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FFmpeg/libavutil/pixdesc.c

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/*
* pixel format descriptor
* Copyright (c) 2009 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <string.h>
#include "pixfmt.h"
#include "pixdesc.h"
#include "intreadwrite.h"
void av_read_image_line(uint16_t *dst, const uint8_t *data[4], const int linesize[4],
const AVPixFmtDescriptor *desc, int x, int y, int c, int w, int read_pal_component)
{
AVComponentDescriptor comp= desc->comp[c];
int plane= comp.plane;
int depth= comp.depth_minus1+1;
int mask = (1<<depth)-1;
int shift= comp.shift;
int step = comp.step_minus1+1;
int flags= desc->flags;
if (flags & PIX_FMT_BITSTREAM){
int skip = x*step + comp.offset_plus1-1;
const uint8_t *p = data[plane] + y*linesize[plane] + (skip>>3);
int shift = 8 - depth - (skip&7);
while(w--){
int val = (*p >> shift) & mask;
if(read_pal_component)
val= data[1][4*val + c];
shift -= step;
p -= shift>>3;
shift &= 7;
*dst++= val;
}
} else {
const uint8_t *p = data[plane]+ y*linesize[plane] + x*step + comp.offset_plus1-1;
while(w--){
int val;
if(flags & PIX_FMT_BE) val= AV_RB16(p);
else val= AV_RL16(p);
val = (val>>shift) & mask;
if(read_pal_component)
val= data[1][4*val + c];
p+= step;
*dst++= val;
}
}
}
void av_write_image_line(const uint16_t *src, uint8_t *data[4], const int linesize[4],
const AVPixFmtDescriptor *desc, int x, int y, int c, int w)
{
AVComponentDescriptor comp = desc->comp[c];
int plane = comp.plane;
int depth = comp.depth_minus1+1;
int step = comp.step_minus1+1;
int flags = desc->flags;
if (flags & PIX_FMT_BITSTREAM) {
int skip = x*step + comp.offset_plus1-1;
uint8_t *p = data[plane] + y*linesize[plane] + (skip>>3);
int shift = 8 - depth - (skip&7);
while (w--) {
*p |= *src++ << shift;
shift -= step;
p -= shift>>3;
shift &= 7;
}
} else {
int shift = comp.shift;
uint8_t *p = data[plane]+ y*linesize[plane] + x*step + comp.offset_plus1-1;
while (w--) {
if (flags & PIX_FMT_BE) {
uint16_t val = AV_RB16(p) | (*src++<<shift);
AV_WB16(p, val);
} else {
uint16_t val = AV_RL16(p) | (*src++<<shift);
AV_WL16(p, val);
}
p+= step;
}
}
}
const AVPixFmtDescriptor av_pix_fmt_descriptors[PIX_FMT_NB] = {
[PIX_FMT_YUV420P] = {
.name = "yuv420p",
.nb_components= 3,
.log2_chroma_w= 1,
.log2_chroma_h= 1,
.comp = {
{0,0,1,0,7}, /* Y */
{1,0,1,0,7}, /* U */
{2,0,1,0,7}, /* V */
},
},
[PIX_FMT_YUYV422] = {
.name = "yuyv422",
.nb_components= 3,
.log2_chroma_w= 1,
.log2_chroma_h= 0,
.comp = {
{0,1,1,0,7}, /* Y */
{0,3,2,0,7}, /* U */
{0,3,4,0,7}, /* V */
},
},
[PIX_FMT_RGB24] = {
.name = "rgb24",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,2,1,0,7}, /* R */
{0,2,2,0,7}, /* G */
{0,2,3,0,7}, /* B */
},
},
[PIX_FMT_BGR24] = {
.name = "bgr24",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,2,1,0,7}, /* B */
{0,2,2,0,7}, /* G */
{0,2,3,0,7}, /* R */
},
},
[PIX_FMT_YUV422P] = {
.name = "yuv422p",
.nb_components= 3,
.log2_chroma_w= 1,
.log2_chroma_h= 0,
.comp = {
{0,0,1,0,7}, /* Y */
{1,0,1,0,7}, /* U */
{2,0,1,0,7}, /* V */
},
},
[PIX_FMT_YUV444P] = {
.name = "yuv444p",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,0,1,0,7}, /* Y */
{1,0,1,0,7}, /* U */
{2,0,1,0,7}, /* V */
},
},
[PIX_FMT_YUV410P] = {
.name = "yuv410p",
.nb_components= 3,
.log2_chroma_w= 2,
.log2_chroma_h= 2,
.comp = {
{0,0,1,0,7}, /* Y */
{1,0,1,0,7}, /* U */
{2,0,1,0,7}, /* V */
},
},
[PIX_FMT_YUV411P] = {
.name = "yuv411p",
.nb_components= 3,
.log2_chroma_w= 2,
.log2_chroma_h= 0,
.comp = {
{0,0,1,0,7}, /* Y */
{1,0,1,0,7}, /* U */
{2,0,1,0,7}, /* V */
},
},
[PIX_FMT_GRAY8] = {
.name = "gray",
.nb_components= 1,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,0,1,0,7}, /* Y */
},
.flags = PIX_FMT_PAL,
},
[PIX_FMT_MONOWHITE] = {
.name = "monow",
.nb_components= 1,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,0,1,0,0}, /* Y */
},
.flags = PIX_FMT_BITSTREAM,
},
[PIX_FMT_MONOBLACK] = {
.name = "monob",
.nb_components= 1,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,0,1,7,0}, /* Y */
},
.flags = PIX_FMT_BITSTREAM,
},
[PIX_FMT_PAL8] = {
.name = "pal8",
.nb_components= 1,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,0,1,0,7},
},
.flags = PIX_FMT_PAL,
},
[PIX_FMT_YUVJ420P] = {
.name = "yuvj420p",
.nb_components= 3,
.log2_chroma_w= 1,
.log2_chroma_h= 1,
.comp = {
{0,0,1,0,7}, /* Y */
{1,0,1,0,7}, /* U */
{2,0,1,0,7}, /* V */
},
},
[PIX_FMT_YUVJ422P] = {
.name = "yuvj422p",
.nb_components= 3,
.log2_chroma_w= 1,
.log2_chroma_h= 0,
.comp = {
{0,0,1,0,7}, /* Y */
{1,0,1,0,7}, /* U */
{2,0,1,0,7}, /* V */
},
},
[PIX_FMT_YUVJ444P] = {
.name = "yuvj444p",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,0,1,0,7}, /* Y */
{1,0,1,0,7}, /* U */
{2,0,1,0,7}, /* V */
},
},
[PIX_FMT_XVMC_MPEG2_MC] = {
.name = "xvmcmc",
.flags = PIX_FMT_HWACCEL,
},
[PIX_FMT_XVMC_MPEG2_IDCT] = {
.name = "xvmcidct",
.flags = PIX_FMT_HWACCEL,
},
[PIX_FMT_UYVY422] = {
.name = "uyvy422",
.nb_components= 3,
.log2_chroma_w= 1,
.log2_chroma_h= 0,
.comp = {
{0,1,2,0,7}, /* Y */
{0,3,1,0,7}, /* U */
{0,3,3,0,7}, /* V */
},
},
[PIX_FMT_UYYVYY411] = {
.name = "uyyvyy411",
.nb_components= 3,
.log2_chroma_w= 2,
.log2_chroma_h= 0,
.comp = {
{0,3,2,0,7}, /* Y */
{0,5,1,0,7}, /* U */
{0,5,4,0,7}, /* V */
},
},
[PIX_FMT_BGR8] = {
.name = "bgr8",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,0,1,6,1}, /* B */
{0,0,1,3,2}, /* G */
{0,0,1,0,2}, /* R */
},
.flags = PIX_FMT_PAL,
},
[PIX_FMT_BGR4] = {
.name = "bgr4",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,3,1,0,0}, /* B */
{0,3,2,0,1}, /* G */
{0,3,4,0,0}, /* R */
},
.flags = PIX_FMT_BITSTREAM,
},
[PIX_FMT_BGR4_BYTE] = {
.name = "bgr4_byte",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,0,1,3,0}, /* B */
{0,0,1,1,1}, /* G */
{0,0,1,0,0}, /* R */
},
.flags = PIX_FMT_PAL,
},
[PIX_FMT_RGB8] = {
.name = "rgb8",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,0,1,6,1}, /* R */
{0,0,1,3,2}, /* G */
{0,0,1,0,2}, /* B */
},
.flags = PIX_FMT_PAL,
},
[PIX_FMT_RGB4] = {
.name = "rgb4",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,3,1,0,0}, /* R */
{0,3,2,0,1}, /* G */
{0,3,4,0,0}, /* B */
},
.flags = PIX_FMT_BITSTREAM,
},
[PIX_FMT_RGB4_BYTE] = {
.name = "rgb4_byte",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,0,1,3,0}, /* R */
{0,0,1,1,1}, /* G */
{0,0,1,0,0}, /* B */
},
.flags = PIX_FMT_PAL,
},
[PIX_FMT_NV12] = {
.name = "nv12",
.nb_components= 3,
.log2_chroma_w= 1,
.log2_chroma_h= 1,
.comp = {
{0,0,1,0,7}, /* Y */
{1,1,1,0,7}, /* U */
{1,1,2,0,7}, /* V */
},
},
[PIX_FMT_NV21] = {
.name = "nv21",
.nb_components= 3,
.log2_chroma_w= 1,
.log2_chroma_h= 1,
.comp = {
{0,0,1,0,7}, /* Y */
{1,1,1,0,7}, /* V */
{1,1,2,0,7}, /* U */
},
},
[PIX_FMT_ARGB] = {
.name = "argb",
.nb_components= 4,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,3,1,0,7}, /* A */
{0,3,2,0,7}, /* R */
{0,3,3,0,7}, /* G */
{0,3,4,0,7}, /* B */
},
},
[PIX_FMT_RGBA] = {
.name = "rgba",
.nb_components= 4,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,3,1,0,7}, /* R */
{0,3,2,0,7}, /* G */
{0,3,3,0,7}, /* B */
{0,3,4,0,7}, /* A */
},
},
[PIX_FMT_ABGR] = {
.name = "abgr",
.nb_components= 4,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,3,1,0,7}, /* A */
{0,3,2,0,7}, /* B */
{0,3,3,0,7}, /* G */
{0,3,4,0,7}, /* R */
},
},
[PIX_FMT_BGRA] = {
.name = "bgra",
.nb_components= 4,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,3,1,0,7}, /* B */
{0,3,2,0,7}, /* G */
{0,3,3,0,7}, /* R */
{0,3,4,0,7}, /* A */
},
},
[PIX_FMT_GRAY16BE] = {
.name = "gray16be",
.nb_components= 1,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,1,1,0,15}, /* Y */
},
.flags = PIX_FMT_BE,
},
[PIX_FMT_GRAY16LE] = {
.name = "gray16le",
.nb_components= 1,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,1,1,0,15}, /* Y */
},
},
[PIX_FMT_YUV440P] = {
.name = "yuv440p",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 1,
.comp = {
{0,0,1,0,7}, /* Y */
{1,0,1,0,7}, /* U */
{2,0,1,0,7}, /* V */
},
},
[PIX_FMT_YUVJ440P] = {
.name = "yuvj440p",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 1,
.comp = {
{0,0,1,0,7}, /* Y */
{1,0,1,0,7}, /* U */
{2,0,1,0,7}, /* V */
},
},
[PIX_FMT_YUVA420P] = {
.name = "yuva420p",
.nb_components= 4,
.log2_chroma_w= 1,
.log2_chroma_h= 1,
.comp = {
{0,0,1,0,7}, /* Y */
{1,0,1,0,7}, /* U */
{2,0,1,0,7}, /* V */
{3,0,1,0,7}, /* A */
},
},
[PIX_FMT_VDPAU_H264] = {
.name = "vdpau_h264",
.log2_chroma_w = 1,
.log2_chroma_h = 1,
.flags = PIX_FMT_HWACCEL,
},
[PIX_FMT_VDPAU_MPEG1] = {
.name = "vdpau_mpeg1",
.log2_chroma_w = 1,
.log2_chroma_h = 1,
.flags = PIX_FMT_HWACCEL,
},
[PIX_FMT_VDPAU_MPEG2] = {
.name = "vdpau_mpeg2",
.log2_chroma_w = 1,
.log2_chroma_h = 1,
.flags = PIX_FMT_HWACCEL,
},
[PIX_FMT_VDPAU_WMV3] = {
.name = "vdpau_wmv3",
.log2_chroma_w = 1,
.log2_chroma_h = 1,
.flags = PIX_FMT_HWACCEL,
},
[PIX_FMT_VDPAU_VC1] = {
.name = "vdpau_vc1",
.log2_chroma_w = 1,
.log2_chroma_h = 1,
.flags = PIX_FMT_HWACCEL,
},
[PIX_FMT_VDPAU_MPEG4] = {
.name = "vdpau_mpeg4",
.log2_chroma_w = 1,
.log2_chroma_h = 1,
.flags = PIX_FMT_HWACCEL,
},
[PIX_FMT_RGB48BE] = {
.name = "rgb48be",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,5,1,0,15}, /* R */
{0,5,3,0,15}, /* G */
{0,5,5,0,15}, /* B */
},
.flags = PIX_FMT_BE,
},
[PIX_FMT_RGB48LE] = {
.name = "rgb48le",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,5,1,0,15}, /* R */
{0,5,3,0,15}, /* G */
{0,5,5,0,15}, /* B */
},
},
[PIX_FMT_RGB565BE] = {
.name = "rgb565be",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,1,0,3,4}, /* R */
{0,1,1,5,5}, /* G */
{0,1,1,0,4}, /* B */
},
.flags = PIX_FMT_BE,
},
[PIX_FMT_RGB565LE] = {
.name = "rgb565le",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,1,2,3,4}, /* R */
{0,1,1,5,5}, /* G */
{0,1,1,0,4}, /* B */
},
},
[PIX_FMT_RGB555BE] = {
.name = "rgb555be",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,1,0,2,4}, /* R */
{0,1,1,5,4}, /* G */
{0,1,1,0,4}, /* B */
},
.flags = PIX_FMT_BE,
},
[PIX_FMT_RGB555LE] = {
.name = "rgb555le",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,1,2,2,4}, /* R */
{0,1,1,5,4}, /* G */
{0,1,1,0,4}, /* B */
},
},
[PIX_FMT_RGB444BE] = {
.name = "rgb444be",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,1,0,0,3}, /* R */
{0,1,1,4,3}, /* G */
{0,1,1,0,3}, /* B */
},
.flags = PIX_FMT_BE,
},
[PIX_FMT_RGB444LE] = {
.name = "rgb444le",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,1,2,0,3}, /* R */
{0,1,1,4,3}, /* G */
{0,1,1,0,3}, /* B */
},
},
[PIX_FMT_BGR565BE] = {
.name = "bgr565be",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,1,0,3,4}, /* B */
{0,1,1,5,5}, /* G */
{0,1,1,0,4}, /* R */
},
.flags = PIX_FMT_BE,
},
[PIX_FMT_BGR565LE] = {
.name = "bgr565le",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,1,2,3,4}, /* B */
{0,1,1,5,5}, /* G */
{0,1,1,0,4}, /* R */
},
},
[PIX_FMT_BGR555BE] = {
.name = "bgr555be",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,1,0,2,4}, /* B */
{0,1,1,5,4}, /* G */
{0,1,1,0,4}, /* R */
},
.flags = PIX_FMT_BE,
},
[PIX_FMT_BGR555LE] = {
.name = "bgr555le",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,1,2,2,4}, /* B */
{0,1,1,5,4}, /* G */
{0,1,1,0,4}, /* R */
},
},
[PIX_FMT_BGR444BE] = {
.name = "bgr444be",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,1,0,0,3}, /* B */
{0,1,1,4,3}, /* G */
{0,1,1,0,3}, /* R */
},
.flags = PIX_FMT_BE,
},
[PIX_FMT_BGR444LE] = {
.name = "bgr444le",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,1,2,0,3}, /* B */
{0,1,1,4,3}, /* G */
{0,1,1,0,3}, /* R */
},
},
[PIX_FMT_VAAPI_MOCO] = {
.name = "vaapi_moco",
.log2_chroma_w = 1,
.log2_chroma_h = 1,
.flags = PIX_FMT_HWACCEL,
},
[PIX_FMT_VAAPI_IDCT] = {
.name = "vaapi_idct",
.log2_chroma_w = 1,
.log2_chroma_h = 1,
.flags = PIX_FMT_HWACCEL,
},
[PIX_FMT_VAAPI_VLD] = {
.name = "vaapi_vld",
.log2_chroma_w = 1,
.log2_chroma_h = 1,
.flags = PIX_FMT_HWACCEL,
},
[PIX_FMT_YUV420P16LE] = {
.name = "yuv420p16le",
.nb_components= 3,
.log2_chroma_w= 1,
.log2_chroma_h= 1,
.comp = {
{0,1,1,0,15}, /* Y */
{1,1,1,0,15}, /* U */
{2,1,1,0,15}, /* V */
},
},
[PIX_FMT_YUV420P16BE] = {
.name = "yuv420p16be",
.nb_components= 3,
.log2_chroma_w= 1,
.log2_chroma_h= 1,
.comp = {
{0,1,1,0,15}, /* Y */
{1,1,1,0,15}, /* U */
{2,1,1,0,15}, /* V */
},
.flags = PIX_FMT_BE,
},
[PIX_FMT_YUV422P16LE] = {
.name = "yuv422p16le",
.nb_components= 3,
.log2_chroma_w= 1,
.log2_chroma_h= 0,
.comp = {
{0,1,1,0,15}, /* Y */
{1,1,1,0,15}, /* U */
{2,1,1,0,15}, /* V */
},
},
[PIX_FMT_YUV422P16BE] = {
.name = "yuv422p16be",
.nb_components= 3,
.log2_chroma_w= 1,
.log2_chroma_h= 0,
.comp = {
{0,1,1,0,15}, /* Y */
{1,1,1,0,15}, /* U */
{2,1,1,0,15}, /* V */
},
.flags = PIX_FMT_BE,
},
[PIX_FMT_YUV444P16LE] = {
.name = "yuv444p16le",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,1,1,0,15}, /* Y */
{1,1,1,0,15}, /* U */
{2,1,1,0,15}, /* V */
},
},
[PIX_FMT_YUV444P16BE] = {
.name = "yuv444p16be",
.nb_components= 3,
.log2_chroma_w= 0,
.log2_chroma_h= 0,
.comp = {
{0,1,1,0,15}, /* Y */
{1,1,1,0,15}, /* U */
{2,1,1,0,15}, /* V */
},
.flags = PIX_FMT_BE,
},
[PIX_FMT_DXVA2_VLD] = {
.name = "dxva2_vld",
.log2_chroma_w = 1,
.log2_chroma_h = 1,
.flags = PIX_FMT_HWACCEL,
},
[PIX_FMT_Y400A] = {
.name = "y400a",
.nb_components= 2,
.comp = {
{0,1,1,0,7}, /* Y */
{0,1,2,0,7}, /* A */
},
},
};
static enum PixelFormat get_pix_fmt_internal(const char *name)
{
enum PixelFormat pix_fmt;
for (pix_fmt = 0; pix_fmt < PIX_FMT_NB; pix_fmt++)
if (av_pix_fmt_descriptors[pix_fmt].name &&
!strcmp(av_pix_fmt_descriptors[pix_fmt].name, name))
return pix_fmt;
return PIX_FMT_NONE;
}
#if HAVE_BIGENDIAN
# define X_NE(be, le) be
#else
# define X_NE(be, le) le
#endif
enum PixelFormat av_get_pix_fmt(const char *name)
{
enum PixelFormat pix_fmt;
if (!strcmp(name, "rgb32"))
name = X_NE("argb", "bgra");
else if (!strcmp(name, "bgr32"))
name = X_NE("abgr", "rgba");
pix_fmt = get_pix_fmt_internal(name);
if (pix_fmt == PIX_FMT_NONE) {
char name2[32];
snprintf(name2, sizeof(name2), "%s%s", name, X_NE("be", "le"));
pix_fmt = get_pix_fmt_internal(name2);
}
return pix_fmt;
}
int av_get_bits_per_pixel(const AVPixFmtDescriptor *pixdesc)
{
int c, bits = 0;
int log2_pixels = pixdesc->log2_chroma_w + pixdesc->log2_chroma_h;
for (c = 0; c < pixdesc->nb_components; c++) {
int s = c==1 || c==2 ? 0 : log2_pixels;
bits += (pixdesc->comp[c].depth_minus1+1) << s;
}
return bits >> log2_pixels;
}