gstvideoutils.h 9.57 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
/* GStreamer
 * Copyright (C) 2008 David Schleef <ds@schleef.org>
 * Copyright (C) 2012 Collabora Ltd.
 *	Author : Edward Hervey <edward@collabora.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#ifndef _GST_VIDEO_UTILS_H_
#define _GST_VIDEO_UTILS_H_

#include <gst/gst.h>
#include <gst/video/video.h>

G_BEGIN_DECLS
#define GST_TYPE_VIDEO_CODEC_STATE \
  (gst_video_codec_state_get_type())

#define GST_TYPE_VIDEO_CODEC_FRAME \
  (gst_video_codec_frame_get_type())

typedef struct _GstVideoCodecState GstVideoCodecState;
typedef struct _GstVideoCodecFrame GstVideoCodecFrame;

/**
 * GstVideoCodecState:
 * @info: The #GstVideoInfo describing the stream
 * @caps: The #GstCaps
 * @codec_data: (optional) a #GstBuffer corresponding to the
 *     'codec_data' field of a stream.
 *
 * Structure representing the state of an incoming or outgoing video
 * stream for encoders and decoders.
 *
 * Decoders and encoders will receive such a state through their
 * respective @set_format vmethods.
 *
 * Decoders and encoders can set the downstream state, by using the
 * @gst_video_decoder_set_output_state() or
 * @gst_video_encoder_set_output_state() methods.
 */
struct _GstVideoCodecState
{
  /*< private >*/
  gint ref_count;

  /*< public >*/
  GstVideoInfo info;

  GstCaps *caps;

  GstBuffer *codec_data;

  /*< private >*/
  void         *padding[GST_PADDING_LARGE];
};

/**
 * GstVideoCodecFrameFlags:
 * @GST_VIDEO_CODEC_FRAME_FLAG_DECODE_ONLY: is the frame only meant to be decoded
 * @GST_VIDEO_CODEC_FRAME_FLAG_SYNC_POINT: is the frame a synchronization point (keyframe)
 * @GST_VIDEO_CODEC_FRAME_FLAG_FORCE_KEYFRAME: should the output frame be made a keyframe
 * @GST_VIDEO_CODEC_FRAME_FLAG_FORCE_KEYFRAME_HEADERS: should the encoder output stream headers
 * @GST_VIDEO_CODEC_FRAME_FLAG_TFF: top-field first
 * @GST_VIDEO_CODEC_FRAME_FLAG_RFF: the field is repeated
 * @GST_VIDEO_CODEC_FRAME_FLAG_ONEFIELD: only one field is present
 *
 * Flags for #GstVideoCodecFrame
 */
typedef enum
{
  GST_VIDEO_CODEC_FRAME_FLAG_DECODE_ONLY            = (1<<0),
  GST_VIDEO_CODEC_FRAME_FLAG_SYNC_POINT             = (1<<1),
  GST_VIDEO_CODEC_FRAME_FLAG_FORCE_KEYFRAME         = (1<<2),
  GST_VIDEO_CODEC_FRAME_FLAG_FORCE_KEYFRAME_HEADERS = (1<<3),
  GST_VIDEO_CODEC_FRAME_FLAG_TFF                    = (1<<4),
  GST_VIDEO_CODEC_FRAME_FLAG_RFF                    = (1<<5),
  GST_VIDEO_CODEC_FRAME_FLAG_ONEFIELD               = (1<<6)
} GstVideoCodecFrameFlags;

/**
 * GST_VIDEO_CODEC_FRAME_FLAGS:
 * @frame: a #GstVideoCodecFrame
 *
 * The entire set of flags for the @frame
 */
#define GST_VIDEO_CODEC_FRAME_FLAGS(frame) ((frame)->flags)

/**
 * GST_VIDEO_CODEC_FRAME_FLAG_IS_SET:
 * @frame: a #GstVideoCodecFrame
 * @flag: a flag to check for
 *
 * Checks whether the given @flag is set
 */
#define GST_VIDEO_CODEC_FRAME_FLAG_IS_SET(frame,flag)   !!(GST_VIDEO_CODEC_FRAME_FLAGS(frame) & (flag))

/**
 * GST_VIDEO_CODEC_FRAME_FLAG_SET:
 * @frame: a #GstVideoCodecFrame
 * @flag: Flag to set, can be any number of bits in guint32.
 *
 * This macro sets the given bits
 */
#define GST_VIDEO_CODEC_FRAME_FLAG_SET(frame,flag)     (GST_VIDEO_CODEC_FRAME_FLAGS(frame) |= (flag))

/**
 * GST_VIDEO_CODEC_FRAME_FLAG_UNSET:
 * @frame: a #GstVideoCodecFrame
 * @flag: Flag to unset
 *
 * This macro usets the given bits.
 */
#define GST_VIDEO_CODEC_FRAME_FLAG_UNSET(frame,flag)   (GST_VIDEO_CODEC_FRAME_FLAGS(frame) &= ~(flag))

/**
 * GST_VIDEO_CODEC_FRAME_IS_DECODE_ONLY:
 * @frame: a #GstVideoCodecFrame
 *
 * Tests if the buffer should only be decoded but not sent downstream.
 */
#define GST_VIDEO_CODEC_FRAME_IS_DECODE_ONLY(frame)     (GST_VIDEO_CODEC_FRAME_FLAG_IS_SET(frame, GST_VIDEO_CODEC_FRAME_FLAG_DECODE_ONLY))

/**
 * GST_VIDEO_CODEC_FRAME_SET_DECODE_ONLY:
 * @frame: a #GstVideoCodecFrame
 *
 * Sets the buffer to not be sent downstream.
 *
 * Decoder implementation can use this if they have frames that
 * are not meant to be displayed.
 *
 * Encoder implementation can safely ignore this field.
 */
#define GST_VIDEO_CODEC_FRAME_SET_DECODE_ONLY(frame)    (GST_VIDEO_CODEC_FRAME_FLAG_SET(frame, GST_VIDEO_CODEC_FRAME_FLAG_DECODE_ONLY))

/**
 * GST_VIDEO_CODEC_FRAME_IS_SYNC_POINT:
 * @frame: a #GstVideoCodecFrame
 *
 * Tests if the frame is a synchronization point (like a keyframe).
 *
 * Decoder implementations can use this to detect keyframes.
 */
#define GST_VIDEO_CODEC_FRAME_IS_SYNC_POINT(frame)      (GST_VIDEO_CODEC_FRAME_FLAG_IS_SET(frame, GST_VIDEO_CODEC_FRAME_FLAG_SYNC_POINT))

/**
 * GST_VIDEO_CODEC_FRAME_SET_SYNC_POINT:
 * @frame: a #GstVideoCodecFrame
 *
 * Sets the frame to be a synchronization point (like a keyframe).
 *
 * Encoder implementations should set this accordingly.
 *
 * Decoder implementing parsing features should set this when they
 * detect such a synchronization point.
 */
#define GST_VIDEO_CODEC_FRAME_SET_SYNC_POINT(frame)     (GST_VIDEO_CODEC_FRAME_FLAG_SET(frame, GST_VIDEO_CODEC_FRAME_FLAG_SYNC_POINT))
#define GST_VIDEO_CODEC_FRAME_UNSET_SYNC_POINT(frame)   (GST_VIDEO_CODEC_FRAME_FLAG_UNSET(frame, GST_VIDEO_CODEC_FRAME_FLAG_SYNC_POINT))


/**
 * GST_VIDEO_CODEC_FRAME_IS_FORCE_KEYFRAME:
 * @frame: a #GstVideoCodecFrame
 *
 * Tests if the frame must be encoded as a keyframe. Applies only to
 * frames provided to encoders. Decoders can safely ignore this field.
 */
#define GST_VIDEO_CODEC_FRAME_IS_FORCE_KEYFRAME(frame)      (GST_VIDEO_CODEC_FRAME_FLAG_IS_SET(frame, GST_VIDEO_CODEC_FRAME_FLAG_FORCE_KEYFRAME))
#define GST_VIDEO_CODEC_FRAME_SET_FORCE_KEYFRAME(frame)     (GST_VIDEO_CODEC_FRAME_FLAG_SET(frame, GST_VIDEO_CODEC_FRAME_FLAG_FORCE_KEYFRAME))
#define GST_VIDEO_CODEC_FRAME_UNSET_FORCE_KEYFRAME(frame)   (GST_VIDEO_CODEC_FRAME_FLAG_UNSET(frame, GST_VIDEO_CODEC_FRAME_FLAG_FORCE_KEYFRAME))

/**
 * GST_VIDEO_CODEC_FRAME_IS_FORCE_KEYFRAME_HEADERS:
 * @frame: a #GstVideoCodecFrame
 *
 * Tests if encoder should output stream headers before outputting the
 * resulting encoded buffer for the given frame.
 *
 * Applies only to frames provided to encoders. Decoders can safely
 * ignore this field.
 */
#define GST_VIDEO_CODEC_FRAME_IS_FORCE_KEYFRAME_HEADERS(frame)      (GST_VIDEO_CODEC_FRAME_FLAG_IS_SET(frame, GST_VIDEO_CODEC_FRAME_FLAG_FORCE_KEYFRAME_HEADERS))
#define GST_VIDEO_CODEC_FRAME_SET_FORCE_KEYFRAME_HEADERS(frame)     (GST_VIDEO_CODEC_FRAME_FLAG_SET(frame, GST_VIDEO_CODEC_FRAME_FLAG_FORCE_KEYFRAME_HEADERS))
#define GST_VIDEO_CODEC_FRAME_UNSET_FORCE_KEYFRAME_HEADERS(frame)   (GST_VIDEO_CODEC_FRAME_FLAG_UNSET(frame, GST_VIDEO_CODEC_FRAME_FLAG_FORCE_KEYFRAME_HEADERS))

/**
 * GstVideoCodecFrame:
 * @pts: Presentation timestamp
 * @dts: Decoding timestamp
 * @duration: Duration of the frame
 * @system_frame_number: Unique identifier for the frame. Use this if you need
 *       to get hold of the frame later (like when data is being decoded).
 *       Typical usage in decoders is to set this on the opaque value provided
 *       to the library and get back the frame using gst_video_decoder_get_frame()
 * @distance_from_sync: Distance in frames from the last synchronization point.
 * @input_buffer: the input #GstBuffer that created this frame.
 * @output_buffer: the output #GstBuffer. Implementations should set this either
 *           directly, or by using the @gst_video_decoder_alloc_output_frame() or
 *           @gst_video_decoder_alloc_output_buffer() methods.
 * @field_index:
 * @n_fields: number of fields in the frame (default 2). Decoders can change
 *       this if the frame contains a different number of fields. 
 * @deadline: Running time when the frame will be used.
 * @events: Events that will be pushed downstream before this frame is pushed.
 *
 * A #GstVideoCodecFrame represents a video frame both in raw and
 * encoded form.
 */
struct _GstVideoCodecFrame
{
  /*< private >*/
  gint ref_count;

  guint32 flags;

  /*< public >*/
  gint system_frame_number;	/* ED */
  gint decode_frame_number;	/* ED */
  gint presentation_frame_number; /* ED */

  GstClockTime dts;       /* ED */
  GstClockTime pts;       /* ED */
  GstClockTime duration;  /* ED */

  int distance_from_sync;	/* ED */

  GstBuffer *input_buffer;	/* ED */
  GstBuffer *output_buffer;	/* ED */

  GstClockTime deadline;	/* D */

  /* Events that should be pushed downstream *before*
   * the next output_buffer */
  GList *events;		/* ED */

  /*< private >*/

  void *coder_hook;
  GDestroyNotify coder_hook_destroy_notify;

  void         *padding[GST_PADDING_LARGE];
};

/* GstVideoCodecState */
GType           gst_video_codec_state_get_type (void);

GstVideoCodecState *gst_video_codec_state_ref (GstVideoCodecState * state);

void                gst_video_codec_state_unref (GstVideoCodecState * state);


/* GstVideoCodecFrame */
GType                gst_video_codec_frame_get_type (void);

GstVideoCodecFrame  *gst_video_codec_frame_ref (GstVideoCodecFrame * frame);
void                 gst_video_codec_frame_unref (GstVideoCodecFrame * frame);
void                 gst_video_codec_frame_set_hook (GstVideoCodecFrame *frame,
						     void *hook,
						     GDestroyNotify notify);

G_END_DECLS

#endif