libavfilter/vf_premultiply.c - third_party/ffmpeg - Git at Google

 /*
  * Copyright (c) 2016 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 "framesync.h"
 #include "internal.h"
 #include "video.h"

 typedef struct PreMultiplyContext {
     const AVClass *class;
     int width[4], height[4];
     int nb_planes;
     int planes;
     int half, depth, offset;
     FFFrameSync fs;

     void (*premultiply[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 shift, int offset);
 } PreMultiplyContext;

 #define OFFSET(x) offsetof(PreMultiplyContext, x)
 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

 static const AVOption premultiply_options[] = {
     { NULL }
 };

 AVFILTER_DEFINE_CLASS(premultiply);

 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 premultiply8(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 shift, int offset)
 {
     int x, y;

     for (y = 0; y < h; y++) {
         for (x = 0; x < w; x++) {
             dst[x] = ((msrc[x] * (((asrc[x] >> 1) & 1) + asrc[x])) + 128) >> 8;
         }

         dst  += dlinesize;
         msrc += mlinesize;
         asrc += alinesize;
     }
 }

 static void premultiply8yuv(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 shift, int offset)
 {
     int x, y;

     for (y = 0; y < h; y++) {
         for (x = 0; x < w; x++) {
             dst[x] = ((((msrc[x] - 128) * (((asrc[x] >> 1) & 1) + asrc[x]))) >> 8) + 128;
         }

         dst  += dlinesize;
         msrc += mlinesize;
         asrc += alinesize;
     }
 }

 static void premultiply8offset(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 shift, int offset)
 {
     int x, y;

     for (y = 0; y < h; y++) {
         for (x = 0; x < w; x++) {
             dst[x] = ((((msrc[x] - offset) * (((asrc[x] >> 1) & 1) + asrc[x])) + 128) >> 8) + offset;
         }

         dst  += dlinesize;
         msrc += mlinesize;
         asrc += alinesize;
     }
 }

 static void premultiply16(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 shift, 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++) {
             dst[x] = ((msrc[x] * (((asrc[x] >> 1) & 1) + asrc[x])) + half) >> shift;
         }

         dst  += dlinesize / 2;
         msrc += mlinesize / 2;
         asrc += alinesize / 2;
     }
 }

 static void premultiply16yuv(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 shift, 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++) {
             dst[x] = ((((msrc[x] - half) * (((asrc[x] >> 1) & 1) + asrc[x]))) >> shift) + half;
         }

         dst  += dlinesize / 2;
         msrc += mlinesize / 2;
         asrc += alinesize / 2;
     }
 }

 static void premultiply16offset(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 shift, 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++) {
             dst[x] = ((((msrc[x] - offset) * (((asrc[x] >> 1) & 1) + asrc[x])) + half) >> shift) + offset;
         }

         dst  += dlinesize / 2;
         msrc += mlinesize / 2;
         asrc += alinesize / 2;
     }
 }

 static int process_frame(FFFrameSync *fs)
 {
     AVFilterContext *ctx = fs->parent;
     PreMultiplyContext *s = fs->opaque;
     AVFilterLink *outlink = ctx->outputs[0];
     AVFrame *out, *base, *alpha;
     int ret;

     if ((ret = ff_framesync_get_frame(&s->fs, 0, &base,  0)) < 0 ||
         (ret = ff_framesync_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->premultiply[0] = full ? premultiply8 : premultiply8offset;
             s->premultiply[1] = premultiply8yuv;
             s->premultiply[2] = premultiply8yuv;
             break;
         case AV_PIX_FMT_YUVJ444P:
             s->premultiply[0] = premultiply8;
             s->premultiply[1] = premultiply8yuv;
             s->premultiply[2] = premultiply8yuv;
             break;
         case AV_PIX_FMT_GBRP:
             s->premultiply[0] = limited ? premultiply8offset : premultiply8;
             s->premultiply[1] = limited ? premultiply8offset : premultiply8;
             s->premultiply[2] = limited ? premultiply8offset : premultiply8;
             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->premultiply[0] = full ? premultiply16 : premultiply16offset;
             s->premultiply[1] = premultiply16yuv;
             s->premultiply[2] = premultiply16yuv;
             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->premultiply[0] = limited ? premultiply16offset : premultiply16;
             s->premultiply[1] = limited ? premultiply16offset : premultiply16;
             s->premultiply[2] = limited ? premultiply16offset : premultiply16;
             break;
         case AV_PIX_FMT_GRAY8:
             s->premultiply[0] = limited ? premultiply8offset : premultiply8;
             break;
         case AV_PIX_FMT_GRAY10:
         case AV_PIX_FMT_GRAY12:
         case AV_PIX_FMT_GRAY16:
             s->premultiply[0] = limited ? premultiply16offset : premultiply16;
             break;
         }

         for (p = 0; p < s->nb_planes; p++) {
             s->premultiply[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->depth, 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;
     PreMultiplyContext *s = ctx->priv;
     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
     int vsub, hsub;

     s->nb_planes = av_pix_fmt_count_planes(inlink->format);

     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;

     s->depth = desc->comp[0].depth;
     s->half = (1 << s->depth) / 2;
     s->offset = 16 << (s->depth - 8);

     return 0;
 }

 static int config_output(AVFilterLink *outlink)
 {
     AVFilterContext *ctx = outlink->src;
     PreMultiplyContext *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_framesync_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_framesync_configure(&s->fs);
 }

 static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
 {
     PreMultiplyContext *s = inlink->dst->priv;
     return ff_framesync_filter_frame(&s->fs, inlink, buf);
 }

 static int request_frame(AVFilterLink *outlink)
 {
     PreMultiplyContext *s = outlink->src->priv;
     return ff_framesync_request_frame(&s->fs, outlink);
 }

 static av_cold void uninit(AVFilterContext *ctx)
 {
     PreMultiplyContext *s = ctx->priv;

     ff_framesync_uninit(&s->fs);
 }

 static const AVFilterPad premultiply_inputs[] = {
     {
         .name         = "main",
         .type         = AVMEDIA_TYPE_VIDEO,
         .filter_frame = filter_frame,
         .config_props = config_input,
     },
     {
         .name         = "alpha",
         .type         = AVMEDIA_TYPE_VIDEO,
         .filter_frame = filter_frame,
     },
     { NULL }
 };

 static const AVFilterPad premultiply_outputs[] = {
     {
         .name          = "default",
         .type          = AVMEDIA_TYPE_VIDEO,
         .config_props  = config_output,
         .request_frame = request_frame,
     },
     { NULL }
 };

 AVFilter ff_vf_premultiply = {
     .name          = "premultiply",
     .description   = NULL_IF_CONFIG_SMALL("PreMultiply first stream with first plane of second stream."),
     .priv_size     = sizeof(PreMultiplyContext),
     .uninit        = uninit,
     .query_formats = query_formats,
     .inputs        = premultiply_inputs,
     .outputs       = premultiply_outputs,
     .priv_class    = &premultiply_class,
     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
 };
	/*
	* Copyright (c) 2016 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 "framesync.h"
	#include "internal.h"
	#include "video.h"

	typedef struct PreMultiplyContext {
	const AVClass *class;
	int width[4], height[4];
	int nb_planes;
	int planes;
	int half, depth, offset;
	FFFrameSync fs;

	void (premultiply[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 shift, int offset);
	} PreMultiplyContext;

	#define OFFSET(x) offsetof(PreMultiplyContext, x)
	#define FLAGS AV_OPT_FLAG_FILTERING_PARAM\|AV_OPT_FLAG_VIDEO_PARAM

	static const AVOption premultiply_options[] = {
	{ NULL }
	};

	AVFILTER_DEFINE_CLASS(premultiply);

	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 premultiply8(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 shift, int offset)
	{
	int x, y;

	for (y = 0; y < h; y++) {
	for (x = 0; x < w; x++) {
	dst[x] = ((msrc[x] * (((asrc[x] >> 1) & 1) + asrc[x])) + 128) >> 8;
	}

	dst += dlinesize;
	msrc += mlinesize;
	asrc += alinesize;
	}
	}

	static void premultiply8yuv(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 shift, int offset)
	{
	int x, y;

	for (y = 0; y < h; y++) {
	for (x = 0; x < w; x++) {
	dst[x] = ((((msrc[x] - 128) * (((asrc[x] >> 1) & 1) + asrc[x]))) >> 8) + 128;
	}

	dst += dlinesize;
	msrc += mlinesize;
	asrc += alinesize;
	}
	}

	static void premultiply8offset(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 shift, int offset)
	{
	int x, y;

	for (y = 0; y < h; y++) {
	for (x = 0; x < w; x++) {
	dst[x] = ((((msrc[x] - offset) * (((asrc[x] >> 1) & 1) + asrc[x])) + 128) >> 8) + offset;
	}

	dst += dlinesize;
	msrc += mlinesize;
	asrc += alinesize;
	}
	}

	static void premultiply16(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 shift, 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++) {
	dst[x] = ((msrc[x] * (((asrc[x] >> 1) & 1) + asrc[x])) + half) >> shift;
	}

	dst += dlinesize / 2;
	msrc += mlinesize / 2;
	asrc += alinesize / 2;
	}
	}

	static void premultiply16yuv(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 shift, 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++) {
	dst[x] = ((((msrc[x] - half) * (((asrc[x] >> 1) & 1) + asrc[x]))) >> shift) + half;
	}

	dst += dlinesize / 2;
	msrc += mlinesize / 2;
	asrc += alinesize / 2;
	}
	}

	static void premultiply16offset(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 shift, 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++) {
	dst[x] = ((((msrc[x] - offset) * (((asrc[x] >> 1) & 1) + asrc[x])) + half) >> shift) + offset;
	}

	dst += dlinesize / 2;
	msrc += mlinesize / 2;
	asrc += alinesize / 2;
	}
	}

	static int process_frame(FFFrameSync *fs)
	{
	AVFilterContext *ctx = fs->parent;
	PreMultiplyContext *s = fs->opaque;
	AVFilterLink *outlink = ctx->outputs[0];
	AVFrame out, base, *alpha;
	int ret;

	if ((ret = ff_framesync_get_frame(&s->fs, 0, &base, 0)) < 0 \|\|
	(ret = ff_framesync_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->premultiply[0] = full ? premultiply8 : premultiply8offset;
	s->premultiply[1] = premultiply8yuv;
	s->premultiply[2] = premultiply8yuv;
	break;
	case AV_PIX_FMT_YUVJ444P:
	s->premultiply[0] = premultiply8;
	s->premultiply[1] = premultiply8yuv;
	s->premultiply[2] = premultiply8yuv;
	break;
	case AV_PIX_FMT_GBRP:
	s->premultiply[0] = limited ? premultiply8offset : premultiply8;
	s->premultiply[1] = limited ? premultiply8offset : premultiply8;
	s->premultiply[2] = limited ? premultiply8offset : premultiply8;
	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->premultiply[0] = full ? premultiply16 : premultiply16offset;
	s->premultiply[1] = premultiply16yuv;
	s->premultiply[2] = premultiply16yuv;
	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->premultiply[0] = limited ? premultiply16offset : premultiply16;
	s->premultiply[1] = limited ? premultiply16offset : premultiply16;
	s->premultiply[2] = limited ? premultiply16offset : premultiply16;
	break;
	case AV_PIX_FMT_GRAY8:
	s->premultiply[0] = limited ? premultiply8offset : premultiply8;
	break;
	case AV_PIX_FMT_GRAY10:
	case AV_PIX_FMT_GRAY12:
	case AV_PIX_FMT_GRAY16:
	s->premultiply[0] = limited ? premultiply16offset : premultiply16;
	break;
	}

	for (p = 0; p < s->nb_planes; p++) {
	s->premultiply[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->depth, 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;
	PreMultiplyContext *s = ctx->priv;
	const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
	int vsub, hsub;

	s->nb_planes = av_pix_fmt_count_planes(inlink->format);

	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;

	s->depth = desc->comp[0].depth;
	s->half = (1 << s->depth) / 2;
	s->offset = 16 << (s->depth - 8);

	return 0;
	}

	static int config_output(AVFilterLink *outlink)
	{
	AVFilterContext *ctx = outlink->src;
	PreMultiplyContext *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_framesync_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_framesync_configure(&s->fs);
	}

	static int filter_frame(AVFilterLink inlink, AVFrame buf)
	{
	PreMultiplyContext *s = inlink->dst->priv;
	return ff_framesync_filter_frame(&s->fs, inlink, buf);
	}

	static int request_frame(AVFilterLink *outlink)
	{
	PreMultiplyContext *s = outlink->src->priv;
	return ff_framesync_request_frame(&s->fs, outlink);
	}

	static av_cold void uninit(AVFilterContext *ctx)
	{
	PreMultiplyContext *s = ctx->priv;

	ff_framesync_uninit(&s->fs);
	}

	static const AVFilterPad premultiply_inputs[] = {
	{
	.name = "main",
	.type = AVMEDIA_TYPE_VIDEO,
	.filter_frame = filter_frame,
	.config_props = config_input,
	},
	{
	.name = "alpha",
	.type = AVMEDIA_TYPE_VIDEO,
	.filter_frame = filter_frame,
	},
	{ NULL }
	};

	static const AVFilterPad premultiply_outputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_VIDEO,
	.config_props = config_output,
	.request_frame = request_frame,
	},
	{ NULL }
	};

	AVFilter ff_vf_premultiply = {
	.name = "premultiply",
	.description = NULL_IF_CONFIG_SMALL("PreMultiply first stream with first plane of second stream."),
	.priv_size = sizeof(PreMultiplyContext),
	.uninit = uninit,
	.query_formats = query_formats,
	.inputs = premultiply_inputs,
	.outputs = premultiply_outputs,
	.priv_class = &premultiply_class,
	.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
	};