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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

 */

#ifndef AVFILTER_INTERNAL_H

#define AVFILTER_INTERNAL_H

/**

 * @file

 * internal API functions

 */

#include "libavutil/internal.h"

#include "avfilter.h"

#include "avfiltergraph.h"

#include "formats.h"

#include "thread.h"

#include "version.h"

#include "video.h"

#define POOL_SIZE 32

typedef struct AVFilterPool {

    AVFilterBufferRef *pic[POOL_SIZE];

    int count;

    int refcount;

    int draining;

} AVFilterPool;

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);

#if !FF_API_AVFILTERPAD_PUBLIC

/**

 * 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 samplesref 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 at least one

     * frame being 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;

};

#endif

struct AVFilterGraphInternal {

    void *thread;

    avfilter_execute_func *thread_execute;

};

struct AVFilterInternal {

    avfilter_execute_func *execute;

};

#if FF_API_AVFILTERBUFFER

/** default handler for freeing audio/video buffer when there are no references left */

void ff_avfilter_default_free_buffer(AVFilterBuffer *buf);

#endif

/** Tell is a format is contained in the provided list terminated by -1. */

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

 */

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

 */

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

 */

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

 */

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 arg string to parse

 * @param log_ctx log context

 * @return >= 0 in case of success, a negative AVERROR code on error

 */

int ff_parse_channel_layout(int64_t *ret, const char *arg, void *log_ctx);

void ff_update_link_current_pts(AVFilterLink *link, int64_t pts);

void ff_command_queue_pop(AVFilterContext *filter);

/* misc trace functions */

/* #define FF_AVFILTER_TRACE */

#ifdef FF_AVFILTER_TRACE

#    define ff_tlog(pctx, ...) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__)

#else

#    define ff_tlog(pctx, ...) do { if (0) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0)

#endif

#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)

{

    int ret = ff_insert_pad(index, &f->nb_inputs, offsetof(AVFilterLink, dstpad),

                  &f->input_pads, &f->inputs, p);

#if FF_API_FOO_COUNT

FF_DISABLE_DEPRECATION_WARNINGS

    f->input_count = f->nb_inputs;

FF_ENABLE_DEPRECATION_WARNINGS

#endif

    return ret;

}

/** Insert a new output pad for the filter. */

static inline int ff_insert_outpad(AVFilterContext *f, unsigned index,

                                    AVFilterPad *p)

{

    int ret = ff_insert_pad(index, &f->nb_outputs, offsetof(AVFilterLink, srcpad),

                  &f->output_pads, &f->outputs, p);

#if FF_API_FOO_COUNT

FF_DISABLE_DEPRECATION_WARNINGS

    f->output_count = f->nb_outputs;

FF_ENABLE_DEPRECATION_WARNINGS

#endif

    return ret;

}

/**

 * 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.

 *

 * @param link the input link

 * @return     zero on success

 */

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, \

    }

AVFilterBufferRef *ff_copy_buffer_ref(AVFilterLink *outlink,

                                      AVFilterBufferRef *ref);

/**

 * 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))

int ff_buffersink_read_compat(AVFilterContext *ctx, AVFilterBufferRef **buf);

int ff_buffersink_read_samples_compat(AVFilterContext *ctx, AVFilterBufferRef **pbuf,

                                      int nb_samples);

/**

 * 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);

/**

 * Flags for AVFilterLink.flags.

 */

enum {

    /**

     * Frame requests may need to loop in order to be fulfilled.

     * A filter must set this flags on an output link if it may return 0 in

     * request_frame() without filtering a frame.

     */

    FF_LINK_FLAG_REQUEST_LOOP = 1,

};

/**

 * 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);

#endif /* AVFILTER_INTERNAL_H */