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b0012de420
The PUSH flags is necessary for efficient scheduling; otherwise there is no feedback when adding frames to closed paths. The NO_CHECK_FORMAT is a small optimization that does not cost much to implement. The KEEP_REF flag maps to the add/write distinction in the fork's API.
149 lines
4.6 KiB
C
149 lines
4.6 KiB
C
/*
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*
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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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* Memory buffer source API.
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*/
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#include "libavcodec/avcodec.h"
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#include "avfilter.h"
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enum {
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/**
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* Do not check for format changes.
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*/
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AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT = 1,
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#if FF_API_AVFILTERBUFFER
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/**
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* Ignored
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*/
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AV_BUFFERSRC_FLAG_NO_COPY = 2,
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#endif
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/**
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* Immediately push the frame to the output.
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*/
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AV_BUFFERSRC_FLAG_PUSH = 4,
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/**
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* Keep a reference to the frame.
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* If the frame if reference-counted, create a new reference; otherwise
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* copy the frame data.
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*/
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AV_BUFFERSRC_FLAG_KEEP_REF = 8,
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};
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/**
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* Add buffer data in picref to buffer_src.
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*
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* @param buffer_src pointer to a buffer source context
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* @param picref a buffer reference, or NULL to mark EOF
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* @param flags a combination of AV_BUFFERSRC_FLAG_*
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* @return >= 0 in case of success, a negative AVERROR code
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* in case of failure
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*/
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int av_buffersrc_add_ref(AVFilterContext *buffer_src,
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AVFilterBufferRef *picref, int flags);
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/**
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* Get the number of failed requests.
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*
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* A failed request is when the request_frame method is called while no
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* frame is present in the buffer.
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* The number is reset when a frame is added.
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*/
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unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src);
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#if FF_API_AVFILTERBUFFER
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/**
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* Add a buffer to the filtergraph s.
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*
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* @param buf buffer containing frame data to be passed down the filtergraph.
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* This function will take ownership of buf, the user must not free it.
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* A NULL buf signals EOF -- i.e. no more frames will be sent to this filter.
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*
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* @deprecated use av_buffersrc_write_frame() or av_buffersrc_add_frame()
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*/
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attribute_deprecated
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int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf);
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#endif
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/**
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* Add a frame to the buffer source.
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*
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* @param s 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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* This function is equivalent to av_buffersrc_add_frame_flags() with the
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* AV_BUFFERSRC_FLAG_KEEP_REF flag.
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*/
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int av_buffersrc_write_frame(AVFilterContext *s, 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 s 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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* This function is equivalent to av_buffersrc_add_frame_flags() without the
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* AV_BUFFERSRC_FLAG_KEEP_REF flag.
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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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* Add a frame to the buffer source.
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*
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* 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 controled
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* using the flags.
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*
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* If this function returns an error, the input frame is not touched.
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*
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* @param buffer_src pointer to a buffer source context
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* @param frame a frame, or NULL to mark EOF
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* @param flags a combination of AV_BUFFERSRC_FLAG_*
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* @return >= 0 in case of success, a negative AVERROR code
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* in case of failure
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*/
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int av_buffersrc_add_frame_flags(AVFilterContext *buffer_src,
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AVFrame *frame, int flags);
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#endif /* AVFILTER_BUFFERSRC_H */
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