/* * filter layer * Copyright (c) 2007 Bobby Bingham * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVFILTER_AVFILTER_H#define AVFILTER_AVFILTER_H /** * @file * @ingroup lavfi * Main libavfilter public API header */ /** * @defgroup lavfi Libavfilter - graph-based frame editing library * @{ */ #include "libavutil/attributes.h"#include "libavutil/avutil.h"#include "libavutil/frame.h"#include "libavutil/log.h"#include "libavutil/samplefmt.h"#include "libavutil/pixfmt.h"#include "libavutil/rational.h"#include "libavcodec/avcodec.h" #include <stddef.h> #include "libavfilter/version.h" /** * Return the LIBAVFILTER_VERSION_INT constant. */unsigned avfilter_version(void); /** * Return the libavfilter build-time configuration. */const char *avfilter_configuration(void); /** * Return the libavfilter license. */const char *avfilter_license(void);  typedef struct AVFilterContext AVFilterContext;typedef struct AVFilterLink    AVFilterLink;typedef struct AVFilterPad     AVFilterPad;typedef struct AVFilterFormats AVFilterFormats; #if FF_API_AVFILTERBUFFER/** * A reference-counted buffer data type used by the filter system. Filters * should not store pointers to this structure directly, but instead use the * AVFilterBufferRef structure below. */typedef struct AVFilterBuffer {    uint8_t *data[8];           ///< buffer data for each plane/channel     /**     * pointers to the data planes/channels.     *     * For video, this should simply point to data[].     *     * For planar audio, each channel has a separate data pointer, and     * linesize[0] contains the size of each channel buffer.     * For packed audio, there is just one data pointer, and linesize[0]     * contains the total size of the buffer for all channels.     *     * Note: Both data and extended_data will always be set, but for planar     * audio with more channels that can fit in data, extended_data must be used     * in order to access all channels.     */    uint8_t **extended_data;    int linesize[8];            ///< number of bytes per line     /** private data to be used by a custom free function */    void *priv;    /**     * A pointer to the function to deallocate this buffer if the default     * function is not sufficient. This could, for example, add the memory     * back into a memory pool to be reused later without the overhead of     * reallocating it from scratch.     */    void (*free)(struct AVFilterBuffer *buf);     int format;                 ///< media format    int w, h;                   ///< width and height of the allocated buffer    unsigned refcount;          ///< number of references to this buffer} AVFilterBuffer; #define AV_PERM_READ     0x01   ///< can read from the buffer#define AV_PERM_WRITE    0x02   ///< can write to the buffer#define AV_PERM_PRESERVE 0x04   ///< nobody else can overwrite the buffer#define AV_PERM_REUSE    0x08   ///< can output the buffer multiple times, with the same contents each time#define AV_PERM_REUSE2   0x10   ///< can output the buffer multiple times, modified each time#define AV_PERM_NEG_LINESIZES 0x20  ///< the buffer requested can have negative linesizes /** * Audio specific properties in a reference to an AVFilterBuffer. Since * AVFilterBufferRef is common to different media formats, audio specific * per reference properties must be separated out. */typedef struct AVFilterBufferRefAudioProps {    uint64_t channel_layout;    ///< channel layout of audio buffer    int nb_samples;             ///< number of audio samples    int sample_rate;            ///< audio buffer sample rate    int planar;                 ///< audio buffer - planar or packed} AVFilterBufferRefAudioProps; /** * Video specific properties in a reference to an AVFilterBuffer. Since * AVFilterBufferRef is common to different media formats, video specific * per reference properties must be separated out. */typedef struct AVFilterBufferRefVideoProps {    int w;                      ///< image width    int h;                      ///< image height    AVRational pixel_aspect;    ///< pixel aspect ratio    int interlaced;             ///< is frame interlaced    int top_field_first;        ///< field order    enum AVPictureType pict_type; ///< picture type of the frame    int key_frame;              ///< 1 -> keyframe, 0-> not} AVFilterBufferRefVideoProps; /** * A reference to an AVFilterBuffer. Since filters can manipulate the origin of * a buffer to, for example, crop image without any memcpy, the buffer origin * and dimensions are per-reference properties. Linesize is also useful for * image flipping, frame to field filters, etc, and so is also per-reference. * * TODO: add anything necessary for frame reordering */typedef struct AVFilterBufferRef {    AVFilterBuffer *buf;        ///< the buffer that this is a reference to    uint8_t *data[8];           ///< picture/audio data for each plane    /**     * pointers to the data planes/channels.     *     * For video, this should simply point to data[].     *     * For planar audio, each channel has a separate data pointer, and     * linesize[0] contains the size of each channel buffer.     * For packed audio, there is just one data pointer, and linesize[0]     * contains the total size of the buffer for all channels.     *     * Note: Both data and extended_data will always be set, but for planar     * audio with more channels that can fit in data, extended_data must be used     * in order to access all channels.     */    uint8_t **extended_data;    int linesize[8];            ///< number of bytes per line     AVFilterBufferRefVideoProps *video; ///< video buffer specific properties    AVFilterBufferRefAudioProps *audio; ///< audio buffer specific properties     /**     * presentation timestamp. The time unit may change during     * filtering, as it is specified in the link and the filter code     * may need to rescale the PTS accordingly.     */    int64_t pts;    int64_t pos;                ///< byte position in stream, -1 if unknown     int format;                 ///< media format     int perms;                  ///< permissions, see the AV_PERM_* flags     enum AVMediaType type;      ///< media type of buffer data} AVFilterBufferRef; /** * Copy properties of src to dst, without copying the actual data */attribute_deprecatedvoid avfilter_copy_buffer_ref_props(AVFilterBufferRef *dst, AVFilterBufferRef *src); /** * Add a new reference to a buffer. * * @param ref   an existing reference to the buffer * @param pmask a bitmask containing the allowable permissions in the new *              reference * @return      a new reference to the buffer with the same properties as the *              old, excluding any permissions denied by pmask */attribute_deprecatedAVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask); /** * Remove a reference to a buffer. If this is the last reference to the * buffer, the buffer itself is also automatically freed. * * @param ref reference to the buffer, may be NULL * * @note it is recommended to use avfilter_unref_bufferp() instead of this * function */attribute_deprecatedvoid avfilter_unref_buffer(AVFilterBufferRef *ref); /** * Remove a reference to a buffer and set the pointer to NULL. * If this is the last reference to the buffer, the buffer itself * is also automatically freed. * * @param ref pointer to the buffer reference */attribute_deprecatedvoid avfilter_unref_bufferp(AVFilterBufferRef **ref);#endif #if FF_API_AVFILTERPAD_PUBLIC/** * A filter pad used for either input or output. * * @warning this struct will be removed from public API. * users should call avfilter_pad_get_name() and avfilter_pad_get_type() * to access the name and type fields; there should be no need to access * any other fields from outside of libavfilter. */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;     /**     * Minimum required permissions on incoming buffers. Any buffer with     * insufficient permissions will be automatically copied by the filter     * system to a new buffer which provides the needed access permissions.     *     * Input pads only.     */    attribute_deprecated int min_perms;     /**     * Permissions which are not accepted on incoming buffers. Any buffer     * which has any of these permissions set will be automatically copied     * by the filter system to a new buffer which does not have those     * permissions. This can be used to easily disallow buffers with     * AV_PERM_REUSE.     *     * Input pads only.     */    attribute_deprecated int rej_perms;     /**     * @deprecated unused     */    int (*start_frame)(AVFilterLink *link, AVFilterBufferRef *picref);     /**     * Callback function to get a video buffer. If NULL, the filter system will     * use avfilter_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 avfilter_default_get_audio_buffer().     *     * Input audio pads only.     */    AVFrame *(*get_audio_buffer)(AVFilterLink *link, int nb_samples);     /**     * @deprecated unused     */    int (*end_frame)(AVFilterLink *link);     /**     * @deprecated unused     */    int (*draw_slice)(AVFilterLink *link, int y, int height, int slice_dir);     /**     * 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;     /**     * The filter expects writable frames from its input link,     * duplicating data buffers if needed.     *     * input pads only.     */    int needs_writable;};#endif /** * Get the number of elements in a NULL-terminated array of AVFilterPads (e.g. * AVFilter.inputs/outputs). */int avfilter_pad_count(const AVFilterPad *pads); /** * Get the name of an AVFilterPad. * * @param pads an array of AVFilterPads * @param pad_idx index of the pad in the array it; is the caller's *                responsibility to ensure the index is valid * * @return name of the pad_idx'th pad in pads */const char *avfilter_pad_get_name(const AVFilterPad *pads, int pad_idx); /** * Get the type of an AVFilterPad. * * @param pads an array of AVFilterPads * @param pad_idx index of the pad in the array; it is the caller's *                responsibility to ensure the index is valid * * @return type of the pad_idx'th pad in pads */enum AVMediaType avfilter_pad_get_type(const AVFilterPad *pads, int pad_idx); /** * The number of the filter inputs is not determined just by AVFilter.inputs. * The filter might add additional inputs during initialization depending on the * options supplied to it. */#define AVFILTER_FLAG_DYNAMIC_INPUTS        (1 << 0)/** * The number of the filter outputs is not determined just by AVFilter.outputs. * The filter might add additional outputs during initialization depending on * the options supplied to it. */#define AVFILTER_FLAG_DYNAMIC_OUTPUTS       (1 << 1)/** * The filter supports multithreading by splitting frames into multiple parts * and processing them concurrently. */#define AVFILTER_FLAG_SLICE_THREADS         (1 << 2) /** * Filter definition. This defines the pads a filter contains, and all the * callback functions used to interact with the filter. */typedef struct AVFilter {    /**     * Filter name. Must be non-NULL and unique among filters.     */    const char *name;     /**     * A description of the filter. May be NULL.     *     * You should use the NULL_IF_CONFIG_SMALL() macro to define it.     */    const char *description;     /**     * List of inputs, terminated by a zeroed element.     *     * NULL if there are no (static) inputs. Instances of filters with     * AVFILTER_FLAG_DYNAMIC_INPUTS set may have more inputs than present in     * this list.     */    const AVFilterPad *inputs;    /**     * List of outputs, terminated by a zeroed element.     *     * NULL if there are no (static) outputs. Instances of filters with     * AVFILTER_FLAG_DYNAMIC_OUTPUTS set may have more outputs than present in     * this list.     */    const AVFilterPad *outputs;     /**     * A class for the private data, used to declare filter private AVOptions.     * This field is NULL for filters that do not declare any options.     *     * If this field is non-NULL, the first member of the filter private data     * must be a pointer to AVClass, which will be set by libavfilter generic     * code to this class.     */    const AVClass *priv_class;     /**     * A combination of AVFILTER_FLAG_*     */    int flags;     /*****************************************************************     * All fields below this line are not part of the public API. They     * may not be used outside of libavfilter and can be changed and     * removed at will.     * New public fields should be added right above.     *****************************************************************     */     /**     * Filter initialization function.     *     * This callback will be called only once during the filter lifetime, after     * all the options have been set, but before links between filters are     * established and format negotiation is done.     *     * Basic filter initialization should be done here. Filters with dynamic     * inputs and/or outputs should create those inputs/outputs here based on     * provided options. No more changes to this filter's inputs/outputs can be     * done after this callback.     *     * This callback must not assume that the filter links exist or frame     * parameters are known.     *     * @ref AVFilter.uninit "uninit" is guaranteed to be called even if     * initialization fails, so this callback does not have to clean up on     * failure.     *     * @return 0 on success, a negative AVERROR on failure     */    int (*init)(AVFilterContext *ctx);     /**     * Should be set instead of @ref AVFilter.init "init" by the filters that     * want to pass a dictionary of AVOptions to nested contexts that are     * allocated during init.

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