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This is a port of the MPlayer hue filter (libmpcodecs/vf_hue.c) by Michael Niedermayer. Signed-off-by: Jérémy Tran <tran.jeremy.av@gmail.com> Signed-off-by: Stefano Sabatini <stefasab@gmail.com>
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@@ -44,6 +44,7 @@ version next: | |
- bmp parser | ||
- smptebars source | ||
- asetpts filter | ||
- hue filter | ||
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version 0.11: | ||
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/* | ||
* 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. | ||
*/ | ||
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/** | ||
* @file | ||
* Apply a hue/saturation filter to the input video | ||
* Ported from MPlayer libmpcodecs/vf_hue.c. | ||
*/ | ||
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#include "libavutil/imgutils.h" | ||
#include "libavutil/pixdesc.h" | ||
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#include "avfilter.h" | ||
#include "formats.h" | ||
#include "internal.h" | ||
#include "video.h" | ||
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typedef struct { | ||
float hue; | ||
float saturation; | ||
int hsub; | ||
int vsub; | ||
int32_t hue_sin; | ||
int32_t hue_cos; | ||
} HueContext; | ||
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static av_cold int init(AVFilterContext *ctx, const char *args) | ||
{ | ||
HueContext *hue = ctx->priv; | ||
float h = 0, s = 1; | ||
int n; | ||
char c1 = 0, c2 = 0; | ||
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if (args) { | ||
n = sscanf(args, "%f%c%f%c", &h, &c1, &s, &c2); | ||
if (n != 0 && 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); | ||
} | ||
} | ||
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if (s < -10 || s > 10) { | ||
av_log(ctx, AV_LOG_ERROR, | ||
"Invalid value for saturation %0.1f: " | ||
"must be included between range -10 and +10\n", s); | ||
return AVERROR(EINVAL); | ||
} | ||
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/* Convert angle from degree to radian */ | ||
hue->hue = h * M_PI / 180; | ||
hue->saturation = s; | ||
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return 0; | ||
} | ||
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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 | ||
}; | ||
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); | ||
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return 0; | ||
} | ||
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static int config_props(AVFilterLink *inlink) | ||
{ | ||
HueContext *hue = inlink->dst->priv; | ||
const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[inlink->format]; | ||
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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); | ||
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return 0; | ||
} | ||
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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; | ||
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/* | ||
* 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; | ||
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/* Prevent a potential overflow */ | ||
udst[i] = av_clip_uint8_c(new_u); | ||
vdst[i] = av_clip_uint8_c(new_v); | ||
} | ||
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usrc += src_linesize; | ||
vsrc += src_linesize; | ||
udst += dst_linesize; | ||
vdst += dst_linesize; | ||
} | ||
} | ||
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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; | ||
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inrow[0] = inpic->data[0] + y * inpic->linesize[0]; | ||
outrow[0] = outpic->data[0] + y * outpic->linesize[0]; | ||
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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]; | ||
} | ||
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av_image_copy_plane(outrow[0], outpic->linesize[0], | ||
inrow[0], inpic->linesize[0], | ||
inlink->w, inlink->h); | ||
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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); | ||
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return ff_draw_slice(inlink->dst->outputs[0], y, h, slice_dir); | ||
} | ||
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AVFilter avfilter_vf_hue = { | ||
.name = "hue", | ||
.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, | ||
.query_formats = query_formats, | ||
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.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 } | ||
} | ||
}; |