2 * This file is part of FFmpeg.
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 #ifndef AVFILTER_BUFFERSINK_H
20 #define AVFILTER_BUFFERSINK_H
24 * memory buffer sink API for audio and video
30 * Struct to use for initializing a buffersink context.
33 const enum PixelFormat *pixel_fmts; ///< list of allowed pixel formats, terminated by PIX_FMT_NONE
37 * Create an AVBufferSinkParams structure.
39 * Must be freed with av_free().
41 AVBufferSinkParams *av_buffersink_params_alloc(void);
44 * Struct to use for initializing an abuffersink context.
47 const enum AVSampleFormat *sample_fmts; ///< list of allowed sample formats, terminated by AV_SAMPLE_FMT_NONE
48 const int64_t *channel_layouts; ///< list of allowed channel layouts, terminated by -1
50 const int *packing_fmts; ///< list of allowed packing formats
52 } AVABufferSinkParams;
55 * Create an AVABufferSinkParams structure.
57 * Must be freed with av_free().
59 AVABufferSinkParams *av_abuffersink_params_alloc(void);
62 * Tell av_buffersink_get_buffer_ref() to read video/samples buffer
63 * reference, but not remove it from the buffer. This is useful if you
64 * need only to read a video/samples buffer, without to fetch it.
66 #define AV_BUFFERSINK_FLAG_PEEK 1
69 * Tell av_buffersink_get_buffer_ref() not to request a frame from its input.
70 * If a frame is already buffered, it is read (and removed from the buffer),
71 * but if no frame is present, return AVERROR(EAGAIN).
73 #define AV_BUFFERSINK_FLAG_NO_REQUEST 2
76 * Get an audio/video buffer data from buffer_sink and put it in bufref.
78 * This function works with both audio and video buffer sinks.
80 * @param buffer_sink pointer to a buffersink or abuffersink context
81 * @param flags a combination of AV_BUFFERSINK_FLAG_* flags
82 * @return >= 0 in case of success, a negative AVERROR code in case of
85 int av_buffersink_get_buffer_ref(AVFilterContext *buffer_sink,
86 AVFilterBufferRef **bufref, int flags);
90 * Get the number of immediately available frames.
92 int av_buffersink_poll_frame(AVFilterContext *ctx);
94 #if FF_API_OLD_VSINK_API
96 * @deprecated Use av_buffersink_get_buffer_ref() instead.
99 int av_vsink_buffer_get_video_buffer_ref(AVFilterContext *buffer_sink,
100 AVFilterBufferRef **picref, int flags);
104 * Get a buffer with filtered data from sink and put it in buf.
106 * @param sink pointer to a context of a buffersink or abuffersink AVFilter.
107 * @param buf pointer to the buffer will be written here if buf is non-NULL. buf
108 * must be freed by the caller using avfilter_unref_buffer().
109 * Buf may also be NULL to query whether a buffer is ready to be
112 * @return >= 0 in case of success, a negative AVERROR code in case of
115 int av_buffersink_read(AVFilterContext *sink, AVFilterBufferRef **buf);
118 * Same as av_buffersink_read, but with the ability to specify the number of
119 * samples read. This function is less efficient than av_buffersink_read(),
120 * because it copies the data around.
122 * @param sink pointer to a context of the abuffersink AVFilter.
123 * @param buf pointer to the buffer will be written here if buf is non-NULL. buf
124 * must be freed by the caller using avfilter_unref_buffer(). buf
125 * will contain exactly nb_samples audio samples, except at the end
126 * of stream, when it can contain less than nb_samples.
127 * Buf may also be NULL to query whether a buffer is ready to be
130 * @warning do not mix this function with av_buffersink_read(). Use only one or
131 * the other with a single sink, not both.
133 int av_buffersink_read_samples(AVFilterContext *ctx, AVFilterBufferRef **buf,
136 #endif /* AVFILTER_BUFFERSINK_H */