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., 51 Franklin St, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
22 #ifndef __GST_BASE_PARSE_H__
23 #define __GST_BASE_PARSE_H__
26 #include <gst/base/base-prelude.h>
30 #define GST_TYPE_BASE_PARSE (gst_base_parse_get_type())
31 #define GST_BASE_PARSE(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BASE_PARSE,GstBaseParse))
32 #define GST_BASE_PARSE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_BASE_PARSE,GstBaseParseClass))
33 #define GST_BASE_PARSE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj),GST_TYPE_BASE_PARSE,GstBaseParseClass))
34 #define GST_IS_BASE_PARSE(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BASE_PARSE))
35 #define GST_IS_BASE_PARSE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BASE_PARSE))
36 #define GST_BASE_PARSE_CAST(obj) ((GstBaseParse *)(obj))
39 * GST_BASE_PARSE_SRC_PAD:
40 * @obj: base parse instance
42 * Gives the pointer to the source #GstPad object of the element.
44 #define GST_BASE_PARSE_SRC_PAD(obj) (GST_BASE_PARSE_CAST (obj)->srcpad)
47 * GST_BASE_PARSE_SINK_PAD:
48 * @obj: base parse instance
50 * Gives the pointer to the sink #GstPad object of the element.
52 #define GST_BASE_PARSE_SINK_PAD(obj) (GST_BASE_PARSE_CAST (obj)->sinkpad)
55 * GST_BASE_PARSE_FLOW_DROPPED:
57 * A #GstFlowReturn that can be returned from
58 * #GstBaseParseClass.handle_frame() to indicate that no output buffer was
59 * generated, or from #GstBaseParseClass.pre_push_frame() to to forego
62 #define GST_BASE_PARSE_FLOW_DROPPED GST_FLOW_CUSTOM_SUCCESS
64 /* not public API, use accessor macros below */
65 #define GST_BASE_PARSE_FLAG_LOST_SYNC (1 << 0)
66 #define GST_BASE_PARSE_FLAG_DRAINING (1 << 1)
69 * GST_BASE_PARSE_LOST_SYNC:
70 * @parse: base parse instance
72 * Obtains current sync status.
74 #define GST_BASE_PARSE_LOST_SYNC(parse) (!!(GST_BASE_PARSE_CAST(parse)->flags & GST_BASE_PARSE_FLAG_LOST_SYNC))
77 * GST_BASE_PARSE_DRAINING:
78 * @parse: base parse instance
80 * Obtains current drain status (ie. whether EOS has been received and
81 * the parser is now processing the frames at the end of the stream)
83 #define GST_BASE_PARSE_DRAINING(parse) (!!(GST_BASE_PARSE_CAST(parse)->flags & GST_BASE_PARSE_FLAG_DRAINING))
86 * GstBaseParseFrameFlags:
87 * @GST_BASE_PARSE_FRAME_FLAG_NONE: no flag
88 * @GST_BASE_PARSE_FRAME_FLAG_NEW_FRAME: set by baseclass if current frame
89 * is passed for processing to the subclass for the first time
90 * (and not set on subsequent calls with same data).
91 * @GST_BASE_PARSE_FRAME_FLAG_NO_FRAME: set to indicate this buffer should not be
92 * counted as frame, e.g. if this frame is dependent on a previous one.
93 * As it is not counted as a frame, bitrate increases but frame to time
94 * conversions are maintained.
95 * @GST_BASE_PARSE_FRAME_FLAG_CLIP: @pre_push_frame can set this to indicate
96 * that regular segment clipping can still be performed (as opposed to
97 * any custom one having been done).
98 * @GST_BASE_PARSE_FRAME_FLAG_DROP: indicates to @finish_frame that the
99 * the frame should be dropped (and might be handled internally by subclass)
100 * @GST_BASE_PARSE_FRAME_FLAG_QUEUE: indicates to @finish_frame that the
101 * the frame should be queued for now and processed fully later
102 * when the first non-queued frame is finished
104 * Flags to be used in a #GstBaseParseFrame.
107 GST_BASE_PARSE_FRAME_FLAG_NONE = 0,
108 GST_BASE_PARSE_FRAME_FLAG_NEW_FRAME = (1 << 0),
109 GST_BASE_PARSE_FRAME_FLAG_NO_FRAME = (1 << 1),
110 GST_BASE_PARSE_FRAME_FLAG_CLIP = (1 << 2),
111 GST_BASE_PARSE_FRAME_FLAG_DROP = (1 << 3),
112 GST_BASE_PARSE_FRAME_FLAG_QUEUE = (1 << 4)
113 } GstBaseParseFrameFlags;
117 * @buffer: input data to be parsed for frames.
118 * @out_buffer: output data.
119 * @offset: media specific offset of input frame
120 * Note that a converter may have a different one on the frame's buffer.
121 * @overhead: subclass can set this to indicates the metadata overhead
122 * for the given frame, which is then used to enable more accurate bitrate
123 * computations. If this is -1, it is assumed that this frame should be
124 * skipped in bitrate calculation.
125 * @flags: a combination of input and output #GstBaseParseFrameFlags that
126 * convey additional context to subclass or allow subclass to tune
127 * subsequent #GstBaseParse actions.
129 * Frame (context) data passed to each frame parsing virtual methods. In
130 * addition to providing the data to be checked for a valid frame or an already
131 * identified frame, it conveys additional metadata or control information
132 * from and to the subclass w.r.t. the particular frame in question (rather
133 * than global parameters). Some of these may apply to each parsing stage, others
134 * only to some a particular one. These parameters are effectively zeroed at start
135 * of each frame's processing, i.e. parsing virtual method invocation sequence.
139 GstBuffer * out_buffer;
145 guint _gst_reserved_i[2];
146 gpointer _gst_reserved_p[2];
147 guint _private_flags;
150 typedef struct _GstBaseParse GstBaseParse;
151 typedef struct _GstBaseParseClass GstBaseParseClass;
152 typedef struct _GstBaseParsePrivate GstBaseParsePrivate;
156 * @element: the parent element.
158 * The opaque #GstBaseParse data structure.
160 struct _GstBaseParse {
165 /* source and sink pads */
171 /* MT-protected (with STREAM_LOCK) */
175 gpointer _gst_reserved[GST_PADDING_LARGE];
176 GstBaseParsePrivate *priv;
181 * @parent_class: the parent class
183 * Called when the element starts processing.
184 * Allows opening external resources.
186 * Called when the element stops processing.
187 * Allows closing external resources.
188 * @set_sink_caps: Optional.
189 * Allows the subclass to be notified of the actual caps set.
190 * @get_sink_caps: Optional.
191 * Allows the subclass to do its own sink get caps if needed.
192 * @handle_frame: Parses the input data into valid frames as defined by subclass
193 * which should be passed to gst_base_parse_finish_frame().
194 * The frame's input buffer is guaranteed writable,
195 * whereas the input frame ownership is held by caller
196 * (so subclass should make a copy if it needs to hang on).
197 * Input buffer (data) is provided by baseclass with as much
198 * metadata set as possible by baseclass according to upstream
199 * information and/or subclass settings,
200 * though subclass may still set buffer timestamp and duration
202 * @convert: Optional.
203 * Convert between formats.
204 * @sink_event: Optional.
205 * Event handler on the sink pad. This function should chain
206 * up to the parent implementation to let the default handler
208 * @src_event: Optional.
209 * Event handler on the source pad. Should chain up to the
210 * parent to let the default handler run.
211 * @pre_push_frame: Optional.
212 * Called just prior to pushing a frame (after any pending
213 * events have been sent) to give subclass a chance to perform
214 * additional actions at this time (e.g. tag sending) or to
215 * decide whether this buffer should be dropped or not
216 * (e.g. custom segment clipping).
218 * Called until it doesn't return GST_FLOW_OK anymore for
219 * the first buffers. Can be used by the subclass to detect
221 * @sink_query: Optional.
222 * Query handler on the sink pad. This function should chain
223 * up to the parent implementation to let the default handler
225 * @src_query: Optional.
226 * Query handler on the source pad. Should chain up to the
227 * parent to let the default handler run (Since: 1.2)
229 * Subclasses can override any of the available virtual methods or not, as
230 * needed. At minimum @handle_frame needs to be overridden.
232 struct _GstBaseParseClass {
233 GstElementClass parent_class;
236 /* virtual methods for subclasses */
238 gboolean (*start) (GstBaseParse * parse);
240 gboolean (*stop) (GstBaseParse * parse);
242 gboolean (*set_sink_caps) (GstBaseParse * parse,
245 GstFlowReturn (*handle_frame) (GstBaseParse * parse,
246 GstBaseParseFrame * frame,
249 GstFlowReturn (*pre_push_frame) (GstBaseParse * parse,
250 GstBaseParseFrame * frame);
252 gboolean (*convert) (GstBaseParse * parse,
253 GstFormat src_format,
255 GstFormat dest_format,
256 gint64 * dest_value);
258 gboolean (*sink_event) (GstBaseParse * parse,
261 gboolean (*src_event) (GstBaseParse * parse,
264 GstCaps * (*get_sink_caps) (GstBaseParse * parse,
267 GstFlowReturn (*detect) (GstBaseParse * parse,
270 gboolean (*sink_query) (GstBaseParse * parse,
273 gboolean (*src_query) (GstBaseParse * parse,
277 gpointer _gst_reserved[GST_PADDING_LARGE - 2];
281 GType gst_base_parse_get_type (void);
284 GType gst_base_parse_frame_get_type (void);
287 GstBaseParseFrame * gst_base_parse_frame_new (GstBuffer * buffer,
288 GstBaseParseFrameFlags flags,
291 void gst_base_parse_frame_init (GstBaseParseFrame * frame);
294 GstBaseParseFrame * gst_base_parse_frame_copy (GstBaseParseFrame * frame);
296 void gst_base_parse_frame_free (GstBaseParseFrame * frame);
299 GstFlowReturn gst_base_parse_push_frame (GstBaseParse * parse,
300 GstBaseParseFrame * frame);
302 GstFlowReturn gst_base_parse_finish_frame (GstBaseParse * parse,
303 GstBaseParseFrame * frame,
306 void gst_base_parse_set_duration (GstBaseParse * parse,
311 void gst_base_parse_set_average_bitrate (GstBaseParse * parse,
314 void gst_base_parse_set_min_frame_size (GstBaseParse * parse,
317 void gst_base_parse_set_has_timing_info (GstBaseParse * parse,
318 gboolean has_timing);
320 void gst_base_parse_drain (GstBaseParse * parse);
323 void gst_base_parse_set_syncable (GstBaseParse * parse,
326 void gst_base_parse_set_passthrough (GstBaseParse * parse,
327 gboolean passthrough);
329 void gst_base_parse_set_pts_interpolation (GstBaseParse * parse,
330 gboolean pts_interpolate);
332 void gst_base_parse_set_infer_ts (GstBaseParse * parse,
335 void gst_base_parse_set_frame_rate (GstBaseParse * parse,
341 void gst_base_parse_set_latency (GstBaseParse * parse,
342 GstClockTime min_latency,
343 GstClockTime max_latency);
345 gboolean gst_base_parse_convert_default (GstBaseParse * parse,
346 GstFormat src_format,
348 GstFormat dest_format,
349 gint64 * dest_value);
351 gboolean gst_base_parse_add_index_entry (GstBaseParse * parse,
357 void gst_base_parse_set_ts_at_offset (GstBaseParse *parse,
360 void gst_base_parse_merge_tags (GstBaseParse * parse,
362 GstTagMergeMode mode);
364 #ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
365 G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstBaseParseFrame, gst_base_parse_frame_free)
368 #ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
369 G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstBaseParse, gst_object_unref)
374 #endif /* __GST_BASE_PARSE_H__ */