| /* |
| * 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 && fabs(param->contrast) < 7.9) |
| 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), -1000.0, 1000.0); |
| 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; |
| } |
| |
| void ff_eq_init(EQContext *eq) |
| { |
| eq->process = process_c; |
| if (ARCH_X86) |
| ff_eq_init_x86(eq); |
| } |
| |
| static int initialize(AVFilterContext *ctx) |
| { |
| EQContext *eq = ctx->priv; |
| int ret; |
| ff_eq_init(eq); |
| |
| 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 (eq->eval_mode == EVAL_MODE_INIT) { |
| set_gamma(eq); |
| set_contrast(eq); |
| set_brightness(eq); |
| set_saturation(eq); |
| } |
| |
| return 0; |
| } |
| |
| static av_cold 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); |
| } |
| |
| 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 = in->pkt_pos; |
| const AVPixFmtDescriptor *desc; |
| int i; |
| |
| out = ff_get_video_buffer(outlink, inlink->w, inlink->h); |
| if (!out) { |
| av_frame_free(&in); |
| 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_out; |
| 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 = AV_CEIL_RSHIFT(w, desc->log2_chroma_w); |
| h = AV_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 |
| #define TFLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_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"}, 0, 0, TFLAGS }, |
| { "brightness", "set the brightness adjustment", |
| OFFSET(brightness_expr), AV_OPT_TYPE_STRING, {.str = "0.0"}, 0, 0, TFLAGS }, |
| { "saturation", "set the saturation adjustment", |
| OFFSET(saturation_expr), AV_OPT_TYPE_STRING, {.str = "1.0"}, 0, 0, TFLAGS }, |
| { "gamma", "set the initial gamma value", |
| OFFSET(gamma_expr), AV_OPT_TYPE_STRING, {.str = "1.0"}, 0, 0, TFLAGS }, |
| { "gamma_r", "gamma value for red", |
| OFFSET(gamma_r_expr), AV_OPT_TYPE_STRING, {.str = "1.0"}, 0, 0, TFLAGS }, |
| { "gamma_g", "gamma value for green", |
| OFFSET(gamma_g_expr), AV_OPT_TYPE_STRING, {.str = "1.0"}, 0, 0, TFLAGS }, |
| { "gamma_b", "gamma value for blue", |
| OFFSET(gamma_b_expr), AV_OPT_TYPE_STRING, {.str = "1.0"}, 0, 0, TFLAGS }, |
| { "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"}, 0, 0, TFLAGS }, |
| { "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, |
| .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
| }; |
