tool/VideoPlayer.git

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			/*
			* This file is part of FFmpeg.
			*
			* FFmpeg 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.
			*
			* FFmpeg 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 FFmpeg; 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
			* @{
			*/

			enum {

			/**
			* Do not check for format changes.
			*/
			AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT = 1,

			/**
			* Immediately push the frame to the output.
			*/
			AV_BUFFERSRC_FLAG_PUSH = 4,

			/**
			* Keep a reference to the frame.
			* If the frame if reference-counted, create a new reference; otherwise
			* copy the frame data.
			*/
			AV_BUFFERSRC_FLAG_KEEP_REF = 8,

			};

			/**
			* Get the number of failed requests.
			*
			* A failed request is when the request_frame method is called while no
			* frame is present in the buffer.
			* The number is reset when a frame is added.
			*/
			unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src);

			/**
			* 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 second.
			*/
			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
			*
			* This function is equivalent to av_buffersrc_add_frame_flags() with the
			* AV_BUFFERSRC_FLAG_KEEP_REF flag.
			*/
			av_warn_unused_result
			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.
			*
			* This function is equivalent to av_buffersrc_add_frame_flags() without the
			* AV_BUFFERSRC_FLAG_KEEP_REF flag.
			*/
			av_warn_unused_result
			int av_buffersrc_add_frame(AVFilterContext ctx, AVFrame frame);

			/**
			* Add a frame to the buffer source.
			*
			* By default, if the frame is reference-counted, this function will take
			* ownership of the reference(s) and reset the frame. This can be controlled
			* using the flags.
			*
			* If this function returns an error, the input frame is not touched.
			*
			* @param buffer_src pointer to a buffer source context
			* @param frame a frame, or NULL to mark EOF
			* @param flags a combination of AV_BUFFERSRC_FLAG_*
			* @return >= 0 in case of success, a negative AVERROR code
			* in case of failure
			*/
			av_warn_unused_result
			int av_buffersrc_add_frame_flags(AVFilterContext *buffer_src,
			AVFrame *frame, int flags);

			/**
			* Close the buffer source after EOF.
			*
			* This is similar to passing NULL to av_buffersrc_add_frame_flags()
			* except it takes the timestamp of the EOF, i.e. the timestamp of the end
			* of the last frame.
			*/
			int av_buffersrc_close(AVFilterContext *ctx, int64_t pts, unsigned flags);

			/**
			* @}
			*/

			#endif /* AVFILTER_BUFFERSRC_H */