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/*
* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* 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.
* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* 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 |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVFILTER_BUFFERSRC_H
#define AVFILTER_BUFFERSRC_H
/**
* @file |
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* @ingroup lavfi_buffersrc |
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* Memory buffer source API.
*/
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#include "libavcodec/avcodec.h" |
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#include "avfilter.h"
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/**
* @defgroup lavfi_buffersrc Buffer source API
* @ingroup lavfi
* @{
*/
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enum {
/**
* Do not check for format changes.
*/
AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT = 1,
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/**
* Immediately push the frame to the output.
*/
AV_BUFFERSRC_FLAG_PUSH = 4,
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/**
* 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,
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};
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/**
* 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);
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/** |
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* Add a frame to the buffer source.
* |
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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
* function will make a new reference to it. Otherwise the frame data will be
* copied. |
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* |
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* @return 0 on success, a negative AVERROR on error |
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*
* This function is equivalent to av_buffersrc_add_frame_flags() with the
* AV_BUFFERSRC_FLAG_KEEP_REF flag. |
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*/ |
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av_warn_unused_result |
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int av_buffersrc_write_frame(AVFilterContext *ctx, const AVFrame *frame); |
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/**
* Add a frame to the buffer source.
* |
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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
* 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. |
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*
* This function is equivalent to av_buffersrc_add_frame_flags() without the
* AV_BUFFERSRC_FLAG_KEEP_REF flag. |
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*/ |
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av_warn_unused_result |
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int av_buffersrc_add_frame(AVFilterContext *ctx, AVFrame *frame);
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/** |
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* Add a frame to the buffer source.
*
* By default, if the frame is reference-counted, this function will take |
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* ownership of the reference(s) and reset the frame. This can be controlled |
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* using the flags.
*
* If this function returns an error, the input frame is not touched. |
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*
* @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
*/ |
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av_warn_unused_result |
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int av_buffersrc_add_frame_flags(AVFilterContext *buffer_src,
AVFrame *frame, int flags);
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/** |
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* @}
*/
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#endif /* AVFILTER_BUFFERSRC_H */ |