diff options
Diffstat (limited to 'media/ffvpx/libavutil/color_utils.c')
| -rw-r--r-- | media/ffvpx/libavutil/color_utils.c | 234 |
1 files changed, 0 insertions, 234 deletions
diff --git a/media/ffvpx/libavutil/color_utils.c b/media/ffvpx/libavutil/color_utils.c deleted file mode 100644 index 5e221fb798..0000000000 --- a/media/ffvpx/libavutil/color_utils.c +++ /dev/null @@ -1,234 +0,0 @@ -/* - * Copyright (c) 2015 Kevin Wheatley <kevin.j.wheatley@gmail.com> - * - * 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 <stddef.h> -#include <math.h> - -#include "libavutil/color_utils.h" -#include "libavutil/pixfmt.h" - -double avpriv_get_gamma_from_trc(enum AVColorTransferCharacteristic trc) -{ - double gamma; - switch (trc) { - case AVCOL_TRC_BT709: - case AVCOL_TRC_SMPTE170M: - case AVCOL_TRC_SMPTE240M: - case AVCOL_TRC_BT1361_ECG: - case AVCOL_TRC_BT2020_10: - case AVCOL_TRC_BT2020_12: - /* these share a segmented TRC, but gamma 1.961 is a close - approximation, and also more correct for decoding content */ - gamma = 1.961; - break; - case AVCOL_TRC_GAMMA22: - case AVCOL_TRC_IEC61966_2_1: - gamma = 2.2; - break; - case AVCOL_TRC_GAMMA28: - gamma = 2.8; - break; - case AVCOL_TRC_LINEAR: - gamma = 1.0; - break; - default: - gamma = 0.0; // Unknown value representation - } - return gamma; -} - -#define BT709_alpha 1.099296826809442 -#define BT709_beta 0.018053968510807 - -static double avpriv_trc_bt709(double Lc) -{ - const double a = BT709_alpha; - const double b = BT709_beta; - - return (0.0 > Lc) ? 0.0 - : ( b > Lc) ? 4.500 * Lc - : a * pow(Lc, 0.45) - (a - 1.0); -} - -static double avpriv_trc_gamma22(double Lc) -{ - return (0.0 > Lc) ? 0.0 : pow(Lc, 1.0/ 2.2); -} - -static double avpriv_trc_gamma28(double Lc) -{ - return (0.0 > Lc) ? 0.0 : pow(Lc, 1.0/ 2.8); -} - -static double avpriv_trc_smpte240M(double Lc) -{ - const double a = 1.1115; - const double b = 0.0228; - - return (0.0 > Lc) ? 0.0 - : ( b > Lc) ? 4.000 * Lc - : a * pow(Lc, 0.45) - (a - 1.0); -} - -static double avpriv_trc_linear(double Lc) -{ - return Lc; -} - -static double avpriv_trc_log(double Lc) -{ - return (0.01 > Lc) ? 0.0 : 1.0 + log10(Lc) / 2.0; -} - -static double avpriv_trc_log_sqrt(double Lc) -{ - // sqrt(10) / 1000 - return (0.00316227766 > Lc) ? 0.0 : 1.0 + log10(Lc) / 2.5; -} - -static double avpriv_trc_iec61966_2_4(double Lc) -{ - const double a = BT709_alpha; - const double b = BT709_beta; - - return (-b >= Lc) ? -a * pow(-Lc, 0.45) + (a - 1.0) - : ( b > Lc) ? 4.500 * Lc - : a * pow( Lc, 0.45) - (a - 1.0); -} - -static double avpriv_trc_bt1361(double Lc) -{ - const double a = BT709_alpha; - const double b = BT709_beta; - - return (-0.0045 >= Lc) ? -(a * pow(-4.0 * Lc, 0.45) + (a - 1.0)) / 4.0 - : ( b > Lc) ? 4.500 * Lc - : a * pow( Lc, 0.45) - (a - 1.0); -} - -static double avpriv_trc_iec61966_2_1(double Lc) -{ - const double a = 1.055; - const double b = 0.0031308; - - return (0.0 > Lc) ? 0.0 - : ( b > Lc) ? 12.92 * Lc - : a * pow(Lc, 1.0 / 2.4) - (a - 1.0); -} - -static double avpriv_trc_smpte_st2084(double Lc) -{ - const double c1 = 3424.0 / 4096.0; // c3-c2 + 1 - const double c2 = 32.0 * 2413.0 / 4096.0; - const double c3 = 32.0 * 2392.0 / 4096.0; - const double m = 128.0 * 2523.0 / 4096.0; - const double n = 0.25 * 2610.0 / 4096.0; - const double L = Lc / 10000.0; - const double Ln = pow(L, n); - - return (0.0 > Lc) ? 0.0 - : pow((c1 + c2 * Ln) / (1.0 + c3 * Ln), m); - -} - -static double avpriv_trc_smpte_st428_1(double Lc) -{ - return (0.0 > Lc) ? 0.0 - : pow(48.0 * Lc / 52.37, 1.0 / 2.6); -} - - -static double avpriv_trc_arib_std_b67(double Lc) { - // The function uses the definition from HEVC, which assumes that the peak - // white is input level = 1. (this is equivalent to scaling E = Lc * 12 and - // using the definition from the ARIB STD-B67 spec) - const double a = 0.17883277; - const double b = 0.28466892; - const double c = 0.55991073; - return (0.0 > Lc) ? 0.0 : - (Lc <= 1.0 / 12.0 ? sqrt(3.0 * Lc) : a * log(12.0 * Lc - b) + c); -} - -avpriv_trc_function avpriv_get_trc_function_from_trc(enum AVColorTransferCharacteristic trc) -{ - avpriv_trc_function func = NULL; - switch (trc) { - case AVCOL_TRC_BT709: - case AVCOL_TRC_SMPTE170M: - case AVCOL_TRC_BT2020_10: - case AVCOL_TRC_BT2020_12: - func = avpriv_trc_bt709; - break; - - case AVCOL_TRC_GAMMA22: - func = avpriv_trc_gamma22; - break; - case AVCOL_TRC_GAMMA28: - func = avpriv_trc_gamma28; - break; - - case AVCOL_TRC_SMPTE240M: - func = avpriv_trc_smpte240M; - break; - - case AVCOL_TRC_LINEAR: - func = avpriv_trc_linear; - break; - - case AVCOL_TRC_LOG: - func = avpriv_trc_log; - break; - - case AVCOL_TRC_LOG_SQRT: - func = avpriv_trc_log_sqrt; - break; - - case AVCOL_TRC_IEC61966_2_4: - func = avpriv_trc_iec61966_2_4; - break; - - case AVCOL_TRC_BT1361_ECG: - func = avpriv_trc_bt1361; - break; - - case AVCOL_TRC_IEC61966_2_1: - func = avpriv_trc_iec61966_2_1; - break; - - case AVCOL_TRC_SMPTEST2084: - func = avpriv_trc_smpte_st2084; - break; - - case AVCOL_TRC_SMPTEST428_1: - func = avpriv_trc_smpte_st428_1; - break; - - case AVCOL_TRC_ARIB_STD_B67: - func = avpriv_trc_arib_std_b67; - break; - - case AVCOL_TRC_RESERVED0: - case AVCOL_TRC_UNSPECIFIED: - case AVCOL_TRC_RESERVED: - default: - break; - } - return func; -} |