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53319d5c93
Compared to dualinput, this API can handle more than two inputs and can generate frames synchronized to any or all input streams.
297 lines
7.3 KiB
C
297 lines
7.3 KiB
C
/*
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* Copyright (c) 2013 Nicolas George
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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
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* 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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* 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
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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 License
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* along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVFILTER_FRAMESYNC_H
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#define AVFILTER_FRAMESYNC_H
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#include "bufferqueue.h"
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/*
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* TODO
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* Callback-based API similar to dualinput.
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* Export convenient options.
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*/
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/**
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* This API is intended as a helper for filters that have several video
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* input and need to combine them somehow. If the inputs have different or
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* variable frame rate, getting the input frames to match requires a rather
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* complex logic and a few user-tunable options.
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*
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* In this API, when a set of synchronized input frames is ready to be
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* procesed is called a frame event. Frame event can be generated in
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* response to input frames on any or all inputs and the handling of
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* situations where some stream extend beyond the beginning or the end of
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* others can be configured.
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*
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* The basic working of this API is the following:
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*
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* - When a frame is available on any input, add it using
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* ff_framesync_add_frame().
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*
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* - When a frame event is ready to be processed (i.e. after adding a frame
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* or when requested on input):
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* - call ff_framesync_next();
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* - if fs->frame_ready is true, process the frames;
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* - call ff_framesync_drop().
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*/
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/**
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* Stream extrapolation mode
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*
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* Describe how the frames of a stream are extrapolated before the first one
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* and after EOF to keep sync with possibly longer other streams.
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*/
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enum FFFrameSyncExtMode {
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/**
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* Completely stop all streams with this one.
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*/
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EXT_STOP,
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/**
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* Ignore this stream and continue processing the other ones.
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*/
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EXT_NULL,
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/**
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* Extend the frame to infinity.
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*/
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EXT_INFINITY,
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};
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/**
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* Input stream structure
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*/
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typedef struct FFFrameSyncIn {
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/**
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* Queue of incoming AVFrame, and NULL to mark EOF
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*/
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struct FFBufQueue queue;
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/**
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* Extrapolation mode for timestamps before the first frame
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*/
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enum FFFrameSyncExtMode before;
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/**
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* Extrapolation mode for timestamps after the last frame
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*/
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enum FFFrameSyncExtMode after;
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/**
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* Time base for the incoming frames
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*/
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AVRational time_base;
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/**
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* Current frame, may be NULL before the first one or after EOF
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*/
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AVFrame *frame;
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/**
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* Next frame, for internal use
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*/
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AVFrame *frame_next;
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/**
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* PTS of the current frame
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*/
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int64_t pts;
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/**
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* PTS of the next frame, for internal use
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*/
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int64_t pts_next;
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/**
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* Boolean flagging the next frame, for internal use
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*/
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uint8_t have_next;
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/**
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* State: before first, in stream or after EOF, for internal use
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*/
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uint8_t state;
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/**
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* Synchronization level: frames on input at the highest sync level will
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* generate output frame events.
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*
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* For example, if inputs #0 and #1 have sync level 2 and input #2 has
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* sync level 1, then a frame on either input #0 or #1 will generate a
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* frame event, but not a frame on input #2 until both inputs #0 and #1
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* have reached EOF.
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*
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* If sync is 0, no frame event will be generated.
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*/
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unsigned sync;
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} FFFrameSyncIn;
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/**
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* Frame sync structure.
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*/
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typedef struct FFFrameSync {
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const AVClass *class;
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void *parent;
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/**
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* Number of input streams
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*/
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unsigned nb_in;
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/**
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* Time base for the output events
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*/
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AVRational time_base;
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/**
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* Timestamp of the current event
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*/
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int64_t pts;
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/**
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* Callback called when a frame event is ready
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*/
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int (*on_event)(struct FFFrameSync *fs);
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/**
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* Opaque pointer, not used by the API
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*/
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void *opaque;
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/**
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* Index of the input that requires a request
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*/
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unsigned in_request;
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/**
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* Synchronization level: only inputs with the same sync level are sync
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* sources.
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*/
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unsigned sync_level;
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/**
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* Flag indicating that a frame event is ready
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*/
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uint8_t frame_ready;
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/**
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* Flag indicating that output has reached EOF.
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*/
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uint8_t eof;
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/**
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* Array of inputs; all inputs must be in consecutive memory
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*/
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FFFrameSyncIn in[1]; /* must be the last field */
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} FFFrameSync;
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/**
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* Initialize a frame sync structure.
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*
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* The entire structure is expected to be already set to 0.
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*
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* @param fs frame sync structure to initialize
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* @param parent parent object, used for logging
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* @param nb_in number of inputs
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*/
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void ff_framesync_init(FFFrameSync *fs, void *parent, unsigned nb_in);
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/**
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* Configure a frame sync structure.
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*
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* Must be called after all options are set but before all use.
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*
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* @return >= 0 for success or a negative error code
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*/
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int ff_framesync_configure(FFFrameSync *fs);
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/**
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* Free all memory currently allocated.
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*/
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void ff_framesync_uninit(FFFrameSync *fs);
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/**
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* Add a frame to an input
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*
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* Typically called from the filter_frame() method.
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*
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* @param fs frame sync structure
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* @param in index of the input
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* @param frame input frame, or NULL for EOF
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*/
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int ff_framesync_add_frame(FFFrameSync *fs, unsigned in, AVFrame *frame);
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/**
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* Prepare the next frame event.
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*
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* The status of the operation can be found in fs->frame_ready and fs->eof.
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*/
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void ff_framesync_next(FFFrameSync *fs);
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/**
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* Drop the current frame event.
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*/
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void ff_framesync_drop(FFFrameSync *fs);
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/**
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* Get the current frame in an input.
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*
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* @param fs frame sync structure
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* @param in index of the input
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* @param rframe used to return the current frame (or NULL)
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* @param get if not zero, the calling code needs to get ownership of
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* the returned frame; the current frame will either be
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* duplicated or removed from the framesync structure
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*/
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int ff_framesync_get_frame(FFFrameSync *fs, unsigned in, AVFrame **rframe,
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unsigned get);
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/**
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* Process one or several frame using the on_event callback.
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*
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* @return number of frames processed or negative error code
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*/
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int ff_framesync_process_frame(FFFrameSync *fs, unsigned all);
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/**
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* Accept a frame on a filter input.
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*
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* This function can be the complete implementation of all filter_frame
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* methods of a filter using framesync.
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*/
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int ff_framesync_filter_frame(FFFrameSync *fs, AVFilterLink *inlink,
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AVFrame *in);
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/**
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* Request a frame on the filter output.
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*
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* This function can be the complete implementation of all filter_frame
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* methods of a filter using framesync if it has only one output.
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*/
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int ff_framesync_request_frame(FFFrameSync *fs, AVFilterLink *outlink);
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#endif /* AVFILTER_FRAMESYNC_H */
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