2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2005 Wim Taymans <wim@fluendo.com>
5 * gstaudiosrc.c: simple audio src base class
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
25 * @short_description: Simple base class for audio sources
26 * @see_also: #GstBaseAudioSrc, #GstRingBuffer, #GstAudioSrc.
28 * This is the most simple base class for audio sources that only requires
29 * subclasses to implement a set of simple functions:
34 * <listitem><para>Open the device.</para></listitem>
37 * <term>prepare()</term>
38 * <listitem><para>Configure the device with the specified format.</para></listitem>
42 * <listitem><para>Read samples from the device.</para></listitem>
45 * <term>reset()</term>
46 * <listitem><para>Unblock reads and flush the device.</para></listitem>
49 * <term>delay()</term>
50 * <listitem><para>Get the number of samples in the device but not yet read.
54 * <term>unprepare()</term>
55 * <listitem><para>Undo operations done by prepare.</para></listitem>
58 * <term>close()</term>
59 * <listitem><para>Close the device.</para></listitem>
63 * All scheduling of samples and timestamps is done in this base class
64 * together with #GstBaseAudioSrc using a default implementation of a
65 * #GstRingBuffer that uses threads.
67 * Last reviewed on 2006-09-27 (0.10.12)
72 #include "gstaudiosrc.h"
74 GST_DEBUG_CATEGORY_STATIC (gst_audio_src_debug);
75 #define GST_CAT_DEFAULT gst_audio_src_debug
77 #define GST_TYPE_AUDIO_SRC_RING_BUFFER \
78 (gst_audio_src_ring_buffer_get_type())
79 #define GST_AUDIO_SRC_RING_BUFFER(obj) \
80 (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_SRC_RING_BUFFER,GstAudioSrcRingBuffer))
81 #define GST_AUDIO_SRC_RING_BUFFER_CLASS(klass) \
82 (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_AUDIO_SRC_RING_BUFFER,GstAudioSrcRingBufferClass))
83 #define GST_AUDIO_SRC_RING_BUFFER_GET_CLASS(obj) \
84 (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_AUDIO_SRC_RING_BUFFER, GstAudioSrcRingBufferClass))
85 #define GST_IS_AUDIO_SRC_RING_BUFFER(obj) \
86 (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_SRC_RING_BUFFER))
87 #define GST_IS_AUDIO_SRC_RING_BUFFER_CLASS(klass)\
88 (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AUDIO_SRC_RING_BUFFER))
90 typedef struct _GstAudioSrcRingBuffer GstAudioSrcRingBuffer;
91 typedef struct _GstAudioSrcRingBufferClass GstAudioSrcRingBufferClass;
93 #define GST_AUDIO_SRC_RING_BUFFER_GET_COND(buf) (((GstAudioSrcRingBuffer *)buf)->cond)
94 #define GST_AUDIO_SRC_RING_BUFFER_WAIT(buf) (g_cond_wait (GST_AUDIO_SRC_RING_BUFFER_GET_COND (buf), GST_OBJECT_GET_LOCK (buf)))
95 #define GST_AUDIO_SRC_RING_BUFFER_SIGNAL(buf) (g_cond_signal (GST_AUDIO_SRC_RING_BUFFER_GET_COND (buf)))
96 #define GST_AUDIO_SRC_RING_BUFFER_BROADCAST(buf)(g_cond_broadcast (GST_AUDIO_SRC_RING_BUFFER_GET_COND (buf)))
98 struct _GstAudioSrcRingBuffer
100 GstRingBuffer object;
108 struct _GstAudioSrcRingBufferClass
110 GstRingBufferClass parent_class;
113 static void gst_audio_src_ring_buffer_class_init (GstAudioSrcRingBufferClass *
115 static void gst_audio_src_ring_buffer_init (GstAudioSrcRingBuffer * ringbuffer,
116 GstAudioSrcRingBufferClass * klass);
117 static void gst_audio_src_ring_buffer_dispose (GObject * object);
118 static void gst_audio_src_ring_buffer_finalize (GObject * object);
120 static GstRingBufferClass *ring_parent_class = NULL;
122 static gboolean gst_audio_src_ring_buffer_open_device (GstRingBuffer * buf);
123 static gboolean gst_audio_src_ring_buffer_close_device (GstRingBuffer * buf);
124 static gboolean gst_audio_src_ring_buffer_acquire (GstRingBuffer * buf,
125 GstRingBufferSpec * spec);
126 static gboolean gst_audio_src_ring_buffer_release (GstRingBuffer * buf);
127 static gboolean gst_audio_src_ring_buffer_start (GstRingBuffer * buf);
128 static gboolean gst_audio_src_ring_buffer_stop (GstRingBuffer * buf);
129 static guint gst_audio_src_ring_buffer_delay (GstRingBuffer * buf);
131 /* ringbuffer abstract base class */
133 gst_audio_src_ring_buffer_get_type (void)
135 static GType ringbuffer_type = 0;
137 if (!ringbuffer_type) {
138 static const GTypeInfo ringbuffer_info = {
139 sizeof (GstAudioSrcRingBufferClass),
142 (GClassInitFunc) gst_audio_src_ring_buffer_class_init,
145 sizeof (GstAudioSrcRingBuffer),
147 (GInstanceInitFunc) gst_audio_src_ring_buffer_init,
152 g_type_register_static (GST_TYPE_RING_BUFFER, "GstAudioSrcRingBuffer",
153 &ringbuffer_info, 0);
155 return ringbuffer_type;
159 gst_audio_src_ring_buffer_class_init (GstAudioSrcRingBufferClass * klass)
161 GObjectClass *gobject_class;
162 GstRingBufferClass *gstringbuffer_class;
164 gobject_class = (GObjectClass *) klass;
165 gstringbuffer_class = (GstRingBufferClass *) klass;
167 ring_parent_class = g_type_class_peek_parent (klass);
169 gobject_class->dispose = gst_audio_src_ring_buffer_dispose;
170 gobject_class->finalize = gst_audio_src_ring_buffer_finalize;
172 gstringbuffer_class->open_device =
173 GST_DEBUG_FUNCPTR (gst_audio_src_ring_buffer_open_device);
174 gstringbuffer_class->close_device =
175 GST_DEBUG_FUNCPTR (gst_audio_src_ring_buffer_close_device);
176 gstringbuffer_class->acquire =
177 GST_DEBUG_FUNCPTR (gst_audio_src_ring_buffer_acquire);
178 gstringbuffer_class->release =
179 GST_DEBUG_FUNCPTR (gst_audio_src_ring_buffer_release);
180 gstringbuffer_class->start =
181 GST_DEBUG_FUNCPTR (gst_audio_src_ring_buffer_start);
182 gstringbuffer_class->resume =
183 GST_DEBUG_FUNCPTR (gst_audio_src_ring_buffer_start);
184 gstringbuffer_class->stop =
185 GST_DEBUG_FUNCPTR (gst_audio_src_ring_buffer_stop);
187 gstringbuffer_class->delay =
188 GST_DEBUG_FUNCPTR (gst_audio_src_ring_buffer_delay);
191 typedef guint (*ReadFunc) (GstAudioSrc * src, gpointer data, guint length);
193 /* this internal thread does nothing else but read samples from the audio device.
194 * It will read each segment in the ringbuffer and will update the play
196 * The start/stop methods control the thread.
199 audioringbuffer_thread_func (GstRingBuffer * buf)
202 GstAudioSrcClass *csrc;
203 GstAudioSrcRingBuffer *abuf = GST_AUDIO_SRC_RING_BUFFER (buf);
208 src = GST_AUDIO_SRC (GST_OBJECT_PARENT (buf));
209 csrc = GST_AUDIO_SRC_GET_CLASS (src);
211 GST_DEBUG_OBJECT (src, "enter thread");
213 readfunc = csrc->read;
214 if (readfunc == NULL)
217 /* FIXME: maybe we should at least use a custom pointer type here? */
218 g_value_init (&val, G_TYPE_POINTER);
219 g_value_set_pointer (&val, src->thread);
220 message = gst_message_new_stream_status (GST_OBJECT_CAST (buf),
221 GST_STREAM_STATUS_TYPE_ENTER, GST_ELEMENT_CAST (src));
222 gst_message_set_stream_status_object (message, &val);
223 GST_DEBUG_OBJECT (src, "posting ENTER stream status");
224 gst_element_post_message (GST_ELEMENT_CAST (src), message);
231 if (gst_ring_buffer_prepare_read (buf, &readseg, &readptr, &len)) {
236 read = readfunc (src, readptr, left);
237 GST_LOG_OBJECT (src, "transfered %d bytes of %d to segment %d", read,
239 if (read < 0 || read > left) {
240 GST_WARNING_OBJECT (src,
241 "error reading data %d (reason: %s), skipping segment", read,
249 /* we read one segment */
250 gst_ring_buffer_advance (buf, 1);
252 GST_OBJECT_LOCK (abuf);
255 if (G_UNLIKELY (g_atomic_int_get (&buf->state) ==
256 GST_RING_BUFFER_STATE_STARTED)) {
257 GST_OBJECT_UNLOCK (abuf);
260 GST_DEBUG_OBJECT (src, "signal wait");
261 GST_AUDIO_SRC_RING_BUFFER_SIGNAL (buf);
262 GST_DEBUG_OBJECT (src, "wait for action");
263 GST_AUDIO_SRC_RING_BUFFER_WAIT (buf);
264 GST_DEBUG_OBJECT (src, "got signal");
267 GST_DEBUG_OBJECT (src, "continue running");
268 GST_OBJECT_UNLOCK (abuf);
272 /* Will never be reached */
273 g_assert_not_reached ();
279 GST_DEBUG ("no write function, exit thread");
284 GST_OBJECT_UNLOCK (abuf);
285 GST_DEBUG ("stop running, exit thread");
286 message = gst_message_new_stream_status (GST_OBJECT_CAST (buf),
287 GST_STREAM_STATUS_TYPE_LEAVE, GST_ELEMENT_CAST (src));
288 gst_message_set_stream_status_object (message, &val);
289 GST_DEBUG_OBJECT (src, "posting LEAVE stream status");
290 gst_element_post_message (GST_ELEMENT_CAST (src), message);
296 gst_audio_src_ring_buffer_init (GstAudioSrcRingBuffer * ringbuffer,
297 GstAudioSrcRingBufferClass * g_class)
299 ringbuffer->running = FALSE;
300 ringbuffer->queuedseg = 0;
302 ringbuffer->cond = g_cond_new ();
306 gst_audio_src_ring_buffer_dispose (GObject * object)
308 GstAudioSrcRingBuffer *ringbuffer = GST_AUDIO_SRC_RING_BUFFER (object);
310 if (ringbuffer->cond) {
311 g_cond_free (ringbuffer->cond);
312 ringbuffer->cond = NULL;
315 G_OBJECT_CLASS (ring_parent_class)->dispose (object);
319 gst_audio_src_ring_buffer_finalize (GObject * object)
321 G_OBJECT_CLASS (ring_parent_class)->finalize (object);
325 gst_audio_src_ring_buffer_open_device (GstRingBuffer * buf)
328 GstAudioSrcClass *csrc;
329 gboolean result = TRUE;
331 src = GST_AUDIO_SRC (GST_OBJECT_PARENT (buf));
332 csrc = GST_AUDIO_SRC_GET_CLASS (src);
335 result = csrc->open (src);
349 gst_audio_src_ring_buffer_close_device (GstRingBuffer * buf)
352 GstAudioSrcClass *csrc;
353 gboolean result = TRUE;
355 src = GST_AUDIO_SRC (GST_OBJECT_PARENT (buf));
356 csrc = GST_AUDIO_SRC_GET_CLASS (src);
359 result = csrc->close (src);
373 gst_audio_src_ring_buffer_acquire (GstRingBuffer * buf,
374 GstRingBufferSpec * spec)
377 GstAudioSrcClass *csrc;
378 GstAudioSrcRingBuffer *abuf;
379 gboolean result = FALSE;
381 src = GST_AUDIO_SRC (GST_OBJECT_PARENT (buf));
382 csrc = GST_AUDIO_SRC_GET_CLASS (src);
385 result = csrc->prepare (src, spec);
390 buf->size = spec->segtotal * spec->segsize;
391 buf->memory = g_malloc0 (buf->size);
393 abuf = GST_AUDIO_SRC_RING_BUFFER (buf);
394 abuf->running = TRUE;
397 g_thread_create ((GThreadFunc) audioringbuffer_thread_func, buf, TRUE,
399 GST_AUDIO_SRC_RING_BUFFER_WAIT (buf);
409 /* function is called with LOCK */
411 gst_audio_src_ring_buffer_release (GstRingBuffer * buf)
414 GstAudioSrcClass *csrc;
415 GstAudioSrcRingBuffer *abuf;
416 gboolean result = FALSE;
418 src = GST_AUDIO_SRC (GST_OBJECT_PARENT (buf));
419 csrc = GST_AUDIO_SRC_GET_CLASS (src);
420 abuf = GST_AUDIO_SRC_RING_BUFFER (buf);
422 abuf->running = FALSE;
423 GST_AUDIO_SRC_RING_BUFFER_SIGNAL (buf);
424 GST_OBJECT_UNLOCK (buf);
426 /* join the thread */
427 g_thread_join (src->thread);
429 GST_OBJECT_LOCK (buf);
431 /* free the buffer */
432 g_free (buf->memory);
436 result = csrc->unprepare (src);
442 gst_audio_src_ring_buffer_start (GstRingBuffer * buf)
444 GST_DEBUG ("start, sending signal");
445 GST_AUDIO_SRC_RING_BUFFER_SIGNAL (buf);
451 gst_audio_src_ring_buffer_stop (GstRingBuffer * buf)
454 GstAudioSrcClass *csrc;
456 src = GST_AUDIO_SRC (GST_OBJECT_PARENT (buf));
457 csrc = GST_AUDIO_SRC_GET_CLASS (src);
459 /* unblock any pending writes to the audio device */
461 GST_DEBUG ("reset...");
463 GST_DEBUG ("reset done");
466 GST_DEBUG ("stop, waiting...");
467 GST_AUDIO_SRC_RING_BUFFER_WAIT (buf);
468 GST_DEBUG ("stoped");
475 gst_audio_src_ring_buffer_delay (GstRingBuffer * buf)
478 GstAudioSrcClass *csrc;
481 src = GST_AUDIO_SRC (GST_OBJECT_PARENT (buf));
482 csrc = GST_AUDIO_SRC_GET_CLASS (src);
485 res = csrc->delay (src);
490 /* AudioSrc signals and args */
503 GST_DEBUG_CATEGORY_INIT (gst_audio_src_debug, "audiosrc", 0, "audiosrc element");
504 #define gst_audio_src_parent_class parent_class
505 G_DEFINE_TYPE_WITH_CODE (GstAudioSrc, gst_audio_src,
506 GST_TYPE_BASE_AUDIO_SRC, _do_init);
508 static GstRingBuffer *gst_audio_src_create_ringbuffer (GstBaseAudioSrc * src);
511 gst_audio_src_class_init (GstAudioSrcClass * klass)
513 GstBaseAudioSrcClass *gstbaseaudiosrc_class;
515 gstbaseaudiosrc_class = (GstBaseAudioSrcClass *) klass;
517 gstbaseaudiosrc_class->create_ringbuffer =
518 GST_DEBUG_FUNCPTR (gst_audio_src_create_ringbuffer);
520 g_type_class_ref (GST_TYPE_AUDIO_SRC_RING_BUFFER);
524 gst_audio_src_init (GstAudioSrc * audiosrc)
528 static GstRingBuffer *
529 gst_audio_src_create_ringbuffer (GstBaseAudioSrc * src)
531 GstRingBuffer *buffer;
533 GST_DEBUG ("creating ringbuffer");
534 buffer = g_object_new (GST_TYPE_AUDIO_SRC_RING_BUFFER, NULL);
535 GST_DEBUG ("created ringbuffer @%p", buffer);