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ffmpeg/libswscale/yuv2rgb.c
Vittorio Giovara ff8c2c4103 yuv2rgb: Document the color space coefficients 
Based on the original documentation found in mpeg2dec (1995).

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
2016-01-19 23:30:36 +01:00

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/*
* software YUV to RGB converter
*
* Copyright (C) 2009 Konstantin Shishkov
*
* 1,4,8bpp support and context / deglobalize stuff
* by 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 <stdlib.h>
#include <inttypes.h>
#include "libavutil/cpu.h"
#include "libavutil/bswap.h"
#include "config.h"
#include "rgb2rgb.h"
#include "swscale.h"
#include "swscale_internal.h"
#include "libavutil/pixdesc.h"
/* Color space conversion coefficients for YCbCr -> RGB mapping.
*
* Entries are {crv, cbu, cgu, cgv}
*
* crv = (255 / 224) * 65536 * (1 - cr) / 0.5
* cbu = (255 / 224) * 65536 * (1 - cb) / 0.5
* cgu = (255 / 224) * 65536 * (cb / cg) * (1 - cb) / 0.5
* cgv = (255 / 224) * 65536 * (cr / cg) * (1 - cr) / 0.5
*
* where Y = cr * R + cg * G + cb * B and cr + cg + cb = 1.
*/
const int32_t ff_yuv2rgb_coeffs[8][4] = {
{ 117504, 138453, 13954, 34903 }, /* no sequence_display_extension */
{ 117504, 138453, 13954, 34903 }, /* ITU-R Rec. 709 (1990) */
{ 104597, 132201, 25675, 53279 }, /* unspecified */
{ 104597, 132201, 25675, 53279 }, /* reserved */
{ 104448, 132798, 24759, 53109 }, /* FCC */
{ 104597, 132201, 25675, 53279 }, /* ITU-R Rec. 624-4 System B, G */
{ 104597, 132201, 25675, 53279 }, /* SMPTE 170M */
{ 117579, 136230, 16907, 35559 } /* SMPTE 240M (1987) */
};
const int *sws_getCoefficients(int colorspace)
{
if (colorspace > 7 || colorspace < 0)
colorspace = SWS_CS_DEFAULT;
return ff_yuv2rgb_coeffs[colorspace];
}
#define LOADCHROMA(i) \
U = pu[i]; \
V = pv[i]; \
r = (void *)c->table_rV[V+YUVRGB_TABLE_HEADROOM]; \
g = (void *)(c->table_gU[U+YUVRGB_TABLE_HEADROOM] + c->table_gV[V+YUVRGB_TABLE_HEADROOM]); \
b = (void *)c->table_bU[U+YUVRGB_TABLE_HEADROOM];
#define PUTRGB(dst, src, i) \
Y = src[2 * i]; \
dst[2 * i] = r[Y] + g[Y] + b[Y]; \
Y = src[2 * i + 1]; \
dst[2 * i + 1] = r[Y] + g[Y] + b[Y];
#define PUTRGB24(dst, src, i) \
Y = src[2 * i]; \
dst[6 * i + 0] = r[Y]; \
dst[6 * i + 1] = g[Y]; \
dst[6 * i + 2] = b[Y]; \
Y = src[2 * i + 1]; \
dst[6 * i + 3] = r[Y]; \
dst[6 * i + 4] = g[Y]; \
dst[6 * i + 5] = b[Y];
#define PUTBGR24(dst, src, i) \
Y = src[2 * i]; \
dst[6 * i + 0] = b[Y]; \
dst[6 * i + 1] = g[Y]; \
dst[6 * i + 2] = r[Y]; \
Y = src[2 * i + 1]; \
dst[6 * i + 3] = b[Y]; \
dst[6 * i + 4] = g[Y]; \
dst[6 * i + 5] = r[Y];
#define PUTRGBA(dst, ysrc, asrc, i, s) \
Y = ysrc[2 * i]; \
dst[2 * i] = r[Y] + g[Y] + b[Y] + (asrc[2 * i] << s); \
Y = ysrc[2 * i + 1]; \
dst[2 * i + 1] = r[Y] + g[Y] + b[Y] + (asrc[2 * i + 1] << s);
#define PUTRGB48(dst, src, i) \
Y = src[ 2 * i]; \
dst[12 * i + 0] = dst[12 * i + 1] = r[Y]; \
dst[12 * i + 2] = dst[12 * i + 3] = g[Y]; \
dst[12 * i + 4] = dst[12 * i + 5] = b[Y]; \
Y = src[ 2 * i + 1]; \
dst[12 * i + 6] = dst[12 * i + 7] = r[Y]; \
dst[12 * i + 8] = dst[12 * i + 9] = g[Y]; \
dst[12 * i + 10] = dst[12 * i + 11] = b[Y];
#define PUTBGR48(dst, src, i) \
Y = src[2 * i]; \
dst[12 * i + 0] = dst[12 * i + 1] = b[Y]; \
dst[12 * i + 2] = dst[12 * i + 3] = g[Y]; \
dst[12 * i + 4] = dst[12 * i + 5] = r[Y]; \
Y = src[2 * i + 1]; \
dst[12 * i + 6] = dst[12 * i + 7] = b[Y]; \
dst[12 * i + 8] = dst[12 * i + 9] = g[Y]; \
dst[12 * i + 10] = dst[12 * i + 11] = r[Y];
#define YUV2RGBFUNC(func_name, dst_type, alpha) \
static int func_name(SwsContext *c, const uint8_t *src[], \
int srcStride[], int srcSliceY, int srcSliceH, \
uint8_t *dst[], int dstStride[]) \
{ \
int y; \
\
if (!alpha && c->srcFormat == AV_PIX_FMT_YUV422P) { \
srcStride[1] *= 2; \
srcStride[2] *= 2; \
} \
for (y = 0; y < srcSliceH; y += 2) { \
dst_type *dst_1 = \
(dst_type *)(dst[0] + (y + srcSliceY) * dstStride[0]); \
dst_type *dst_2 = \
(dst_type *)(dst[0] + (y + srcSliceY + 1) * dstStride[0]); \
dst_type av_unused *r, *g, *b; \
const uint8_t *py_1 = src[0] + y * srcStride[0]; \
const uint8_t *py_2 = py_1 + srcStride[0]; \
const uint8_t *pu = src[1] + (y >> 1) * srcStride[1]; \
const uint8_t *pv = src[2] + (y >> 1) * srcStride[2]; \
const uint8_t av_unused *pa_1, *pa_2; \
unsigned int h_size = c->dstW >> 3; \
if (alpha) { \
pa_1 = src[3] + y * srcStride[3]; \
pa_2 = pa_1 + srcStride[3]; \
} \
while (h_size--) { \
int av_unused U, V, Y; \
#define ENDYUV2RGBLINE(dst_delta, ss) \
pu += 4 >> ss; \
pv += 4 >> ss; \
py_1 += 8 >> ss; \
py_2 += 8 >> ss; \
dst_1 += dst_delta >> ss; \
dst_2 += dst_delta >> ss; \
} \
if (c->dstW & (4 >> ss)) { \
int av_unused Y, U, V; \
#define ENDYUV2RGBFUNC() \
} \
} \
return srcSliceH; \
}
#define CLOSEYUV2RGBFUNC(dst_delta) \
ENDYUV2RGBLINE(dst_delta, 0) \
ENDYUV2RGBFUNC()
YUV2RGBFUNC(yuv2rgb_c_48, uint8_t, 0)
LOADCHROMA(0);
PUTRGB48(dst_1, py_1, 0);
PUTRGB48(dst_2, py_2, 0);
LOADCHROMA(1);
PUTRGB48(dst_2, py_2, 1);
PUTRGB48(dst_1, py_1, 1);
LOADCHROMA(2);
PUTRGB48(dst_1, py_1, 2);
PUTRGB48(dst_2, py_2, 2);
LOADCHROMA(3);
PUTRGB48(dst_2, py_2, 3);
PUTRGB48(dst_1, py_1, 3);
ENDYUV2RGBLINE(48, 0)
LOADCHROMA(0);
PUTRGB48(dst_1, py_1, 0);
PUTRGB48(dst_2, py_2, 0);
LOADCHROMA(1);
PUTRGB48(dst_2, py_2, 1);
PUTRGB48(dst_1, py_1, 1);
ENDYUV2RGBLINE(48, 1)
LOADCHROMA(0);
PUTRGB48(dst_1, py_1, 0);
PUTRGB48(dst_2, py_2, 0);
ENDYUV2RGBFUNC()
YUV2RGBFUNC(yuv2rgb_c_bgr48, uint8_t, 0)
LOADCHROMA(0);
PUTBGR48(dst_1, py_1, 0);
PUTBGR48(dst_2, py_2, 0);
LOADCHROMA(1);
PUTBGR48(dst_2, py_2, 1);
PUTBGR48(dst_1, py_1, 1);
LOADCHROMA(2);
PUTBGR48(dst_1, py_1, 2);
PUTBGR48(dst_2, py_2, 2);
LOADCHROMA(3);
PUTBGR48(dst_2, py_2, 3);
PUTBGR48(dst_1, py_1, 3);
ENDYUV2RGBLINE(48, 0)
LOADCHROMA(0);
PUTBGR48(dst_1, py_1, 0);
PUTBGR48(dst_2, py_2, 0);
LOADCHROMA(1);
PUTBGR48(dst_2, py_2, 1);
PUTBGR48(dst_1, py_1, 1);
ENDYUV2RGBLINE(48, 1)
LOADCHROMA(0);
PUTBGR48(dst_1, py_1, 0);
PUTBGR48(dst_2, py_2, 0);
ENDYUV2RGBFUNC()
YUV2RGBFUNC(yuv2rgb_c_32, uint32_t, 0)
LOADCHROMA(0);
PUTRGB(dst_1, py_1, 0);
PUTRGB(dst_2, py_2, 0);
LOADCHROMA(1);
PUTRGB(dst_2, py_2, 1);
PUTRGB(dst_1, py_1, 1);
LOADCHROMA(2);
PUTRGB(dst_1, py_1, 2);
PUTRGB(dst_2, py_2, 2);
LOADCHROMA(3);
PUTRGB(dst_2, py_2, 3);
PUTRGB(dst_1, py_1, 3);
ENDYUV2RGBLINE(8, 0)
LOADCHROMA(0);
PUTRGB(dst_1, py_1, 0);
PUTRGB(dst_2, py_2, 0);
LOADCHROMA(1);
PUTRGB(dst_2, py_2, 1);
PUTRGB(dst_1, py_1, 1);
ENDYUV2RGBLINE(8, 1)
LOADCHROMA(0);
PUTRGB(dst_1, py_1, 0);
PUTRGB(dst_2, py_2, 0);
ENDYUV2RGBFUNC()
YUV2RGBFUNC(yuva2rgba_c, uint32_t, 1)
LOADCHROMA(0);
PUTRGBA(dst_1, py_1, pa_1, 0, 24);
PUTRGBA(dst_2, py_2, pa_2, 0, 24);
LOADCHROMA(1);
PUTRGBA(dst_2, py_2, pa_2, 1, 24);
PUTRGBA(dst_1, py_1, pa_1, 1, 24);
LOADCHROMA(2);
PUTRGBA(dst_1, py_1, pa_1, 2, 24);
PUTRGBA(dst_2, py_2, pa_2, 2, 24);
LOADCHROMA(3);
PUTRGBA(dst_2, py_2, pa_2, 3, 24);
PUTRGBA(dst_1, py_1, pa_1, 3, 24);
pa_1 += 8;
pa_2 += 8;
ENDYUV2RGBLINE(8, 0)
LOADCHROMA(0);
PUTRGBA(dst_1, py_1, pa_1, 0, 24);
PUTRGBA(dst_2, py_2, pa_2, 0, 24);
LOADCHROMA(1);
PUTRGBA(dst_2, py_2, pa_2, 1, 24);
PUTRGBA(dst_1, py_1, pa_1, 1, 24);
pa_1 += 4;
pa_2 += 4;
ENDYUV2RGBLINE(8, 1)
LOADCHROMA(0);
PUTRGBA(dst_1, py_1, pa_1, 0, 24);
PUTRGBA(dst_2, py_2, pa_2, 0, 24);
ENDYUV2RGBFUNC()
YUV2RGBFUNC(yuva2argb_c, uint32_t, 1)
LOADCHROMA(0);
PUTRGBA(dst_1, py_1, pa_1, 0, 0);
PUTRGBA(dst_2, py_2, pa_2, 0, 0);
LOADCHROMA(1);
PUTRGBA(dst_2, py_2, pa_2, 1, 0);
PUTRGBA(dst_1, py_1, pa_1, 1, 0);
LOADCHROMA(2);
PUTRGBA(dst_1, py_1, pa_1, 2, 0);
PUTRGBA(dst_2, py_2, pa_2, 2, 0);
LOADCHROMA(3);
PUTRGBA(dst_2, py_2, pa_2, 3, 0);
PUTRGBA(dst_1, py_1, pa_1, 3, 0);
pa_1 += 8;
pa_2 += 8;
ENDYUV2RGBLINE(8, 0)
LOADCHROMA(0);
PUTRGBA(dst_1, py_1, pa_1, 0, 0);
PUTRGBA(dst_2, py_2, pa_2, 0, 0);
LOADCHROMA(1);
PUTRGBA(dst_2, py_2, pa_2, 1, 0);
PUTRGBA(dst_1, py_1, pa_1, 1, 0);
pa_1 += 4;
pa_2 += 4;
ENDYUV2RGBLINE(8, 1)
LOADCHROMA(0);
PUTRGBA(dst_1, py_1, pa_1, 0, 0);
PUTRGBA(dst_2, py_2, pa_2, 0, 0);
ENDYUV2RGBFUNC()
YUV2RGBFUNC(yuv2rgb_c_24_rgb, uint8_t, 0)
LOADCHROMA(0);
PUTRGB24(dst_1, py_1, 0);
PUTRGB24(dst_2, py_2, 0);
LOADCHROMA(1);
PUTRGB24(dst_2, py_2, 1);
PUTRGB24(dst_1, py_1, 1);
LOADCHROMA(2);
PUTRGB24(dst_1, py_1, 2);
PUTRGB24(dst_2, py_2, 2);
LOADCHROMA(3);
PUTRGB24(dst_2, py_2, 3);
PUTRGB24(dst_1, py_1, 3);
ENDYUV2RGBLINE(24, 0)
LOADCHROMA(0);
PUTRGB24(dst_1, py_1, 0);
PUTRGB24(dst_2, py_2, 0);
LOADCHROMA(1);
PUTRGB24(dst_2, py_2, 1);
PUTRGB24(dst_1, py_1, 1);
ENDYUV2RGBLINE(24, 1)
LOADCHROMA(0);
PUTRGB24(dst_1, py_1, 0);
PUTRGB24(dst_2, py_2, 0);
ENDYUV2RGBFUNC()
// only trivial mods from yuv2rgb_c_24_rgb
YUV2RGBFUNC(yuv2rgb_c_24_bgr, uint8_t, 0)
LOADCHROMA(0);
PUTBGR24(dst_1, py_1, 0);
PUTBGR24(dst_2, py_2, 0);
LOADCHROMA(1);
PUTBGR24(dst_2, py_2, 1);
PUTBGR24(dst_1, py_1, 1);
LOADCHROMA(2);
PUTBGR24(dst_1, py_1, 2);
PUTBGR24(dst_2, py_2, 2);
LOADCHROMA(3);
PUTBGR24(dst_2, py_2, 3);
PUTBGR24(dst_1, py_1, 3);
ENDYUV2RGBLINE(24, 0)
LOADCHROMA(0);
PUTBGR24(dst_1, py_1, 0);
PUTBGR24(dst_2, py_2, 0);
LOADCHROMA(1);
PUTBGR24(dst_2, py_2, 1);
PUTBGR24(dst_1, py_1, 1);
ENDYUV2RGBLINE(24, 1)
LOADCHROMA(0);
PUTBGR24(dst_1, py_1, 0);
PUTBGR24(dst_2, py_2, 0);
ENDYUV2RGBFUNC()
YUV2RGBFUNC(yuv2rgb_c_16_ordered_dither, uint16_t, 0)
const uint8_t *d16 = ff_dither_2x2_8[y & 1];
const uint8_t *e16 = ff_dither_2x2_4[y & 1];
const uint8_t *f16 = ff_dither_2x2_8[(y & 1)^1];
#define PUTRGB16(dst, src, i, o) \
Y = src[2 * i]; \
dst[2 * i] = r[Y + d16[0 + o]] + \
g[Y + e16[0 + o]] + \
b[Y + f16[0 + o]]; \
Y = src[2 * i + 1]; \
dst[2 * i + 1] = r[Y + d16[1 + o]] + \
g[Y + e16[1 + o]] + \
b[Y + f16[1 + o]];
LOADCHROMA(0);
PUTRGB16(dst_1, py_1, 0, 0);
PUTRGB16(dst_2, py_2, 0, 0 + 8);
LOADCHROMA(1);
PUTRGB16(dst_2, py_2, 1, 2 + 8);
PUTRGB16(dst_1, py_1, 1, 2);
LOADCHROMA(2);
PUTRGB16(dst_1, py_1, 2, 4);
PUTRGB16(dst_2, py_2, 2, 4 + 8);
LOADCHROMA(3);
PUTRGB16(dst_2, py_2, 3, 6 + 8);
PUTRGB16(dst_1, py_1, 3, 6);
CLOSEYUV2RGBFUNC(8)
YUV2RGBFUNC(yuv2rgb_c_15_ordered_dither, uint16_t, 0)
const uint8_t *d16 = ff_dither_2x2_8[y & 1];
const uint8_t *e16 = ff_dither_2x2_8[(y & 1)^1];
#define PUTRGB15(dst, src, i, o) \
Y = src[2 * i]; \
dst[2 * i] = r[Y + d16[0 + o]] + \
g[Y + d16[1 + o]] + \
b[Y + e16[0 + o]]; \
Y = src[2 * i + 1]; \
dst[2 * i + 1] = r[Y + d16[1 + o]] + \
g[Y + d16[0 + o]] + \
b[Y + e16[1 + o]];
LOADCHROMA(0);
PUTRGB15(dst_1, py_1, 0, 0);
PUTRGB15(dst_2, py_2, 0, 0 + 8);
LOADCHROMA(1);
PUTRGB15(dst_2, py_2, 1, 2 + 8);
PUTRGB15(dst_1, py_1, 1, 2);
LOADCHROMA(2);
PUTRGB15(dst_1, py_1, 2, 4);
PUTRGB15(dst_2, py_2, 2, 4 + 8);
LOADCHROMA(3);
PUTRGB15(dst_2, py_2, 3, 6 + 8);
PUTRGB15(dst_1, py_1, 3, 6);
CLOSEYUV2RGBFUNC(8)
// r, g, b, dst_1, dst_2
YUV2RGBFUNC(yuv2rgb_c_12_ordered_dither, uint16_t, 0)
const uint8_t *d16 = ff_dither_4x4_16[y & 3];
#define PUTRGB12(dst, src, i, o) \
Y = src[2 * i]; \
dst[2 * i] = r[Y + d16[0 + o]] + \
g[Y + d16[0 + o]] + \
b[Y + d16[0 + o]]; \
Y = src[2 * i + 1]; \
dst[2 * i + 1] = r[Y + d16[1 + o]] + \
g[Y + d16[1 + o]] + \
b[Y + d16[1 + o]];
LOADCHROMA(0);
PUTRGB12(dst_1, py_1, 0, 0);
PUTRGB12(dst_2, py_2, 0, 0 + 8);
LOADCHROMA(1);
PUTRGB12(dst_2, py_2, 1, 2 + 8);
PUTRGB12(dst_1, py_1, 1, 2);
LOADCHROMA(2);
PUTRGB12(dst_1, py_1, 2, 4);
PUTRGB12(dst_2, py_2, 2, 4 + 8);
LOADCHROMA(3);
PUTRGB12(dst_2, py_2, 3, 6 + 8);
PUTRGB12(dst_1, py_1, 3, 6);
CLOSEYUV2RGBFUNC(8)
// r, g, b, dst_1, dst_2
YUV2RGBFUNC(yuv2rgb_c_8_ordered_dither, uint8_t, 0)
const uint8_t *d32 = ff_dither_8x8_32[y & 7];
const uint8_t *d64 = ff_dither_8x8_73[y & 7];
#define PUTRGB8(dst, src, i, o) \
Y = src[2 * i]; \
dst[2 * i] = r[Y + d32[0 + o]] + \
g[Y + d32[0 + o]] + \
b[Y + d64[0 + o]]; \
Y = src[2 * i + 1]; \
dst[2 * i + 1] = r[Y + d32[1 + o]] + \
g[Y + d32[1 + o]] + \
b[Y + d64[1 + o]];
LOADCHROMA(0);
PUTRGB8(dst_1, py_1, 0, 0);
PUTRGB8(dst_2, py_2, 0, 0 + 8);
LOADCHROMA(1);
PUTRGB8(dst_2, py_2, 1, 2 + 8);
PUTRGB8(dst_1, py_1, 1, 2);
LOADCHROMA(2);
PUTRGB8(dst_1, py_1, 2, 4);
PUTRGB8(dst_2, py_2, 2, 4 + 8);
LOADCHROMA(3);
PUTRGB8(dst_2, py_2, 3, 6 + 8);
PUTRGB8(dst_1, py_1, 3, 6);
ENDYUV2RGBLINE(8, 0)
const uint8_t *d32 = ff_dither_8x8_32[y & 7];
const uint8_t *d64 = ff_dither_8x8_73[y & 7];
LOADCHROMA(0);
PUTRGB8(dst_1, py_1, 0, 0);
PUTRGB8(dst_2, py_2, 0, 0 + 8);
LOADCHROMA(1);
PUTRGB8(dst_2, py_2, 1, 2 + 8);
PUTRGB8(dst_1, py_1, 1, 2);
ENDYUV2RGBLINE(8, 1)
const uint8_t *d32 = ff_dither_8x8_32[y & 7];
const uint8_t *d64 = ff_dither_8x8_73[y & 7];
LOADCHROMA(0);
PUTRGB8(dst_1, py_1, 0, 0);
PUTRGB8(dst_2, py_2, 0, 0 + 8);
ENDYUV2RGBFUNC()
YUV2RGBFUNC(yuv2rgb_c_4_ordered_dither, uint8_t, 0)
const uint8_t * d64 = ff_dither_8x8_73[y & 7];
const uint8_t *d128 = ff_dither_8x8_220[y & 7];
int acc;
#define PUTRGB4D(dst, src, i, o) \
Y = src[2 * i]; \
acc = r[Y + d128[0 + o]] + \
g[Y + d64[0 + o]] + \
b[Y + d128[0 + o]]; \
Y = src[2 * i + 1]; \
acc |= (r[Y + d128[1 + o]] + \
g[Y + d64[1 + o]] + \
b[Y + d128[1 + o]]) << 4; \
dst[i] = acc;
LOADCHROMA(0);
PUTRGB4D(dst_1, py_1, 0, 0);
PUTRGB4D(dst_2, py_2, 0, 0 + 8);
LOADCHROMA(1);
PUTRGB4D(dst_2, py_2, 1, 2 + 8);
PUTRGB4D(dst_1, py_1, 1, 2);
LOADCHROMA(2);
PUTRGB4D(dst_1, py_1, 2, 4);
PUTRGB4D(dst_2, py_2, 2, 4 + 8);
LOADCHROMA(3);
PUTRGB4D(dst_2, py_2, 3, 6 + 8);
PUTRGB4D(dst_1, py_1, 3, 6);
ENDYUV2RGBLINE(4, 0)
const uint8_t * d64 = ff_dither_8x8_73[y & 7];
const uint8_t *d128 = ff_dither_8x8_220[y & 7];
int acc;
LOADCHROMA(0);
PUTRGB4D(dst_1, py_1, 0, 0);
PUTRGB4D(dst_2, py_2, 0, 0 + 8);
LOADCHROMA(1);
PUTRGB4D(dst_2, py_2, 1, 2 + 8);
PUTRGB4D(dst_1, py_1, 1, 2);
ENDYUV2RGBLINE(4, 1)
const uint8_t * d64 = ff_dither_8x8_73[y & 7];
const uint8_t *d128 = ff_dither_8x8_220[y & 7];
int acc;
LOADCHROMA(0);
PUTRGB4D(dst_1, py_1, 0, 0);
PUTRGB4D(dst_2, py_2, 0, 0 + 8);
ENDYUV2RGBFUNC()
YUV2RGBFUNC(yuv2rgb_c_4b_ordered_dither, uint8_t, 0)
const uint8_t *d64 = ff_dither_8x8_73[y & 7];
const uint8_t *d128 = ff_dither_8x8_220[y & 7];
#define PUTRGB4DB(dst, src, i, o) \
Y = src[2 * i]; \
dst[2 * i] = r[Y + d128[0 + o]] + \
g[Y + d64[0 + o]] + \
b[Y + d128[0 + o]]; \
Y = src[2 * i + 1]; \
dst[2 * i + 1] = r[Y + d128[1 + o]] + \
g[Y + d64[1 + o]] + \
b[Y + d128[1 + o]];
LOADCHROMA(0);
PUTRGB4DB(dst_1, py_1, 0, 0);
PUTRGB4DB(dst_2, py_2, 0, 0 + 8);
LOADCHROMA(1);
PUTRGB4DB(dst_2, py_2, 1, 2 + 8);
PUTRGB4DB(dst_1, py_1, 1, 2);
LOADCHROMA(2);
PUTRGB4DB(dst_1, py_1, 2, 4);
PUTRGB4DB(dst_2, py_2, 2, 4 + 8);
LOADCHROMA(3);
PUTRGB4DB(dst_2, py_2, 3, 6 + 8);
PUTRGB4DB(dst_1, py_1, 3, 6);
ENDYUV2RGBLINE(8, 0)
const uint8_t *d64 = ff_dither_8x8_73[y & 7];
const uint8_t *d128 = ff_dither_8x8_220[y & 7];
LOADCHROMA(0);
PUTRGB4DB(dst_1, py_1, 0, 0);
PUTRGB4DB(dst_2, py_2, 0, 0 + 8);
LOADCHROMA(1);
PUTRGB4DB(dst_2, py_2, 1, 2 + 8);
PUTRGB4DB(dst_1, py_1, 1, 2);
ENDYUV2RGBLINE(8, 1)
const uint8_t *d64 = ff_dither_8x8_73[y & 7];
const uint8_t *d128 = ff_dither_8x8_220[y & 7];
LOADCHROMA(0);
PUTRGB4DB(dst_1, py_1, 0, 0);
PUTRGB4DB(dst_2, py_2, 0, 0 + 8);
ENDYUV2RGBFUNC()
YUV2RGBFUNC(yuv2rgb_c_1_ordered_dither, uint8_t, 0)
const uint8_t *d128 = ff_dither_8x8_220[y & 7];
char out_1 = 0, out_2 = 0;
g = c->table_gU[128 + YUVRGB_TABLE_HEADROOM] + c->table_gV[128 + YUVRGB_TABLE_HEADROOM];
#define PUTRGB1(out, src, i, o) \
Y = src[2 * i]; \
out += out + g[Y + d128[0 + o]]; \
Y = src[2 * i + 1]; \
out += out + g[Y + d128[1 + o]];
PUTRGB1(out_1, py_1, 0, 0);
PUTRGB1(out_2, py_2, 0, 0 + 8);
PUTRGB1(out_2, py_2, 1, 2 + 8);
PUTRGB1(out_1, py_1, 1, 2);
PUTRGB1(out_1, py_1, 2, 4);
PUTRGB1(out_2, py_2, 2, 4 + 8);
PUTRGB1(out_2, py_2, 3, 6 + 8);
PUTRGB1(out_1, py_1, 3, 6);
dst_1[0] = out_1;
dst_2[0] = out_2;
CLOSEYUV2RGBFUNC(1)
SwsFunc ff_yuv2rgb_get_func_ptr(SwsContext *c)
{
SwsFunc t = NULL;
if (ARCH_PPC)
t = ff_yuv2rgb_init_ppc(c);
if (ARCH_X86)
t = ff_yuv2rgb_init_x86(c);
if (t)
return t;
av_log(c, AV_LOG_WARNING,
"No accelerated colorspace conversion found from %s to %s.\n",
av_get_pix_fmt_name(c->srcFormat), av_get_pix_fmt_name(c->dstFormat));
switch (c->dstFormat) {
case AV_PIX_FMT_BGR48BE:
case AV_PIX_FMT_BGR48LE:
return yuv2rgb_c_bgr48;
case AV_PIX_FMT_RGB48BE:
case AV_PIX_FMT_RGB48LE:
return yuv2rgb_c_48;
case AV_PIX_FMT_ARGB:
case AV_PIX_FMT_ABGR:
if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat))
return yuva2argb_c;
case AV_PIX_FMT_RGBA:
case AV_PIX_FMT_BGRA:
return (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat)) ? yuva2rgba_c : yuv2rgb_c_32;
case AV_PIX_FMT_RGB24:
return yuv2rgb_c_24_rgb;
case AV_PIX_FMT_BGR24:
return yuv2rgb_c_24_bgr;
case AV_PIX_FMT_RGB565:
case AV_PIX_FMT_BGR565:
return yuv2rgb_c_16_ordered_dither;
case AV_PIX_FMT_RGB555:
case AV_PIX_FMT_BGR555:
return yuv2rgb_c_15_ordered_dither;
case AV_PIX_FMT_RGB444:
case AV_PIX_FMT_BGR444:
return yuv2rgb_c_12_ordered_dither;
case AV_PIX_FMT_RGB8:
case AV_PIX_FMT_BGR8:
return yuv2rgb_c_8_ordered_dither;
case AV_PIX_FMT_RGB4:
case AV_PIX_FMT_BGR4:
return yuv2rgb_c_4_ordered_dither;
case AV_PIX_FMT_RGB4_BYTE:
case AV_PIX_FMT_BGR4_BYTE:
return yuv2rgb_c_4b_ordered_dither;
case AV_PIX_FMT_MONOBLACK:
return yuv2rgb_c_1_ordered_dither;
}
return NULL;
}
static void fill_table(uint8_t* table[256 + 2*YUVRGB_TABLE_HEADROOM], const int elemsize,
const int64_t inc, void *y_tab)
{
int i;
uint8_t *y_table = y_tab;
y_table -= elemsize * (inc >> 9);
for (i = 0; i < 256 + 2*YUVRGB_TABLE_HEADROOM; i++) {
int64_t cb = av_clip_uint8(i-YUVRGB_TABLE_HEADROOM)*inc;
table[i] = y_table + elemsize * (cb >> 16);
}
}
static void fill_gv_table(int table[256 + 2*YUVRGB_TABLE_HEADROOM], const int elemsize, const int64_t inc)
{
int i;
int off = -(inc >> 9);
for (i = 0; i < 256 + 2*YUVRGB_TABLE_HEADROOM; i++) {
int64_t cb = av_clip_uint8(i-YUVRGB_TABLE_HEADROOM)*inc;
table[i] = elemsize * (off + (cb >> 16));
}
}
static uint16_t roundToInt16(int64_t f)
{
int r = (f + (1 << 15)) >> 16;
if (r < -0x7FFF)
return 0x8000;
else if (r > 0x7FFF)
return 0x7FFF;
else
return r;
}
av_cold int ff_yuv2rgb_c_init_tables(SwsContext *c, const int inv_table[4],
int fullRange, int brightness,
int contrast, int saturation)
{
const int isRgb = c->dstFormat == AV_PIX_FMT_RGB32 ||
c->dstFormat == AV_PIX_FMT_RGB32_1 ||
c->dstFormat == AV_PIX_FMT_BGR24 ||
c->dstFormat == AV_PIX_FMT_RGB565BE ||
c->dstFormat == AV_PIX_FMT_RGB565LE ||
c->dstFormat == AV_PIX_FMT_RGB555BE ||
c->dstFormat == AV_PIX_FMT_RGB555LE ||
c->dstFormat == AV_PIX_FMT_RGB444BE ||
c->dstFormat == AV_PIX_FMT_RGB444LE ||
c->dstFormat == AV_PIX_FMT_RGB8 ||
c->dstFormat == AV_PIX_FMT_RGB4 ||
c->dstFormat == AV_PIX_FMT_RGB4_BYTE ||
c->dstFormat == AV_PIX_FMT_MONOBLACK;
const int isNotNe = c->dstFormat == AV_PIX_FMT_NE(RGB565LE, RGB565BE) ||
c->dstFormat == AV_PIX_FMT_NE(RGB555LE, RGB555BE) ||
c->dstFormat == AV_PIX_FMT_NE(RGB444LE, RGB444BE) ||
c->dstFormat == AV_PIX_FMT_NE(BGR565LE, BGR565BE) ||
c->dstFormat == AV_PIX_FMT_NE(BGR555LE, BGR555BE) ||
c->dstFormat == AV_PIX_FMT_NE(BGR444LE, BGR444BE);
const int bpp = c->dstFormatBpp;
uint8_t *y_table;
uint16_t *y_table16;
uint32_t *y_table32;
int i, base, rbase, gbase, bbase, av_uninit(abase), needAlpha;
const int yoffs = (fullRange ? 384 : 326) + YUVRGB_TABLE_LUMA_HEADROOM;
const int table_plane_size = 1024 + 2*YUVRGB_TABLE_LUMA_HEADROOM;
int64_t crv = inv_table[0];
int64_t cbu = inv_table[1];
int64_t cgu = -inv_table[2];
int64_t cgv = -inv_table[3];
int64_t cy = 1 << 16;
int64_t oy = 0;
int64_t yb = 0;
if (!fullRange) {
cy = (cy * 255) / 219;
oy = 16 << 16;
} else {
crv = (crv * 224) / 255;
cbu = (cbu * 224) / 255;
cgu = (cgu * 224) / 255;
cgv = (cgv * 224) / 255;
}
cy = (cy * contrast) >> 16;
crv = (crv * contrast * saturation) >> 32;
cbu = (cbu * contrast * saturation) >> 32;
cgu = (cgu * contrast * saturation) >> 32;
cgv = (cgv * contrast * saturation) >> 32;
oy -= 256 * brightness;
c->uOffset = 0x0400040004000400LL;
c->vOffset = 0x0400040004000400LL;
c->yCoeff = roundToInt16(cy * 8192) * 0x0001000100010001ULL;
c->vrCoeff = roundToInt16(crv * 8192) * 0x0001000100010001ULL;
c->ubCoeff = roundToInt16(cbu * 8192) * 0x0001000100010001ULL;
c->vgCoeff = roundToInt16(cgv * 8192) * 0x0001000100010001ULL;
c->ugCoeff = roundToInt16(cgu * 8192) * 0x0001000100010001ULL;
c->yOffset = roundToInt16(oy * 8) * 0x0001000100010001ULL;
c->yuv2rgb_y_coeff = (int16_t)roundToInt16(cy << 13);
c->yuv2rgb_y_offset = (int16_t)roundToInt16(oy << 9);
c->yuv2rgb_v2r_coeff = (int16_t)roundToInt16(crv << 13);
c->yuv2rgb_v2g_coeff = (int16_t)roundToInt16(cgv << 13);
c->yuv2rgb_u2g_coeff = (int16_t)roundToInt16(cgu << 13);
c->yuv2rgb_u2b_coeff = (int16_t)roundToInt16(cbu << 13);
//scale coefficients by cy
crv = ((crv << 16) + 0x8000) / FFMAX(cy, 1);
cbu = ((cbu << 16) + 0x8000) / FFMAX(cy, 1);
cgu = ((cgu << 16) + 0x8000) / FFMAX(cy, 1);
cgv = ((cgv << 16) + 0x8000) / FFMAX(cy, 1);
av_freep(&c->yuvTable);
#define ALLOC_YUV_TABLE(x) \
c->yuvTable = av_malloc(x); \
if (!c->yuvTable) \
return AVERROR(ENOMEM);
switch (bpp) {
case 1:
ALLOC_YUV_TABLE(table_plane_size);
y_table = c->yuvTable;
yb = -(384 << 16) - YUVRGB_TABLE_LUMA_HEADROOM*cy - oy;
for (i = 0; i < table_plane_size - 110; i++) {
y_table[i + 110] = av_clip_uint8((yb + 0x8000) >> 16) >> 7;
yb += cy;
}
fill_table(c->table_gU, 1, cgu, y_table + yoffs);
fill_gv_table(c->table_gV, 1, cgv);
break;
case 4:
case 4 | 128:
rbase = isRgb ? 3 : 0;
gbase = 1;
bbase = isRgb ? 0 : 3;
ALLOC_YUV_TABLE(table_plane_size * 3);
y_table = c->yuvTable;
yb = -(384 << 16) - YUVRGB_TABLE_LUMA_HEADROOM*cy - oy;
for (i = 0; i < table_plane_size - 110; i++) {
int yval = av_clip_uint8((yb + 0x8000) >> 16);
y_table[i + 110] = (yval >> 7) << rbase;
y_table[i + 37 + table_plane_size] = ((yval + 43) / 85) << gbase;
y_table[i + 110 + 2*table_plane_size] = (yval >> 7) << bbase;
yb += cy;
}
fill_table(c->table_rV, 1, crv, y_table + yoffs);
fill_table(c->table_gU, 1, cgu, y_table + yoffs + table_plane_size);
fill_table(c->table_bU, 1, cbu, y_table + yoffs + 2*table_plane_size);
fill_gv_table(c->table_gV, 1, cgv);
break;
case 8:
rbase = isRgb ? 5 : 0;
gbase = isRgb ? 2 : 3;
bbase = isRgb ? 0 : 6;
ALLOC_YUV_TABLE(table_plane_size * 3);
y_table = c->yuvTable;
yb = -(384 << 16) - YUVRGB_TABLE_LUMA_HEADROOM*cy - oy;
for (i = 0; i < table_plane_size - 38; i++) {
int yval = av_clip_uint8((yb + 0x8000) >> 16);
y_table[i + 16] = ((yval + 18) / 36) << rbase;
y_table[i + 16 + table_plane_size] = ((yval + 18) / 36) << gbase;
y_table[i + 37 + 2*table_plane_size] = ((yval + 43) / 85) << bbase;
yb += cy;
}
fill_table(c->table_rV, 1, crv, y_table + yoffs);
fill_table(c->table_gU, 1, cgu, y_table + yoffs + table_plane_size);
fill_table(c->table_bU, 1, cbu, y_table + yoffs + 2*table_plane_size);
fill_gv_table(c->table_gV, 1, cgv);
break;
case 12:
rbase = isRgb ? 8 : 0;
gbase = 4;
bbase = isRgb ? 0 : 8;
ALLOC_YUV_TABLE(table_plane_size * 3 * 2);
y_table16 = c->yuvTable;
yb = -(384 << 16) - YUVRGB_TABLE_LUMA_HEADROOM*cy - oy;
for (i = 0; i < table_plane_size; i++) {
uint8_t yval = av_clip_uint8((yb + 0x8000) >> 16);
y_table16[i] = (yval >> 4) << rbase;
y_table16[i + table_plane_size] = (yval >> 4) << gbase;
y_table16[i + 2*table_plane_size] = (yval >> 4) << bbase;
yb += cy;
}
if (isNotNe)
for (i = 0; i < table_plane_size * 3; i++)
y_table16[i] = av_bswap16(y_table16[i]);
fill_table(c->table_rV, 2, crv, y_table16 + yoffs);
fill_table(c->table_gU, 2, cgu, y_table16 + yoffs + table_plane_size);
fill_table(c->table_bU, 2, cbu, y_table16 + yoffs + 2*table_plane_size);
fill_gv_table(c->table_gV, 2, cgv);
break;
case 15:
case 16:
rbase = isRgb ? bpp - 5 : 0;
gbase = 5;
bbase = isRgb ? 0 : (bpp - 5);
ALLOC_YUV_TABLE(table_plane_size * 3 * 2);
y_table16 = c->yuvTable;
yb = -(384 << 16) - YUVRGB_TABLE_LUMA_HEADROOM*cy - oy;
for (i = 0; i < table_plane_size; i++) {
uint8_t yval = av_clip_uint8((yb + 0x8000) >> 16);
y_table16[i] = (yval >> 3) << rbase;
y_table16[i + table_plane_size] = (yval >> (18 - bpp)) << gbase;
y_table16[i + 2*table_plane_size] = (yval >> 3) << bbase;
yb += cy;
}
if (isNotNe)
for (i = 0; i < table_plane_size * 3; i++)
y_table16[i] = av_bswap16(y_table16[i]);
fill_table(c->table_rV, 2, crv, y_table16 + yoffs);
fill_table(c->table_gU, 2, cgu, y_table16 + yoffs + table_plane_size);
fill_table(c->table_bU, 2, cbu, y_table16 + yoffs + 2*table_plane_size);
fill_gv_table(c->table_gV, 2, cgv);
break;
case 24:
case 48:
ALLOC_YUV_TABLE(table_plane_size);
y_table = c->yuvTable;
yb = -(384 << 16) - YUVRGB_TABLE_LUMA_HEADROOM*cy - oy;
for (i = 0; i < table_plane_size; i++) {
y_table[i] = av_clip_uint8((yb + 0x8000) >> 16);
yb += cy;
}
fill_table(c->table_rV, 1, crv, y_table + yoffs);
fill_table(c->table_gU, 1, cgu, y_table + yoffs);
fill_table(c->table_bU, 1, cbu, y_table + yoffs);
fill_gv_table(c->table_gV, 1, cgv);
break;
case 32:
case 64:
base = (c->dstFormat == AV_PIX_FMT_RGB32_1 ||
c->dstFormat == AV_PIX_FMT_BGR32_1) ? 8 : 0;
rbase = base + (isRgb ? 16 : 0);
gbase = base + 8;
bbase = base + (isRgb ? 0 : 16);
needAlpha = CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat);
if (!needAlpha)
abase = (base + 24) & 31;
ALLOC_YUV_TABLE(table_plane_size * 3 * 4);
y_table32 = c->yuvTable;
yb = -(384 << 16) - YUVRGB_TABLE_LUMA_HEADROOM*cy - oy;
for (i = 0; i < table_plane_size; i++) {
unsigned yval = av_clip_uint8((yb + 0x8000) >> 16);
y_table32[i] = (yval << rbase) +
(needAlpha ? 0 : (255u << abase));
y_table32[i + table_plane_size] = yval << gbase;
y_table32[i + 2*table_plane_size] = yval << bbase;
yb += cy;
}
fill_table(c->table_rV, 4, crv, y_table32 + yoffs);
fill_table(c->table_gU, 4, cgu, y_table32 + yoffs + table_plane_size);
fill_table(c->table_bU, 4, cbu, y_table32 + yoffs + 2*table_plane_size);
fill_gv_table(c->table_gV, 4, cgv);
break;
default:
if(!isPlanar(c->dstFormat) || bpp <= 24)
av_log(c, AV_LOG_ERROR, "%ibpp not supported by yuv2rgb\n", bpp);
return -1;
}
return 0;
}
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