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Slices allowed filtering or drawing video in horizontal bands or blocks. This allowed working on the video in smaller units. In theory, this could bring a performance win by lowering cache pressure, as you didn't have to keep the whole video frame in cache while filtering, only the slice. In practice, the slice code path was barely used for the following reasons: - Multithreaded decoding with ffmpeg didn't use slices. The ffmpeg slice callback was disabled, because it can be called from another thread, and the mplayer video chain is not thread-safe. - There was nothing that would turn "full" images into appropriate slices, so slices were rarely used. - Most filters didn't actually support slices. On the other hand, supporting slices lead to code duplication and more complex code in general. I made some experiments and didn't find any actual measurable performance improvements when using slices. Even ffmpeg removed slices based filtering from libavfilter in favor of simpler code. The most broken thing about the slices code path is that slices can't be queued, like it is done for images in vo.c.
162 lines
6.0 KiB
C
162 lines
6.0 KiB
C
/*
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* This file is part of MPlayer.
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*
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* MPlayer is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* MPlayer 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MPLAYER_MP_IMAGE_H
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#define MPLAYER_MP_IMAGE_H
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <inttypes.h>
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#include "core/mp_msg.h"
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#include "csputils.h"
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// Minimum stride alignment in pixels
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#define MP_STRIDE_ALIGNMENT 32
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//--------- codec's requirements (filled by the codec/vf) ---------
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//--- buffer content restrictions:
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// set if buffer content shouldn't be modified:
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#define MP_IMGFLAG_PRESERVE 0x01
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// set if buffer content will be READ.
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// This can be e.g. for next frame's MC: (I/P mpeg frames) -
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// then in combination with MP_IMGFLAG_PRESERVE - or it
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// can be because a video filter or codec will read a significant
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// amount of data while processing that frame (e.g. blending something
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// onto the frame, MV based intra prediction).
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// A frame marked like this should not be placed in to uncachable
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// video RAM for example.
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#define MP_IMGFLAG_READABLE 0x02
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//--- buffer width/stride/plane restrictions: (used for direct rendering)
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// stride _have_to_ be aligned to MB boundary: [for DR restrictions]
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#define MP_IMGFLAG_ACCEPT_ALIGNED_STRIDE 0x4
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// stride should be aligned to MB boundary: [for buffer allocation]
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#define MP_IMGFLAG_PREFER_ALIGNED_STRIDE 0x8
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// codec accept any stride (>=width):
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#define MP_IMGFLAG_ACCEPT_STRIDE 0x10
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// codec accept any width (width*bpp=stride -> stride%bpp==0) (>=width):
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#define MP_IMGFLAG_ACCEPT_WIDTH 0x20
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//--- for planar formats only:
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// uses only stride[0], and stride[1]=stride[2]=stride[0]>>mpi->chroma_x_shift
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#define MP_IMGFLAG_COMMON_STRIDE 0x40
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// uses only planes[0], and calculates planes[1,2] from width,height,imgfmt
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#define MP_IMGFLAG_COMMON_PLANE 0x80
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#define MP_IMGFLAGMASK_RESTRICTIONS 0xFF
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//--------- color info (filled by mp_image_setfmt() ) -----------
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// set if number of planes > 1
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#define MP_IMGFLAG_PLANAR 0x100
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// set if it's YUV colorspace
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#define MP_IMGFLAG_YUV 0x200
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// set if it's swapped (BGR or YVU) plane/byteorder
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#define MP_IMGFLAG_SWAPPED 0x400
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// set if you want memory for palette allocated and managed by vf_get_image etc.
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#define MP_IMGFLAG_RGB_PALETTE 0x800
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#define MP_IMGFLAGMASK_COLORS 0xF00
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// set if it's in video buffer/memory: [set by vo/vf's get_image() !!!]
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#define MP_IMGFLAG_DIRECT 0x2000
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// set if buffer is allocated (used in destination images):
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#define MP_IMGFLAG_ALLOCATED 0x4000
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// buffer type was printed (do NOT set this flag - it's for INTERNAL USE!!!)
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#define MP_IMGFLAG_TYPE_DISPLAYED 0x8000
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// codec doesn't support any form of direct rendering - it has own buffer
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// allocation. so we just export its buffer pointers:
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#define MP_IMGTYPE_EXPORT 0
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// codec requires a static WO buffer, but it does only partial updates later:
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#define MP_IMGTYPE_STATIC 1
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// codec just needs some WO memory, where it writes/copies the whole frame to:
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#define MP_IMGTYPE_TEMP 2
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// I+P type, requires 2+ independent static R/W buffers
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#define MP_IMGTYPE_IP 3
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// I+P+B type, requires 2+ independent static R/W and 1+ temp WO buffers
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#define MP_IMGTYPE_IPB 4
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// Upper 16 bits give desired buffer number, -1 means get next available
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#define MP_IMGTYPE_NUMBERED 5
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#define MP_MAX_PLANES 4
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#define MP_IMGFIELD_ORDERED 0x01
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#define MP_IMGFIELD_TOP_FIRST 0x02
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#define MP_IMGFIELD_REPEAT_FIRST 0x04
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#define MP_IMGFIELD_TOP 0x08
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#define MP_IMGFIELD_BOTTOM 0x10
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#define MP_IMGFIELD_INTERLACED 0x20
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typedef struct mp_image {
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unsigned int flags;
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unsigned char type;
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int number;
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unsigned char bpp; // bits/pixel. NOT depth! for RGB it will be n*8
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unsigned int imgfmt;
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int width,height; // internal to vf.c, do not use (stored dimensions)
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int w,h; // visible dimensions
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int display_w,display_h; // if set (!= 0), anamorphic size
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uint8_t *planes[MP_MAX_PLANES];
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int stride[MP_MAX_PLANES];
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char * qscale;
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int qstride;
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int pict_type; // 0->unknown, 1->I, 2->P, 3->B
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int fields;
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int qscale_type; // 0->mpeg1/4/h263, 1->mpeg2
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int num_planes;
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/* these are only used by planar formats Y,U(Cb),V(Cr) */
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int chroma_width;
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int chroma_height;
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int chroma_x_shift; // horizontal
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int chroma_y_shift; // vertical
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enum mp_csp colorspace;
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enum mp_csp_levels levels;
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int usage_count;
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/* for private use by filter or vo driver (to store buffer id or dmpi) */
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void* priv;
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} mp_image_t;
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void mp_image_setfmt(mp_image_t* mpi,unsigned int out_fmt);
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mp_image_t* new_mp_image(int w,int h);
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void free_mp_image(mp_image_t* mpi);
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mp_image_t* alloc_mpi(int w, int h, unsigned long int fmt);
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void mp_image_alloc_planes(mp_image_t *mpi);
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void copy_mpi(mp_image_t *dmpi, mp_image_t *mpi);
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enum mp_csp mp_image_csp(struct mp_image *img);
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enum mp_csp_levels mp_image_levels(struct mp_image *img);
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struct mp_csp_details;
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void mp_image_set_colorspace_details(struct mp_image *image,
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struct mp_csp_details *csp);
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// this macro requires img_format.h to be included too:
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#define MP_IMAGE_PLANAR_BITS_PER_PIXEL_ON_PLANE(mpi, p) \
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(IMGFMT_IS_YUVP16((mpi)->imgfmt) ? 16 : 8)
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#define MP_IMAGE_BITS_PER_PIXEL_ON_PLANE(mpi, p) \
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(((mpi)->flags & MP_IMGFLAG_PLANAR) \
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? MP_IMAGE_PLANAR_BITS_PER_PIXEL_ON_PLANE(mpi, p) \
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: (mpi)->bpp)
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#define MP_IMAGE_BYTES_PER_ROW_ON_PLANE(mpi, p) \
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((MP_IMAGE_BITS_PER_PIXEL_ON_PLANE(mpi, p) * ((mpi)->w >> (p ? mpi->chroma_x_shift : 0)) + 7) / 8)
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#endif /* MPLAYER_MP_IMAGE_H */
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