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))
44 #define GST_AUDIO_DECODER_CAST(obj) \
45 ((GstAudioDecoder *)(obj))
48 * GST_AUDIO_DECODER_SINK_NAME:
50 * The name of the templates for the sink pad.
54 #define GST_AUDIO_DECODER_SINK_NAME "sink"
56 * GST_AUDIO_DECODER_SRC_NAME:
58 * The name of the templates for the source pad.
62 #define GST_AUDIO_DECODER_SRC_NAME "src"
65 * GST_AUDIO_DECODER_SRC_PAD:
66 * @obj: base audio codec instance
68 * Gives the pointer to the source #GstPad object of the element.
72 #define GST_AUDIO_DECODER_SRC_PAD(obj) (((GstAudioDecoder *) (obj))->srcpad)
75 * GST_AUDIO_DECODER_SINK_PAD:
76 * @obj: base audio codec instance
78 * Gives the pointer to the sink #GstPad object of the element.
82 #define GST_AUDIO_DECODER_SINK_PAD(obj) (((GstAudioDecoder *) (obj))->sinkpad)
84 #define GST_AUDIO_DECODER_STREAM_LOCK(dec) g_rec_mutex_lock (&GST_AUDIO_DECODER (dec)->stream_lock)
85 #define GST_AUDIO_DECODER_STREAM_UNLOCK(dec) g_rec_mutex_unlock (&GST_AUDIO_DECODER (dec)->stream_lock)
87 typedef struct _GstAudioDecoder GstAudioDecoder;
88 typedef struct _GstAudioDecoderClass GstAudioDecoderClass;
90 typedef struct _GstAudioDecoderPrivate GstAudioDecoderPrivate;
92 /* do not use this one, use macro below */
93 GstFlowReturn _gst_audio_decoder_error (GstAudioDecoder *dec, gint weight,
94 GQuark domain, gint code,
95 gchar *txt, gchar *debug,
96 const gchar *file, const gchar *function,
100 * GST_AUDIO_DECODER_ERROR:
101 * @el: the base audio decoder element that generates the error
102 * @weight: element defined weight of the error, added to error count
103 * @domain: like CORE, LIBRARY, RESOURCE or STREAM (see #gstreamer-GstGError)
104 * @code: error code defined for that domain (see #gstreamer-GstGError)
105 * @text: the message to display (format string and args enclosed in
107 * @debug: debugging information for the message (format string and args
108 * enclosed in parentheses)
109 * @ret: variable to receive return value
111 * Utility function that audio decoder elements can use in case they encountered
112 * a data processing error that may be fatal for the current "data unit" but
113 * need not prevent subsequent decoding. Such errors are counted and if there
114 * are too many, as configured in the context's max_errors, the pipeline will
115 * post an error message and the application will be requested to stop further
116 * media processing. Otherwise, it is considered a "glitch" and only a warning
117 * is logged. In either case, @ret is set to the proper value to
118 * return to upstream/caller (indicating either GST_FLOW_ERROR or GST_FLOW_OK).
122 #define GST_AUDIO_DECODER_ERROR(el, weight, domain, code, text, debug, ret) \
124 gchar *__txt = _gst_element_error_printf text; \
125 gchar *__dbg = _gst_element_error_printf debug; \
126 GstAudioDecoder *dec = GST_AUDIO_DECODER (el); \
127 ret = _gst_audio_decoder_error (dec, weight, GST_ ## domain ## _ERROR, \
128 GST_ ## domain ## _ERROR_ ## code, __txt, __dbg, __FILE__, \
129 GST_FUNCTION, __LINE__); \
134 * GST_AUDIO_DECODER_MAX_ERRORS:
136 * Default maximum number of errors tolerated before signaling error.
140 #define GST_AUDIO_DECODER_MAX_ERRORS 10
145 * The opaque #GstAudioDecoder data structure.
149 struct _GstAudioDecoder
154 /* source and sink pads */
158 /* protects all data processing, i.e. is locked
159 * in the chain function, finish_frame and when
160 * processing serialized events */
161 GRecMutex stream_lock;
163 /* MT-protected (with STREAM_LOCK) */
167 GstAudioDecoderPrivate *priv;
169 gpointer _gst_reserved[GST_PADDING_LARGE];
173 * GstAudioDecoderClass:
174 * @element_class: The parent class structure
176 * Called when the element starts processing.
177 * Allows opening external resources.
179 * Called when the element stops processing.
180 * Allows closing external resources.
181 * @set_format: Notifies subclass of incoming data format (caps).
183 * Allows chopping incoming data into manageable units (frames)
184 * for subsequent decoding. This division is at subclass
185 * discretion and may or may not correspond to 1 (or more)
186 * frames as defined by audio format.
187 * @handle_frame: Provides input data (or NULL to clear any remaining data)
188 * to subclass. Input data ref management is performed by
189 * base class, subclass should not care or intervene,
190 * and input data is only valid until next call to base class,
191 * most notably a call to gst_audio_decoder_finish_frame().
193 * Instructs subclass to clear any codec caches and discard
194 * any pending samples and not yet returned decoded data.
195 * @hard indicates whether a FLUSH is being processed,
196 * or otherwise a DISCONT (or conceptually similar).
198 * Event handler on the sink pad. Subclasses should chain up to
199 * the parent implementation to invoke the default handler.
200 * @pre_push: Optional.
201 * Called just prior to pushing (encoded data) buffer downstream.
202 * Subclass has full discretionary access to buffer,
203 * and a not OK flow return will abort downstream pushing.
205 * Called when the element changes to GST_STATE_READY.
206 * Allows opening external resources. Since: 0.10.37.
208 * Called when the element changes to GST_STATE_NULL.
209 * Allows closing external resources. Since: 0.10.37.
211 * Subclasses can override any of the available virtual methods or not, as
212 * needed. At minimum @handle_frame (and likely @set_format) needs to be
217 struct _GstAudioDecoderClass
219 GstElementClass element_class;
222 /* virtual methods for subclasses */
224 gboolean (*start) (GstAudioDecoder *dec);
226 gboolean (*stop) (GstAudioDecoder *dec);
228 gboolean (*set_format) (GstAudioDecoder *dec,
231 GstFlowReturn (*parse) (GstAudioDecoder *dec,
233 gint *offset, gint *length);
235 GstFlowReturn (*handle_frame) (GstAudioDecoder *dec,
238 void (*flush) (GstAudioDecoder *dec, gboolean hard);
240 GstFlowReturn (*pre_push) (GstAudioDecoder *dec,
243 gboolean (*event) (GstAudioDecoder *dec,
246 gboolean (*open) (GstAudioDecoder *dec);
248 gboolean (*close) (GstAudioDecoder *dec);
251 gpointer _gst_reserved[GST_PADDING_LARGE-2];
254 GType gst_audio_decoder_get_type (void);
256 gboolean gst_audio_decoder_set_output_format (GstAudioDecoder * dec,
257 const GstAudioInfo * info);
259 GstFlowReturn gst_audio_decoder_finish_frame (GstAudioDecoder * dec,
260 GstBuffer * buf, gint frames);
262 /* context parameters */
263 GstAudioInfo * gst_audio_decoder_get_audio_info (GstAudioDecoder * dec);
265 void gst_audio_decoder_set_plc_aware (GstAudioDecoder * dec,
268 gint gst_audio_decoder_get_plc_aware (GstAudioDecoder * dec);
270 void gst_audio_decoder_set_byte_time (GstAudioDecoder * dec,
273 gint gst_audio_decoder_get_byte_time (GstAudioDecoder * dec);
275 gint gst_audio_decoder_get_delay (GstAudioDecoder * dec);
277 void gst_audio_decoder_set_max_errors (GstAudioDecoder * dec,
280 gint gst_audio_decoder_get_max_errors (GstAudioDecoder * dec);
282 void gst_audio_decoder_set_latency (GstAudioDecoder * dec,
286 void gst_audio_decoder_get_latency (GstAudioDecoder * dec,
290 void gst_audio_decoder_get_parse_state (GstAudioDecoder * dec,
295 /* object properties */
296 void gst_audio_decoder_set_plc (GstAudioDecoder * dec,
299 gboolean gst_audio_decoder_get_plc (GstAudioDecoder * dec);
301 void gst_audio_decoder_set_min_latency (GstAudioDecoder * dec,
304 gint64 gst_audio_decoder_get_min_latency (GstAudioDecoder * dec);
306 void gst_audio_decoder_set_tolerance (GstAudioDecoder * dec,
309 gint64 gst_audio_decoder_get_tolerance (GstAudioDecoder * dec);
311 void gst_audio_decoder_set_drainable (GstAudioDecoder * dec,
314 gboolean gst_audio_decoder_get_drainable (GstAudioDecoder * dec);
316 void gst_audio_decoder_set_needs_format (GstAudioDecoder * dec,
319 gboolean gst_audio_decoder_get_needs_format (GstAudioDecoder * dec);
321 void gst_audio_decoder_merge_tags (GstAudioDecoder * dec,
322 const GstTagList * tags, GstTagMergeMode mode);
326 #endif /* _GST_AUDIO_DECODER_H_ */