144 lines
4.5 KiB
C
144 lines
4.5 KiB
C
/*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* Libav 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVFILTER_BUFFERSRC_H
|
|
#define AVFILTER_BUFFERSRC_H
|
|
|
|
/**
|
|
* @file
|
|
* @ingroup lavfi_buffersrc
|
|
* Memory buffer source API.
|
|
*/
|
|
|
|
#include "avfilter.h"
|
|
|
|
/**
|
|
* @defgroup lavfi_buffersrc Buffer source API
|
|
* @ingroup lavfi
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* This structure contains the parameters describing the frames that will be
|
|
* passed to this filter.
|
|
*
|
|
* It should be allocated with av_buffersrc_parameters_alloc() and freed with
|
|
* av_free(). All the allocated fields in it remain owned by the caller.
|
|
*/
|
|
typedef struct AVBufferSrcParameters {
|
|
/**
|
|
* video: the pixel format, value corresponds to enum AVPixelFormat
|
|
* audio: the sample format, value corresponds to enum AVSampleFormat
|
|
*/
|
|
int format;
|
|
/**
|
|
* The timebase to be used for the timestamps on the input frames.
|
|
*/
|
|
AVRational time_base;
|
|
|
|
/**
|
|
* Video only, the display dimensions of the input frames.
|
|
*/
|
|
int width, height;
|
|
|
|
/**
|
|
* Video only, the sample (pixel) aspect ratio.
|
|
*/
|
|
AVRational sample_aspect_ratio;
|
|
|
|
/**
|
|
* Video only, the frame rate of the input video. This field must only be
|
|
* set to a non-zero value if input stream has a known constant framerate
|
|
* and should be left at its initial value if the framerate is variable or
|
|
* unknown.
|
|
*/
|
|
AVRational frame_rate;
|
|
|
|
/**
|
|
* Video with a hwaccel pixel format only. This should be a reference to an
|
|
* AVHWFramesContext instance describing the input frames.
|
|
*/
|
|
AVBufferRef *hw_frames_ctx;
|
|
|
|
/**
|
|
* Audio only, the audio sampling rate in samples per secon.
|
|
*/
|
|
int sample_rate;
|
|
|
|
/**
|
|
* Audio only, the audio channel layout
|
|
*/
|
|
uint64_t channel_layout;
|
|
} AVBufferSrcParameters;
|
|
|
|
/**
|
|
* Allocate a new AVBufferSrcParameters instance. It should be freed by the
|
|
* caller with av_free().
|
|
*/
|
|
AVBufferSrcParameters *av_buffersrc_parameters_alloc(void);
|
|
|
|
/**
|
|
* Initialize the buffersrc or abuffersrc filter with the provided parameters.
|
|
* This function may be called multiple times, the later calls override the
|
|
* previous ones. Some of the parameters may also be set through AVOptions, then
|
|
* whatever method is used last takes precedence.
|
|
*
|
|
* @param ctx an instance of the buffersrc or abuffersrc filter
|
|
* @param param the stream parameters. The frames later passed to this filter
|
|
* must conform to those parameters. All the allocated fields in
|
|
* param remain owned by the caller, libavfilter will make internal
|
|
* copies or references when necessary.
|
|
* @return 0 on success, a negative AVERROR code on failure.
|
|
*/
|
|
int av_buffersrc_parameters_set(AVFilterContext *ctx, AVBufferSrcParameters *param);
|
|
|
|
/**
|
|
* Add a frame to the buffer source.
|
|
*
|
|
* @param ctx an instance of the buffersrc filter
|
|
* @param frame frame to be added. If the frame is reference counted, this
|
|
* function will make a new reference to it. Otherwise the frame data will be
|
|
* copied.
|
|
*
|
|
* @return 0 on success, a negative AVERROR on error
|
|
*/
|
|
int av_buffersrc_write_frame(AVFilterContext *ctx, const AVFrame *frame);
|
|
|
|
/**
|
|
* Add a frame to the buffer source.
|
|
*
|
|
* @param ctx an instance of the buffersrc filter
|
|
* @param frame frame to be added. If the frame is reference counted, this
|
|
* function will take ownership of the reference(s) and reset the frame.
|
|
* Otherwise the frame data will be copied. If this function returns an error,
|
|
* the input frame is not touched.
|
|
*
|
|
* @return 0 on success, a negative AVERROR on error.
|
|
*
|
|
* @note the difference between this function and av_buffersrc_write_frame() is
|
|
* that av_buffersrc_write_frame() creates a new reference to the input frame,
|
|
* while this function takes ownership of the reference passed to it.
|
|
*/
|
|
int av_buffersrc_add_frame(AVFilterContext *ctx, AVFrame *frame);
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
#endif /* AVFILTER_BUFFERSRC_H */
|