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![Nicolas George](/assets/img/avatar_default.png)
AVFilterLink.frame_count is supposed to count the number of frames that were passed on the link, but with min_samples, that number is not always the same for the source and destination filters. With the addition of a FIFO on the link, the difference will become more significant. Split the variable in two: frame_count_in counts the number of frames that entered the link, frame_count_out counts the number of frames that were sent to the destination filter.
454 lines
14 KiB
C
454 lines
14 KiB
C
/*
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* Copyright (c) 2003 Michael Niedermayer
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* Copyright (c) 2012 Jeremy Tran
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Apply a hue/saturation filter to the input video
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* Ported from MPlayer libmpcodecs/vf_hue.c.
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*/
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#include <float.h>
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#include "libavutil/eval.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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#define SAT_MIN_VAL -10
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#define SAT_MAX_VAL 10
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static const char *const var_names[] = {
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"n", // frame count
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"pts", // presentation timestamp expressed in AV_TIME_BASE units
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"r", // frame rate
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"t", // timestamp expressed in seconds
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"tb", // timebase
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NULL
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};
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enum var_name {
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VAR_N,
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VAR_PTS,
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VAR_R,
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VAR_T,
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VAR_TB,
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VAR_NB
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};
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typedef struct {
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const AVClass *class;
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float hue_deg; /* hue expressed in degrees */
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float hue; /* hue expressed in radians */
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char *hue_deg_expr;
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char *hue_expr;
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AVExpr *hue_deg_pexpr;
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AVExpr *hue_pexpr;
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float saturation;
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char *saturation_expr;
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AVExpr *saturation_pexpr;
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float brightness;
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char *brightness_expr;
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AVExpr *brightness_pexpr;
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int hsub;
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int vsub;
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int is_first;
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int32_t hue_sin;
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int32_t hue_cos;
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double var_values[VAR_NB];
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uint8_t lut_l[256];
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uint8_t lut_u[256][256];
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uint8_t lut_v[256][256];
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} HueContext;
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#define OFFSET(x) offsetof(HueContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption hue_options[] = {
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{ "h", "set the hue angle degrees expression", OFFSET(hue_deg_expr), AV_OPT_TYPE_STRING,
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{ .str = NULL }, .flags = FLAGS },
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{ "s", "set the saturation expression", OFFSET(saturation_expr), AV_OPT_TYPE_STRING,
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{ .str = "1" }, .flags = FLAGS },
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{ "H", "set the hue angle radians expression", OFFSET(hue_expr), AV_OPT_TYPE_STRING,
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{ .str = NULL }, .flags = FLAGS },
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{ "b", "set the brightness expression", OFFSET(brightness_expr), AV_OPT_TYPE_STRING,
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{ .str = "0" }, .flags = FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(hue);
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static inline void compute_sin_and_cos(HueContext *hue)
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{
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/*
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* Scale the value to the norm of the resulting (U,V) vector, that is
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* the saturation.
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* This will be useful in the apply_lut function.
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*/
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hue->hue_sin = lrint(sin(hue->hue) * (1 << 16) * hue->saturation);
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hue->hue_cos = lrint(cos(hue->hue) * (1 << 16) * hue->saturation);
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}
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static inline void create_luma_lut(HueContext *h)
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{
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const float b = h->brightness;
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int i;
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for (i = 0; i < 256; i++) {
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h->lut_l[i] = av_clip_uint8(i + b * 25.5);
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}
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}
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static inline void create_chrominance_lut(HueContext *h, const int32_t c,
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const int32_t s)
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{
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int32_t i, j, u, v, new_u, new_v;
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/*
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* If we consider U and V as the components of a 2D vector then its angle
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* is the hue and the norm is the saturation
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*/
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for (i = 0; i < 256; i++) {
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for (j = 0; j < 256; j++) {
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/* Normalize the components from range [16;140] to [-112;112] */
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u = i - 128;
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v = j - 128;
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/*
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* Apply the rotation of the vector : (c * u) - (s * v)
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* (s * u) + (c * v)
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* De-normalize the components (without forgetting to scale 128
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* by << 16)
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* Finally scale back the result by >> 16
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*/
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new_u = ((c * u) - (s * v) + (1 << 15) + (128 << 16)) >> 16;
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new_v = ((s * u) + (c * v) + (1 << 15) + (128 << 16)) >> 16;
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/* Prevent a potential overflow */
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h->lut_u[i][j] = av_clip_uint8(new_u);
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h->lut_v[i][j] = av_clip_uint8(new_v);
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}
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}
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}
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static int set_expr(AVExpr **pexpr_ptr, char **expr_ptr,
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const char *expr, const char *option, void *log_ctx)
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{
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int ret;
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AVExpr *new_pexpr;
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char *new_expr;
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new_expr = av_strdup(expr);
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if (!new_expr)
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return AVERROR(ENOMEM);
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ret = av_expr_parse(&new_pexpr, expr, var_names,
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NULL, NULL, NULL, NULL, 0, log_ctx);
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if (ret < 0) {
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av_log(log_ctx, AV_LOG_ERROR,
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"Error when evaluating the expression '%s' for %s\n",
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expr, option);
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av_free(new_expr);
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return ret;
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}
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if (*pexpr_ptr)
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av_expr_free(*pexpr_ptr);
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*pexpr_ptr = new_pexpr;
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av_freep(expr_ptr);
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*expr_ptr = new_expr;
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return 0;
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}
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static av_cold int init(AVFilterContext *ctx)
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{
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HueContext *hue = ctx->priv;
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int ret;
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if (hue->hue_expr && hue->hue_deg_expr) {
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av_log(ctx, AV_LOG_ERROR,
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"H and h options are incompatible and cannot be specified "
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"at the same time\n");
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return AVERROR(EINVAL);
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}
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#define SET_EXPR(expr, option) \
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if (hue->expr##_expr) do { \
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ret = set_expr(&hue->expr##_pexpr, &hue->expr##_expr, \
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hue->expr##_expr, option, ctx); \
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if (ret < 0) \
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return ret; \
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} while (0)
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SET_EXPR(brightness, "b");
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SET_EXPR(saturation, "s");
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SET_EXPR(hue_deg, "h");
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SET_EXPR(hue, "H");
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#undef SET_EXPR
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av_log(ctx, AV_LOG_VERBOSE,
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"H_expr:%s h_deg_expr:%s s_expr:%s b_expr:%s\n",
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hue->hue_expr, hue->hue_deg_expr, hue->saturation_expr, hue->brightness_expr);
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compute_sin_and_cos(hue);
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hue->is_first = 1;
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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HueContext *hue = ctx->priv;
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av_expr_free(hue->brightness_pexpr);
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av_expr_free(hue->hue_deg_pexpr);
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av_expr_free(hue->hue_pexpr);
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av_expr_free(hue->saturation_pexpr);
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}
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
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AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
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AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P,
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AV_PIX_FMT_YUVA420P,
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AV_PIX_FMT_NONE
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};
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AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
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if (!fmts_list)
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return AVERROR(ENOMEM);
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return ff_set_common_formats(ctx, fmts_list);
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}
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static int config_props(AVFilterLink *inlink)
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{
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HueContext *hue = inlink->dst->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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hue->hsub = desc->log2_chroma_w;
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hue->vsub = desc->log2_chroma_h;
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hue->var_values[VAR_N] = 0;
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hue->var_values[VAR_TB] = av_q2d(inlink->time_base);
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hue->var_values[VAR_R] = inlink->frame_rate.num == 0 || inlink->frame_rate.den == 0 ?
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NAN : av_q2d(inlink->frame_rate);
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return 0;
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}
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static void apply_luma_lut(HueContext *s,
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uint8_t *ldst, const int dst_linesize,
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uint8_t *lsrc, const int src_linesize,
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int w, int h)
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{
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int i;
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while (h--) {
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for (i = 0; i < w; i++)
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ldst[i] = s->lut_l[lsrc[i]];
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lsrc += src_linesize;
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ldst += dst_linesize;
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}
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}
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static void apply_lut(HueContext *s,
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uint8_t *udst, uint8_t *vdst, const int dst_linesize,
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uint8_t *usrc, uint8_t *vsrc, const int src_linesize,
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int w, int h)
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{
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int i;
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while (h--) {
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for (i = 0; i < w; i++) {
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const int u = usrc[i];
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const int v = vsrc[i];
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udst[i] = s->lut_u[u][v];
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vdst[i] = s->lut_v[u][v];
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}
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usrc += src_linesize;
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vsrc += src_linesize;
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udst += dst_linesize;
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vdst += dst_linesize;
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}
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}
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#define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
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#define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts) * av_q2d(tb))
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static int filter_frame(AVFilterLink *inlink, AVFrame *inpic)
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{
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HueContext *hue = inlink->dst->priv;
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AVFilterLink *outlink = inlink->dst->outputs[0];
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AVFrame *outpic;
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const int32_t old_hue_sin = hue->hue_sin, old_hue_cos = hue->hue_cos;
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const float old_brightness = hue->brightness;
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int direct = 0;
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if (av_frame_is_writable(inpic)) {
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direct = 1;
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outpic = inpic;
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} else {
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outpic = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!outpic) {
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av_frame_free(&inpic);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(outpic, inpic);
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}
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hue->var_values[VAR_N] = inlink->frame_count_out;
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hue->var_values[VAR_T] = TS2T(inpic->pts, inlink->time_base);
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hue->var_values[VAR_PTS] = TS2D(inpic->pts);
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if (hue->saturation_expr) {
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hue->saturation = av_expr_eval(hue->saturation_pexpr, hue->var_values, NULL);
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if (hue->saturation < SAT_MIN_VAL || hue->saturation > SAT_MAX_VAL) {
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hue->saturation = av_clip(hue->saturation, SAT_MIN_VAL, SAT_MAX_VAL);
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av_log(inlink->dst, AV_LOG_WARNING,
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"Saturation value not in range [%d,%d]: clipping value to %0.1f\n",
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SAT_MIN_VAL, SAT_MAX_VAL, hue->saturation);
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}
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}
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if (hue->brightness_expr) {
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hue->brightness = av_expr_eval(hue->brightness_pexpr, hue->var_values, NULL);
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if (hue->brightness < -10 || hue->brightness > 10) {
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hue->brightness = av_clipf(hue->brightness, -10, 10);
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av_log(inlink->dst, AV_LOG_WARNING,
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"Brightness value not in range [%d,%d]: clipping value to %0.1f\n",
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-10, 10, hue->brightness);
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}
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}
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if (hue->hue_deg_expr) {
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hue->hue_deg = av_expr_eval(hue->hue_deg_pexpr, hue->var_values, NULL);
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hue->hue = hue->hue_deg * M_PI / 180;
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} else if (hue->hue_expr) {
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hue->hue = av_expr_eval(hue->hue_pexpr, hue->var_values, NULL);
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hue->hue_deg = hue->hue * 180 / M_PI;
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}
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av_log(inlink->dst, AV_LOG_DEBUG,
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"H:%0.1f*PI h:%0.1f s:%0.1f b:%0.f t:%0.1f n:%d\n",
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hue->hue/M_PI, hue->hue_deg, hue->saturation, hue->brightness,
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hue->var_values[VAR_T], (int)hue->var_values[VAR_N]);
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compute_sin_and_cos(hue);
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if (hue->is_first || (old_hue_sin != hue->hue_sin || old_hue_cos != hue->hue_cos))
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create_chrominance_lut(hue, hue->hue_cos, hue->hue_sin);
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if (hue->is_first || (old_brightness != hue->brightness && hue->brightness))
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create_luma_lut(hue);
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if (!direct) {
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if (!hue->brightness)
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av_image_copy_plane(outpic->data[0], outpic->linesize[0],
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inpic->data[0], inpic->linesize[0],
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inlink->w, inlink->h);
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if (inpic->data[3])
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av_image_copy_plane(outpic->data[3], outpic->linesize[3],
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inpic->data[3], inpic->linesize[3],
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inlink->w, inlink->h);
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}
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apply_lut(hue, outpic->data[1], outpic->data[2], outpic->linesize[1],
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inpic->data[1], inpic->data[2], inpic->linesize[1],
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AV_CEIL_RSHIFT(inlink->w, hue->hsub),
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AV_CEIL_RSHIFT(inlink->h, hue->vsub));
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if (hue->brightness)
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apply_luma_lut(hue, outpic->data[0], outpic->linesize[0],
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inpic->data[0], inpic->linesize[0], inlink->w, inlink->h);
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if (!direct)
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av_frame_free(&inpic);
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hue->is_first = 0;
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return ff_filter_frame(outlink, outpic);
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}
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static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
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char *res, int res_len, int flags)
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{
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HueContext *hue = ctx->priv;
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int ret;
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#define SET_EXPR(expr, option) \
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do { \
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ret = set_expr(&hue->expr##_pexpr, &hue->expr##_expr, \
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args, option, ctx); \
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if (ret < 0) \
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return ret; \
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} while (0)
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if (!strcmp(cmd, "h")) {
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SET_EXPR(hue_deg, "h");
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av_freep(&hue->hue_expr);
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} else if (!strcmp(cmd, "H")) {
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SET_EXPR(hue, "H");
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av_freep(&hue->hue_deg_expr);
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} else if (!strcmp(cmd, "s")) {
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SET_EXPR(saturation, "s");
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} else if (!strcmp(cmd, "b")) {
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SET_EXPR(brightness, "b");
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} else
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return AVERROR(ENOSYS);
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return 0;
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}
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static const AVFilterPad hue_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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.config_props = config_props,
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},
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{ NULL }
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};
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static const AVFilterPad hue_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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AVFilter ff_vf_hue = {
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.name = "hue",
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.description = NULL_IF_CONFIG_SMALL("Adjust the hue and saturation of the input video."),
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.priv_size = sizeof(HueContext),
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.init = init,
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.uninit = uninit,
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.query_formats = query_formats,
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.process_command = process_command,
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.inputs = hue_inputs,
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.outputs = hue_outputs,
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.priv_class = &hue_class,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
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};
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