diff options
Diffstat (limited to 'libavfilter/vf_hue.c')
| -rw-r--r-- | libavfilter/vf_hue.c | 453 |
1 files changed, 453 insertions, 0 deletions
diff --git a/libavfilter/vf_hue.c b/libavfilter/vf_hue.c new file mode 100644 index 0000000..7843673 --- /dev/null +++ b/libavfilter/vf_hue.c @@ -0,0 +1,453 @@ +/* + * Copyright (c) 2003 Michael Niedermayer + * Copyright (c) 2012 Jeremy Tran + * + * 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 + */ + +/** + * @file + * Apply a hue/saturation filter to the input video + * Ported from MPlayer libmpcodecs/vf_hue.c. + */ + +#include <float.h> +#include "libavutil/eval.h" +#include "libavutil/imgutils.h" +#include "libavutil/opt.h" +#include "libavutil/pixdesc.h" + +#include "avfilter.h" +#include "formats.h" +#include "internal.h" +#include "video.h" + +#define SAT_MIN_VAL -10 +#define SAT_MAX_VAL 10 + +static const char *const var_names[] = { + "n", // frame count + "pts", // presentation timestamp expressed in AV_TIME_BASE units + "r", // frame rate + "t", // timestamp expressed in seconds + "tb", // timebase + NULL +}; + +enum var_name { + VAR_N, + VAR_PTS, + VAR_R, + VAR_T, + VAR_TB, + VAR_NB +}; + +typedef struct { + const AVClass *class; + float hue_deg; /* hue expressed in degrees */ + float hue; /* hue expressed in radians */ + char *hue_deg_expr; + char *hue_expr; + AVExpr *hue_deg_pexpr; + AVExpr *hue_pexpr; + float saturation; + char *saturation_expr; + AVExpr *saturation_pexpr; + float brightness; + char *brightness_expr; + AVExpr *brightness_pexpr; + int hsub; + int vsub; + int is_first; + int32_t hue_sin; + int32_t hue_cos; + double var_values[VAR_NB]; + uint8_t lut_l[256]; + uint8_t lut_u[256][256]; + uint8_t lut_v[256][256]; +} HueContext; + +#define OFFSET(x) offsetof(HueContext, x) +#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM +static const AVOption hue_options[] = { + { "h", "set the hue angle degrees expression", OFFSET(hue_deg_expr), AV_OPT_TYPE_STRING, + { .str = NULL }, .flags = FLAGS }, + { "s", "set the saturation expression", OFFSET(saturation_expr), AV_OPT_TYPE_STRING, + { .str = "1" }, .flags = FLAGS }, + { "H", "set the hue angle radians expression", OFFSET(hue_expr), AV_OPT_TYPE_STRING, + { .str = NULL }, .flags = FLAGS }, + { "b", "set the brightness expression", OFFSET(brightness_expr), AV_OPT_TYPE_STRING, + { .str = "0" }, .flags = FLAGS }, + { NULL } +}; + +AVFILTER_DEFINE_CLASS(hue); + +static inline void compute_sin_and_cos(HueContext *hue) +{ + /* + * Scale the value to the norm of the resulting (U,V) vector, that is + * the saturation. + * This will be useful in the apply_lut function. + */ + hue->hue_sin = rint(sin(hue->hue) * (1 << 16) * hue->saturation); + hue->hue_cos = rint(cos(hue->hue) * (1 << 16) * hue->saturation); +} + +static inline void create_luma_lut(HueContext *h) +{ + const float b = h->brightness; + int i; + + for (i = 0; i < 256; i++) { + h->lut_l[i] = av_clip_uint8(i + b * 25.5); + } +} + +static inline void create_chrominance_lut(HueContext *h, const int32_t c, + const int32_t s) +{ + int32_t i, j, u, v, new_u, new_v; + + /* + * If we consider U and V as the components of a 2D vector then its angle + * is the hue and the norm is the saturation + */ + for (i = 0; i < 256; i++) { + for (j = 0; j < 256; j++) { + /* Normalize the components from range [16;140] to [-112;112] */ + u = i - 128; + v = j - 128; + /* + * Apply the rotation of the vector : (c * u) - (s * v) + * (s * u) + (c * v) + * De-normalize the components (without forgetting to scale 128 + * by << 16) + * Finally scale back the result by >> 16 + */ + new_u = ((c * u) - (s * v) + (1 << 15) + (128 << 16)) >> 16; + new_v = ((s * u) + (c * v) + (1 << 15) + (128 << 16)) >> 16; + + /* Prevent a potential overflow */ + h->lut_u[i][j] = av_clip_uint8(new_u); + h->lut_v[i][j] = av_clip_uint8(new_v); + } + } +} + +static int set_expr(AVExpr **pexpr_ptr, char **expr_ptr, + const char *expr, const char *option, void *log_ctx) +{ + int ret; + AVExpr *new_pexpr; + char *new_expr; + + new_expr = av_strdup(expr); + if (!new_expr) + return AVERROR(ENOMEM); + ret = av_expr_parse(&new_pexpr, expr, var_names, + NULL, NULL, NULL, NULL, 0, log_ctx); + if (ret < 0) { + av_log(log_ctx, AV_LOG_ERROR, + "Error when evaluating the expression '%s' for %s\n", + expr, option); + av_free(new_expr); + return ret; + } + + if (*pexpr_ptr) + av_expr_free(*pexpr_ptr); + *pexpr_ptr = new_pexpr; + av_freep(expr_ptr); + *expr_ptr = new_expr; + + return 0; +} + +static av_cold int init(AVFilterContext *ctx) +{ + HueContext *hue = ctx->priv; + int ret; + + if (hue->hue_expr && hue->hue_deg_expr) { + av_log(ctx, AV_LOG_ERROR, + "H and h options are incompatible and cannot be specified " + "at the same time\n"); + return AVERROR(EINVAL); + } + +#define SET_EXPR(expr, option) \ + if (hue->expr##_expr) do { \ + ret = set_expr(&hue->expr##_pexpr, &hue->expr##_expr, \ + hue->expr##_expr, option, ctx); \ + if (ret < 0) \ + return ret; \ + } while (0) + SET_EXPR(brightness, "b"); + SET_EXPR(saturation, "s"); + SET_EXPR(hue_deg, "h"); + SET_EXPR(hue, "H"); +#undef SET_EXPR + + av_log(ctx, AV_LOG_VERBOSE, + "H_expr:%s h_deg_expr:%s s_expr:%s b_expr:%s\n", + hue->hue_expr, hue->hue_deg_expr, hue->saturation_expr, hue->brightness_expr); + compute_sin_and_cos(hue); + hue->is_first = 1; + + return 0; +} + +static av_cold void uninit(AVFilterContext *ctx) +{ + HueContext *hue = ctx->priv; + + av_expr_free(hue->brightness_pexpr); + av_expr_free(hue->hue_deg_pexpr); + av_expr_free(hue->hue_pexpr); + av_expr_free(hue->saturation_pexpr); +} + +static int query_formats(AVFilterContext *ctx) +{ + static const enum AVPixelFormat pix_fmts[] = { + AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, + AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, + AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P, + AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, + AV_PIX_FMT_YUVA420P, + AV_PIX_FMT_NONE + }; + + ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); + + return 0; +} + +static int config_props(AVFilterLink *inlink) +{ + HueContext *hue = inlink->dst->priv; + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); + + hue->hsub = desc->log2_chroma_w; + hue->vsub = desc->log2_chroma_h; + + hue->var_values[VAR_N] = 0; + hue->var_values[VAR_TB] = av_q2d(inlink->time_base); + hue->var_values[VAR_R] = inlink->frame_rate.num == 0 || inlink->frame_rate.den == 0 ? + NAN : av_q2d(inlink->frame_rate); + + return 0; +} + +static void apply_luma_lut(HueContext *s, + uint8_t *ldst, const int dst_linesize, + uint8_t *lsrc, const int src_linesize, + int w, int h) +{ + int i; + + while (h--) { + for (i = 0; i < w; i++) + ldst[i] = s->lut_l[lsrc[i]]; + + lsrc += src_linesize; + ldst += dst_linesize; + } +} + +static void apply_lut(HueContext *s, + uint8_t *udst, uint8_t *vdst, const int dst_linesize, + uint8_t *usrc, uint8_t *vsrc, const int src_linesize, + int w, int h) +{ + int i; + + while (h--) { + for (i = 0; i < w; i++) { + const int u = usrc[i]; + const int v = vsrc[i]; + + udst[i] = s->lut_u[u][v]; + vdst[i] = s->lut_v[u][v]; + } + + usrc += src_linesize; + vsrc += src_linesize; + udst += dst_linesize; + vdst += dst_linesize; + } +} + +#define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts)) +#define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts) * av_q2d(tb)) + +static int filter_frame(AVFilterLink *inlink, AVFrame *inpic) +{ + HueContext *hue = inlink->dst->priv; + AVFilterLink *outlink = inlink->dst->outputs[0]; + AVFrame *outpic; + const int32_t old_hue_sin = hue->hue_sin, old_hue_cos = hue->hue_cos; + const float old_brightness = hue->brightness; + int direct = 0; + + if (av_frame_is_writable(inpic)) { + direct = 1; + outpic = inpic; + } else { + outpic = ff_get_video_buffer(outlink, outlink->w, outlink->h); + if (!outpic) { + av_frame_free(&inpic); + return AVERROR(ENOMEM); + } + av_frame_copy_props(outpic, inpic); + } + + hue->var_values[VAR_N] = inlink->frame_count; + hue->var_values[VAR_T] = TS2T(inpic->pts, inlink->time_base); + hue->var_values[VAR_PTS] = TS2D(inpic->pts); + + if (hue->saturation_expr) { + hue->saturation = av_expr_eval(hue->saturation_pexpr, hue->var_values, NULL); + + if (hue->saturation < SAT_MIN_VAL || hue->saturation > SAT_MAX_VAL) { + hue->saturation = av_clip(hue->saturation, SAT_MIN_VAL, SAT_MAX_VAL); + av_log(inlink->dst, AV_LOG_WARNING, + "Saturation value not in range [%d,%d]: clipping value to %0.1f\n", + SAT_MIN_VAL, SAT_MAX_VAL, hue->saturation); + } + } + + if (hue->brightness_expr) { + hue->brightness = av_expr_eval(hue->brightness_pexpr, hue->var_values, NULL); + + if (hue->brightness < -10 || hue->brightness > 10) { + hue->brightness = av_clipf(hue->brightness, -10, 10); + av_log(inlink->dst, AV_LOG_WARNING, + "Brightness value not in range [%d,%d]: clipping value to %0.1f\n", + -10, 10, hue->brightness); + } + } + + if (hue->hue_deg_expr) { + hue->hue_deg = av_expr_eval(hue->hue_deg_pexpr, hue->var_values, NULL); + hue->hue = hue->hue_deg * M_PI / 180; + } else if (hue->hue_expr) { + hue->hue = av_expr_eval(hue->hue_pexpr, hue->var_values, NULL); + hue->hue_deg = hue->hue * 180 / M_PI; + } + + av_log(inlink->dst, AV_LOG_DEBUG, + "H:%0.1f*PI h:%0.1f s:%0.1f b:%0.f t:%0.1f n:%d\n", + hue->hue/M_PI, hue->hue_deg, hue->saturation, hue->brightness, + hue->var_values[VAR_T], (int)hue->var_values[VAR_N]); + + compute_sin_and_cos(hue); + if (hue->is_first || (old_hue_sin != hue->hue_sin || old_hue_cos != hue->hue_cos)) + create_chrominance_lut(hue, hue->hue_cos, hue->hue_sin); + + if (hue->is_first || (old_brightness != hue->brightness && hue->brightness)) + create_luma_lut(hue); + + if (!direct) { + if (!hue->brightness) + av_image_copy_plane(outpic->data[0], outpic->linesize[0], + inpic->data[0], inpic->linesize[0], + inlink->w, inlink->h); + if (inpic->data[3]) + av_image_copy_plane(outpic->data[3], outpic->linesize[3], + inpic->data[3], inpic->linesize[3], + inlink->w, inlink->h); + } + + apply_lut(hue, outpic->data[1], outpic->data[2], outpic->linesize[1], + inpic->data[1], inpic->data[2], inpic->linesize[1], + FF_CEIL_RSHIFT(inlink->w, hue->hsub), + FF_CEIL_RSHIFT(inlink->h, hue->vsub)); + if (hue->brightness) + apply_luma_lut(hue, outpic->data[0], outpic->linesize[0], + inpic->data[0], inpic->linesize[0], inlink->w, inlink->h); + + if (!direct) + av_frame_free(&inpic); + + hue->is_first = 0; + return ff_filter_frame(outlink, outpic); +} + +static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, + char *res, int res_len, int flags) +{ + HueContext *hue = ctx->priv; + int ret; + +#define SET_EXPR(expr, option) \ + do { \ + ret = set_expr(&hue->expr##_pexpr, &hue->expr##_expr, \ + args, option, ctx); \ + if (ret < 0) \ + return ret; \ + } while (0) + + if (!strcmp(cmd, "h")) { + SET_EXPR(hue_deg, "h"); + av_freep(&hue->hue_expr); + } else if (!strcmp(cmd, "H")) { + SET_EXPR(hue, "H"); + av_freep(&hue->hue_deg_expr); + } else if (!strcmp(cmd, "s")) { + SET_EXPR(saturation, "s"); + } else if (!strcmp(cmd, "b")) { + SET_EXPR(brightness, "b"); + } else + return AVERROR(ENOSYS); + + return 0; +} + +static const AVFilterPad hue_inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .filter_frame = filter_frame, + .config_props = config_props, + }, + { NULL } +}; + +static const AVFilterPad hue_outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + }, + { NULL } +}; + +AVFilter ff_vf_hue = { + .name = "hue", + .description = NULL_IF_CONFIG_SMALL("Adjust the hue and saturation of the input video."), + .priv_size = sizeof(HueContext), + .init = init, + .uninit = uninit, + .query_formats = query_formats, + .process_command = process_command, + .inputs = hue_inputs, + .outputs = hue_outputs, + .priv_class = &hue_class, + .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, +}; |
