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https://github.com/nyanmisaka/ffmpeg-rockchip.git
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672 lines
24 KiB
C
672 lines
24 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 Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 AVFILTER_AVFILTER_H
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#define AVFILTER_AVFILTER_H
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#include "libavutil/avutil.h"
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#include "libavutil/log.h"
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#include "libavutil/samplefmt.h"
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#include "libavutil/pixfmt.h"
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#include "libavutil/rational.h"
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#include "libavcodec/avcodec.h"
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#include <stddef.h>
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#include "libavfilter/version.h"
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/**
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* Return the LIBAVFILTER_VERSION_INT constant.
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*/
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unsigned avfilter_version(void);
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/**
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* Return the libavfilter build-time configuration.
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*/
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const char *avfilter_configuration(void);
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/**
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* Return the libavfilter license.
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*/
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const char *avfilter_license(void);
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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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typedef struct AVFilterFormats AVFilterFormats;
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/**
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* A reference-counted buffer 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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* AVFilterBufferRef structure below.
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*/
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typedef struct AVFilterBuffer {
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uint8_t *data[8]; ///< buffer data for each plane/channel
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/**
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* pointers to the data planes/channels.
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*
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* For video, this should simply point to data[].
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*
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* For planar audio, each channel has a separate data pointer, and
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* linesize[0] contains the size of each channel buffer.
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* For packed audio, there is just one data pointer, and linesize[0]
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* contains the total size of the buffer for all channels.
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*
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* Note: Both data and extended_data will always be set, but for planar
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* audio with more channels that can fit in data, extended_data must be used
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* in order to access all channels.
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*/
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uint8_t **extended_data;
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int linesize[8]; ///< number of bytes per line
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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 buffer 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 AVFilterBuffer *buf);
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int format; ///< media format
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int w, h; ///< width and height of the allocated buffer
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unsigned refcount; ///< number of references to this buffer
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} AVFilterBuffer;
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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, with the same contents each time
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#define AV_PERM_REUSE2 0x10 ///< can output the buffer multiple times, modified each time
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#define AV_PERM_NEG_LINESIZES 0x20 ///< the buffer requested can have negative linesizes
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/**
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* Audio specific properties in a reference to an AVFilterBuffer. Since
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* AVFilterBufferRef is common to different media formats, audio specific
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* per reference properties must be separated out.
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*/
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typedef struct AVFilterBufferRefAudioProps {
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uint64_t channel_layout; ///< channel layout of audio buffer
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int nb_samples; ///< number of audio samples
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int sample_rate; ///< audio buffer sample rate
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int planar; ///< audio buffer - planar or packed
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} AVFilterBufferRefAudioProps;
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/**
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* Video specific properties in a reference to an AVFilterBuffer. Since
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* AVFilterBufferRef is common to different media formats, video specific
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* per reference properties must be separated out.
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*/
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typedef struct AVFilterBufferRefVideoProps {
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int w; ///< image width
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int h; ///< image height
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AVRational pixel_aspect; ///< pixel aspect ratio
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int interlaced; ///< is frame interlaced
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int top_field_first; ///< field order
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enum AVPictureType pict_type; ///< picture type of the frame
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int key_frame; ///< 1 -> keyframe, 0-> not
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} AVFilterBufferRefVideoProps;
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/**
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* A reference to an AVFilterBuffer. Since filters can manipulate the origin of
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* a buffer to, for example, crop image without any memcpy, the buffer 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 AVFilterBufferRef {
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AVFilterBuffer *buf; ///< the buffer that this is a reference to
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uint8_t *data[8]; ///< picture/audio data for each plane
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/**
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* pointers to the data planes/channels.
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*
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* For video, this should simply point to data[].
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*
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* For planar audio, each channel has a separate data pointer, and
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* linesize[0] contains the size of each channel buffer.
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* For packed audio, there is just one data pointer, and linesize[0]
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* contains the total size of the buffer for all channels.
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*
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* Note: Both data and extended_data will always be set, but for planar
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* audio with more channels that can fit in data, extended_data must be used
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* in order to access all channels.
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*/
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uint8_t **extended_data;
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int linesize[8]; ///< number of bytes per line
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AVFilterBufferRefVideoProps *video; ///< video buffer specific properties
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AVFilterBufferRefAudioProps *audio; ///< audio buffer specific properties
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/**
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* presentation timestamp. The time unit may change during
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* filtering, as it is specified in the link and the filter code
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* may need to rescale the PTS accordingly.
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*/
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int64_t pts;
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int64_t pos; ///< byte position in stream, -1 if unknown
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int format; ///< media format
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int perms; ///< permissions, see the AV_PERM_* flags
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enum AVMediaType type; ///< media type of buffer data
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} AVFilterBufferRef;
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/**
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* Copy properties of src to dst, without copying the actual data
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*/
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void avfilter_copy_buffer_ref_props(AVFilterBufferRef *dst, AVFilterBufferRef *src);
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/**
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* Add a new reference to a buffer.
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*
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* @param ref an existing reference to the buffer
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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 buffer 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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AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask);
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/**
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* Remove a reference to a buffer. If this is the last reference to the
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* buffer, the buffer itself is also automatically freed.
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*
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* @param ref reference to the buffer, may be NULL
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*/
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void avfilter_unref_buffer(AVFilterBufferRef *ref);
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#if FF_API_AVFILTERPAD_PUBLIC
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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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* @warning this struct will be removed from public API.
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* users should call avfilter_pad_get_name() and avfilter_pad_get_type()
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* to access the name and type fields; there should be no need to access
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* any other fields from outside of libavfilter.
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*/
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struct AVFilterPad {
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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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const char *name;
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/**
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* AVFilterPad type.
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*/
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enum AVMediaType type;
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/**
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* Minimum required permissions on incoming buffers. Any buffer with
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* insufficient permissions will be automatically copied by the filter
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* system to a new buffer which provides the needed access permissions.
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*
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* Input pads only.
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*/
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int min_perms;
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/**
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* Permissions which are not accepted on incoming buffers. Any buffer
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* which has any of these permissions set will be automatically copied
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* by the filter system to a new buffer which does not have those
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* permissions. This can be used to easily disallow buffers with
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* AV_PERM_REUSE.
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*
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* Input pads only.
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*/
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int rej_perms;
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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, AVFilterBufferRef *picref);
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/**
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* Callback function to get a video buffer. If NULL, the filter system will
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* use avfilter_default_get_video_buffer().
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*
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* Input video pads only.
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*/
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AVFilterBufferRef *(*get_video_buffer)(AVFilterLink *link, int perms, int w, int h);
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/**
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* Callback function to get an audio buffer. If NULL, the filter system will
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* use avfilter_default_get_audio_buffer().
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*
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* Input audio pads only.
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*/
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AVFilterBufferRef *(*get_audio_buffer)(AVFilterLink *link, int perms,
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int nb_samples);
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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, int slice_dir);
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/**
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* Samples filtering callback. This is where a filter receives audio data
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* and should do its processing.
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*
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* Input audio pads only.
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*/
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void (*filter_samples)(AVFilterLink *link, AVFilterBufferRef *samplesref);
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/**
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* Frame poll callback. This returns the number of immediately available
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* samples. It should return a positive value if the next request_frame()
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* is guaranteed to return one frame (with no delay).
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*
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* Defaults to just calling the source poll_frame() method.
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*
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* Output pads only.
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*/
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int (*poll_frame)(AVFilterLink *link);
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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 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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* The filter expects a fifo to be inserted on its input link,
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* typically because it has a delay.
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*
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* input pads only.
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*/
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int needs_fifo;
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};
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#endif
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/**
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* Get the name of an AVFilterPad.
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*
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* @param pads an array of AVFilterPads
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* @param pad_idx index of the pad in the array it; is the caller's
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* responsibility to ensure the index is valid
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*
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* @return name of the pad_idx'th pad in pads
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*/
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const char *avfilter_pad_get_name(AVFilterPad *pads, int pad_idx);
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/**
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* Get the type of an AVFilterPad.
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*
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* @param pads an array of AVFilterPads
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* @param pad_idx index of the pad in the array; it is the caller's
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* responsibility to ensure the index is valid
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*
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* @return type of the pad_idx'th pad in pads
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*/
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enum AVMediaType avfilter_pad_get_type(AVFilterPad *pads, int pad_idx);
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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 AVFilter {
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const char *name; ///< filter name
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/**
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* A description for the filter. You should use the
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* NULL_IF_CONFIG_SMALL() macro to define it.
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*/
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const char *description;
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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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/*****************************************************************
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* All fields below this line are not part of the public API. They
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* may not be used outside of libavfilter and can be changed and
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* removed at will.
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* New public fields should be added right above.
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*****************************************************************
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*/
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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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*/
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int (*init)(AVFilterContext *ctx, const char *args);
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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 buffer 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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/**
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* Queries formats supported by the filter and its pads, and sets the
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* in_formats for links connected to its output pads, and out_formats
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* for links connected to its input pads.
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*
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* @return zero on success, a negative value corresponding to an
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* AVERROR code otherwise
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*/
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int (*query_formats)(AVFilterContext *);
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int priv_size; ///< size of private data to allocate for the filter
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} AVFilter;
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/** An instance of a filter */
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struct AVFilterContext {
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const 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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AVFilterPad *input_pads; ///< array of input pads
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AVFilterLink **inputs; ///< array of pointers to input links
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#if FF_API_FOO_COUNT
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unsigned input_count; ///< @deprecated use nb_inputs
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#endif
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unsigned nb_inputs; ///< number of input 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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#if FF_API_FOO_COUNT
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unsigned output_count; ///< @deprecated use nb_outputs
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#endif
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unsigned nb_outputs; ///< number of output pads
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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 link between two filters. This contains pointers to the source and
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* destination filters between which this link exists, and the indexes 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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AVFilterContext *src; ///< source filter
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AVFilterPad *srcpad; ///< output pad on the source filter
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AVFilterContext *dst; ///< dest filter
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AVFilterPad *dstpad; ///< input pad on the dest filter
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enum AVMediaType type; ///< filter media type
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/* These parameters apply only to video */
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int w; ///< agreed upon image width
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int h; ///< agreed upon image height
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AVRational sample_aspect_ratio; ///< agreed upon sample aspect ratio
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/* These two parameters apply only to audio */
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uint64_t channel_layout; ///< channel layout of current buffer (see libavutil/audioconvert.h)
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int sample_rate; ///< samples per second
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int format; ///< agreed upon media format
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/**
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* Define the time base used by the PTS of the frames/samples
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* which will pass through this link.
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* During the configuration stage, each filter is supposed to
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* change only the output timebase, while the timebase of the
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* input link is assumed to be an unchangeable property.
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*/
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AVRational time_base;
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/*****************************************************************
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* All fields below this line are not part of the public API. They
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* may not be used outside of libavfilter and can be changed and
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* removed at will.
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* New public fields should be added right above.
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*****************************************************************
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*/
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/**
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* Lists of formats supported by the input and output filters respectively.
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* These lists are used for negotiating the format to actually be used,
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* which will be loaded into the format member, above, when chosen.
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*/
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AVFilterFormats *in_formats;
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AVFilterFormats *out_formats;
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/**
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* Lists of channel layouts and sample rates used for automatic
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* negotiation.
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*/
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AVFilterFormats *in_samplerates;
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AVFilterFormats *out_samplerates;
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struct AVFilterChannelLayouts *in_channel_layouts;
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struct AVFilterChannelLayouts *out_channel_layouts;
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/**
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* Audio only, the destination filter sets this to a non-zero value to
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* request that buffers with the given number of samples should be sent to
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* it. AVFilterPad.needs_fifo must also be set on the corresponding input
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* pad.
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* Last buffer before EOF will be padded with silence.
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*/
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int request_samples;
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/** stage of the initialization of the link properties (dimensions, etc) */
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enum {
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AVLINK_UNINIT = 0, ///< not started
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AVLINK_STARTINIT, ///< started, but incomplete
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AVLINK_INIT ///< complete
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} init_state;
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/**
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* The buffer reference currently being sent across the link by the source
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* filter. This is used internally by the filter system to allow
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* automatic copying of buffers which do not have sufficient permissions
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* for the destination. This should not be accessed directly by the
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* filters.
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*/
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AVFilterBufferRef *src_buf;
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AVFilterBufferRef *cur_buf;
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AVFilterBufferRef *out_buf;
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};
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/**
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* Link two filters together.
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*
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* @param src the source filter
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* @param srcpad index of the output pad on the source filter
|
|
* @param dst the destination filter
|
|
* @param dstpad index of the input pad on the destination filter
|
|
* @return zero on success
|
|
*/
|
|
int avfilter_link(AVFilterContext *src, unsigned srcpad,
|
|
AVFilterContext *dst, unsigned dstpad);
|
|
|
|
/**
|
|
* 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 avfilter_config_links(AVFilterContext *filter);
|
|
|
|
/**
|
|
* Create a buffer reference wrapped around an already allocated image
|
|
* buffer.
|
|
*
|
|
* @param data pointers to the planes of the image to reference
|
|
* @param linesize linesizes for the planes of the image to reference
|
|
* @param perms the required access permissions
|
|
* @param w the width of the image specified by the data and linesize arrays
|
|
* @param h the height of the image specified by the data and linesize arrays
|
|
* @param format the pixel format of the image specified by the data and linesize arrays
|
|
*/
|
|
AVFilterBufferRef *
|
|
avfilter_get_video_buffer_ref_from_arrays(uint8_t *data[4], int linesize[4], int perms,
|
|
int w, int h, enum PixelFormat format);
|
|
|
|
/**
|
|
* Create an audio buffer reference wrapped around an already
|
|
* allocated samples buffer.
|
|
*
|
|
* @param data pointers to the samples plane buffers
|
|
* @param linesize linesize for the samples plane buffers
|
|
* @param perms the required access permissions
|
|
* @param nb_samples number of samples per channel
|
|
* @param sample_fmt the format of each sample in the buffer to allocate
|
|
* @param channel_layout the channel layout of the buffer
|
|
*/
|
|
AVFilterBufferRef *avfilter_get_audio_buffer_ref_from_arrays(uint8_t **data,
|
|
int linesize,
|
|
int perms,
|
|
int nb_samples,
|
|
enum AVSampleFormat sample_fmt,
|
|
uint64_t channel_layout);
|
|
|
|
/** Initialize the filter system. Register all builtin filters. */
|
|
void avfilter_register_all(void);
|
|
|
|
/** Uninitialize the filter system. Unregister all filters. */
|
|
void avfilter_uninit(void);
|
|
|
|
/**
|
|
* Register a filter. This is only needed if you plan to use
|
|
* avfilter_get_by_name later to lookup the AVFilter structure by name. A
|
|
* filter can still by instantiated with avfilter_open even if it is not
|
|
* registered.
|
|
*
|
|
* @param filter the filter to register
|
|
* @return 0 if the registration was succesfull, a negative value
|
|
* otherwise
|
|
*/
|
|
int avfilter_register(AVFilter *filter);
|
|
|
|
/**
|
|
* Get a filter definition matching the given name.
|
|
*
|
|
* @param name the filter name to find
|
|
* @return the filter definition, if any matching one is registered.
|
|
* NULL if none found.
|
|
*/
|
|
AVFilter *avfilter_get_by_name(const char *name);
|
|
|
|
/**
|
|
* If filter is NULL, returns a pointer to the first registered filter pointer,
|
|
* if filter is non-NULL, returns the next pointer after filter.
|
|
* If the returned pointer points to NULL, the last registered filter
|
|
* was already reached.
|
|
*/
|
|
AVFilter **av_filter_next(AVFilter **filter);
|
|
|
|
/**
|
|
* Create a filter instance.
|
|
*
|
|
* @param filter_ctx put here a pointer to the created filter context
|
|
* on success, NULL on failure
|
|
* @param filter the filter to create an instance of
|
|
* @param inst_name Name to give to the new instance. Can be NULL for none.
|
|
* @return >= 0 in case of success, a negative error code otherwise
|
|
*/
|
|
int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name);
|
|
|
|
/**
|
|
* Initialize a filter.
|
|
*
|
|
* @param filter the filter to initialize
|
|
* @param args A string of parameters to use when initializing the filter.
|
|
* The format and meaning of this string varies by filter.
|
|
* @param opaque Any extra non-string data needed by the filter. The meaning
|
|
* of this parameter varies by filter.
|
|
* @return zero on success
|
|
*/
|
|
int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque);
|
|
|
|
/**
|
|
* Free a filter context.
|
|
*
|
|
* @param filter the filter to free
|
|
*/
|
|
void avfilter_free(AVFilterContext *filter);
|
|
|
|
/**
|
|
* Insert a filter in the middle of an existing link.
|
|
*
|
|
* @param link the link into which the filter should be inserted
|
|
* @param filt the filter to be inserted
|
|
* @param filt_srcpad_idx the input pad on the filter to connect
|
|
* @param filt_dstpad_idx the output pad on the filter to connect
|
|
* @return zero on success
|
|
*/
|
|
int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
|
|
unsigned filt_srcpad_idx, unsigned filt_dstpad_idx);
|
|
|
|
/**
|
|
* Copy the frame properties of src to dst, without copying the actual
|
|
* image data.
|
|
*
|
|
* @return 0 on success, a negative number on error.
|
|
*/
|
|
int avfilter_copy_frame_props(AVFilterBufferRef *dst, const AVFrame *src);
|
|
|
|
/**
|
|
* Copy the frame properties and data pointers of src to dst, without copying
|
|
* the actual data.
|
|
*
|
|
* @return 0 on success, a negative number on error.
|
|
*/
|
|
int avfilter_copy_buf_props(AVFrame *dst, const AVFilterBufferRef *src);
|
|
|
|
#endif /* AVFILTER_AVFILTER_H */
|