/* * Original MPlayer filters by Richard Felker, Hampa Hug, Daniel Moreno, * and Michael Niedermeyer. * * Copyright (c) 2014 James Darnley <james.darnley@gmail.com> * Copyright (c) 2015 Arwa Arif <arwaarif1994@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 General Public License as published by * the Free Software Foundation; either version 2 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 General Public License for more details. * * You should have received a copy of the GNU 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. */ /** * @file * very simple video equalizer */ #include "libavfilter/internal.h" #include "libavutil/common.h" #include "libavutil/imgutils.h" #include "libavutil/opt.h" #include "libavutil/pixdesc.h" #include "vf_eq.h" static void create_lut(EQParameters *param) { int i; double g = 1.0 / param->gamma; double lw = 1.0 - param->gamma_weight; for (i = 0; i < 256; i++) { double v = i / 255.0; v = param->contrast * (v - 0.5) + 0.5 + param->brightness; if (v <= 0.0) { param->lut[i] = 0; } else { v = v * lw + pow(v, g) * param->gamma_weight; if (v >= 1.0) param->lut[i] = 255; else param->lut[i] = 256.0 * v; } } param->lut_clean = 1; } static void apply_lut(EQParameters *param, uint8_t *dst, int dst_stride, const uint8_t *src, int src_stride, int w, int h) { int x, y; if (!param->lut_clean) create_lut(param); for (y = 0; y < h; y++) { for (x = 0; x < w; x++) { dst[y * dst_stride + x] = param->lut[src[y * src_stride + x]]; } } } static void process_c(EQParameters *param, uint8_t *dst, int dst_stride, const uint8_t *src, int src_stride, int w, int h) { int x, y, pel; int contrast = (int) (param->contrast * 256 * 16); int brightness = ((int) (100.0 * param->brightness + 100.0) * 511) / 200 - 128 - contrast / 32; for (y = 0; y < h; y++) { for (x = 0; x < w; x++) { pel = ((src[y * src_stride + x] * contrast) >> 12) + brightness; if (pel & ~255) pel = (-pel) >> 31; dst[y * dst_stride + x] = pel; } } } static void check_values(EQParameters *param, EQContext *eq) { if (param->contrast == 1.0 && param->brightness == 0.0 && param->gamma == 1.0) param->adjust = NULL; else if (param->gamma == 1.0) param->adjust = eq->process; else param->adjust = apply_lut; } static void set_contrast(EQContext *eq) { eq->contrast = av_clipf(av_expr_eval(eq->contrast_pexpr, eq->var_values, eq), -2.0, 2.0); eq->param[0].contrast = eq->contrast; eq->param[0].lut_clean = 0; check_values(&eq->param[0], eq); } static void set_brightness(EQContext *eq) { eq->brightness = av_clipf(av_expr_eval(eq->brightness_pexpr, eq->var_values, eq), -1.0, 1.0); eq->param[0].brightness = eq->brightness; eq->param[0].lut_clean = 0; check_values(&eq->param[0], eq); } static void set_gamma(EQContext *eq) { int i; eq->gamma = av_clipf(av_expr_eval(eq->gamma_pexpr, eq->var_values, eq), 0.1, 10.0); eq->gamma_r = av_clipf(av_expr_eval(eq->gamma_r_pexpr, eq->var_values, eq), 0.1, 10.0); eq->gamma_g = av_clipf(av_expr_eval(eq->gamma_g_pexpr, eq->var_values, eq), 0.1, 10.0); eq->gamma_b = av_clipf(av_expr_eval(eq->gamma_b_pexpr, eq->var_values, eq), 0.1, 10.0); eq->gamma_weight = av_clipf(av_expr_eval(eq->gamma_weight_pexpr, eq->var_values, eq), 0.0, 1.0); eq->param[0].gamma = eq->gamma * eq->gamma_g; eq->param[1].gamma = sqrt(eq->gamma_b / eq->gamma_g); eq->param[2].gamma = sqrt(eq->gamma_r / eq->gamma_g); for (i = 0; i < 3; i++) { eq->param[i].gamma_weight = eq->gamma_weight; eq->param[i].lut_clean = 0; check_values(&eq->param[i], eq); } } static void set_saturation(EQContext *eq) { int i; eq->saturation = av_clipf(av_expr_eval(eq->saturation_pexpr, eq->var_values, eq), 0.0, 3.0); for (i = 1; i < 3; i++) { eq->param[i].contrast = eq->saturation; eq->param[i].lut_clean = 0; check_values(&eq->param[i], eq); } } static int set_expr(AVExpr **pexpr, const char *expr, const char *option, void *log_ctx) { int ret; AVExpr *old = NULL; if (*pexpr) old = *pexpr; ret = av_expr_parse(pexpr, expr, var_names, NULL, NULL, NULL, NULL, 0, log_ctx); if (ret < 0) { av_log(log_ctx, AV_LOG_ERROR, "Error when parsing the expression '%s' for %s\n", expr, option); *pexpr = old; return ret; } av_expr_free(old); return 0; } static int initialize(AVFilterContext *ctx) { EQContext *eq = ctx->priv; int ret; eq->process = process_c; if ((ret = set_expr(&eq->contrast_pexpr, eq->contrast_expr, "contrast", ctx)) < 0 || (ret = set_expr(&eq->brightness_pexpr, eq->brightness_expr, "brightness", ctx)) < 0 || (ret = set_expr(&eq->saturation_pexpr, eq->saturation_expr, "saturation", ctx)) < 0 || (ret = set_expr(&eq->gamma_pexpr, eq->gamma_expr, "gamma", ctx)) < 0 || (ret = set_expr(&eq->gamma_r_pexpr, eq->gamma_r_expr, "gamma_r", ctx)) < 0 || (ret = set_expr(&eq->gamma_g_pexpr, eq->gamma_g_expr, "gamma_g", ctx)) < 0 || (ret = set_expr(&eq->gamma_b_pexpr, eq->gamma_b_expr, "gamma_b", ctx)) < 0 || (ret = set_expr(&eq->gamma_weight_pexpr, eq->gamma_weight_expr, "gamma_weight", ctx)) < 0 ) return ret; if (ARCH_X86) ff_eq_init_x86(eq); if (eq->eval_mode == EVAL_MODE_INIT) { set_gamma(eq); set_contrast(eq); set_brightness(eq); set_saturation(eq); } return 0; } static void uninit(AVFilterContext *ctx) { EQContext *eq = ctx->priv; av_expr_free(eq->contrast_pexpr); eq->contrast_pexpr = NULL; av_expr_free(eq->brightness_pexpr); eq->brightness_pexpr = NULL; av_expr_free(eq->saturation_pexpr); eq->saturation_pexpr = NULL; av_expr_free(eq->gamma_pexpr); eq->gamma_pexpr = NULL; av_expr_free(eq->gamma_weight_pexpr); eq->gamma_weight_pexpr = NULL; av_expr_free(eq->gamma_r_pexpr); eq->gamma_r_pexpr = NULL; av_expr_free(eq->gamma_g_pexpr); eq->gamma_g_pexpr = NULL; av_expr_free(eq->gamma_b_pexpr); eq->gamma_b_pexpr = NULL; } static int config_props(AVFilterLink *inlink) { EQContext *eq = inlink->dst->priv; eq->var_values[VAR_N] = 0; eq->var_values[VAR_R] = inlink->frame_rate.num == 0 || inlink->frame_rate.den == 0 ? NAN : av_q2d(inlink->frame_rate); return 0; } static int query_formats(AVFilterContext *ctx) { static const enum AVPixelFormat pixel_fmts_eq[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_NONE }; AVFilterFormats *fmts_list = ff_make_format_list(pixel_fmts_eq); if (!fmts_list) return AVERROR(ENOMEM); return ff_set_common_formats(ctx, fmts_list); } #define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts) * av_q2d(tb)) static int filter_frame(AVFilterLink *inlink, AVFrame *in) { AVFilterContext *ctx = inlink->dst; AVFilterLink *outlink = inlink->dst->outputs[0]; EQContext *eq = ctx->priv; AVFrame *out; int64_t pos = av_frame_get_pkt_pos(in); const AVPixFmtDescriptor *desc; int i; out = ff_get_video_buffer(outlink, inlink->w, inlink->h); if (!out) return AVERROR(ENOMEM); av_frame_copy_props(out, in); desc = av_pix_fmt_desc_get(inlink->format); eq->var_values[VAR_N] = inlink->frame_count; eq->var_values[VAR_POS] = pos == -1 ? NAN : pos; eq->var_values[VAR_T] = TS2T(in->pts, inlink->time_base); if (eq->eval_mode == EVAL_MODE_FRAME) { set_gamma(eq); set_contrast(eq); set_brightness(eq); set_saturation(eq); } for (i = 0; i < desc->nb_components; i++) { int w = inlink->w; int h = inlink->h; if (i == 1 || i == 2) { w = FF_CEIL_RSHIFT(w, desc->log2_chroma_w); h = FF_CEIL_RSHIFT(h, desc->log2_chroma_h); } if (eq->param[i].adjust) eq->param[i].adjust(&eq->param[i], out->data[i], out->linesize[i], in->data[i], in->linesize[i], w, h); else av_image_copy_plane(out->data[i], out->linesize[i], in->data[i], in->linesize[i], w, h); } av_frame_free(&in); return ff_filter_frame(outlink, out); } static inline int set_param(AVExpr **pexpr, const char *args, const char *cmd, void (*set_fn)(EQContext *eq), AVFilterContext *ctx) { EQContext *eq = ctx->priv; int ret; if ((ret = set_expr(pexpr, args, cmd, ctx)) < 0) return ret; if (eq->eval_mode == EVAL_MODE_INIT) set_fn(eq); return 0; } static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags) { EQContext *eq = ctx->priv; #define SET_PARAM(param_name, set_fn_name) \ if (!strcmp(cmd, #param_name)) return set_param(&eq->param_name##_pexpr, args, cmd, set_##set_fn_name, ctx); SET_PARAM(contrast, contrast) else SET_PARAM(brightness, brightness) else SET_PARAM(saturation, saturation) else SET_PARAM(gamma, gamma) else SET_PARAM(gamma_r, gamma) else SET_PARAM(gamma_g, gamma) else SET_PARAM(gamma_b, gamma) else SET_PARAM(gamma_weight, gamma) else return AVERROR(ENOSYS); } static const AVFilterPad eq_inputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, .filter_frame = filter_frame, .config_props = config_props, }, { NULL } }; static const AVFilterPad eq_outputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, }, { NULL } }; #define OFFSET(x) offsetof(EQContext, x) #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM static const AVOption eq_options[] = { { "contrast", "set the contrast adjustment, negative values give a negative image", OFFSET(contrast_expr), AV_OPT_TYPE_STRING, {.str = "1.0"}, CHAR_MIN, CHAR_MAX, FLAGS }, { "brightness", "set the brightness adjustment", OFFSET(brightness_expr), AV_OPT_TYPE_STRING, {.str = "0.0"}, CHAR_MIN, CHAR_MAX, FLAGS }, { "saturation", "set the saturation adjustment", OFFSET(saturation_expr), AV_OPT_TYPE_STRING, {.str = "1.0"}, CHAR_MIN, CHAR_MAX, FLAGS }, { "gamma", "set the initial gamma value", OFFSET(gamma_expr), AV_OPT_TYPE_STRING, {.str = "1.0"}, CHAR_MIN, CHAR_MAX, FLAGS }, { "gamma_r", "gamma value for red", OFFSET(gamma_r_expr), AV_OPT_TYPE_STRING, {.str = "1.0"}, CHAR_MIN, CHAR_MAX, FLAGS }, { "gamma_g", "gamma value for green", OFFSET(gamma_g_expr), AV_OPT_TYPE_STRING, {.str = "1.0"}, CHAR_MIN, CHAR_MAX, FLAGS }, { "gamma_b", "gamma value for blue", OFFSET(gamma_b_expr), AV_OPT_TYPE_STRING, {.str = "1.0"}, CHAR_MIN, CHAR_MAX, FLAGS }, { "gamma_weight", "set the gamma weight which reduces the effect of gamma on bright areas", OFFSET(gamma_weight_expr), AV_OPT_TYPE_STRING, {.str = "1.0"}, CHAR_MIN, CHAR_MAX, FLAGS }, { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, "eval" }, { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" }, { "frame", "eval expressions per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" }, { NULL } }; AVFILTER_DEFINE_CLASS(eq); AVFilter ff_vf_eq = { .name = "eq", .description = NULL_IF_CONFIG_SMALL("Adjust brightness, contrast, gamma, and saturation."), .priv_size = sizeof(EQContext), .priv_class = &eq_class, .inputs = eq_inputs, .outputs = eq_outputs, .process_command = process_command, .query_formats = query_formats, .init = initialize, .uninit = uninit, };