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/*
* 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
*/
/*
* APIs internal to the generic filter(graph) layer.
*
* MUST NOT be included by individual filters.
*/
#ifndef AVFILTER_AVFILTER_INTERNAL_H
#define AVFILTER_AVFILTER_INTERNAL_H
#include <stdint.h>
#include "avfilter.h"
#include "filters.h"
#include "framequeue.h"
typedef struct FilterLinkInternal {
FilterLink l;
struct FFFramePool *frame_pool;
/**
* Queue of frames waiting to be filtered.
*/
FFFrameQueue fifo;
/**
* If set, the source filter can not generate a frame as is.
* The goal is to avoid repeatedly calling the request_frame() method on
* the same link.
*/
int frame_blocked_in;
/**
* Link input status.
* If not zero, all attempts of filter_frame will fail with the
* corresponding code.
*/
int status_in;
/**
* Timestamp of the input status change.
*/
int64_t status_in_pts;
/**
* Link output status.
* If not zero, all attempts of request_frame will fail with the
* corresponding code.
*/
int status_out;
/**
* True if a frame is currently wanted on the output of this filter.
* Set when ff_request_frame() is called by the output,
* cleared when a frame is filtered.
*/
int frame_wanted_out;
/**
* Index in the age array.
*/
int age_index;
/** stage of the initialization of the link properties (dimensions, etc) */
enum {
AVLINK_UNINIT = 0, ///< not started
AVLINK_STARTINIT, ///< started, but incomplete
AVLINK_INIT ///< complete
} init_state;
} FilterLinkInternal;
static inline FilterLinkInternal *ff_link_internal(AVFilterLink *link)
{
return (FilterLinkInternal*)link;
}
typedef struct FFFilterContext {
/**
* The public AVFilterContext. See avfilter.h for it.
*/
AVFilterContext p;
avfilter_execute_func *execute;
// AV_CLASS_STATE_FLAG_*
unsigned state_flags;
/**
* Ready status of the filter.
* A non-0 value means that the filter needs activating;
* a higher value suggests a more urgent activation.
*/
unsigned ready;
///< parsed expression
struct AVExpr *enable;
///< variable values for the enable expression
double *var_values;
struct AVFilterCommand *command_queue;
} FFFilterContext;
static inline FFFilterContext *fffilterctx(AVFilterContext *ctx)
{
return (FFFilterContext*)ctx;
}
typedef struct AVFilterCommand {
double time; ///< time expressed in seconds
char *command; ///< command
char *arg; ///< optional argument for the command
int flags;
struct AVFilterCommand *next;
} AVFilterCommand;
typedef struct FFFilterGraph {
/**
* The public AVFilterGraph. See avfilter.h for it.
*/
AVFilterGraph p;
struct FilterLinkInternal **sink_links;
int sink_links_count;
unsigned disable_auto_convert;
void *thread;
avfilter_execute_func *thread_execute;
FFFrameQueueGlobal frame_queues;
} FFFilterGraph;
static inline FFFilterGraph *fffiltergraph(AVFilterGraph *graph)
{
return (FFFilterGraph*)graph;
}
/**
* Update the position of a link in the age heap.
*/
void ff_avfilter_graph_update_heap(AVFilterGraph *graph,
struct FilterLinkInternal *li);
/**
* Allocate a new filter context and return it.
*
* @param filter what filter to create an instance of
* @param inst_name name to give to the new filter context
*
* @return newly created filter context or NULL on failure
*/
AVFilterContext *ff_filter_alloc(const AVFilter *filter, const char *inst_name);
/**
* Remove a filter from a graph;
*/
void ff_filter_graph_remove_filter(AVFilterGraph *graph, AVFilterContext *filter);
int ff_filter_activate(AVFilterContext *filter);
/**
* Parse filter options into a dictionary.
*
* @param logctx context for logging
* @param priv_class a filter's private class for shorthand options or NULL
* @param options dictionary to store parsed options in
* @param args options string to parse
*
* @return a non-negative number on success, a negative error code on failure
*/
int ff_filter_opt_parse(void *logctx, const AVClass *priv_class,
AVDictionary **options, const char *args);
int ff_graph_thread_init(FFFilterGraph *graph);
void ff_graph_thread_free(FFFilterGraph *graph);
/**
* Negotiate the media format, dimensions, etc of all inputs to a filter.
*
* @param filter the filter to negotiate the properties for its inputs
* @return zero on successful negotiation
*/
int ff_filter_config_links(AVFilterContext *filter);
/* misc trace functions */
#define FF_TPRINTF_START(ctx, func) ff_tlog(NULL, "%-16s: ", #func)
#ifdef TRACE
void ff_tlog_link(void *ctx, AVFilterLink *link, int end);
#else
#define ff_tlog_link(ctx, link, end) do { } while(0)
#endif
/**
* Run one round of processing on a filter graph.
*/
int ff_filter_graph_run_once(AVFilterGraph *graph);
/**
* Process the commands queued in the link up to the time of the frame.
* Commands will trigger the process_command() callback.
* @return >= 0 or AVERROR code.
*/
int ff_inlink_process_commands(AVFilterLink *link, const AVFrame *frame);
#endif /* AVFILTER_AVFILTER_INTERNAL_H */
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