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alsasink: pause/resume

Browse source 
alsasink can now detect a resume, stop and pause. The sink is now
properly paused using snd_pcm_pause(), and without losing any data
This commit is contained in:
Axel Mårtensson 2018-06-18 10:49:28 +02:00 committed by Robert Rosengren
parent feb1e24347
commit 5d3c948572
2 changed files with 95 additions and 9 deletions
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97
ext/alsa/gstalsasink.c
View file

@ -94,7 +94,9 @@ static gboolean gst_alsasink_close (GstAudioSink * asink);
static gint gst_alsasink_write (GstAudioSink * asink, gpointer data,
guint length);
static guint gst_alsasink_delay (GstAudioSink * asink);
static void gst_alsasink_reset (GstAudioSink * asink);
static void gst_alsasink_pause (GstAudioSink * asink);
static void gst_alsasink_resume (GstAudioSink * asink);
static void gst_alsasink_stop (GstAudioSink * asink);
static gboolean gst_alsasink_acceptcaps (GstAlsaSink * alsa, GstCaps * caps);
static GstBuffer *gst_alsasink_payload (GstAudioBaseSink * sink,
GstBuffer * buf);
@ -181,7 +183,9 @@ gst_alsasink_class_init (GstAlsaSinkClass * klass)
gstaudiosink_class->close = GST_DEBUG_FUNCPTR (gst_alsasink_close);
gstaudiosink_class->write = GST_DEBUG_FUNCPTR (gst_alsasink_write);
gstaudiosink_class->delay = GST_DEBUG_FUNCPTR (gst_alsasink_delay);
gstaudiosink_class->reset = GST_DEBUG_FUNCPTR (gst_alsasink_reset);
gstaudiosink_class->stop = GST_DEBUG_FUNCPTR (gst_alsasink_stop);
gstaudiosink_class->pause = GST_DEBUG_FUNCPTR (gst_alsasink_pause);
gstaudiosink_class->resume = GST_DEBUG_FUNCPTR (gst_alsasink_resume);
g_object_class_install_property (gobject_class, PROP_DEVICE,
g_param_spec_string ("device", "Device",
@ -259,6 +263,9 @@ gst_alsasink_init (GstAlsaSink * alsasink)
alsasink->device = g_strdup (DEFAULT_DEVICE);
alsasink->handle = NULL;
alsasink->cached_caps = NULL;
alsasink->is_paused = FALSE;
alsasink->after_paused = FALSE;
alsasink->hw_support_pause = FALSE;
g_mutex_init (&alsasink->alsa_lock);
g_mutex_init (&alsasink->delay_lock);
@ -545,6 +552,11 @@ retry:
GST_DEBUG_OBJECT (alsa, "buffer size %lu, period size %lu", alsa->buffer_size,
alsa->period_size);
/* Check if hardware supports pause */
alsa->hw_support_pause = snd_pcm_hw_params_can_pause (params);
GST_DEBUG_OBJECT (alsa, "Hw support pause: %s",
alsa->hw_support_pause ? "yes" : "no");
snd_pcm_hw_params_free (params);
return 0;
@ -1084,12 +1096,23 @@ gst_alsasink_delay (GstAudioSink * asink)
{
GstAlsaSink *alsa;
snd_pcm_sframes_t delay;
int res;
int res = 0;
alsa = GST_ALSA_SINK (asink);
GST_DELAY_SINK_LOCK (asink);
res = snd_pcm_delay (alsa->handle, &delay);
if (alsa->is_paused == TRUE) {
delay = alsa->pos_in_buffer;
alsa->is_paused = FALSE;
alsa->after_paused = TRUE;
} else {
if (alsa->after_paused == TRUE) {
delay = alsa->pos_in_buffer;
alsa->after_paused = FALSE;
} else {
res = snd_pcm_delay (alsa->handle, &delay);
}
}
GST_DELAY_SINK_UNLOCK (asink);
if (G_UNLIKELY (res < 0)) {
/* on errors, report 0 delay */
@ -1106,7 +1129,65 @@ gst_alsasink_delay (GstAudioSink * asink)
}
static void
gst_alsasink_reset (GstAudioSink * asink)
gst_alsasink_pause (GstAudioSink * asink)
{
GstAlsaSink *alsa;
gint err;
snd_pcm_sframes_t delay;
alsa = GST_ALSA_SINK (asink);
if (alsa->hw_support_pause == TRUE) {
GST_ALSA_SINK_LOCK (asink);
snd_pcm_delay (alsa->handle, &delay);
alsa->pos_in_buffer = delay;
CHECK (snd_pcm_pause (alsa->handle, 1), pause_error);
GST_DEBUG_OBJECT (alsa, "pause done");
alsa->is_paused = TRUE;
GST_ALSA_SINK_UNLOCK (asink);
} else {
gst_alsasink_stop (asink);
}
return;
pause_error:
{
GST_ERROR_OBJECT (alsa, "alsa-pause: pcm pause error: %s",
snd_strerror (err));
GST_ALSA_SINK_UNLOCK (asink);
return;
}
}
static void
gst_alsasink_resume (GstAudioSink * asink)
{
GstAlsaSink *alsa;
gint err;
alsa = GST_ALSA_SINK (asink);
if (alsa->hw_support_pause == TRUE) {
GST_ALSA_SINK_LOCK (asink);
CHECK (snd_pcm_pause (alsa->handle, 0), resume_error);
GST_DEBUG_OBJECT (alsa, "resume done");
GST_ALSA_SINK_UNLOCK (asink);
}
return;
resume_error:
{
GST_ERROR_OBJECT (alsa, "alsa-resume: pcm resume error: %s",
snd_strerror (err));
GST_ALSA_SINK_UNLOCK (asink);
return;
}
}
static void
gst_alsasink_stop (GstAudioSink * asink)
{
GstAlsaSink *alsa;
gint err;
@ -1118,7 +1199,7 @@ gst_alsasink_reset (GstAudioSink * asink)
CHECK (snd_pcm_drop (alsa->handle), drop_error);
GST_DEBUG_OBJECT (alsa, "prepare");
CHECK (snd_pcm_prepare (alsa->handle), prepare_error);
GST_DEBUG_OBJECT (alsa, "reset done");
GST_DEBUG_OBJECT (alsa, "stop done");
GST_ALSA_SINK_UNLOCK (asink);
return;
@ -1126,14 +1207,14 @@ gst_alsasink_reset (GstAudioSink * asink)
/* ERRORS */
drop_error:
{
GST_ERROR_OBJECT (alsa, "alsa-reset: pcm drop error: %s",
GST_ERROR_OBJECT (alsa, "alsa-stop: pcm drop error: %s",
snd_strerror (err));
GST_ALSA_SINK_UNLOCK (asink);
return;
}
prepare_error:
{
GST_ERROR_OBJECT (alsa, "alsa-reset: pcm prepare error: %s",
GST_ERROR_OBJECT (alsa, "alsa-stop: pcm prepare error: %s",
snd_strerror (err));
GST_ALSA_SINK_UNLOCK (asink);
return;

7
ext/alsa/gstalsasink.h
View file

@ -1,7 +1,7 @@
/* GStreamer
* Copyright (C) 2005 Wim Taymans <wim@fluendo.com>
*
* gstalsasink.h:
* gstalsasink.h:
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
@ -74,6 +74,11 @@ struct _GstAlsaSink {
GstCaps *cached_caps;
gboolean is_paused;
gboolean after_paused;
gboolean hw_support_pause;
snd_pcm_sframes_t pos_in_buffer;
GMutex alsa_lock;
GMutex delay_lock;
};