colorchannelmixer filter
authorPaul B Mahol <onemda@gmail.com>
Mon, 15 Apr 2013 16:56:29 +0000 (16:56 +0000)
committerPaul B Mahol <onemda@gmail.com>
Thu, 18 Apr 2013 15:31:35 +0000 (15:31 +0000)
Signed-off-by: Paul B Mahol <onemda@gmail.com>
Changelog
doc/filters.texi
libavfilter/Makefile
libavfilter/allfilters.c
libavfilter/version.h
libavfilter/vf_colorchannelmixer.c [new file with mode: 0644]

index eceed90..9ebbc9b 100644 (file)
--- a/Changelog
+++ b/Changelog
@@ -24,6 +24,7 @@ version <next>:
 - smptehdbars source
 - inverse telecine filters (fieldmatch and decimate)
 - colorbalance filter
+- colorchannelmixer filter
 
 
 version 1.2:
index 56c722d..43d7368 100644 (file)
@@ -2091,6 +2091,61 @@ colorbalance=rs=.3
 @end example
 @end itemize
 
+@section colorchannelmixer
+
+Adjust video input frames by re-mixing color channels.
+
+This filter modifies a color channel by adding the values associated to
+the other channels of the same pixels. For example if the value to
+modify is red, the output value will be:
+@example
+@var{red}=@var{red}*@var{rr} + @var{blue}*@var{rb} + @var{green}*@var{rg} + @var{alpha}*@var{ra}
+@end example
+
+The filter accepts the following options:
+
+@table @option
+@item rr
+@item rg
+@item rb
+@item ra
+Adjust contribution of input red, green, blue and alpha channels for output red channel.
+Default is @code{1} for @var{rr}, and @code{0} for @var{rg}, @var{rb} and @var{ra}.
+
+@item gr
+@item gg
+@item gb
+@item ga
+Adjust contribution of input red, green, blue and alpha channels for output green channel.
+Default is @code{1} for @var{gg}, and @code{0} for @var{gr}, @var{gb} and @var{ga}.
+
+@item br
+@item bg
+@item bb
+@item ba
+Adjust contribution of input red, green, blue and alpha channels for output blue channel.
+Default is @code{1} for @var{bb}, and @code{0} for @var{br}, @var{bg} and @var{ba}.
+
+@item ar
+@item ag
+@item ab
+@item aa
+Adjust contribution of input red, green, blue and alpha channels for output alpha channel.
+Default is @code{1} for @var{aa}, and @code{0} for @var{ar}, @var{ag} and @var{ab}.
+
+Allowed ranges for options are @code{[-2.0, 2.0]}.
+@end table
+
+@subsection Examples
+
+@itemize
+@item
+Convert source to grayscale:
+@example
+colorchannelmixer=.3:.4:.3:0:.3:.4:.3:0:.3:.4:.3
+@end example
+@end itemize
+
 @section colormatrix
 
 Convert color matrix.
index 3d42626..33b3f5b 100644 (file)
@@ -105,6 +105,7 @@ OBJS-$(CONFIG_BLACKFRAME_FILTER)             += vf_blackframe.o
 OBJS-$(CONFIG_BLEND_FILTER)                  += vf_blend.o
 OBJS-$(CONFIG_BOXBLUR_FILTER)                += vf_boxblur.o
 OBJS-$(CONFIG_COLORBALANCE_FILTER)           += vf_colorbalance.o
+OBJS-$(CONFIG_COLORCHANNELMIXER_FILTER)      += vf_colorchannelmixer.o
 OBJS-$(CONFIG_COLORMATRIX_FILTER)            += vf_colormatrix.o
 OBJS-$(CONFIG_COPY_FILTER)                   += vf_copy.o
 OBJS-$(CONFIG_CROP_FILTER)                   += vf_crop.o
index bebbf2b..a6c8597 100644 (file)
@@ -103,6 +103,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(BLEND,          blend,          vf);
     REGISTER_FILTER(BOXBLUR,        boxblur,        vf);
     REGISTER_FILTER(COLORBALANCE,   colorbalance,   vf);
+    REGISTER_FILTER(COLORCHANNELMIXER, colorchannelmixer, vf);
     REGISTER_FILTER(COLORMATRIX,    colormatrix,    vf);
     REGISTER_FILTER(COPY,           copy,           vf);
     REGISTER_FILTER(CROP,           crop,           vf);
index c751674..b0bd3bb 100644 (file)
@@ -29,7 +29,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  3
-#define LIBAVFILTER_VERSION_MINOR  57
+#define LIBAVFILTER_VERSION_MINOR  58
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
diff --git a/libavfilter/vf_colorchannelmixer.c b/libavfilter/vf_colorchannelmixer.c
new file mode 100644 (file)
index 0000000..963d415
--- /dev/null
@@ -0,0 +1,370 @@
+/*
+ * Copyright (c) 2013 Paul B Mahol
+ *
+ * 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
+ */
+
+#include "libavutil/opt.h"
+#include "avfilter.h"
+#include "drawutils.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+#define R 0
+#define G 1
+#define B 2
+#define A 3
+
+typedef struct {
+    const AVClass *class;
+    double rr, rg, rb, ra;
+    double gr, gg, gb, ga;
+    double br, bg, bb, ba;
+    double ar, ag, ab, aa;
+
+    int *lut[4][4];
+
+    int *buffer;
+
+    uint8_t rgba_map[4];
+} ColorChannelMixerContext;
+
+#define OFFSET(x) offsetof(ColorChannelMixerContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+static const AVOption colorchannelmixer_options[] = {
+    { "rr", "set the red gain for the red channel",     OFFSET(rr), AV_OPT_TYPE_DOUBLE, {.dbl=1}, -2, 2, FLAGS },
+    { "rg", "set the green gain for the red channel",   OFFSET(rg), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -2, 2, FLAGS },
+    { "rb", "set the blue gain for the red channel",    OFFSET(rb), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -2, 2, FLAGS },
+    { "ra", "set the alpha gain for the red channel",   OFFSET(ra), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -2, 2, FLAGS },
+    { "gr", "set the red gain for the green channel",   OFFSET(gr), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -2, 2, FLAGS },
+    { "gg", "set the green gain for the green channel", OFFSET(gg), AV_OPT_TYPE_DOUBLE, {.dbl=1}, -2, 2, FLAGS },
+    { "gb", "set the blue gain for the green channel",  OFFSET(gb), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -2, 2, FLAGS },
+    { "ga", "set the alpha gain for the green channel", OFFSET(ga), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -2, 2, FLAGS },
+    { "br", "set the red gain for the blue channel",    OFFSET(br), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -2, 2, FLAGS },
+    { "bg", "set the green gain for the blue channel",  OFFSET(bg), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -2, 2, FLAGS },
+    { "bb", "set the blue gain for the blue channel",   OFFSET(bb), AV_OPT_TYPE_DOUBLE, {.dbl=1}, -2, 2, FLAGS },
+    { "ba", "set the alpha gain for the blue channel",  OFFSET(ba), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -2, 2, FLAGS },
+    { "ar", "set the red gain for the alpha channel",   OFFSET(ar), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -2, 2, FLAGS },
+    { "ag", "set the green gain for the alpha channel", OFFSET(ag), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -2, 2, FLAGS },
+    { "ab", "set the blue gain for the alpha channel",  OFFSET(ab), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -2, 2, FLAGS },
+    { "aa", "set the alpha gain for the alpha channel", OFFSET(aa), AV_OPT_TYPE_DOUBLE, {.dbl=1}, -2, 2, FLAGS },
+    { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(colorchannelmixer);
+
+static int query_formats(AVFilterContext *ctx)
+{
+    static const enum AVPixelFormat pix_fmts[] = {
+        AV_PIX_FMT_RGB24,  AV_PIX_FMT_BGR24,
+        AV_PIX_FMT_RGBA,   AV_PIX_FMT_BGRA,
+        AV_PIX_FMT_ARGB,   AV_PIX_FMT_ABGR,
+        AV_PIX_FMT_0RGB,   AV_PIX_FMT_0BGR,
+        AV_PIX_FMT_RGB0,   AV_PIX_FMT_BGR0,
+        AV_PIX_FMT_RGB48,  AV_PIX_FMT_BGR48,
+        AV_PIX_FMT_RGBA64, AV_PIX_FMT_BGRA64,
+        AV_PIX_FMT_NONE
+    };
+
+    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
+    return 0;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+    AVFilterContext *ctx = outlink->src;
+    ColorChannelMixerContext *cm = ctx->priv;
+    int i, j, size, *buffer;
+
+    switch (outlink->format) {
+    case AV_PIX_FMT_RGB48:
+    case AV_PIX_FMT_BGR48:
+    case AV_PIX_FMT_RGBA64:
+    case AV_PIX_FMT_BGRA64:
+        if (outlink->format == AV_PIX_FMT_RGB48 ||
+            outlink->format == AV_PIX_FMT_RGBA64) {
+            cm->rgba_map[R] = 0;
+            cm->rgba_map[G] = 1;
+            cm->rgba_map[B] = 2;
+            cm->rgba_map[A] = 3;
+        } else {
+            cm->rgba_map[R] = 2;
+            cm->rgba_map[G] = 1;
+            cm->rgba_map[B] = 0;
+            cm->rgba_map[A] = 3;
+        }
+        size = 65536;
+        break;
+    default:
+        ff_fill_rgba_map(cm->rgba_map, outlink->format);
+        size = 256;
+    }
+
+    cm->buffer = buffer = av_malloc(16 * size * sizeof(*cm->buffer));
+    if (!cm->buffer)
+        return AVERROR(ENOMEM);
+
+    for (i = 0; i < 4; i++)
+        for (j = 0; j < 4; j++, buffer += size)
+            cm->lut[i][j] = buffer;
+
+    for (i = 0; i < size; i++) {
+        cm->lut[R][R][i] = i * cm->rr;
+        cm->lut[R][G][i] = i * cm->rg;
+        cm->lut[R][B][i] = i * cm->rb;
+        cm->lut[R][A][i] = i * cm->ra;
+
+        cm->lut[G][R][i] = i * cm->gr;
+        cm->lut[G][G][i] = i * cm->gg;
+        cm->lut[G][B][i] = i * cm->gb;
+        cm->lut[G][A][i] = i * cm->ga;
+
+        cm->lut[B][R][i] = i * cm->br;
+        cm->lut[B][G][i] = i * cm->bg;
+        cm->lut[B][B][i] = i * cm->bb;
+        cm->lut[B][A][i] = i * cm->ba;
+
+        cm->lut[A][R][i] = i * cm->ar;
+        cm->lut[A][G][i] = i * cm->ag;
+        cm->lut[A][B][i] = i * cm->ab;
+        cm->lut[A][A][i] = i * cm->aa;
+    }
+
+    return 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+    AVFilterContext *ctx = inlink->dst;
+    ColorChannelMixerContext *cm = ctx->priv;
+    AVFilterLink *outlink = ctx->outputs[0];
+    const uint8_t roffset = cm->rgba_map[R];
+    const uint8_t goffset = cm->rgba_map[G];
+    const uint8_t boffset = cm->rgba_map[B];
+    const uint8_t aoffset = cm->rgba_map[A];
+    const uint8_t *srcrow = in->data[0];
+    uint8_t *dstrow;
+    AVFrame *out;
+    int i, j;
+
+    if (av_frame_is_writable(in)) {
+        out = in;
+    } else {
+        out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+        if (!out) {
+            av_frame_free(&in);
+            return AVERROR(ENOMEM);
+        }
+        av_frame_copy_props(out, in);
+    }
+
+    dstrow = out->data[0];
+    switch (outlink->format) {
+    case AV_PIX_FMT_BGR24:
+    case AV_PIX_FMT_RGB24:
+        for (i = 0; i < outlink->h; i++) {
+            const uint8_t *src = srcrow;
+            uint8_t *dst = dstrow;
+
+            for (j = 0; j < outlink->w * 3; j += 3) {
+                const uint8_t rin = src[j + roffset];
+                const uint8_t gin = src[j + goffset];
+                const uint8_t bin = src[j + boffset];
+
+                dst[j + roffset] = av_clip_uint8(cm->lut[R][R][rin] +
+                                                 cm->lut[R][G][gin] +
+                                                 cm->lut[R][B][bin]);
+                dst[j + goffset] = av_clip_uint8(cm->lut[G][R][rin] +
+                                                 cm->lut[G][G][gin] +
+                                                 cm->lut[G][B][bin]);
+                dst[j + boffset] = av_clip_uint8(cm->lut[B][R][rin] +
+                                                 cm->lut[B][G][gin] +
+                                                 cm->lut[B][B][bin]);
+            }
+
+            srcrow += in->linesize[0];
+            dstrow += out->linesize[0];
+        }
+        break;
+    case AV_PIX_FMT_0BGR:
+    case AV_PIX_FMT_0RGB:
+    case AV_PIX_FMT_BGR0:
+    case AV_PIX_FMT_RGB0:
+        for (i = 0; i < outlink->h; i++) {
+            const uint8_t *src = srcrow;
+            uint8_t *dst = dstrow;
+
+            for (j = 0; j < outlink->w * 4; j += 4) {
+                const uint8_t rin = src[j + roffset];
+                const uint8_t gin = src[j + goffset];
+                const uint8_t bin = src[j + boffset];
+
+                dst[j + roffset] = av_clip_uint8(cm->lut[R][R][rin] +
+                                                 cm->lut[R][G][gin] +
+                                                 cm->lut[R][B][bin]);
+                dst[j + goffset] = av_clip_uint8(cm->lut[G][R][rin] +
+                                                 cm->lut[G][G][gin] +
+                                                 cm->lut[G][B][bin]);
+                dst[j + boffset] = av_clip_uint8(cm->lut[B][R][rin] +
+                                                 cm->lut[B][G][gin] +
+                                                 cm->lut[B][B][bin]);
+                if (in != out)
+                    dst[j + aoffset] = 0;
+            }
+
+            srcrow += in->linesize[0];
+            dstrow += out->linesize[0];
+        }
+        break;
+    case AV_PIX_FMT_ABGR:
+    case AV_PIX_FMT_ARGB:
+    case AV_PIX_FMT_BGRA:
+    case AV_PIX_FMT_RGBA:
+        for (i = 0; i < outlink->h; i++) {
+            const uint8_t *src = srcrow;
+            uint8_t *dst = dstrow;
+
+            for (j = 0; j < outlink->w * 4; j += 4) {
+                const uint8_t rin = src[j + roffset];
+                const uint8_t gin = src[j + goffset];
+                const uint8_t bin = src[j + boffset];
+                const uint8_t ain = src[j + aoffset];
+
+                dst[j + roffset] = av_clip_uint8(cm->lut[R][R][rin] +
+                                                 cm->lut[R][G][gin] +
+                                                 cm->lut[R][B][bin] +
+                                                 cm->lut[R][A][ain]);
+                dst[j + goffset] = av_clip_uint8(cm->lut[G][R][rin] +
+                                                 cm->lut[G][G][gin] +
+                                                 cm->lut[G][B][bin] +
+                                                 cm->lut[G][A][ain]);
+                dst[j + boffset] = av_clip_uint8(cm->lut[B][R][rin] +
+                                                 cm->lut[B][G][gin] +
+                                                 cm->lut[B][B][bin] +
+                                                 cm->lut[B][A][ain]);
+                dst[j + aoffset] = av_clip_uint8(cm->lut[A][R][rin] +
+                                                 cm->lut[A][G][gin] +
+                                                 cm->lut[A][B][bin] +
+                                                 cm->lut[A][A][ain]);
+            }
+
+            srcrow += in->linesize[0];
+            dstrow += out->linesize[0];
+        }
+        break;
+    case AV_PIX_FMT_BGR48:
+    case AV_PIX_FMT_RGB48:
+        for (i = 0; i < outlink->h; i++) {
+            const uint16_t *src = (const uint16_t *)srcrow;
+            uint16_t *dst = (uint16_t *)dstrow;
+
+            for (j = 0; j < outlink->w * 3; j += 3) {
+                const uint16_t rin = src[j + roffset];
+                const uint16_t gin = src[j + goffset];
+                const uint16_t bin = src[j + boffset];
+
+                dst[j + roffset] = av_clip_uint16(cm->lut[R][R][rin] +
+                                                  cm->lut[R][G][gin] +
+                                                  cm->lut[R][B][bin]);
+                dst[j + goffset] = av_clip_uint16(cm->lut[G][R][rin] +
+                                                  cm->lut[G][G][gin] +
+                                                  cm->lut[G][B][bin]);
+                dst[j + boffset] = av_clip_uint16(cm->lut[B][R][rin] +
+                                                  cm->lut[B][G][gin] +
+                                                  cm->lut[B][B][bin]);
+            }
+
+            srcrow += in->linesize[0];
+            dstrow += out->linesize[0];
+        }
+        break;
+    case AV_PIX_FMT_BGRA64:
+    case AV_PIX_FMT_RGBA64:
+        for (i = 0; i < outlink->h; i++) {
+            const uint16_t *src = (const uint16_t *)srcrow;
+            uint16_t *dst = (uint16_t *)dstrow;
+
+            for (j = 0; j < outlink->w * 4; j += 4) {
+                const uint16_t rin = src[j + roffset];
+                const uint16_t gin = src[j + goffset];
+                const uint16_t bin = src[j + boffset];
+                const uint16_t ain = src[j + aoffset];
+
+                dst[j + roffset] = av_clip_uint16(cm->lut[R][R][rin] +
+                                                  cm->lut[R][G][gin] +
+                                                  cm->lut[R][B][bin] +
+                                                  cm->lut[R][A][ain]);
+                dst[j + goffset] = av_clip_uint16(cm->lut[G][R][rin] +
+                                                  cm->lut[G][G][gin] +
+                                                  cm->lut[G][B][bin] +
+                                                  cm->lut[G][A][ain]);
+                dst[j + boffset] = av_clip_uint16(cm->lut[B][R][rin] +
+                                                  cm->lut[B][G][gin] +
+                                                  cm->lut[B][B][bin] +
+                                                  cm->lut[B][A][ain]);
+                dst[j + aoffset] = av_clip_uint16(cm->lut[A][R][rin] +
+                                                  cm->lut[A][G][gin] +
+                                                  cm->lut[A][B][bin] +
+                                                  cm->lut[A][A][ain]);
+            }
+
+            srcrow += in->linesize[0];
+            dstrow += out->linesize[0];
+        }
+    }
+
+    if (in != out)
+        av_frame_free(&in);
+    return ff_filter_frame(ctx->outputs[0], out);
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+    ColorChannelMixerContext *cm = ctx->priv;
+
+    av_freep(&cm->buffer);
+}
+
+static const AVFilterPad colorchannelmixer_inputs[] = {
+    {
+        .name           = "default",
+        .type           = AVMEDIA_TYPE_VIDEO,
+        .filter_frame   = filter_frame,
+    },
+    { NULL }
+};
+
+static const AVFilterPad colorchannelmixer_outputs[] = {
+     {
+         .name         = "default",
+         .type         = AVMEDIA_TYPE_VIDEO,
+         .config_props = config_output,
+     },
+     { NULL }
+};
+
+AVFilter avfilter_vf_colorchannelmixer = {
+    .name          = "colorchannelmixer",
+    .description   = NULL_IF_CONFIG_SMALL("Adjust colors by mixing color channels."),
+    .priv_size     = sizeof(ColorChannelMixerContext),
+    .priv_class    = &colorchannelmixer_class,
+    .uninit        = uninit,
+    .query_formats = query_formats,
+    .inputs        = colorchannelmixer_inputs,
+    .outputs       = colorchannelmixer_outputs,
+};