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- /*
- *
- * 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 */
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