Signed-off-by: Paul B Mahol <one...@gmail.com>
---
doc/filters.texi | 13 ++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_unpremultiply.c | 431 +++++++++++++++++++++++++++++++++++++++++
4 files changed, 446 insertions(+)
create mode 100644 libavfilter/vf_unpremultiply.c
diff --git a/doc/filters.texi b/doc/filters.texi
index 4089135..a50696a 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -14532,6 +14532,19 @@ ffmpeg -i INPUT -vf trim=duration=1
@end itemize
+@section unpremultiply
+Apply alpha unpremultiply effect to input video stream using first plane
+of second stream as alpha.
+
+Both streams must have same dimensions and same pixel format.
+
+The filter accepts the following option:
+
+@table @option
+@item planes
+Set which planes will be processed, unprocessed planes will be copied.
+By default value 0xf, all planes will be processed.
+@end table
@anchor{unsharp}
@section unsharp
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 4d61d78..c093736 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -314,6 +314,7 @@ OBJS-$(CONFIG_TILE_FILTER) += vf_tile.o
OBJS-$(CONFIG_TINTERLACE_FILTER) += vf_tinterlace.o
OBJS-$(CONFIG_TRANSPOSE_FILTER) += vf_transpose.o
OBJS-$(CONFIG_TRIM_FILTER) += trim.o
+OBJS-$(CONFIG_UNPREMULTIPLY_FILTER) += vf_unpremultiply.o
OBJS-$(CONFIG_UNSHARP_FILTER) += vf_unsharp.o
OBJS-$(CONFIG_USPP_FILTER) += vf_uspp.o
OBJS-$(CONFIG_VAGUEDENOISER_FILTER) += vf_vaguedenoiser.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index b1c2d11..0fca662 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -325,6 +325,7 @@ static void register_all(void)
REGISTER_FILTER(TINTERLACE, tinterlace, vf);
REGISTER_FILTER(TRANSPOSE, transpose, vf);
REGISTER_FILTER(TRIM, trim, vf);
+ REGISTER_FILTER(UNPREMULTIPLY, unpremultiply, vf);
REGISTER_FILTER(UNSHARP, unsharp, vf);
REGISTER_FILTER(USPP, uspp, vf);
REGISTER_FILTER(VAGUEDENOISER, vaguedenoiser, vf);
diff --git a/libavfilter/vf_unpremultiply.c b/libavfilter/vf_unpremultiply.c
new file mode 100644
index 0000000..2e0d09a
--- /dev/null
+++ b/libavfilter/vf_unpremultiply.c
@@ -0,0 +1,431 @@
+/*
+ * Copyright (c) 2017 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/imgutils.h"
+#include "libavutil/pixdesc.h"
+#include "libavutil/opt.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "framesync2.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct UnPreMultiplyContext {
+ const AVClass *class;
+ int width[4], height[4];
+ int linesize[4];
+ int nb_planes;
+ int planes;
+ int half, max, offset;
+ FFFrameSync fs;
+
+ void (*unpremultiply[4])(const uint8_t *msrc, const uint8_t *asrc,
+ uint8_t *dst,
+ ptrdiff_t mlinesize, ptrdiff_t alinesize,
+ ptrdiff_t dlinesize,
+ int w, int h,
+ int half, int max, int offset);
+} UnPreMultiplyContext;
+
+#define OFFSET(x) offsetof(UnPreMultiplyContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+static const AVOption unpremultiply_options[] = {
+ { "planes", "set planes", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=0xF}, 0,
0xF, FLAGS },
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(unpremultiply);
+
+static int query_formats(AVFilterContext *ctx)
+{
+ static const enum AVPixelFormat pix_fmts[] = {
+ AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P,
+ AV_PIX_FMT_YUV444P9, AV_PIX_FMT_YUV444P10,
+ AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV444P14,
+ AV_PIX_FMT_YUV444P16,
+ AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
+ AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
+ AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12,
AV_PIX_FMT_GRAY16,
+ AV_PIX_FMT_NONE
+ };
+
+ return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
+}
+
+static void unpremultiply8(const uint8_t *msrc, const uint8_t *asrc,
+ uint8_t *dst,
+ ptrdiff_t mlinesize, ptrdiff_t alinesize,
+ ptrdiff_t dlinesize,
+ int w, int h,
+ int half, int max, int offset)
+{
+ int x, y;
+
+ for (y = 0; y < h; y++) {
+ for (x = 0; x < w; x++) {
+ if (asrc[x] > 0 && asrc[x] < 255)
+ dst[x] = FFMIN(msrc[x] * 255 / asrc[x], 255);
+ else
+ dst[x] = msrc[x];
+ }
+
+ dst += dlinesize;
+ msrc += mlinesize;
+ asrc += alinesize;
+ }
+}
+
+static void unpremultiply8yuv(const uint8_t *msrc, const uint8_t *asrc,
+ uint8_t *dst,
+ ptrdiff_t mlinesize, ptrdiff_t alinesize,
+ ptrdiff_t dlinesize,
+ int w, int h,
+ int half, int max, int offset)
+{
+ int x, y;
+
+ for (y = 0; y < h; y++) {
+ for (x = 0; x < w; x++) {
+ if (asrc[x] > 0 && asrc[x] < 255)
+ dst[x] = FFMIN((msrc[x] - 128) * 255 / asrc[x] + 128, 255);
+ else
+ dst[x] = msrc[x];
+ }
+
+ dst += dlinesize;
+ msrc += mlinesize;
+ asrc += alinesize;
+ }
+}
+
+static void unpremultiply8offset(const uint8_t *msrc, const uint8_t *asrc,
+ uint8_t *dst,
+ ptrdiff_t mlinesize, ptrdiff_t alinesize,
+ ptrdiff_t dlinesize,
+ int w, int h,
+ int half, int max, int offset)
+{
+ int x, y;
+
+ for (y = 0; y < h; y++) {
+ for (x = 0; x < w; x++) {
+ if (asrc[x] > 0 && asrc[x] < 255)
+ dst[x] = FFMIN((msrc[x] - offset) * 255 / asrc[x] + offset,
255);
+ else
+ dst[x] = msrc[x];
+ }
+
+ dst += dlinesize;
+ msrc += mlinesize;
+ asrc += alinesize;
+ }
+}
+
+static void unpremultiply16(const uint8_t *mmsrc, const uint8_t *aasrc,
+ uint8_t *ddst,
+ ptrdiff_t mlinesize, ptrdiff_t alinesize,
+ ptrdiff_t dlinesize,
+ int w, int h,
+ int half, int max, int offset)
+{
+ const uint16_t *msrc = (const uint16_t *)mmsrc;
+ const uint16_t *asrc = (const uint16_t *)aasrc;
+ uint16_t *dst = (uint16_t *)ddst;
+ int x, y;
+
+ for (y = 0; y < h; y++) {
+ for (x = 0; x < w; x++) {
+ if (asrc[x] > 0 && asrc[x] < max)
+ dst[x] = FFMIN(msrc[x] * max / asrc[x], max);
+ else
+ dst[x] = msrc[x];
+ }
+
+ dst += dlinesize / 2;
+ msrc += mlinesize / 2;
+ asrc += alinesize / 2;
+ }
+}
+
+static void unpremultiply16yuv(const uint8_t *mmsrc, const uint8_t *aasrc,
+ uint8_t *ddst,
+ ptrdiff_t mlinesize, ptrdiff_t alinesize,
+ ptrdiff_t dlinesize,
+ int w, int h,
+ int half, int max, int offset)
+{
+ const uint16_t *msrc = (const uint16_t *)mmsrc;
+ const uint16_t *asrc = (const uint16_t *)aasrc;
+ uint16_t *dst = (uint16_t *)ddst;
+ int x, y;
+
+ for (y = 0; y < h; y++) {
+ for (x = 0; x < w; x++) {
+ if (asrc[x] > 0 && asrc[x] < max)
+ dst[x] = FFMIN((msrc[x] - half) * max / asrc[x] + half, max);
+ else
+ dst[x] = msrc[x];
+ }
+
+ dst += dlinesize / 2;
+ msrc += mlinesize / 2;
+ asrc += alinesize / 2;
+ }
+}
+
+static void unpremultiply16offset(const uint8_t *mmsrc, const uint8_t *aasrc,
+ uint8_t *ddst,
+ ptrdiff_t mlinesize, ptrdiff_t alinesize,
+ ptrdiff_t dlinesize,
+ int w, int h,
+ int half, int max, int offset)
+{
+ const uint16_t *msrc = (const uint16_t *)mmsrc;
+ const uint16_t *asrc = (const uint16_t *)aasrc;
+ uint16_t *dst = (uint16_t *)ddst;
+ int x, y;
+
+ for (y = 0; y < h; y++) {
+ for (x = 0; x < w; x++) {
+ if (asrc[x] > 0 && asrc[x] < max)
+ dst[x] = FFMIN((msrc[x] - offset) * max / asrc[x] + offset,
max);
+ else
+ dst[x] = msrc[x];
+ }
+
+ dst += dlinesize / 2;
+ msrc += mlinesize / 2;
+ asrc += alinesize / 2;
+ }
+}
+
+static int process_frame(FFFrameSync *fs)
+{
+ AVFilterContext *ctx = fs->parent;
+ UnPreMultiplyContext *s = fs->opaque;
+ AVFilterLink *outlink = ctx->outputs[0];
+ AVFrame *out, *base, *alpha;
+ int ret;
+
+ if ((ret = ff_framesync2_get_frame(&s->fs, 0, &base, 0)) < 0 ||
+ (ret = ff_framesync2_get_frame(&s->fs, 1, &alpha, 0)) < 0)
+ return ret;
+
+ if (ctx->is_disabled) {
+ out = av_frame_clone(base);
+ if (!out)
+ return AVERROR(ENOMEM);
+ } else {
+ int p, full, limited;
+
+ out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+ if (!out)
+ return AVERROR(ENOMEM);
+ av_frame_copy_props(out, base);
+
+ full = base->color_range == AVCOL_RANGE_JPEG;
+ limited = base->color_range == AVCOL_RANGE_MPEG;
+
+ switch (outlink->format) {
+ case AV_PIX_FMT_YUV444P:
+ s->unpremultiply[0] = full ? unpremultiply8 : unpremultiply8offset;
+ s->unpremultiply[1] = unpremultiply8yuv;
+ s->unpremultiply[2] = unpremultiply8yuv;
+ break;
+ case AV_PIX_FMT_YUVJ444P:
+ s->unpremultiply[0] = unpremultiply8;
+ s->unpremultiply[1] = unpremultiply8yuv;
+ s->unpremultiply[2] = unpremultiply8yuv;
+ break;
+ case AV_PIX_FMT_GBRP:
+ s->unpremultiply[0] = limited ? unpremultiply8offset :
unpremultiply8;
+ s->unpremultiply[1] = limited ? unpremultiply8offset :
unpremultiply8;
+ s->unpremultiply[2] = limited ? unpremultiply8offset :
unpremultiply8;
+ break;
+ case AV_PIX_FMT_YUV444P9:
+ case AV_PIX_FMT_YUV444P10:
+ case AV_PIX_FMT_YUV444P12:
+ case AV_PIX_FMT_YUV444P14:
+ case AV_PIX_FMT_YUV444P16:
+ s->unpremultiply[0] = full ? unpremultiply16 :
unpremultiply16offset;
+ s->unpremultiply[1] = unpremultiply16yuv;
+ s->unpremultiply[2] = unpremultiply16yuv;
+ break;
+ case AV_PIX_FMT_GBRP9:
+ case AV_PIX_FMT_GBRP10:
+ case AV_PIX_FMT_GBRP12:
+ case AV_PIX_FMT_GBRP14:
+ case AV_PIX_FMT_GBRP16:
+ s->unpremultiply[0] = limited ? unpremultiply16offset :
unpremultiply16;
+ s->unpremultiply[1] = limited ? unpremultiply16offset :
unpremultiply16;
+ s->unpremultiply[2] = limited ? unpremultiply16offset :
unpremultiply16;
+ break;
+ case AV_PIX_FMT_GRAY8:
+ s->unpremultiply[0] = limited ? unpremultiply8offset :
unpremultiply8;
+ break;
+ case AV_PIX_FMT_GRAY10:
+ case AV_PIX_FMT_GRAY12:
+ case AV_PIX_FMT_GRAY16:
+ s->unpremultiply[0] = limited ? unpremultiply16offset :
unpremultiply16;
+ break;
+ }
+
+ for (p = 0; p < s->nb_planes; p++) {
+ if (!((1 << p) & s->planes)) {
+ av_image_copy_plane(out->data[p], out->linesize[p],
base->data[p], base->linesize[p],
+ s->linesize[p], s->height[p]);
+ continue;
+ }
+
+ s->unpremultiply[p](base->data[p], alpha->data[0],
+ out->data[p],
+ base->linesize[p], alpha->linesize[0],
+ out->linesize[p],
+ s->width[p], s->height[p],
+ s->half, s->max, s->offset);
+ }
+ }
+ out->pts = av_rescale_q(base->pts, s->fs.time_base, outlink->time_base);
+
+ return ff_filter_frame(outlink, out);
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+ AVFilterContext *ctx = inlink->dst;
+ UnPreMultiplyContext *s = ctx->priv;
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+ int vsub, hsub, ret, depth;
+
+ s->nb_planes = av_pix_fmt_count_planes(inlink->format);
+
+ if ((ret = av_image_fill_linesizes(s->linesize, inlink->format,
inlink->w)) < 0)
+ return ret;
+
+ hsub = desc->log2_chroma_w;
+ vsub = desc->log2_chroma_h;
+ s->height[1] = s->height[2] = AV_CEIL_RSHIFT(inlink->h, vsub);
+ s->height[0] = s->height[3] = inlink->h;
+ s->width[1] = s->width[2] = AV_CEIL_RSHIFT(inlink->w, hsub);
+ s->width[0] = s->width[3] = inlink->w;
+
+ depth = desc->comp[0].depth;
+ s->max = (1 << depth) - 1;
+ s->half = (1 << depth) / 2;
+ s->offset = 16 << (depth - 8);
+
+ return 0;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ UnPreMultiplyContext *s = ctx->priv;
+ AVFilterLink *base = ctx->inputs[0];
+ AVFilterLink *alpha = ctx->inputs[1];
+ FFFrameSyncIn *in;
+ int ret;
+
+ if (base->format != alpha->format) {
+ av_log(ctx, AV_LOG_ERROR, "inputs must be of same pixel format\n");
+ return AVERROR(EINVAL);
+ }
+ if (base->w != alpha->w ||
+ base->h != alpha->h) {
+ av_log(ctx, AV_LOG_ERROR, "First input link %s parameters "
+ "(size %dx%d) do not match the corresponding "
+ "second input link %s parameters (%dx%d) ",
+ ctx->input_pads[0].name, base->w, base->h,
+ ctx->input_pads[1].name, alpha->w, alpha->h);
+ return AVERROR(EINVAL);
+ }
+
+ outlink->w = base->w;
+ outlink->h = base->h;
+ outlink->time_base = base->time_base;
+ outlink->sample_aspect_ratio = base->sample_aspect_ratio;
+ outlink->frame_rate = base->frame_rate;
+
+ if ((ret = ff_framesync2_init(&s->fs, ctx, 2)) < 0)
+ return ret;
+
+ in = s->fs.in;
+ in[0].time_base = base->time_base;
+ in[1].time_base = alpha->time_base;
+ in[0].sync = 1;
+ in[0].before = EXT_STOP;
+ in[0].after = EXT_INFINITY;
+ in[1].sync = 1;
+ in[1].before = EXT_STOP;
+ in[1].after = EXT_INFINITY;
+ s->fs.opaque = s;
+ s->fs.on_event = process_frame;
+
+ return ff_framesync2_configure(&s->fs);
+}
+
+static int activate(AVFilterContext *ctx)
+{
+ UnPreMultiplyContext *s = ctx->priv;
+ return ff_framesync2_activate(&s->fs);
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ UnPreMultiplyContext *s = ctx->priv;
+
+ ff_framesync2_uninit(&s->fs);
+}
+
+static const AVFilterPad unpremultiply_inputs[] = {
+ {
+ .name = "main",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_input,
+ },
+ {
+ .name = "alpha",
+ .type = AVMEDIA_TYPE_VIDEO,
+ },
+ { NULL }
+};
+
+static const AVFilterPad unpremultiply_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_output,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_unpremultiply = {
+ .name = "unpremultiply",
+ .description = NULL_IF_CONFIG_SMALL("UnPreMultiply first stream with
first plane of second stream."),
+ .priv_size = sizeof(UnPreMultiplyContext),
+ .uninit = uninit,
+ .query_formats = query_formats,
+ .activate = activate,
+ .inputs = unpremultiply_inputs,
+ .outputs = unpremultiply_outputs,
+ .priv_class = &unpremultiply_class,
+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
+};
--
2.9.3
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