2 * Copyright (C) 2009 Igalia S.L.
3 * Author: Iago Toral Quiroga <itoral@igalia.com>
4 * Copyright (C) 2011 Mark Nauwelaerts <mark.nauwelaerts@collabora.co.uk>.
5 * Copyright (C) 2011 Nokia Corporation. All rights reserved.
6 * Contact: Stefan Kost <stefan.kost@nokia.com>
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
23 #ifndef _GST_AUDIO_DECODER_H_
24 #define _GST_AUDIO_DECODER_H_
27 #include <gst/audio/audio.h>
28 #include <gst/base/gstadapter.h>
32 #define GST_TYPE_AUDIO_DECODER \
33 (gst_audio_decoder_get_type())
34 #define GST_AUDIO_DECODER(obj) \
35 (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_DECODER,GstAudioDecoder))
36 #define GST_AUDIO_DECODER_CLASS(klass) \
37 (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_AUDIO_DECODER,GstAudioDecoderClass))
38 #define GST_AUDIO_DECODER_GET_CLASS(obj) \
39 (G_TYPE_INSTANCE_GET_CLASS((obj),GST_TYPE_AUDIO_DECODER,GstAudioDecoderClass))
40 #define GST_IS_AUDIO_DECODER(obj) \
41 (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_DECODER))
42 #define GST_IS_AUDIO_DECODER_CLASS(obj) \
43 (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AUDIO_DECODER))
46 * GST_AUDIO_DECODER_SINK_NAME:
48 * The name of the templates for the sink pad.
52 #define GST_AUDIO_DECODER_SINK_NAME "sink"
54 * GST_AUDIO_DECODER_SRC_NAME:
56 * The name of the templates for the source pad.
60 #define GST_AUDIO_DECODER_SRC_NAME "src"
63 * GST_AUDIO_DECODER_SRC_PAD:
64 * @obj: base audio codec instance
66 * Gives the pointer to the source #GstPad object of the element.
70 #define GST_AUDIO_DECODER_SRC_PAD(obj) (((GstAudioDecoder *) (obj))->srcpad)
73 * GST_AUDIO_DECODER_SINK_PAD:
74 * @obj: base audio codec instance
76 * Gives the pointer to the sink #GstPad object of the element.
80 #define GST_AUDIO_DECODER_SINK_PAD(obj) (((GstAudioDecoder *) (obj))->sinkpad)
82 #define GST_AUDIO_DECODER_STREAM_LOCK(dec) g_static_rec_mutex_lock (&GST_AUDIO_DECODER (dec)->stream_lock)
83 #define GST_AUDIO_DECODER_STREAM_UNLOCK(dec) g_static_rec_mutex_unlock (&GST_AUDIO_DECODER (dec)->stream_lock)
85 typedef struct _GstAudioDecoder GstAudioDecoder;
86 typedef struct _GstAudioDecoderClass GstAudioDecoderClass;
88 typedef struct _GstAudioDecoderPrivate GstAudioDecoderPrivate;
90 /* do not use this one, use macro below */
91 GstFlowReturn _gst_audio_decoder_error (GstAudioDecoder *dec, gint weight,
92 GQuark domain, gint code,
93 gchar *txt, gchar *debug,
94 const gchar *file, const gchar *function,
98 * GST_AUDIO_DECODER_ERROR:
99 * @el: the base audio decoder element that generates the error
100 * @weight: element defined weight of the error, added to error count
101 * @domain: like CORE, LIBRARY, RESOURCE or STREAM (see #gstreamer-GstGError)
102 * @code: error code defined for that domain (see #gstreamer-GstGError)
103 * @text: the message to display (format string and args enclosed in
105 * @debug: debugging information for the message (format string and args
106 * enclosed in parentheses)
107 * @ret: variable to receive return value
109 * Utility function that audio decoder elements can use in case they encountered
110 * a data processing error that may be fatal for the current "data unit" but
111 * need not prevent subsequent decoding. Such errors are counted and if there
112 * are too many, as configured in the context's max_errors, the pipeline will
113 * post an error message and the application will be requested to stop further
114 * media processing. Otherwise, it is considered a "glitch" and only a warning
115 * is logged. In either case, @ret is set to the proper value to
116 * return to upstream/caller (indicating either GST_FLOW_ERROR or GST_FLOW_OK).
120 #define GST_AUDIO_DECODER_ERROR(el, weight, domain, code, text, debug, ret) \
122 gchar *__txt = _gst_element_error_printf text; \
123 gchar *__dbg = _gst_element_error_printf debug; \
124 GstAudioDecoder *dec = GST_AUDIO_DECODER (el); \
125 ret = _gst_audio_decoder_error (dec, weight, GST_ ## domain ## _ERROR, \
126 GST_ ## domain ## _ERROR_ ## code, __txt, __dbg, __FILE__, \
127 GST_FUNCTION, __LINE__); \
133 * The opaque #GstAudioDecoder data structure.
137 struct _GstAudioDecoder
142 /* source and sink pads */
146 /* protects all data processing, i.e. is locked
147 * in the chain function, finish_frame and when
148 * processing serialized events */
149 GStaticRecMutex stream_lock;
151 /* MT-protected (with STREAM_LOCK) */
155 GstAudioDecoderPrivate *priv;
157 gpointer _gst_reserved[GST_PADDING_LARGE];
161 * GstAudioDecoderClass:
162 * @element_class: The parent class structure
164 * Called when the element starts processing.
165 * Allows opening external resources.
167 * Called when the element stops processing.
168 * Allows closing external resources.
169 * @set_format: Notifies subclass of incoming data format (caps).
171 * Allows chopping incoming data into manageable units (frames)
172 * for subsequent decoding. This division is at subclass
173 * discretion and may or may not correspond to 1 (or more)
174 * frames as defined by audio format.
175 * @handle_frame: Provides input data (or NULL to clear any remaining data)
176 * to subclass. Input data ref management is performed by
177 * base class, subclass should not care or intervene.
179 * Instructs subclass to clear any codec caches and discard
180 * any pending samples and not yet returned encoded data.
181 * @hard indicates whether a FLUSH is being processed,
182 * or otherwise a DISCONT (or conceptually similar).
184 * Event handler on the sink pad. This function should return
185 * TRUE if the event was handled and should be discarded
186 * (i.e. not unref'ed).
187 * @pre_push: Optional.
188 * Called just prior to pushing (encoded data) buffer downstream.
189 * Subclass has full discretionary access to buffer,
190 * and a not OK flow return will abort downstream pushing.
192 * Subclasses can override any of the available virtual methods or not, as
193 * needed. At minimum @handle_frame (and likely @set_format) needs to be
198 struct _GstAudioDecoderClass
200 GstElementClass element_class;
203 /* virtual methods for subclasses */
205 gboolean (*start) (GstAudioDecoder *dec);
207 gboolean (*stop) (GstAudioDecoder *dec);
209 gboolean (*set_format) (GstAudioDecoder *dec,
212 GstFlowReturn (*parse) (GstAudioDecoder *dec,
214 gint *offset, gint *length);
216 GstFlowReturn (*handle_frame) (GstAudioDecoder *dec,
219 void (*flush) (GstAudioDecoder *dec, gboolean hard);
221 GstFlowReturn (*pre_push) (GstAudioDecoder *dec,
224 gboolean (*event) (GstAudioDecoder *dec,
228 gpointer _gst_reserved[GST_PADDING_LARGE];
231 GType gst_audio_decoder_get_type (void);
233 gboolean gst_audio_decoder_set_outcaps (GstAudioDecoder * dec,
236 GstFlowReturn gst_audio_decoder_finish_frame (GstAudioDecoder * dec,
237 GstBuffer * buf, gint frames);
239 /* context parameters */
240 GstAudioInfo * gst_audio_decoder_get_audio_info (GstAudioDecoder * dec);
242 void gst_audio_decoder_set_plc_aware (GstAudioDecoder * dec,
245 gint gst_audio_decoder_get_plc_aware (GstAudioDecoder * dec);
247 void gst_audio_decoder_set_byte_time (GstAudioDecoder * dec,
250 gint gst_audio_decoder_get_byte_time (GstAudioDecoder * dec);
252 gint gst_audio_decoder_get_delay (GstAudioDecoder * dec);
254 void gst_audio_decoder_set_max_errors (GstAudioDecoder * dec,
257 gint gst_audio_decoder_get_max_errors (GstAudioDecoder * dec);
259 void gst_audio_decoder_set_latency (GstAudioDecoder * dec,
263 void gst_audio_decoder_get_latency (GstAudioDecoder * dec,
267 void gst_audio_decoder_get_parse_state (GstAudioDecoder * dec,
272 /* object properties */
273 void gst_audio_decoder_set_plc (GstAudioDecoder * dec,
276 gboolean gst_audio_decoder_get_plc (GstAudioDecoder * dec);
278 void gst_audio_decoder_set_min_latency (GstAudioDecoder * dec,
281 gint64 gst_audio_decoder_get_min_latency (GstAudioDecoder * dec);
283 void gst_audio_decoder_set_tolerance (GstAudioDecoder * dec,
286 gint64 gst_audio_decoder_get_tolerance (GstAudioDecoder * dec);
290 #endif /* _GST_AUDIO_DECODER_H_ */