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144 lines
4.5 KiB
C
144 lines
4.5 KiB
C
/*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVFILTER_BUFFERSRC_H
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#define AVFILTER_BUFFERSRC_H
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/**
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* @file
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* @ingroup lavfi_buffersrc
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* Memory buffer source API.
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*/
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#include "avfilter.h"
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/**
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* @defgroup lavfi_buffersrc Buffer source API
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* @ingroup lavfi
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* @{
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*/
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/**
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* This structure contains the parameters describing the frames that will be
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* passed to this filter.
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*
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* It should be allocated with av_buffersrc_parameters_alloc() and freed with
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* av_free(). All the allocated fields in it remain owned by the caller.
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*/
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typedef struct AVBufferSrcParameters {
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/**
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* video: the pixel format, value corresponds to enum AVPixelFormat
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* audio: the sample format, value corresponds to enum AVSampleFormat
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*/
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int format;
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/**
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* The timebase to be used for the timestamps on the input frames.
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*/
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AVRational time_base;
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/**
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* Video only, the display dimensions of the input frames.
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*/
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int width, height;
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/**
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* Video only, the sample (pixel) aspect ratio.
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*/
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AVRational sample_aspect_ratio;
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/**
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* Video only, the frame rate of the input video. This field must only be
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* set to a non-zero value if input stream has a known constant framerate
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* and should be left at its initial value if the framerate is variable or
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* unknown.
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*/
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AVRational frame_rate;
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/**
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* Video with a hwaccel pixel format only. This should be a reference to an
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* AVHWFramesContext instance describing the input frames.
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*/
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AVBufferRef *hw_frames_ctx;
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/**
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* Audio only, the audio sampling rate in samples per secon.
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*/
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int sample_rate;
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/**
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* Audio only, the audio channel layout
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*/
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uint64_t channel_layout;
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} AVBufferSrcParameters;
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/**
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* Allocate a new AVBufferSrcParameters instance. It should be freed by the
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* caller with av_free().
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*/
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AVBufferSrcParameters *av_buffersrc_parameters_alloc(void);
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/**
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* Initialize the buffersrc or abuffersrc filter with the provided parameters.
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* This function may be called multiple times, the later calls override the
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* previous ones. Some of the parameters may also be set through AVOptions, then
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* whatever method is used last takes precedence.
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*
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* @param ctx an instance of the buffersrc or abuffersrc filter
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* @param param the stream parameters. The frames later passed to this filter
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* must conform to those parameters. All the allocated fields in
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* param remain owned by the caller, libavfilter will make internal
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* copies or references when necessary.
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* @return 0 on success, a negative AVERROR code on failure.
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*/
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int av_buffersrc_parameters_set(AVFilterContext *ctx, AVBufferSrcParameters *param);
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/**
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* Add a frame to the buffer source.
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*
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* @param ctx an instance of the buffersrc filter
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* @param frame frame to be added. If the frame is reference counted, this
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* function will make a new reference to it. Otherwise the frame data will be
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* copied.
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*
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* @return 0 on success, a negative AVERROR on error
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*/
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int av_buffersrc_write_frame(AVFilterContext *ctx, const AVFrame *frame);
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/**
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* Add a frame to the buffer source.
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*
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* @param ctx an instance of the buffersrc filter
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* @param frame frame to be added. If the frame is reference counted, this
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* function will take ownership of the reference(s) and reset the frame.
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* Otherwise the frame data will be copied. If this function returns an error,
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* the input frame is not touched.
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*
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* @return 0 on success, a negative AVERROR on error.
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*
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* @note the difference between this function and av_buffersrc_write_frame() is
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* that av_buffersrc_write_frame() creates a new reference to the input frame,
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* while this function takes ownership of the reference passed to it.
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*/
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int av_buffersrc_add_frame(AVFilterContext *ctx, AVFrame *frame);
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/**
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* @}
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*/
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#endif /* AVFILTER_BUFFERSRC_H */
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