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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  * @ingroup lavfi_buffersrc
26  * Memory buffer source API.
27  */
28 
29 #include "libavcodec/avcodec.h"
30 #include "avfilter.h"
31 
32 /**
33  * @defgroup lavfi_buffersrc Buffer source API
34  * @ingroup lavfi
35  * @{
36  */
37 
38 enum {
39 
40  /**
41  * Do not check for format changes.
42  */
44 
45 #if FF_API_AVFILTERBUFFER
46  /**
47  * Ignored
48  */
49  AV_BUFFERSRC_FLAG_NO_COPY = 2,
50 #endif
51 
52  /**
53  * Immediately push the frame to the output.
54  */
56 
57  /**
58  * Keep a reference to the frame.
59  * If the frame if reference-counted, create a new reference; otherwise
60  * copy the frame data.
61  */
63 
64 };
65 
66 /**
67  * Add buffer data in picref to buffer_src.
68  *
69  * @param buffer_src pointer to a buffer source context
70  * @param picref a buffer reference, or NULL to mark EOF
71  * @param flags a combination of AV_BUFFERSRC_FLAG_*
72  * @return >= 0 in case of success, a negative AVERROR code
73  * in case of failure
74  */
76  AVFilterBufferRef *picref, int flags);
77 
78 /**
79  * Get the number of failed requests.
80  *
81  * A failed request is when the request_frame method is called while no
82  * frame is present in the buffer.
83  * The number is reset when a frame is added.
84  */
86 
87 #if FF_API_AVFILTERBUFFER
88 /**
89  * Add a buffer to a filtergraph.
90  *
91  * @param ctx an instance of the buffersrc filter
92  * @param buf buffer containing frame data to be passed down the filtergraph.
93  * This function will take ownership of buf, the user must not free it.
94  * A NULL buf signals EOF -- i.e. no more frames will be sent to this filter.
95  *
96  * @deprecated use av_buffersrc_write_frame() or av_buffersrc_add_frame()
97  */
99 int av_buffersrc_buffer(AVFilterContext *ctx, AVFilterBufferRef *buf);
100 #endif
101 
102 /**
103  * Add a frame to the buffer source.
104  *
105  * @param ctx an instance of the buffersrc filter
106  * @param frame frame to be added. If the frame is reference counted, this
107  * function will make a new reference to it. Otherwise the frame data will be
108  * copied.
109  *
110  * @return 0 on success, a negative AVERROR on error
111  *
112  * This function is equivalent to av_buffersrc_add_frame_flags() with the
113  * AV_BUFFERSRC_FLAG_KEEP_REF flag.
114  */
116 
117 /**
118  * Add a frame to the buffer source.
119  *
120  * @param ctx an instance of the buffersrc filter
121  * @param frame frame to be added. If the frame is reference counted, this
122  * function will take ownership of the reference(s) and reset the frame.
123  * Otherwise the frame data will be copied. If this function returns an error,
124  * the input frame is not touched.
125  *
126  * @return 0 on success, a negative AVERROR on error.
127  *
128  * @note the difference between this function and av_buffersrc_write_frame() is
129  * that av_buffersrc_write_frame() creates a new reference to the input frame,
130  * while this function takes ownership of the reference passed to it.
131  *
132  * This function is equivalent to av_buffersrc_add_frame_flags() without the
133  * AV_BUFFERSRC_FLAG_KEEP_REF flag.
134  */
136 
137 /**
138  * Add a frame to the buffer source.
139  *
140  * By default, if the frame is reference-counted, this function will take
141  * ownership of the reference(s) and reset the frame. This can be controled
142  * using the flags.
143  *
144  * If this function returns an error, the input frame is not touched.
145  *
146  * @param buffer_src pointer to a buffer source context
147  * @param frame a frame, or NULL to mark EOF
148  * @param flags a combination of AV_BUFFERSRC_FLAG_*
149  * @return >= 0 in case of success, a negative AVERROR code
150  * in case of failure
151  */
153  AVFrame *frame, int flags);
154 
155 
156 /**
157  * @}
158  */
159 
160 #endif /* AVFILTER_BUFFERSRC_H */