle) == SND_PCM_STATE_XRUN ||
snd_pcm_state (this->handle) == SND_PCM_STATE_RUNNING)) {
gst_alsa_clock_stop (this->clock);
ERROR_CHECK (snd_pcm_drop (this->handle),
"couldn't stop (dropping frames): %s");
gst_alsa_clock_stop (this->clock);
}
GST_FLAG_UNSET (this, GST_ALSA_RUNNING);