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72f6d6317c
work than it's worth. Commited in SoC by Bobby Bingham on 2007-08-17 14:39:11 Originally committed as revision 12096 to svn://svn.ffmpeg.org/ffmpeg/trunk
436 lines
16 KiB
C
436 lines
16 KiB
C
/*
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* Filter layer
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* copyright (c) 2007 Bobby Bingham
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef FFMPEG_AVFILTER_H
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#define FFMPEG_AVFILTER_H
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#include <stddef.h>
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#include "avcodec.h"
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typedef struct AVFilterContext AVFilterContext;
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typedef struct AVFilterLink AVFilterLink;
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typedef struct AVFilterPad AVFilterPad;
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/* TODO: look for other flags which may be useful in this structure (interlace
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* flags, etc)
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*/
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/**
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* A reference-counted picture data type used by the filter system. Filters
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* should not store pointers to this structure directly, but instead use the
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* AVFilterPicRef structure below
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*/
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typedef struct AVFilterPic
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{
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uint8_t *data[4]; ///< picture data for each plane
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int linesize[4]; ///< number of bytes per line
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enum PixelFormat format; ///< colorspace
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unsigned refcount; ///< number of references to this image
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/** private data to be used by a custom free function */
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void *priv;
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/**
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* A pointer to the function to deallocate this image if the default
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* function is not sufficient. This could, for example, add the memory
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* back into a memory pool to be reused later without the overhead of
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* reallocating it from scratch.
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*/
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void (*free)(struct AVFilterPic *pic);
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} AVFilterPic;
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/**
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* A reference to an AVFilterPic. Since filters can manipulate the origin of
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* a picture to, for example, crop image without any memcpy, the picture origin
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* and dimensions are per-reference properties. Linesize is also useful for
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* image flipping, frame to field filters, etc, and so is also per-reference.
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*
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* TODO: add anything necessary for frame reordering
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*/
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typedef struct AVFilterPicRef
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{
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AVFilterPic *pic; ///< the picture that this is a reference to
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uint8_t *data[4]; ///< picture data for each plane
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int linesize[4]; ///< number of bytes per line
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int w; ///< image width
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int h; ///< image height
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int64_t pts; ///< presentation timestamp in milliseconds
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int perms; ///< permissions
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#define AV_PERM_READ 0x01 ///< can read from the buffer
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#define AV_PERM_WRITE 0x02 ///< can write to the buffer
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#define AV_PERM_PRESERVE 0x04 ///< nobody else can overwrite the buffer
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#define AV_PERM_REUSE 0x08 ///< can output the buffer multiple times
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} AVFilterPicRef;
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/**
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* Add a new reference to a picture.
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* @param ref An existing reference to the picture
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* @param pmask A bitmask containing the allowable permissions in the new
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* reference
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* @return A new reference to the picture with the same properties as the
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* old, excluding any permissions denied by pmask
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*/
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AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, int pmask);
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/**
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* Remove a reference to a picture. If this is the last reference to the
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* picture, the picture itself is also automatically freed.
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* @param ref Reference to the picture.
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*/
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void avfilter_unref_pic(AVFilterPicRef *ref);
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/**
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* A filter pad used for either input or output
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*/
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struct AVFilterPad
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{
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/**
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* Pad name. The name is unique among inputs and among outputs, but an
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* input may have the same name as an output. This may be NULL if this
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* pad has no need to ever be referenced by name.
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*/
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char *name;
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/**
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* AVFilterPad type. Only video supported now, hopefully someone will
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* add audio in the future.
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*/
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int type;
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#define AV_PAD_VIDEO 0 ///< video pad
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/**
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* Callback to get a list of supported formats. The returned list should
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* be terminated by -1 (see avfilter_make_format_list for an easy way to
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* create such a list).
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*
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* This is used for both input and output pads. If ommitted from an output
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* pad, it is assumed that the only format supported is the same format
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* that is being used for the filter's first input. If the filter has no
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* inputs, then this may not be ommitted for its output pads.
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*/
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int *(*query_formats)(AVFilterLink *link);
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/**
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* Callback called before passing the first slice of a new frame. If
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* NULL, the filter layer will default to storing a reference to the
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* picture inside the link structure.
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*
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* Input video pads only.
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*/
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void (*start_frame)(AVFilterLink *link, AVFilterPicRef *picref);
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/**
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* Callback function to get a buffer. If NULL, the filter system will
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* handle buffer requests.
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*
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* Input video pads only.
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*/
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AVFilterPicRef *(*get_video_buffer)(AVFilterLink *link, int perms);
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/**
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* Callback called after the slices of a frame are completely sent. If
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* NULL, the filter layer will default to releasing the reference stored
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* in the link structure during start_frame().
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*
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* Input video pads only.
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*/
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void (*end_frame)(AVFilterLink *link);
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/**
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* Slice drawing callback. This is where a filter receives video data
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* and should do its processing.
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*
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* Input video pads only.
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*/
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void (*draw_slice)(AVFilterLink *link, int y, int height);
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/**
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* Frame request callback. A call to this should result in at least one
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* frame being output over the given link. This should return zero on
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* success, and another value on error.
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*
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* Output video pads only.
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*/
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int (*request_frame)(AVFilterLink *link);
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/**
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* Link configuration callback.
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*
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* For output pads, this should set the link properties such as
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* width/height. This should NOT set the format property - that is
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* negotiated between filters by the filter system using the
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* query_formats() callback before this function is called.
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*
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* For input pads, this should check the properties of the link, and update
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* the filter's internal state as necessary.
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*
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* For both input and output filters, this should return zero on success,
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* and another value on error.
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*/
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int (*config_props)(AVFilterLink *link);
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};
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/** Default handler for start_frame() for video inputs */
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void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref);
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/** Default handler for end_frame() for video inputs */
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void avfilter_default_end_frame(AVFilterLink *link);
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/** Default handler for config_props() for video outputs */
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int avfilter_default_config_output_link(AVFilterLink *link);
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/** Default handler for config_props() for video inputs */
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int avfilter_default_config_input_link (AVFilterLink *link);
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/** Default handler for query_formats() for video outputs */
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int *avfilter_default_query_output_formats(AVFilterLink *link);
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/** Default handler for get_video_buffer() for video inputs */
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AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link,
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int perms);
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/**
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* Filter definition. This defines the pads a filter contains, and all the
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* callback functions used to interact with the filter.
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*/
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typedef struct
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{
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char *name; ///< filter name
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char *author; ///< filter author
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int priv_size; ///< size of private data to allocate for the filter
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/**
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* Filter initialization function. Args contains the user-supplied
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* parameters. FIXME: maybe an AVOption-based system would be better?
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* opaque is data provided by the code requesting creation of the filter,
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* and is used to pass data to the filter.
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*/
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int (*init)(AVFilterContext *ctx, const char *args, void *opaque);
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/**
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* Filter uninitialization function. Should deallocate any memory held
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* by the filter, release any picture references, etc. This does not need
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* to deallocate the AVFilterContext->priv memory itself.
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*/
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void (*uninit)(AVFilterContext *ctx);
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const AVFilterPad *inputs; ///< NULL terminated list of inputs. NULL if none
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const AVFilterPad *outputs; ///< NULL terminated list of outputs. NULL if none
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} AVFilter;
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/** An instance of a filter */
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struct AVFilterContext
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{
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AVClass *av_class; ///< Needed for av_log()
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AVFilter *filter; ///< The AVFilter of which this is an instance
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char *name; ///< name of this filter instance
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unsigned input_count; ///< number of input pads
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AVFilterPad *input_pads; ///< array of input pads
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AVFilterLink **inputs; ///< array of pointers to input links
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unsigned output_count; ///< number of output pads
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AVFilterPad *output_pads; ///< array of output pads
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AVFilterLink **outputs; ///< array of pointers to output links
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void *priv; ///< private data for use by the filter
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};
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/**
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* A links between two filters. This contains pointers to the source and
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* destination filters between which this link exists, and the indices of
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* the pads involved. In addition, this link also contains the parameters
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* which have been negotiated and agreed upon between the filter, such as
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* image dimensions, format, etc
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*/
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struct AVFilterLink
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{
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AVFilterContext *src; ///< source filter
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unsigned int srcpad; ///< index of the output pad on the source filter
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AVFilterContext *dst; ///< dest filter
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unsigned int dstpad; ///< index of the input pad on the dest filter
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int w; ///< agreed upon image width
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int h; ///< agreed upon image height
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enum PixelFormat format; ///< agreed upon image colorspace
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AVFilterPicRef *cur_pic;
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AVFilterPicRef *outpic;
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};
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/**
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* Link two filters together
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* @param src The source filter
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* @param srcpad Index of the output pad on the source filter
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* @param dst The destination filter
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* @param dstpad Index of the input pad on the destination filter
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* @return Zero on success
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*/
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int avfilter_link(AVFilterContext *src, unsigned srcpad,
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AVFilterContext *dst, unsigned dstpad);
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/**
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* Negotiate the colorspace, dimensions, etc of a link
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* @param link The link to negotiate the properties of
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* @return Zero on successful negotiation
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*/
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int avfilter_config_link(AVFilterLink *link);
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/**
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* Request a picture buffer with a specific set of permissions
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* @param link The output link to the filter from which the picture will
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* be requested
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* @param perms The required access permissions
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* @return A reference to the picture. This must be unreferenced with
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* avfilter_unref_pic when you are finished with it.
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*/
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AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms);
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/**
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* Request an input frame from the filter at the other end of the link.
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* @param link The input link
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* @return Zero on success
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*/
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int avfilter_request_frame(AVFilterLink *link);
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/**
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* Notofy the next filter of the start of a frame.
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* @param link The output link the frame will be sent over
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* @param picref A reference to the frame about to be sent. The data for this
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* frame need only be valid once draw_slice() is called for that
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* portion. The receiving filter will free this reference when
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* it no longer needs it.
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*/
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void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref);
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/**
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* Notify the next filter that the current frame has finished
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* @param link The output link the frame was sent over
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*/
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void avfilter_end_frame(AVFilterLink *link);
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/**
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* Send a slice to the next filter
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* @param link The output link over which the frame is being sent
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* @param y Offset in pixels from the top of the image for this slice
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* @param h Height of this slice in pixels
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*/
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void avfilter_draw_slice(AVFilterLink *link, int y, int h);
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/** Initialize the filter system. Registers all builtin filters */
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void avfilter_init(void);
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/** Uninitialize the filter system. Unregisters all filters */
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void avfilter_uninit(void);
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/**
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* Register a filter. This is only needed if you plan to create an instance of
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* this filter by name later with avfilter_create_by_name. A filter can still
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* by created with acfilter_create even if it is not registered.
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* @param filter The filter to register
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*/
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void avfilter_register(AVFilter *filter);
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/**
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* Gets a filter definition matching the given name
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* @param name The filter name to find
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* @return The filter definition, if any matching one is registered.
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* NULL if none found.
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*/
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AVFilter *avfilter_get_by_name(char *name);
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/**
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* Create a filter instance
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* @param filter The filter to create an instance of
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* @param inst_name Name to give to the new instance. Can be NULL for none.
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* @return Pointer to the new instance on success. NULL on failure.
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*/
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AVFilterContext *avfilter_create(AVFilter *filter, char *inst_name);
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/**
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* Creates a filter instace
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* @param name The name of the filter type which is to be instantiated
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* @param inst_name Name to give to the new instance. Can be NULL for none.
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* @return Pointer to the new instance on success. NULL in failure.
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*/
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AVFilterContext *avfilter_create_by_name(char *name, char *inst_name);
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/**
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* Initialize a filter
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* @param filter The filter to initialize
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* @param args A string of parameters to use when initializing the filter.
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* The format and meaning of this string varies by filter.
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* @param opaque Any extra non-string data needed by the filter. The meaning
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* of this parameter varies by filter.
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* @return Zero on success
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*/
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int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque);
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/**
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* Destroy a filter
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* @param filter The filter to destroy
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*/
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void avfilter_destroy(AVFilterContext *filter);
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/**
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* Helper function to create a list of supported formats. This is intended
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* for use in AVFilterPad->query_formats().
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* @param len The number of formats supported
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* @param ... A list of the supported formats
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* @return The format list in a form suitable for returning from
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* AVFilterPad->query_formats()
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*/
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int *avfilter_make_format_list(int len, ...);
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/**
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* Insert a new pad
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* @param idx Insertion point. Pad is inserted at the end if this point
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* is beyond the end of the list of pads.
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* @param count Pointer to the number of pads in the list
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* @param padidx_off Offset within an AVFilterLink structure to the element
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* to increment when inserting a new pad causes link
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* numbering to change
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* @param pads Pointer to the pointer to the beginning of the list of pads
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* @param links Pointer to the pointer to the beginning of the list of links
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* @param newpad The new pad to add. A copy is made when adding.
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*/
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void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
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AVFilterPad **pads, AVFilterLink ***links,
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AVFilterPad *newpad);
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/** insert a new input pad for the filter */
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static inline void avfilter_insert_inpad(AVFilterContext *f, unsigned index,
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AVFilterPad *p)
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{
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avfilter_insert_pad(index, &f->input_count, offsetof(AVFilterLink, dstpad),
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&f->input_pads, &f->inputs, p);
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}
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/** insert a new output pad for the filter */
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static inline void avfilter_insert_outpad(AVFilterContext *f, unsigned index,
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AVFilterPad *p)
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{
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avfilter_insert_pad(index, &f->output_count, offsetof(AVFilterLink, srcpad),
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&f->output_pads, &f->outputs, p);
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}
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#endif /* FFMPEG_AVFILTER_H */
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