libavfilter/vf_stack.c - nest-android-app/ffmpeg - Git at Google

 /*
  * Copyright (c) 2015 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/avstring.h"
 #include "libavutil/imgutils.h"
 #include "libavutil/opt.h"
 #include "libavutil/pixdesc.h"

 #include "avfilter.h"
 #include "formats.h"
 #include "internal.h"
 #include "framesync.h"
 #include "video.h"

 typedef struct StackContext {
     const AVClass *class;
     const AVPixFmtDescriptor *desc;
     int nb_inputs;
     int shortest;
     int is_vertical;
     int nb_planes;

     AVFrame **frames;
     FFFrameSync fs;
 } StackContext;

 static int query_formats(AVFilterContext *ctx)
 {
     AVFilterFormats *pix_fmts = NULL;
     int fmt, ret;

     for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
         if (!(desc->flags & AV_PIX_FMT_FLAG_PAL ||
               desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
               desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) &&
             (ret = ff_add_format(&pix_fmts, fmt)) < 0)
             return ret;
     }

     return ff_set_common_formats(ctx, pix_fmts);
 }

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

 static av_cold int init(AVFilterContext *ctx)
 {
     StackContext *s = ctx->priv;
     int i, ret;

     if (!strcmp(ctx->filter->name, "vstack"))
         s->is_vertical = 1;

     s->frames = av_calloc(s->nb_inputs, sizeof(*s->frames));
     if (!s->frames)
         return AVERROR(ENOMEM);

     for (i = 0; i < s->nb_inputs; i++) {
         AVFilterPad pad = { 0 };

         pad.type = AVMEDIA_TYPE_VIDEO;
         pad.name = av_asprintf("input%d", i);
         if (!pad.name)
             return AVERROR(ENOMEM);
         pad.filter_frame = filter_frame;

         if ((ret = ff_insert_inpad(ctx, i, &pad)) < 0) {
             av_freep(&pad.name);
             return ret;
         }
     }

     return 0;
 }

 static int process_frame(FFFrameSync *fs)
 {
     AVFilterContext *ctx = fs->parent;
     AVFilterLink *outlink = ctx->outputs[0];
     StackContext *s = fs->opaque;
     AVFrame **in = s->frames;
     AVFrame *out;
     int i, p, ret, offset[4] = { 0 };

     for (i = 0; i < s->nb_inputs; i++) {
         if ((ret = ff_framesync_get_frame(&s->fs, i, &in[i], 0)) < 0)
             return ret;
     }

     out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
     if (!out)
         return AVERROR(ENOMEM);
     out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base);

     for (i = 0; i < s->nb_inputs; i++) {
         AVFilterLink *inlink = ctx->inputs[i];
         int linesize[4];
         int height[4];

         if ((ret = av_image_fill_linesizes(linesize, inlink->format, inlink->w)) < 0) {
             av_frame_free(&out);
             return ret;
         }

         height[1] = height[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
         height[0] = height[3] = inlink->h;

         for (p = 0; p < s->nb_planes; p++) {
             if (s->is_vertical) {
                 av_image_copy_plane(out->data[p] + offset[p] * out->linesize[p],
                                     out->linesize[p],
                                     in[i]->data[p],
                                     in[i]->linesize[p],
                                     linesize[p], height[p]);
                 offset[p] += height[p];
             } else {
                 av_image_copy_plane(out->data[p] + offset[p],
                                     out->linesize[p],
                                     in[i]->data[p],
                                     in[i]->linesize[p],
                                     linesize[p], height[p]);
                 offset[p] += linesize[p];
             }
         }
     }

     return ff_filter_frame(outlink, out);
 }

 static int config_output(AVFilterLink *outlink)
 {
     AVFilterContext *ctx = outlink->src;
     StackContext *s = ctx->priv;
     AVRational time_base = ctx->inputs[0]->time_base;
     AVRational frame_rate = ctx->inputs[0]->frame_rate;
     int height = ctx->inputs[0]->h;
     int width = ctx->inputs[0]->w;
     FFFrameSyncIn *in;
     int i, ret;

     if (s->is_vertical) {
         for (i = 1; i < s->nb_inputs; i++) {
             if (ctx->inputs[i]->w != width) {
                 av_log(ctx, AV_LOG_ERROR, "Input %d width %d does not match input %d width %d.\n", i, ctx->inputs[i]->w, 0, width);
                 return AVERROR(EINVAL);
             }
             height += ctx->inputs[i]->h;
         }
     } else {
         for (i = 1; i < s->nb_inputs; i++) {
             if (ctx->inputs[i]->h != height) {
                 av_log(ctx, AV_LOG_ERROR, "Input %d height %d does not match input %d height %d.\n", i, ctx->inputs[i]->h, 0, height);
                 return AVERROR(EINVAL);
             }
             width += ctx->inputs[i]->w;
         }
     }

     s->desc = av_pix_fmt_desc_get(outlink->format);
     if (!s->desc)
         return AVERROR_BUG;
     s->nb_planes = av_pix_fmt_count_planes(outlink->format);

     outlink->w          = width;
     outlink->h          = height;
     outlink->time_base  = time_base;
     outlink->frame_rate = frame_rate;

     if ((ret = ff_framesync_init(&s->fs, ctx, s->nb_inputs)) < 0)
         return ret;

     in = s->fs.in;
     s->fs.opaque = s;
     s->fs.on_event = process_frame;

     for (i = 0; i < s->nb_inputs; i++) {
         AVFilterLink *inlink = ctx->inputs[i];

         in[i].time_base = inlink->time_base;
         in[i].sync   = 1;
         in[i].before = EXT_STOP;
         in[i].after  = s->shortest ? EXT_STOP : EXT_INFINITY;
     }

     return ff_framesync_configure(&s->fs);
 }

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

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

     ff_framesync_uninit(&s->fs);
     av_freep(&s->frames);

     for (i = 0; i < ctx->nb_inputs; i++)
         av_freep(&ctx->input_pads[i].name);
 }

 #define OFFSET(x) offsetof(StackContext, x)
 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
 static const AVOption stack_options[] = {
     { "inputs", "set number of inputs", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=2}, 2, INT_MAX, .flags = FLAGS },
     { "shortest", "force termination when the shortest input terminates", OFFSET(shortest), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, .flags = FLAGS },
     { NULL },
 };

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

 #if CONFIG_HSTACK_FILTER

 #define hstack_options stack_options
 AVFILTER_DEFINE_CLASS(hstack);

 AVFilter ff_vf_hstack = {
     .name          = "hstack",
     .description   = NULL_IF_CONFIG_SMALL("Stack video inputs horizontally."),
     .priv_size     = sizeof(StackContext),
     .priv_class    = &hstack_class,
     .query_formats = query_formats,
     .outputs       = outputs,
     .init          = init,
     .uninit        = uninit,
     .flags         = AVFILTER_FLAG_DYNAMIC_INPUTS,
 };

 #endif /* CONFIG_HSTACK_FILTER */

 #if CONFIG_VSTACK_FILTER

 #define vstack_options stack_options
 AVFILTER_DEFINE_CLASS(vstack);

 AVFilter ff_vf_vstack = {
     .name          = "vstack",
     .description   = NULL_IF_CONFIG_SMALL("Stack video inputs vertically."),
     .priv_size     = sizeof(StackContext),
     .priv_class    = &vstack_class,
     .query_formats = query_formats,
     .outputs       = outputs,
     .init          = init,
     .uninit        = uninit,
     .flags         = AVFILTER_FLAG_DYNAMIC_INPUTS,
 };

 #endif /* CONFIG_VSTACK_FILTER */
	/*
	* Copyright (c) 2015 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/avstring.h"
	#include "libavutil/imgutils.h"
	#include "libavutil/opt.h"
	#include "libavutil/pixdesc.h"

	#include "avfilter.h"
	#include "formats.h"
	#include "internal.h"
	#include "framesync.h"
	#include "video.h"

	typedef struct StackContext {
	const AVClass *class;
	const AVPixFmtDescriptor *desc;
	int nb_inputs;
	int shortest;
	int is_vertical;
	int nb_planes;

	AVFrame **frames;
	FFFrameSync fs;
	} StackContext;

	static int query_formats(AVFilterContext *ctx)
	{
	AVFilterFormats *pix_fmts = NULL;
	int fmt, ret;

	for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
	const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
	if (!(desc->flags & AV_PIX_FMT_FLAG_PAL \|\|
	desc->flags & AV_PIX_FMT_FLAG_HWACCEL \|\|
	desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) &&
	(ret = ff_add_format(&pix_fmts, fmt)) < 0)
	return ret;
	}

	return ff_set_common_formats(ctx, pix_fmts);
	}

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

	static av_cold int init(AVFilterContext *ctx)
	{
	StackContext *s = ctx->priv;
	int i, ret;

	if (!strcmp(ctx->filter->name, "vstack"))
	s->is_vertical = 1;

	s->frames = av_calloc(s->nb_inputs, sizeof(*s->frames));
	if (!s->frames)
	return AVERROR(ENOMEM);

	for (i = 0; i < s->nb_inputs; i++) {
	AVFilterPad pad = { 0 };

	pad.type = AVMEDIA_TYPE_VIDEO;
	pad.name = av_asprintf("input%d", i);
	if (!pad.name)
	return AVERROR(ENOMEM);
	pad.filter_frame = filter_frame;

	if ((ret = ff_insert_inpad(ctx, i, &pad)) < 0) {
	av_freep(&pad.name);
	return ret;
	}
	}

	return 0;
	}

	static int process_frame(FFFrameSync *fs)
	{
	AVFilterContext *ctx = fs->parent;
	AVFilterLink *outlink = ctx->outputs[0];
	StackContext *s = fs->opaque;
	AVFrame **in = s->frames;
	AVFrame *out;
	int i, p, ret, offset[4] = { 0 };

	for (i = 0; i < s->nb_inputs; i++) {
	if ((ret = ff_framesync_get_frame(&s->fs, i, &in[i], 0)) < 0)
	return ret;
	}

	out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
	if (!out)
	return AVERROR(ENOMEM);
	out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base);

	for (i = 0; i < s->nb_inputs; i++) {
	AVFilterLink *inlink = ctx->inputs[i];
	int linesize[4];
	int height[4];

	if ((ret = av_image_fill_linesizes(linesize, inlink->format, inlink->w)) < 0) {
	av_frame_free(&out);
	return ret;
	}

	height[1] = height[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
	height[0] = height[3] = inlink->h;

	for (p = 0; p < s->nb_planes; p++) {
	if (s->is_vertical) {
	av_image_copy_plane(out->data[p] + offset[p] * out->linesize[p],
	out->linesize[p],
	in[i]->data[p],
	in[i]->linesize[p],
	linesize[p], height[p]);
	offset[p] += height[p];
	} else {
	av_image_copy_plane(out->data[p] + offset[p],
	out->linesize[p],
	in[i]->data[p],
	in[i]->linesize[p],
	linesize[p], height[p]);
	offset[p] += linesize[p];
	}
	}
	}

	return ff_filter_frame(outlink, out);
	}

	static int config_output(AVFilterLink *outlink)
	{
	AVFilterContext *ctx = outlink->src;
	StackContext *s = ctx->priv;
	AVRational time_base = ctx->inputs[0]->time_base;
	AVRational frame_rate = ctx->inputs[0]->frame_rate;
	int height = ctx->inputs[0]->h;
	int width = ctx->inputs[0]->w;
	FFFrameSyncIn *in;
	int i, ret;

	if (s->is_vertical) {
	for (i = 1; i < s->nb_inputs; i++) {
	if (ctx->inputs[i]->w != width) {
	av_log(ctx, AV_LOG_ERROR, "Input %d width %d does not match input %d width %d.\n", i, ctx->inputs[i]->w, 0, width);
	return AVERROR(EINVAL);
	}
	height += ctx->inputs[i]->h;
	}
	} else {
	for (i = 1; i < s->nb_inputs; i++) {
	if (ctx->inputs[i]->h != height) {
	av_log(ctx, AV_LOG_ERROR, "Input %d height %d does not match input %d height %d.\n", i, ctx->inputs[i]->h, 0, height);
	return AVERROR(EINVAL);
	}
	width += ctx->inputs[i]->w;
	}
	}

	s->desc = av_pix_fmt_desc_get(outlink->format);
	if (!s->desc)
	return AVERROR_BUG;
	s->nb_planes = av_pix_fmt_count_planes(outlink->format);

	outlink->w = width;
	outlink->h = height;
	outlink->time_base = time_base;
	outlink->frame_rate = frame_rate;

	if ((ret = ff_framesync_init(&s->fs, ctx, s->nb_inputs)) < 0)
	return ret;

	in = s->fs.in;
	s->fs.opaque = s;
	s->fs.on_event = process_frame;

	for (i = 0; i < s->nb_inputs; i++) {
	AVFilterLink *inlink = ctx->inputs[i];

	in[i].time_base = inlink->time_base;
	in[i].sync = 1;
	in[i].before = EXT_STOP;
	in[i].after = s->shortest ? EXT_STOP : EXT_INFINITY;
	}

	return ff_framesync_configure(&s->fs);
	}

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

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

	ff_framesync_uninit(&s->fs);
	av_freep(&s->frames);

	for (i = 0; i < ctx->nb_inputs; i++)
	av_freep(&ctx->input_pads[i].name);
	}

	#define OFFSET(x) offsetof(StackContext, x)
	#define FLAGS AV_OPT_FLAG_VIDEO_PARAM \| AV_OPT_FLAG_FILTERING_PARAM
	static const AVOption stack_options[] = {
	{ "inputs", "set number of inputs", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=2}, 2, INT_MAX, .flags = FLAGS },
	{ "shortest", "force termination when the shortest input terminates", OFFSET(shortest), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, .flags = FLAGS },
	{ NULL },
	};

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

	#if CONFIG_HSTACK_FILTER

	#define hstack_options stack_options
	AVFILTER_DEFINE_CLASS(hstack);

	AVFilter ff_vf_hstack = {
	.name = "hstack",
	.description = NULL_IF_CONFIG_SMALL("Stack video inputs horizontally."),
	.priv_size = sizeof(StackContext),
	.priv_class = &hstack_class,
	.query_formats = query_formats,
	.outputs = outputs,
	.init = init,
	.uninit = uninit,
	.flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
	};

	#endif /* CONFIG_HSTACK_FILTER */

	#if CONFIG_VSTACK_FILTER

	#define vstack_options stack_options
	AVFILTER_DEFINE_CLASS(vstack);

	AVFilter ff_vf_vstack = {
	.name = "vstack",
	.description = NULL_IF_CONFIG_SMALL("Stack video inputs vertically."),
	.priv_size = sizeof(StackContext),
	.priv_class = &vstack_class,
	.query_formats = query_formats,
	.outputs = outputs,
	.init = init,
	.uninit = uninit,
	.flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
	};

	#endif /* CONFIG_VSTACK_FILTER */