mirror of https://git.ffmpeg.org/ffmpeg.git
215 lines
6.9 KiB
C
215 lines
6.9 KiB
C
/*
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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_INTERNAL_H
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#define AVFILTER_INTERNAL_H
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/**
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* @file
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* internal API functions
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*/
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#include "avfilter.h"
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#if !FF_API_AVFILTERPAD_PUBLIC
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/**
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* A filter pad used for either input or output.
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*/
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struct AVFilterPad {
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/**
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* Pad name. The name is unique among inputs and among outputs, but an
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* input may have the same name as an output. This may be NULL if this
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* pad has no need to ever be referenced by name.
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*/
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const char *name;
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/**
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* AVFilterPad type.
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*/
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enum AVMediaType type;
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/**
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* Callback function to get a video buffer. If NULL, the filter system will
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* use avfilter_default_get_video_buffer().
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*
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* Input video pads only.
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*/
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AVFrame *(*get_video_buffer)(AVFilterLink *link, int w, int h);
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/**
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* Callback function to get an audio buffer. If NULL, the filter system will
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* use avfilter_default_get_audio_buffer().
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*
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* Input audio pads only.
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*/
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AVFrame *(*get_audio_buffer)(AVFilterLink *link, int nb_samples);
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/**
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* Filtering callback. This is where a filter receives a frame with
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* audio/video data and should do its processing.
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*
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* Input pads only.
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*
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* @return >= 0 on success, a negative AVERROR on error. This function
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* must ensure that samplesref is properly unreferenced on error if it
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* hasn't been passed on to another filter.
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*/
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int (*filter_frame)(AVFilterLink *link, AVFrame *frame);
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/**
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* Frame poll callback. This returns the number of immediately available
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* samples. It should return a positive value if the next request_frame()
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* is guaranteed to return one frame (with no delay).
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*
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* Defaults to just calling the source poll_frame() method.
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*
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* Output pads only.
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*/
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int (*poll_frame)(AVFilterLink *link);
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/**
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* Frame request callback. A call to this should result in at least one
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* frame being output over the given link. This should return zero on
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* success, and another value on error.
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*
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* Output pads only.
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*/
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int (*request_frame)(AVFilterLink *link);
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/**
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* Link configuration callback.
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*
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* For output pads, this should set the link properties such as
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* width/height. This should NOT set the format property - that is
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* negotiated between filters by the filter system using the
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* query_formats() callback before this function is called.
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*
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* For input pads, this should check the properties of the link, and update
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* the filter's internal state as necessary.
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*
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* For both input and output filters, this should return zero on success,
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* and another value on error.
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*/
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int (*config_props)(AVFilterLink *link);
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/**
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* The filter expects a fifo to be inserted on its input link,
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* typically because it has a delay.
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*
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* input pads only.
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*/
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int needs_fifo;
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};
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#endif
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/** default handler for freeing audio/video buffer when there are no references left */
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void ff_avfilter_default_free_buffer(AVFilterBuffer *buf);
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/** Tell is a format is contained in the provided list terminated by -1. */
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int ff_fmt_is_in(int fmt, const int *fmts);
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#define FF_DPRINTF_START(ctx, func) av_dlog(NULL, "%-16s: ", #func)
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void ff_dlog_link(void *ctx, AVFilterLink *link, int end);
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/**
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* Insert a new pad.
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*
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* @param idx Insertion point. Pad is inserted at the end if this point
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* is beyond the end of the list of pads.
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* @param count Pointer to the number of pads in the list
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* @param padidx_off Offset within an AVFilterLink structure to the element
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* to increment when inserting a new pad causes link
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* numbering to change
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* @param pads Pointer to the pointer to the beginning of the list of pads
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* @param links Pointer to the pointer to the beginning of the list of links
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* @param newpad The new pad to add. A copy is made when adding.
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*/
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void ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
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AVFilterPad **pads, AVFilterLink ***links,
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AVFilterPad *newpad);
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/** Insert a new input pad for the filter. */
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static inline void ff_insert_inpad(AVFilterContext *f, unsigned index,
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AVFilterPad *p)
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{
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ff_insert_pad(index, &f->nb_inputs, offsetof(AVFilterLink, dstpad),
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&f->input_pads, &f->inputs, p);
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#if FF_API_FOO_COUNT
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f->input_count = f->nb_inputs;
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#endif
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}
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/** Insert a new output pad for the filter. */
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static inline void ff_insert_outpad(AVFilterContext *f, unsigned index,
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AVFilterPad *p)
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{
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ff_insert_pad(index, &f->nb_outputs, offsetof(AVFilterLink, srcpad),
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&f->output_pads, &f->outputs, p);
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#if FF_API_FOO_COUNT
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f->output_count = f->nb_outputs;
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#endif
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}
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/**
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* Poll a frame from the filter chain.
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*
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* @param link the input link
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* @return the number of immediately available frames, a negative
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* number in case of error
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*/
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int ff_poll_frame(AVFilterLink *link);
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/**
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* Request an input frame from the filter at the other end of the link.
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*
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* @param link the input link
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* @return zero on success
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*/
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int ff_request_frame(AVFilterLink *link);
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/**
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* Send a frame of data to the next filter.
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*
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* @param link the output link over which the data is being sent
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* @param frame a reference to the buffer of data being sent. The
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* receiving filter will free this reference when it no longer
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* needs it or pass it on to the next filter.
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*
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* @return >= 0 on success, a negative AVERROR on error. The receiving filter
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* is responsible for unreferencing frame in case of error.
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*/
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int ff_filter_frame(AVFilterLink *link, AVFrame *frame);
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/**
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* Allocate a new filter context and return it.
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*
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* @param filter what filter to create an instance of
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* @param inst_name name to give to the new filter context
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*
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* @return newly created filter context or NULL on failure
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*/
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AVFilterContext *ff_filter_alloc(const AVFilter *filter, const char *inst_name);
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/**
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* Remove a filter from a graph;
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*/
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void ff_filter_graph_remove_filter(AVFilterGraph *graph, AVFilterContext *filter);
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#endif /* AVFILTER_INTERNAL_H */
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