2 * Copyright (C) 2008 Nokia Corporation. All rights reserved.
4 * Contact: Stefan Kost <stefan.kost@nokia.com>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, USA.
22 #ifndef __GST_BASE_PARSE_H__
23 #define __GST_BASE_PARSE_H__
29 #define GST_TYPE_BASE_PARSE (gst_base_parse_get_type())
30 #define GST_BASE_PARSE(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BASE_PARSE,GstBaseParse))
31 #define GST_BASE_PARSE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_BASE_PARSE,GstBaseParseClass))
32 #define GST_BASE_PARSE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj),GST_TYPE_BASE_PARSE,GstBaseParseClass))
33 #define GST_IS_BASE_PARSE(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BASE_PARSE))
34 #define GST_IS_BASE_PARSE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BASE_PARSE))
35 #define GST_BASE_PARSE_CAST(obj) ((GstBaseParse *)(obj))
38 * GST_BASE_PARSE_SRC_PAD:
39 * @obj: base parse instance
41 * Gives the pointer to the source #GstPad object of the element.
45 #define GST_BASE_PARSE_SRC_PAD(obj) (GST_BASE_PARSE_CAST (obj)->srcpad)
48 * GST_BASE_PARSE_SINK_PAD:
49 * @obj: base parse instance
51 * Gives the pointer to the sink #GstPad object of the element.
55 #define GST_BASE_PARSE_SINK_PAD(obj) (GST_BASE_PARSE_CAST (obj)->sinkpad)
58 * GST_BASE_PARSE_FLOW_DROPPED:
60 * A #GstFlowReturn that can be returned from parse_frame to
61 * indicate that no output buffer was generated, or from pre_push_frame to
62 * to forego pushing buffer.
66 #define GST_BASE_PARSE_FLOW_DROPPED GST_FLOW_CUSTOM_SUCCESS
68 /* not public API, use accessor macros below */
69 #define GST_BASE_PARSE_FLAG_LOST_SYNC (1 << 0)
70 #define GST_BASE_PARSE_FLAG_DRAINING (1 << 1)
73 * GST_BASE_PARSE_LOST_SYNC:
74 * @parse: base parse instance
76 * Obtains current sync status.
80 #define GST_BASE_PARSE_LOST_SYNC(parse) (!!(GST_BASE_PARSE_CAST(parse)->flags & GST_BASE_PARSE_FLAG_LOST_SYNC))
83 * GST_BASE_PARSE_DRAINING:
84 * @parse: base parse instance
86 * Obtains current drain status (ie. whether EOS has been received and
87 * the parser is now processing the frames at the end of the stream)
91 #define GST_BASE_PARSE_DRAINING(parse) (!!(GST_BASE_PARSE_CAST(parse)->flags & GST_BASE_PARSE_FLAG_DRAINING))
94 * GstBaseParseFrameFlags:
95 * @GST_BASE_PARSE_FRAME_FLAG_NONE: no flag
96 * @GST_BASE_PARSE_FRAME_FLAG_NO_FRAME: set to indicate this buffer should not be
97 * counted as frame, e.g. if this frame is dependent on a previous one.
98 * As it is not counted as a frame, bitrate increases but frame to time
99 * conversions are maintained.
100 * @GST_BASE_PARSE_FRAME_FLAG_CLIP: @pre_push_frame can set this to indicate
101 * that regular segment clipping can still be performed (as opposed to
102 * any custom one having been done).
103 * @GST_BASE_PARSE_FRAME_FLAG_DROP: indicates to @finish_frame that the
104 * the frame should be dropped (and might be handled internall by subclass)
105 * @GST_BASE_PARSE_FRAME_FLAG_QUEUE: indicates to @finish_frame that the
106 * the frame should be queued for now and processed fully later
107 * when the first non-queued frame is finished
109 * Flags to be used in a #GstBaseParseFrame.
114 GST_BASE_PARSE_FRAME_FLAG_NONE = 0,
115 GST_BASE_PARSE_FRAME_FLAG_NO_FRAME = (1 << 0),
116 GST_BASE_PARSE_FRAME_FLAG_CLIP = (1 << 1),
117 GST_BASE_PARSE_FRAME_FLAG_DROP = (1 << 2),
118 GST_BASE_PARSE_FRAME_FLAG_QUEUE = (1 << 3)
119 } GstBaseParseFrameFlags;
123 * @buffer: input data to be parsed for frames.
124 * @out_buffer: (optional) (replacement) output data.
125 * @offset: media specific offset of input frame
126 * Note that a converter may have a different one on the frame's buffer.
127 * @overhead: subclass can set this to indicates the metadata overhead
128 * for the given frame, which is then used to enable more accurate bitrate
129 * computations. If this is -1, it is assumed that this frame should be
130 * skipped in bitrate calculation.
131 * @flags: a combination of input and output #GstBaseParseFrameFlags that
132 * convey additional context to subclass or allow subclass to tune
133 * subsequent #GstBaseParse actions.
135 * Frame (context) data passed to each frame parsing virtual methods. In
136 * addition to providing the data to be checked for a valid frame or an already
137 * identified frame, it conveys additional metadata or control information
138 * from and to the subclass w.r.t. the particular frame in question (rather
139 * than global parameters). Some of these may apply to each parsing stage, others
140 * only to some a particular one. These parameters are effectively zeroed at start
141 * of each frame's processing, i.e. parsing virtual method invocation sequence.
147 GstBuffer * out_buffer;
153 guint _gst_reserved_i[2];
154 gpointer _gst_reserved_p[2];
155 guint _private_flags;
158 typedef struct _GstBaseParse GstBaseParse;
159 typedef struct _GstBaseParseClass GstBaseParseClass;
160 typedef struct _GstBaseParsePrivate GstBaseParsePrivate;
164 * @element: the parent element.
166 * The opaque #GstBaseParse data structure.
168 struct _GstBaseParse {
172 /* source and sink pads */
178 /* MT-protected (with STREAM_LOCK) */
182 gpointer _gst_reserved[GST_PADDING_LARGE];
183 GstBaseParsePrivate *priv;
188 * @parent_class: the parent class
190 * Called when the element starts processing.
191 * Allows opening external resources.
193 * Called when the element stops processing.
194 * Allows closing external resources.
195 * @set_sink_caps: allows the subclass to be notified of the actual caps set.
196 * @get_sink_caps: allows the subclass to do its own sink get caps if needed.
197 * @handle_frame: Parses the input data into valid frames as defined by subclass
198 * which should be passed to gst_base_parse_finish_frame().
199 * The frame's input buffer is guaranteed writable,
200 * whereas the input frame ownership is held by caller
201 * (so subclass should make a copy if it needs to hang on).
202 * Input buffer (data) is equally managed by baseclass and should also be
203 * copied (e.g. gst_buffer_copy_region()) when needed.
204 * Time metadata will already be set as much as possible by baseclass
205 * according to upstream information and/or subclass settings,
206 * though subclass may still set buffer timestamp and duration
208 * @convert: Optional.
209 * Convert between formats.
211 * Event handler on the sink pad. This function should return
212 * TRUE if the event was handled and can be dropped.
213 * @src_event: Optional.
214 * Event handler on the source pad. Should return TRUE
215 * if the event was handled and can be dropped.
216 * @pre_push_frame: Optional.
217 * Called just prior to pushing a frame (after any pending
218 * events have been sent) to give subclass a chance to perform
219 * additional actions at this time (e.g. tag sending) or to
220 * decide whether this buffer should be dropped or not
221 * (e.g. custom segment clipping).
223 * Called until it doesn't return GST_FLOW_OK anymore for
224 * the first buffers. Can be used by the subclass to detect
225 * the stream format. Since: 0.10.36
227 * Subclasses can override any of the available virtual methods or not, as
228 * needed. At minimum @check_valid_frame and @parse_frame needs to be
231 struct _GstBaseParseClass {
232 GstElementClass parent_class;
235 /* virtual methods for subclasses */
237 gboolean (*start) (GstBaseParse * parse);
239 gboolean (*stop) (GstBaseParse * parse);
241 gboolean (*set_sink_caps) (GstBaseParse * parse,
244 GstFlowReturn (*handle_frame) (GstBaseParse * parse,
245 GstBaseParseFrame * frame,
248 GstFlowReturn (*pre_push_frame) (GstBaseParse * parse,
249 GstBaseParseFrame * frame);
251 gboolean (*convert) (GstBaseParse * parse,
252 GstFormat src_format,
254 GstFormat dest_format,
255 gint64 * dest_value);
257 gboolean (*event) (GstBaseParse * parse,
260 gboolean (*src_event) (GstBaseParse * parse,
263 GstCaps * (*get_sink_caps) (GstBaseParse * parse,
266 GstFlowReturn (*detect) (GstBaseParse * parse,
270 gpointer _gst_reserved[GST_PADDING_LARGE];
273 GType gst_base_parse_get_type (void);
275 GType gst_base_parse_frame_get_type (void);
277 GstBaseParseFrame * gst_base_parse_frame_new (GstBuffer * buffer,
278 GstBaseParseFrameFlags flags,
281 void gst_base_parse_frame_init (GstBaseParseFrame * frame);
283 void gst_base_parse_frame_free (GstBaseParseFrame * frame);
285 GstFlowReturn gst_base_parse_push_frame (GstBaseParse * parse,
286 GstBaseParseFrame * frame);
288 GstFlowReturn gst_base_parse_finish_frame (GstBaseParse * parse,
289 GstBaseParseFrame * frame,
292 void gst_base_parse_set_duration (GstBaseParse * parse,
297 void gst_base_parse_set_average_bitrate (GstBaseParse * parse,
300 void gst_base_parse_set_min_frame_size (GstBaseParse * parse,
303 void gst_base_parse_set_has_timing_info (GstBaseParse * parse,
304 gboolean has_timing);
306 void gst_base_parse_set_syncable (GstBaseParse * parse,
309 void gst_base_parse_set_passthrough (GstBaseParse * parse,
310 gboolean passthrough);
312 void gst_base_parse_set_frame_rate (GstBaseParse * parse,
318 void gst_base_parse_set_latency (GstBaseParse * parse,
319 GstClockTime min_latency,
320 GstClockTime max_latency);
322 gboolean gst_base_parse_convert_default (GstBaseParse * parse,
323 GstFormat src_format,
325 GstFormat dest_format,
326 gint64 * dest_value);
328 gboolean gst_base_parse_add_index_entry (GstBaseParse * parse,
336 #endif /* __GST_BASE_PARSE_H__ */