2 * Copyright (C) 2008 Ole André Vadla Ravnås <ole.andre.ravnas@tandberg.com>
3 * Copyright (C) 2013 Collabora Ltd.
4 * Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>
5 * Copyright (C) 2018 Centricular Ltd.
6 * Author: Nirbheek Chauhan <nirbheek@centricular.com>
7 * Copyright (C) 2020 Seungha Yang <seungha@centricular.com>
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Library General Public
11 * License as published by the Free Software Foundation; either
12 * version 2 of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Library General Public License for more details.
19 * You should have received a copy of the GNU Library General Public
20 * License along with this library; if not, write to the
21 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
22 * Boston, MA 02110-1301, USA.
26 * SECTION:element-wasapi2sink
29 * Provides audio playback using the Windows Audio Session API available with
32 * ## Example pipelines
34 * gst-launch-1.0 -v audiotestsrc samplesperbuffer=160 ! wasapi2sink
35 * ]| Generate 20 ms buffers and render to the default audio device.
38 * gst-launch-1.0 -v audiotestsrc samplesperbuffer=160 ! wasapi2sink low-latency=true
39 * ]| Same as above, but with the minimum possible latency
46 #include "gstwasapi2sink.h"
47 #include "gstwasapi2util.h"
48 #include "gstwasapi2client.h"
50 GST_DEBUG_CATEGORY_STATIC (gst_wasapi2_sink_debug);
51 #define GST_CAT_DEFAULT gst_wasapi2_sink_debug
53 static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
56 GST_STATIC_CAPS (GST_WASAPI2_STATIC_CAPS));
58 #define DEFAULT_LOW_LATENCY FALSE
59 #define DEFAULT_MUTE FALSE
60 #define DEFAULT_VOLUME 1.0
62 #define GST_WASAPI2_SINK_LOCK(s) g_mutex_lock(&(s)->lock)
63 #define GST_WASAPI2_SINK_UNLOCK(s) g_mutex_unlock(&(s)->lock)
74 struct _GstWasapi2Sink
78 GstWasapi2Client *client;
88 gboolean mute_changed;
89 gboolean volume_changed;
91 /* to protect audioclient from set/get property */
95 static void gst_wasapi2_sink_dispose (GObject * object);
96 static void gst_wasapi2_sink_finalize (GObject * object);
97 static void gst_wasapi2_sink_set_property (GObject * object, guint prop_id,
98 const GValue * value, GParamSpec * pspec);
99 static void gst_wasapi2_sink_get_property (GObject * object, guint prop_id,
100 GValue * value, GParamSpec * pspec);
102 static GstCaps *gst_wasapi2_sink_get_caps (GstBaseSink * bsink,
105 static gboolean gst_wasapi2_sink_prepare (GstAudioSink * asink,
106 GstAudioRingBufferSpec * spec);
107 static gboolean gst_wasapi2_sink_unprepare (GstAudioSink * asink);
108 static gboolean gst_wasapi2_sink_open (GstAudioSink * asink);
109 static gboolean gst_wasapi2_sink_close (GstAudioSink * asink);
110 static gint gst_wasapi2_sink_write (GstAudioSink * asink,
111 gpointer data, guint length);
112 static guint gst_wasapi2_sink_delay (GstAudioSink * asink);
113 static void gst_wasapi2_sink_reset (GstAudioSink * asink);
115 static void gst_wasapi2_sink_set_mute (GstWasapi2Sink * self, gboolean mute);
116 static gboolean gst_wasapi2_sink_get_mute (GstWasapi2Sink * self);
117 static void gst_wasapi2_sink_set_volume (GstWasapi2Sink * self, gdouble volume);
118 static gdouble gst_wasapi2_sink_get_volume (GstWasapi2Sink * self);
120 #define gst_wasapi2_sink_parent_class parent_class
121 G_DEFINE_TYPE_WITH_CODE (GstWasapi2Sink, gst_wasapi2_sink, GST_TYPE_AUDIO_SINK,
122 G_IMPLEMENT_INTERFACE (GST_TYPE_STREAM_VOLUME, NULL));
125 gst_wasapi2_sink_class_init (GstWasapi2SinkClass * klass)
127 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
128 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
129 GstBaseSinkClass *basesink_class = GST_BASE_SINK_CLASS (klass);
130 GstAudioSinkClass *audiosink_class = GST_AUDIO_SINK_CLASS (klass);
132 gobject_class->dispose = gst_wasapi2_sink_dispose;
133 gobject_class->finalize = gst_wasapi2_sink_finalize;
134 gobject_class->set_property = gst_wasapi2_sink_set_property;
135 gobject_class->get_property = gst_wasapi2_sink_get_property;
137 g_object_class_install_property (gobject_class, PROP_DEVICE,
138 g_param_spec_string ("device", "Device",
139 "WASAPI playback device as a GUID string",
140 NULL, GST_PARAM_MUTABLE_READY | G_PARAM_READWRITE |
141 G_PARAM_STATIC_STRINGS));
143 g_object_class_install_property (gobject_class, PROP_LOW_LATENCY,
144 g_param_spec_boolean ("low-latency", "Low latency",
145 "Optimize all settings for lowest latency. Always safe to enable.",
146 DEFAULT_LOW_LATENCY, GST_PARAM_MUTABLE_READY | G_PARAM_READWRITE |
147 G_PARAM_STATIC_STRINGS));
149 g_object_class_install_property (gobject_class, PROP_MUTE,
150 g_param_spec_boolean ("mute", "Mute", "Mute state of this stream",
151 DEFAULT_MUTE, GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE |
152 G_PARAM_STATIC_STRINGS));
154 g_object_class_install_property (gobject_class, PROP_VOLUME,
155 g_param_spec_double ("volume", "Volume", "Volume of this stream",
156 0.0, 1.0, DEFAULT_VOLUME,
157 GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE |
158 G_PARAM_STATIC_STRINGS));
160 gst_element_class_add_static_pad_template (element_class, &sink_template);
161 gst_element_class_set_static_metadata (element_class, "Wasapi2Sink",
162 "Sink/Audio/Hardware",
163 "Stream audio to an audio capture device through WASAPI",
164 "Nirbheek Chauhan <nirbheek@centricular.com>, "
165 "Ole André Vadla Ravnås <ole.andre.ravnas@tandberg.com>, "
166 "Seungha Yang <seungha@centricular.com>");
168 basesink_class->get_caps = GST_DEBUG_FUNCPTR (gst_wasapi2_sink_get_caps);
170 audiosink_class->prepare = GST_DEBUG_FUNCPTR (gst_wasapi2_sink_prepare);
171 audiosink_class->unprepare = GST_DEBUG_FUNCPTR (gst_wasapi2_sink_unprepare);
172 audiosink_class->open = GST_DEBUG_FUNCPTR (gst_wasapi2_sink_open);
173 audiosink_class->close = GST_DEBUG_FUNCPTR (gst_wasapi2_sink_close);
174 audiosink_class->write = GST_DEBUG_FUNCPTR (gst_wasapi2_sink_write);
175 audiosink_class->delay = GST_DEBUG_FUNCPTR (gst_wasapi2_sink_delay);
176 audiosink_class->reset = GST_DEBUG_FUNCPTR (gst_wasapi2_sink_reset);
178 GST_DEBUG_CATEGORY_INIT (gst_wasapi2_sink_debug, "wasapi2sink",
179 0, "Windows audio session API sink");
183 gst_wasapi2_sink_init (GstWasapi2Sink * self)
185 self->low_latency = DEFAULT_LOW_LATENCY;
186 self->mute = DEFAULT_MUTE;
187 self->volume = DEFAULT_VOLUME;
189 g_mutex_init (&self->lock);
193 gst_wasapi2_sink_dispose (GObject * object)
195 GstWasapi2Sink *self = GST_WASAPI2_SINK (object);
197 GST_WASAPI2_SINK_LOCK (self);
198 gst_clear_object (&self->client);
199 gst_clear_caps (&self->cached_caps);
200 GST_WASAPI2_SINK_UNLOCK (self);
202 G_OBJECT_CLASS (parent_class)->dispose (object);
206 gst_wasapi2_sink_finalize (GObject * object)
208 GstWasapi2Sink *self = GST_WASAPI2_SINK (object);
210 g_free (self->device_id);
211 g_mutex_clear (&self->lock);
213 G_OBJECT_CLASS (parent_class)->finalize (object);
217 gst_wasapi2_sink_set_property (GObject * object, guint prop_id,
218 const GValue * value, GParamSpec * pspec)
220 GstWasapi2Sink *self = GST_WASAPI2_SINK (object);
224 g_free (self->device_id);
225 self->device_id = g_value_dup_string (value);
227 case PROP_LOW_LATENCY:
228 self->low_latency = g_value_get_boolean (value);
231 gst_wasapi2_sink_set_mute (self, g_value_get_boolean (value));
234 gst_wasapi2_sink_set_volume (self, g_value_get_double (value));
237 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
243 gst_wasapi2_sink_get_property (GObject * object, guint prop_id,
244 GValue * value, GParamSpec * pspec)
246 GstWasapi2Sink *self = GST_WASAPI2_SINK (object);
250 g_value_set_string (value, self->device_id);
252 case PROP_LOW_LATENCY:
253 g_value_set_boolean (value, self->low_latency);
256 g_value_set_boolean (value, gst_wasapi2_sink_get_mute (self));
259 g_value_set_double (value, gst_wasapi2_sink_get_volume (self));
262 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
268 gst_wasapi2_sink_get_caps (GstBaseSink * bsink, GstCaps * filter)
270 GstWasapi2Sink *self = GST_WASAPI2_SINK (bsink);
271 GstCaps *caps = NULL;
273 /* store one caps here so that we can return device caps even if
274 * audioclient was closed due to unprepare() */
275 if (!self->cached_caps && self->client)
276 self->cached_caps = gst_wasapi2_client_get_caps (self->client);
279 caps = gst_wasapi2_client_get_caps (self->client);
281 if (!caps && self->cached_caps)
282 caps = gst_caps_ref (self->cached_caps);
285 caps = gst_pad_get_pad_template_caps (bsink->sinkpad);
289 gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
290 gst_caps_unref (caps);
294 GST_DEBUG_OBJECT (self, "returning caps %" GST_PTR_FORMAT, caps);
300 gst_wasapi2_sink_open_unlocked (GstAudioSink * asink)
302 GstWasapi2Sink *self = GST_WASAPI2_SINK (asink);
305 gst_wasapi2_client_new (GST_WASAPI2_CLIENT_DEVICE_CLASS_RENDER,
306 self->low_latency, -1, self->device_id);
308 return ! !self->client;
312 gst_wasapi2_sink_open (GstAudioSink * asink)
314 GstWasapi2Sink *self = GST_WASAPI2_SINK (asink);
317 GST_DEBUG_OBJECT (self, "Opening device");
319 GST_WASAPI2_SINK_LOCK (self);
320 ret = gst_wasapi2_sink_open_unlocked (asink);
321 GST_WASAPI2_SINK_UNLOCK (self);
324 GST_ELEMENT_ERROR (self, RESOURCE, OPEN_WRITE, (NULL),
325 ("Failed to open device"));
333 gst_wasapi2_sink_close (GstAudioSink * asink)
335 GstWasapi2Sink *self = GST_WASAPI2_SINK (asink);
337 GST_WASAPI2_SINK_LOCK (self);
339 gst_clear_object (&self->client);
340 gst_clear_caps (&self->cached_caps);
341 self->started = FALSE;
343 GST_WASAPI2_SINK_UNLOCK (self);
349 gst_wasapi2_sink_prepare (GstAudioSink * asink, GstAudioRingBufferSpec * spec)
351 GstWasapi2Sink *self = GST_WASAPI2_SINK (asink);
352 GstAudioBaseSink *bsink = GST_AUDIO_BASE_SINK (asink);
353 gboolean ret = FALSE;
355 GST_WASAPI2_SINK_LOCK (self);
356 if (!self->client && !gst_wasapi2_sink_open_unlocked (asink)) {
357 GST_ERROR_OBJECT (self, "No audio client was configured");
361 if (!gst_wasapi2_client_open (self->client, spec, bsink->ringbuffer)) {
362 GST_ERROR_OBJECT (self, "Couldn't open audio client");
366 /* Set mute and volume here again, maybe when "mute" property was set, audioclient
367 * might not be configured at that moment */
368 if (self->mute_changed) {
369 gst_wasapi2_client_set_mute (self->client, self->mute);
370 self->mute_changed = FALSE;
373 if (self->volume_changed) {
374 gst_wasapi2_client_set_volume (self->client, self->volume);
375 self->volume_changed = FALSE;
378 /* Will start IAudioClient on the first write request */
379 self->started = FALSE;
383 GST_WASAPI2_SINK_UNLOCK (self);
389 gst_wasapi2_sink_unprepare (GstAudioSink * asink)
391 GstWasapi2Sink *self = GST_WASAPI2_SINK (asink);
393 self->started = FALSE;
395 /* Will reopen device later prepare() */
396 GST_WASAPI2_SINK_LOCK (self);
398 gst_wasapi2_client_stop (self->client);
399 gst_clear_object (&self->client);
401 GST_WASAPI2_SINK_UNLOCK (self);
407 gst_wasapi2_sink_write (GstAudioSink * asink, gpointer data, guint length)
409 GstWasapi2Sink *self = GST_WASAPI2_SINK (asink);
412 GST_ERROR_OBJECT (self, "No audio client was configured");
416 if (!self->started) {
417 if (!gst_wasapi2_client_start (self->client)) {
418 GST_ERROR_OBJECT (self, "Failed to re-start client");
422 self->started = TRUE;
425 return gst_wasapi2_client_write (self->client, data, length);
429 gst_wasapi2_sink_delay (GstAudioSink * asink)
431 GstWasapi2Sink *self = GST_WASAPI2_SINK (asink);
436 return gst_wasapi2_client_delay (self->client);
440 gst_wasapi2_sink_reset (GstAudioSink * asink)
442 GstWasapi2Sink *self = GST_WASAPI2_SINK (asink);
444 GST_INFO_OBJECT (self, "reset called");
446 self->started = FALSE;
451 gst_wasapi2_client_stop (self->client);
455 gst_wasapi2_sink_set_mute (GstWasapi2Sink * self, gboolean mute)
457 GST_WASAPI2_SINK_LOCK (self);
460 self->mute_changed = TRUE;
463 if (!gst_wasapi2_client_set_mute (self->client, mute)) {
464 GST_INFO_OBJECT (self, "Couldn't set mute");
466 self->mute_changed = FALSE;
469 GST_DEBUG_OBJECT (self, "audio client is not configured yet");
472 GST_WASAPI2_SINK_UNLOCK (self);
476 gst_wasapi2_sink_get_mute (GstWasapi2Sink * self)
480 GST_WASAPI2_SINK_LOCK (self);
485 if (!gst_wasapi2_client_get_mute (self->client, &mute)) {
486 GST_INFO_OBJECT (self, "Couldn't get mute state");
491 GST_DEBUG_OBJECT (self, "audio client is not configured yet");
494 GST_WASAPI2_SINK_UNLOCK (self);
500 gst_wasapi2_sink_set_volume (GstWasapi2Sink * self, gdouble volume)
502 GST_WASAPI2_SINK_LOCK (self);
504 self->volume = volume;
505 /* clip volume value */
506 self->volume = MAX (0.0, self->volume);
507 self->volume = MIN (1.0, self->volume);
508 self->volume_changed = TRUE;
511 if (!gst_wasapi2_client_set_volume (self->client, (gfloat) self->volume)) {
512 GST_INFO_OBJECT (self, "Couldn't set volume");
514 self->volume_changed = FALSE;
517 GST_DEBUG_OBJECT (self, "audio client is not configured yet");
520 GST_WASAPI2_SINK_UNLOCK (self);
524 gst_wasapi2_sink_get_volume (GstWasapi2Sink * self)
528 GST_WASAPI2_SINK_LOCK (self);
530 volume = (gfloat) self->volume;
533 if (!gst_wasapi2_client_get_volume (self->client, &volume)) {
534 GST_INFO_OBJECT (self, "Couldn't get volume");
536 self->volume = volume;
539 GST_DEBUG_OBJECT (self, "audio client is not configured yet");
542 GST_WASAPI2_SINK_UNLOCK (self);
544 volume = MAX (0.0, volume);
545 volume = MIN (1.0, volume);