/*
* 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_INTERNAL_H
#define AVFILTER_INTERNAL_H
/**
* @file
* internal API functions
*/
#include "libavutil/internal.h"
#include "avfilter.h"
#include "formats.h"
#include "framepool.h"
#include "framequeue.h"
#include "thread.h"
#include "version.h"
#include "video.h"
#include "libavcodec/avcodec.h"
#include "libavcodec/internal.h"
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;
/**
* Update the position of a link in the age heap.
*/
void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link);
/**
* A filter pad used for either input or output.
*/
struct AVFilterPad {
/**
* Pad name. The name is unique among inputs and among outputs, but an
* input may have the same name as an output. This may be NULL if this
* pad has no need to ever be referenced by name.
*/
const char *name;
/**
* AVFilterPad type.
*/
enum AVMediaType type;
/**
* Callback function to get a video buffer. If NULL, the filter system will
* use ff_default_get_video_buffer().
*
* Input video pads only.
*/
AVFrame *(*get_video_buffer)(AVFilterLink *link, int w, int h);
/**
* Callback function to get an audio buffer. If NULL, the filter system will
* use ff_default_get_audio_buffer().
*
* Input audio pads only.
*/
AVFrame *(*get_audio_buffer)(AVFilterLink *link, int nb_samples);
/**
* Filtering callback. This is where a filter receives a frame with
* audio/video data and should do its processing.
*
* Input pads only.
*
* @return >= 0 on success, a negative AVERROR on error. This function
* must ensure that frame is properly unreferenced on error if it
* hasn't been passed on to another filter.
*/
int (*filter_frame)(AVFilterLink *link, AVFrame *frame);
/**
* Frame poll callback. This returns the number of immediately available
* samples. It should return a positive value if the next request_frame()
* is guaranteed to return one frame (with no delay).
*
* Defaults to just calling the source poll_frame() method.
*
* Output pads only.
*/
int (*poll_frame)(AVFilterLink *link);
/**
* Frame request callback. A call to this should result in some progress
* towards producing output over the given link. This should return zero
* on success, and another value on error.
*
* Output pads only.
*/
int (*request_frame)(AVFilterLink *link);
/**
* Link configuration callback.
*
* For output pads, this should set the link properties such as
* width/height. This should NOT set the format property - that is
* negotiated between filters by the filter system using the
* query_formats() callback before this function is called.
*
* For input pads, this should check the properties of the link, and update
* the filter's internal state as necessary.
*
* For both input and output filters, this should return zero on success,
* and another value on error.
*/
int (*config_props)(AVFilterLink *link);
/**
* The filter expects a fifo to be inserted on its input link,
* typically because it has a delay.
*
* input pads only.
*/
int needs_fifo;
/**
* The filter expects writable frames from its input link,
* duplicating data buffers if needed.
*
* input pads only.
*/
int needs_writable;
};
struct AVFilterGraphInternal {
void *thread;
avfilter_execute_func *thread_execute;
FFFrameQueueGlobal frame_queues;
};
struct AVFilterInternal {
avfilter_execute_func *execute;
};
/**
* Tell if an integer is contained in the provided -1-terminated list of integers.
* This is useful for determining (for instance) if an AVPixelFormat is in an
* array of supported formats.
*
* @param fmt provided format
* @param fmts -1-terminated list of formats
* @return 1 if present, 0 if absent
*/
int ff_fmt_is_in(int fmt, const int *fmts);
/* Functions to parse audio format arguments */
/**
* Parse a pixel format.
*
* @param ret pixel format pointer to where the value should be written
* @param arg string to parse
* @param log_ctx log context
* @return >= 0 in case of success, a negative AVERROR code on error
*/
av_warn_unused_result
int ff_parse_pixel_format(enum AVPixelFormat *ret, const char *arg, void *log_ctx);
/**
* Parse a sample rate.
*
* @param ret unsigned integer pointer to where the value should be written
* @param arg string to parse
* @param log_ctx log context
* @return >= 0 in case of success, a negative AVERROR code on error
*/
av_warn_unused_result
int ff_parse_sample_rate(int *ret, const char *arg, void *log_ctx);
/**
* Parse a time base.
*
* @param ret unsigned AVRational pointer to where the value should be written
* @param arg string to parse
* @param log_ctx log context
* @return >= 0 in case of success, a negative AVERROR code on error
*/
av_warn_unused_result
int ff_parse_time_base(AVRational *ret, const char *arg, void *log_ctx);
/**
* Parse a sample format name or a corresponding integer representation.
*
* @param ret integer pointer to where the value should be written
* @param arg string to parse
* @param log_ctx log context
* @return >= 0 in case of success, a negative AVERROR code on error
*/
av_warn_unused_result
int ff_parse_sample_format(int *ret, const char *arg, void *log_ctx);
/**
* Parse a channel layout or a corresponding integer representation.
*
* @param ret 64bit integer pointer to where the value should be written.
* @param nret integer pointer to the number of channels;
* if not NULL, then unknown channel layouts are accepted
* @param arg string to parse
* @param log_ctx log context
* @return >= 0 in case of success, a negative AVERROR code on error
*/
av_warn_unused_result
int ff_parse_channel_layout(int64_t *ret, int *nret, const char *arg,
void *log_ctx);
void ff_update_link_current_pts(AVFilterLink *link, int64_t pts);
/**
* Set the status field of a link from the source filter.
* The pts should reflect the timestamp of the status change,
* in link time base and relative to the frames timeline.
* In particular, for AVERROR_EOF, it should reflect the
* end time of the last frame.
*/
void ff_avfilter_link_set_in_status(AVFilterLink *link, int status, int64_t pts);
/**
* Set the status field of a link from the destination filter.
* The pts should probably be left unset (AV_NOPTS_VALUE).
*/
void ff_avfilter_link_set_out_status(AVFilterLink *link, int status, int64_t pts);
void ff_command_queue_pop(AVFilterContext *filter);
/* misc trace functions */
#define FF_TPRINTF_START(ctx, func) ff_tlog(NULL, "%-16s: ", #func)
char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms);
void ff_tlog_ref(void *ctx, AVFrame *ref, int end);
void ff_tlog_link(void *ctx, AVFilterLink *link, int end);
/**
* Insert a new pad.
*
* @param idx Insertion point. Pad is inserted at the end if this point
* is beyond the end of the list of pads.
* @param count Pointer to the number of pads in the list
* @param padidx_off Offset within an AVFilterLink structure to the element
* to increment when inserting a new pad causes link
* numbering to change
* @param pads Pointer to the pointer to the beginning of the list of pads
* @param links Pointer to the pointer to the beginning of the list of links
* @param newpad The new pad to add. A copy is made when adding.
* @return >= 0 in case of success, a negative AVERROR code on error
*/
int ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
AVFilterPad **pads, AVFilterLink ***links,
AVFilterPad *newpad);
/** Insert a new input pad for the filter. */
static inline int ff_insert_inpad(AVFilterContext *f, unsigned index,
AVFilterPad *p)
{
return ff_insert_pad(index, &f->nb_inputs, offsetof(AVFilterLink, dstpad),
&f->input_pads, &f->inputs, p);
}
/** Insert a new output pad for the filter. */
static inline int ff_insert_outpad(AVFilterContext *f, unsigned index,
AVFilterPad *p)
{
return ff_insert_pad(index, &f->nb_outputs, offsetof(AVFilterLink, srcpad),
&f->output_pads, &f->outputs, p);
}
/**
* Poll a frame from the filter chain.
*
* @param link the input link
* @return the number of immediately available frames, a negative
* number in case of error
*/
int ff_poll_frame(AVFilterLink *link);
/**
* Request an input frame from the filter at the other end of the link.
*
* This function must not be used by filters using the activate callback,
* use ff_link_set_frame_wanted() instead.
*
* The input filter may pass the request on to its inputs, fulfill the
* request from an internal buffer or any other means specific to its function.
*
* When the end of a stream is reached AVERROR_EOF is returned and no further
* frames are returned after that.
*
* When a filter is unable to output a frame for example due to its sources
* being unable to do so or because it depends on external means pushing data
* into it then AVERROR(EAGAIN) is returned.
* It is important that a AVERROR(EAGAIN) return is returned all the way to the
* caller (generally eventually a user application) as this step may (but does
* not have to be) necessary to provide the input with the next frame.
*
* If a request is successful then some progress has been made towards
* providing a frame on the link (through ff_filter_frame()). A filter that
* needs several frames to produce one is allowed to return success if one
* more frame has been processed but no output has been produced yet. A
* filter is also allowed to simply forward a success return value.
*
* @param link the input link
* @return zero on success
* AVERROR_EOF on end of file
* AVERROR(EAGAIN) if the previous filter cannot output a frame
* currently and can neither guarantee that EOF has been reached.
*/
int ff_request_frame(AVFilterLink *link);
#define AVFILTER_DEFINE_CLASS(fname) \
static const AVClass fname##_class = { \
.class_name = #fname, \
.item_name = av_default_item_name, \
.option = fname##_options, \
.version = LIBAVUTIL_VERSION_INT, \
.category = AV_CLASS_CATEGORY_FILTER, \
}
/**
* Find the index of a link.
*
* I.e. find i such that link == ctx->(in|out)puts[i]
*/
#define FF_INLINK_IDX(link) ((int)((link)->dstpad - (link)->dst->input_pads))
#define FF_OUTLINK_IDX(link) ((int)((link)->srcpad - (link)->src->output_pads))
/**
* Send a frame of data to the next filter.
*
* @param link the output link over which the data is being sent
* @param frame a reference to the buffer of data being sent. The
* receiving filter will free this reference when it no longer
* needs it or pass it on to the next filter.
*
* @return >= 0 on success, a negative AVERROR on error. The receiving filter
* is responsible for unreferencing frame in case of error.
*/
int ff_filter_frame(AVFilterLink *link, AVFrame *frame);
/**
* 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);
int ff_filter_activate(AVFilterContext *filter);
/**
* Remove a filter from a graph;
*/
void ff_filter_graph_remove_filter(AVFilterGraph *graph, AVFilterContext *filter);
/**
* The filter is aware of hardware frames, and any hardware frame context
* should not be automatically propagated through it.
*/
#define FF_FILTER_FLAG_HWFRAME_AWARE (1 << 0)
/**
* Run one round of processing on a filter graph.
*/
int ff_filter_graph_run_once(AVFilterGraph *graph);
/**
* Normalize the qscale factor
* FIXME the H264 qscale is a log based scale, mpeg1/2 is not, the code below
* cannot be optimal
*/
static inline int ff_norm_qscale(int qscale, int type)
{
switch (type) {
case FF_QSCALE_TYPE_MPEG1: return qscale;
case FF_QSCALE_TYPE_MPEG2: return qscale >> 1;
case FF_QSCALE_TYPE_H264: return qscale >> 2;
case FF_QSCALE_TYPE_VP56: return (63 - qscale + 2) >> 2;
}
return qscale;
}
/**
* Get number of threads for current filter instance.
* This number is always same or less than graph->nb_threads.
*/
int ff_filter_get_nb_threads(AVFilterContext *ctx);
#endif /* AVFILTER_INTERNAL_H */