diff options
Diffstat (limited to 'libavfilter/vf_hue.c')
-rw-r--r-- | libavfilter/vf_hue.c | 291 |
1 files changed, 291 insertions, 0 deletions
diff --git a/libavfilter/vf_hue.c b/libavfilter/vf_hue.c new file mode 100644 index 0000000..dd36d8e --- /dev/null +++ b/libavfilter/vf_hue.c @@ -0,0 +1,291 @@ +/* + * 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 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 + * Apply a hue/saturation filter to the input video + * Ported from MPlayer libmpcodecs/vf_hue.c. + */ + +#include <float.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 HUE_DEFAULT_VAL 0 +#define SAT_DEFAULT_VAL 1 + +typedef struct { + const AVClass *class; + float hue_deg; /* hue expressed in degrees */ + float hue; /* hue expressed in radians */ + float saturation; + int hsub; + int vsub; + int32_t hue_sin; + int32_t hue_cos; +} 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", OFFSET(hue_deg), AV_OPT_TYPE_FLOAT, + { -FLT_MAX }, -FLT_MAX, FLT_MAX, FLAGS }, + { "H", "set the hue angle radians", OFFSET(hue), AV_OPT_TYPE_FLOAT, + { -FLT_MAX }, -FLT_MAX, FLT_MAX, FLAGS }, + { "s", "set the saturation value", OFFSET(saturation), AV_OPT_TYPE_FLOAT, + { SAT_DEFAULT_VAL }, -10, 10, FLAGS }, + { NULL } +}; + +AVFILTER_DEFINE_CLASS(hue); + +static inline int set_options(AVFilterContext *ctx, const char *args) +{ + HueContext *hue = ctx->priv; + int n, ret; + char c1 = 0, c2 = 0; + char *equal; + + if (args) { + /* named options syntax */ + if (equal = strchr(args, '=')) { + hue->hue = -FLT_MAX; + hue->hue_deg = -FLT_MAX; + + if ((ret = av_set_options_string(hue, args, "=", ":")) < 0) + return ret; + if (hue->hue != -FLT_MAX && hue->hue_deg != -FLT_MAX) { + av_log(ctx, AV_LOG_ERROR, + "H and h options are incompatible and cannot be specified " + "at the same time\n"); + return AVERROR(EINVAL); + } + /* compatibility h:s syntax */ + } else { + n = sscanf(args, "%f%c%f%c", &hue->hue_deg, &c1, &hue->saturation, &c2); + if (n != 1 && (n != 3 || c1 != ':')) { + av_log(ctx, AV_LOG_ERROR, + "Invalid syntax for argument '%s': " + "must be in the form 'hue[:saturation]'\n", args); + return AVERROR(EINVAL); + } + + if (hue->saturation < -10 || hue->saturation > 10) { + av_log(ctx, AV_LOG_ERROR, + "Invalid value for saturation %0.1f: " + "must be included between range -10 and +10\n", hue->saturation); + return AVERROR(EINVAL); + } + } + } + + return 0; +} + +static av_cold int init(AVFilterContext *ctx, const char *args) +{ + HueContext *hue = ctx->priv; + int ret; + + hue->class = &hue_class; + av_opt_set_defaults(hue); + + if ((ret = set_options(ctx, args)) < 0) + return ret; + + if (hue->saturation == -FLT_MAX) + hue->hue = SAT_DEFAULT_VAL; + if (hue->hue == -FLT_MAX) + hue->hue = HUE_DEFAULT_VAL; + if (hue->hue_deg != -FLT_MAX) + /* Convert angle from degrees to radians */ + hue->hue = hue->hue_deg * M_PI / 180; + + av_log(ctx, AV_LOG_VERBOSE, "hue:%f*PI hue_deg:%f saturation:%f\n", + hue->hue/M_PI, hue->hue*180/M_PI, hue->saturation); + return 0; +} + +static av_cold void uninit(AVFilterContext *ctx) +{ + HueContext *hue = ctx->priv; + + av_opt_free(hue); +} + +static int query_formats(AVFilterContext *ctx) +{ + static const enum PixelFormat pix_fmts[] = { + PIX_FMT_YUV444P, PIX_FMT_YUV422P, + PIX_FMT_YUV420P, PIX_FMT_YUV411P, + PIX_FMT_YUV410P, PIX_FMT_YUV440P, + PIX_FMT_YUVA420P, + 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_descriptors[inlink->format]; + + hue->hsub = desc->log2_chroma_w; + hue->vsub = desc->log2_chroma_h; + /* + * Scale the value to the norm of the resulting (U,V) vector, that is + * the saturation. + * This will be useful in the process_chrominance function. + */ + hue->hue_sin = rint(sin(hue->hue) * (1 << 16) * hue->saturation); + hue->hue_cos = rint(cos(hue->hue) * (1 << 16) * hue->saturation); + + return 0; +} + +static void process_chrominance(uint8_t *udst, uint8_t *vdst, const int dst_linesize, + uint8_t *usrc, uint8_t *vsrc, const int src_linesize, + int w, int h, + const int32_t c, const int32_t s) +{ + int32_t u, v, new_u, new_v; + int i; + + /* + * 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 + */ + while (h--) { + for (i = 0; i < w; i++) { + /* Normalize the components from range [16;140] to [-112;112] */ + u = usrc[i] - 128; + v = vsrc[i] - 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 */ + udst[i] = av_clip_uint8_c(new_u); + vdst[i] = av_clip_uint8_c(new_v); + } + + usrc += src_linesize; + vsrc += src_linesize; + udst += dst_linesize; + vdst += dst_linesize; + } +} + +static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) +{ + HueContext *hue = inlink->dst->priv; + AVFilterBufferRef *inpic = inlink->cur_buf; + AVFilterBufferRef *outpic = inlink->dst->outputs[0]->out_buf; + uint8_t *inrow[3], *outrow[3]; // 0 : Y, 1 : U, 2 : V + int plane; + + inrow[0] = inpic->data[0] + y * inpic->linesize[0]; + outrow[0] = outpic->data[0] + y * outpic->linesize[0]; + + for (plane = 1; plane < 3; plane++) { + inrow[plane] = inpic->data[plane] + (y >> hue->vsub) * inpic->linesize[plane]; + outrow[plane] = outpic->data[plane] + (y >> hue->vsub) * outpic->linesize[plane]; + } + + av_image_copy_plane(outrow[0], outpic->linesize[0], + inrow[0], inpic->linesize[0], + inlink->w, inlink->h); + + process_chrominance(outrow[1], outrow[2], outpic->linesize[1], + inrow[1], inrow[2], inpic->linesize[1], + inlink->w >> hue->hsub, inlink->h >> hue->vsub, + hue->hue_cos, hue->hue_sin); + + return ff_draw_slice(inlink->dst->outputs[0], y, h, slice_dir); +} + +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; + + if (!strcmp(cmd, "reinit")) { + if ((ret = set_options(ctx, args)) < 0) + return ret; + + if (hue->hue_deg != -FLT_MAX) + /* Convert angle from degrees to radians */ + hue->hue = hue->hue_deg * M_PI / 180; + + hue->hue_sin = rint(sin(hue->hue) * (1 << 16) * hue->saturation); + hue->hue_cos = rint(cos(hue->hue) * (1 << 16) * hue->saturation); + } else + return AVERROR(ENOSYS); + + return 0; +} + +AVFilter avfilter_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 = (const AVFilterPad[]) { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .draw_slice = draw_slice, + .config_props = config_props, + .min_perms = AV_PERM_READ, + }, + { .name = NULL } + }, + .outputs = (const AVFilterPad[]) { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + }, + { .name = NULL } + }, + .priv_class = &hue_class, +}; |