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buffersrc.h
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1 /*
2  *
3  * This file is part of FFmpeg.
4  *
5  * FFmpeg is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Lesser General Public
7  * License as published by the Free Software Foundation; either
8  * version 2.1 of the License, or (at your option) any later version.
9  *
10  * FFmpeg is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  * Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General Public
16  * License along with FFmpeg; if not, write to the Free Software
17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18  */
19 
20 #ifndef AVFILTER_BUFFERSRC_H
21 #define AVFILTER_BUFFERSRC_H
22 
23 /**
24  * @file
25  * Memory buffer source API.
26  */
27 
28 #include "libavcodec/avcodec.h"
29 #include "avfilter.h"
30 
31 enum {
32 
33  /**
34  * Do not check for format changes.
35  */
37 
38 #if FF_API_AVFILTERBUFFER
39  /**
40  * Ignored
41  */
42  AV_BUFFERSRC_FLAG_NO_COPY = 2,
43 #endif
44 
45  /**
46  * Immediately push the frame to the output.
47  */
49 
50  /**
51  * Keep a reference to the frame.
52  * If the frame if reference-counted, create a new reference; otherwise
53  * copy the frame data.
54  */
56 
57 };
58 
59 /**
60  * Add buffer data in picref to buffer_src.
61  *
62  * @param buffer_src pointer to a buffer source context
63  * @param picref a buffer reference, or NULL to mark EOF
64  * @param flags a combination of AV_BUFFERSRC_FLAG_*
65  * @return >= 0 in case of success, a negative AVERROR code
66  * in case of failure
67  */
69  AVFilterBufferRef *picref, int flags);
70 
71 /**
72  * Get the number of failed requests.
73  *
74  * A failed request is when the request_frame method is called while no
75  * frame is present in the buffer.
76  * The number is reset when a frame is added.
77  */
79 
80 #if FF_API_AVFILTERBUFFER
81 /**
82  * Add a buffer to the filtergraph s.
83  *
84  * @param buf buffer containing frame data to be passed down the filtergraph.
85  * This function will take ownership of buf, the user must not free it.
86  * A NULL buf signals EOF -- i.e. no more frames will be sent to this filter.
87  *
88  * @deprecated use av_buffersrc_write_frame() or av_buffersrc_add_frame()
89  */
91 int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf);
92 #endif
93 
94 /**
95  * Add a frame to the buffer source.
96  *
97  * @param s an instance of the buffersrc filter.
98  * @param frame frame to be added. If the frame is reference counted, this
99  * function will make a new reference to it. Otherwise the frame data will be
100  * copied.
101  *
102  * @return 0 on success, a negative AVERROR on error
103  *
104  * This function is equivalent to av_buffersrc_add_frame_flags() with the
105  * AV_BUFFERSRC_FLAG_KEEP_REF flag.
106  */
108 
109 /**
110  * Add a frame to the buffer source.
111  *
112  * @param s an instance of the buffersrc filter.
113  * @param frame frame to be added. If the frame is reference counted, this
114  * function will take ownership of the reference(s) and reset the frame.
115  * Otherwise the frame data will be copied. If this function returns an error,
116  * the input frame is not touched.
117  *
118  * @return 0 on success, a negative AVERROR on error.
119  *
120  * @note the difference between this function and av_buffersrc_write_frame() is
121  * that av_buffersrc_write_frame() creates a new reference to the input frame,
122  * while this function takes ownership of the reference passed to it.
123  *
124  * This function is equivalent to av_buffersrc_add_frame_flags() without the
125  * AV_BUFFERSRC_FLAG_KEEP_REF flag.
126  */
128 
129 /**
130  * Add a frame to the buffer source.
131  *
132  * By default, if the frame is reference-counted, this function will take
133  * ownership of the reference(s) and reset the frame. This can be controled
134  * using the flags.
135  *
136  * If this function returns an error, the input frame is not touched.
137  *
138  * @param buffer_src pointer to a buffer source context
139  * @param frame a frame, or NULL to mark EOF
140  * @param flags a combination of AV_BUFFERSRC_FLAG_*
141  * @return >= 0 in case of success, a negative AVERROR code
142  * in case of failure
143  */
145  AVFrame *frame, int flags);
146 
147 
148 #endif /* AVFILTER_BUFFERSRC_H */