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