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-rw-r--r--libavfilter/vf_eq.c388
1 files changed, 388 insertions, 0 deletions
diff --git a/libavfilter/vf_eq.c b/libavfilter/vf_eq.c
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+++ b/libavfilter/vf_eq.c
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+/*
+ * 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;
+}
+
+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,
+};
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