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Diffstat (limited to 'libavfilter/vf_hue.c')
| -rw-r--r-- | libavfilter/vf_hue.c | 429 |
1 files changed, 429 insertions, 0 deletions
diff --git a/libavfilter/vf_hue.c b/libavfilter/vf_hue.c new file mode 100644 index 0000000000..71d5cc88ad --- /dev/null +++ b/libavfilter/vf_hue.c @@ -0,0 +1,429 @@ +/* + * 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/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 HUE_DEFAULT_VAL 0 +#define SAT_DEFAULT_VAL 1 + +#define HUE_DEFAULT_VAL_STRING AV_STRINGIFY(HUE_DEFAULT_VAL) +#define SAT_DEFAULT_VAL_STRING AV_STRINGIFY(SAT_DEFAULT_VAL) + +#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; + int hsub; + int vsub; + int32_t hue_sin; + int32_t hue_cos; + int flat_syntax; + double var_values[VAR_NB]; +} 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 }, + { "H", "set the hue angle radians expression", OFFSET(hue_expr), AV_OPT_TYPE_STRING, + { .str = NULL }, .flags = FLAGS }, + { "s", "set the saturation expression", OFFSET(saturation_expr), AV_OPT_TYPE_STRING, + { .str = NULL }, .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 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); +} + +#define SET_EXPRESSION(attr, name) do { \ + if (hue->attr##_expr) { \ + if ((ret = av_expr_parse(&hue->attr##_pexpr, hue->attr##_expr, var_names, \ + NULL, NULL, NULL, NULL, 0, ctx)) < 0) { \ + av_log(ctx, AV_LOG_ERROR, \ + "Parsing failed for expression " #name "='%s'", \ + hue->attr##_expr); \ + hue->attr##_expr = old_##attr##_expr; \ + hue->attr##_pexpr = old_##attr##_pexpr; \ + return AVERROR(EINVAL); \ + } else if (old_##attr##_pexpr) { \ + av_freep(&old_##attr##_expr); \ + av_expr_free(old_##attr##_pexpr); \ + old_##attr##_pexpr = NULL; \ + } \ + } else { \ + hue->attr##_expr = old_##attr##_expr; \ + } \ +} while (0) + +static inline int set_options(AVFilterContext *ctx, const char *args) +{ + HueContext *hue = ctx->priv; + int n, ret; + char c1 = 0, c2 = 0; + char *old_hue_expr, *old_hue_deg_expr, *old_saturation_expr; + AVExpr *old_hue_pexpr, *old_hue_deg_pexpr, *old_saturation_pexpr; + + if (args) { + /* named options syntax */ + if (strchr(args, '=')) { + old_hue_expr = hue->hue_expr; + old_hue_deg_expr = hue->hue_deg_expr; + old_saturation_expr = hue->saturation_expr; + + old_hue_pexpr = hue->hue_pexpr; + old_hue_deg_pexpr = hue->hue_deg_pexpr; + old_saturation_pexpr = hue->saturation_pexpr; + + hue->hue_expr = NULL; + hue->hue_deg_expr = NULL; + hue->saturation_expr = NULL; + + if ((ret = av_set_options_string(hue, args, "=", ":")) < 0) + return 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"); + hue->hue_expr = old_hue_expr; + hue->hue_deg_expr = old_hue_deg_expr; + + return AVERROR(EINVAL); + } + + SET_EXPRESSION(hue_deg, h); + SET_EXPRESSION(hue, H); + SET_EXPRESSION(saturation, s); + + hue->flat_syntax = 0; + + av_log(ctx, AV_LOG_VERBOSE, + "H_expr:%s h_deg_expr:%s s_expr:%s\n", + hue->hue_expr, hue->hue_deg_expr, hue->saturation_expr); + + /* 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 < SAT_MIN_VAL || hue->saturation > SAT_MAX_VAL) { + av_log(ctx, AV_LOG_ERROR, + "Invalid value for saturation %0.1f: " + "must be included between range %d and +%d\n", + hue->saturation, SAT_MIN_VAL, SAT_MAX_VAL); + return AVERROR(EINVAL); + } + + hue->hue = hue->hue_deg * M_PI / 180; + hue->flat_syntax = 1; + + av_log(ctx, AV_LOG_VERBOSE, + "H:%0.1f h:%0.1f s:%0.1f\n", + hue->hue, hue->hue_deg, hue->saturation); + } + } + + compute_sin_and_cos(hue); + + return 0; +} + +static av_cold int init(AVFilterContext *ctx, const char *args) +{ + HueContext *hue = ctx->priv; + + hue->class = &hue_class; + av_opt_set_defaults(hue); + + hue->saturation = SAT_DEFAULT_VAL; + hue->hue = HUE_DEFAULT_VAL; + hue->hue_deg_pexpr = NULL; + hue->hue_pexpr = NULL; + hue->flat_syntax = 1; + + return set_options(ctx, args); +} + +static av_cold void uninit(AVFilterContext *ctx) +{ + HueContext *hue = ctx->priv; + + av_opt_free(hue); + + av_free(hue->hue_deg_expr); + av_expr_free(hue->hue_deg_pexpr); + av_free(hue->hue_expr); + av_expr_free(hue->hue_pexpr); + av_free(hue->saturation_expr); + 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_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_descriptors[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 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; + } +} + +#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 start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpic) +{ + HueContext *hue = inlink->dst->priv; + AVFilterLink *outlink = inlink->dst->outputs[0]; + AVFilterBufferRef *buf_out; + + outlink->out_buf = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h); + if (!outlink->out_buf) + return AVERROR(ENOMEM); + + avfilter_copy_buffer_ref_props(outlink->out_buf, inpic); + outlink->out_buf->video->w = outlink->w; + outlink->out_buf->video->h = outlink->h; + buf_out = avfilter_ref_buffer(outlink->out_buf, ~0); + if (!buf_out) + return AVERROR(ENOMEM); + + if (!hue->flat_syntax) { + 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->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); + } + + av_log(inlink->dst, AV_LOG_DEBUG, + "H:%0.1f s:%0.f t:%0.1f n:%d\n", + hue->hue, hue->saturation, + hue->var_values[VAR_T], (int)hue->var_values[VAR_N]); + + compute_sin_and_cos(hue); + } + + hue->var_values[VAR_N] += 1; + + return ff_start_frame(outlink, buf_out); +} + +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) +{ + if (!strcmp(cmd, "reinit")) + return set_options(ctx, args); + else + return AVERROR(ENOSYS); +} + +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, + .start_frame = start_frame, + .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, +}; |