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

 /*
  * Copyright (c) 2003 Michael Zucchi <notzed@ximian.com>
  * Copyright (c) 2010 Baptiste Coudurier
  * Copyright (c) 2011 Stefano Sabatini
  * Copyright (c) 2013 Vittorio Giovara <vittorio.giovara@gmail.com>
  *
  * 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.
  */

 /**
  * @file
  * progressive to interlaced content filter, inspired by heavy debugging of tinterlace filter
  */

 #include "libavutil/common.h"
 #include "libavutil/opt.h"
 #include "libavutil/imgutils.h"
 #include "libavutil/avassert.h"

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

 #define OFFSET(x) offsetof(InterlaceContext, x)
 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
 static const AVOption interlace_options[] = {
     { "scan", "scanning mode", OFFSET(scan),
         AV_OPT_TYPE_INT,   {.i64 = MODE_TFF }, 0, 1, .flags = FLAGS, .unit = "scan" },
     { "tff", "top field first", 0,
         AV_OPT_TYPE_CONST, {.i64 = MODE_TFF }, INT_MIN, INT_MAX, .flags = FLAGS, .unit = "scan" },
     { "bff", "bottom field first", 0,
         AV_OPT_TYPE_CONST, {.i64 = MODE_BFF }, INT_MIN, INT_MAX, .flags = FLAGS, .unit = "scan" },
     { "lowpass", "set vertical low-pass filter", OFFSET(lowpass),
         AV_OPT_TYPE_BOOL,  {.i64 = 1 },        0, 1, .flags = FLAGS },
     { NULL }
 };

 AVFILTER_DEFINE_CLASS(interlace);

 static void lowpass_line_c(uint8_t *dstp, ptrdiff_t linesize,
                            const uint8_t *srcp,
                            const uint8_t *srcp_above,
                            const uint8_t *srcp_below)
 {
     int i;
     for (i = 0; i < linesize; i++) {
         // this calculation is an integer representation of
         // '0.5 * current + 0.25 * above + 0.25 * below'
         // '1 +' is for rounding.
         dstp[i] = (1 + srcp[i] + srcp[i] + srcp_above[i] + srcp_below[i]) >> 2;
     }
 }

 static const enum AVPixelFormat formats_supported[] = {
     AV_PIX_FMT_YUV420P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV444P,
     AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV410P,  AV_PIX_FMT_YUVA420P,
     AV_PIX_FMT_GRAY8,    AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
     AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_NONE
 };

 static int query_formats(AVFilterContext *ctx)
 {
     AVFilterFormats *fmts_list = ff_make_format_list(formats_supported);
     if (!fmts_list)
         return AVERROR(ENOMEM);
     return ff_set_common_formats(ctx, fmts_list);
 }

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

     av_frame_free(&s->cur);
     av_frame_free(&s->next);
 }

 static int config_out_props(AVFilterLink *outlink)
 {
     AVFilterContext *ctx = outlink->src;
     AVFilterLink *inlink = outlink->src->inputs[0];
     InterlaceContext *s = ctx->priv;

     if (inlink->h < 2) {
         av_log(ctx, AV_LOG_ERROR, "input video height is too small\n");
         return AVERROR_INVALIDDATA;
     }

     if (!s->lowpass)
         av_log(ctx, AV_LOG_WARNING, "Lowpass filter is disabled, "
                "the resulting video will be aliased rather than interlaced.\n");

     // same input size
     outlink->w = inlink->w;
     outlink->h = inlink->h;
     outlink->time_base = inlink->time_base;
     outlink->frame_rate = inlink->frame_rate;
     // half framerate
     outlink->time_base.num *= 2;
     outlink->frame_rate.den *= 2;


     if (s->lowpass) {
         s->lowpass_line = lowpass_line_c;
         if (ARCH_X86)
             ff_interlace_init_x86(s);
     }

     av_log(ctx, AV_LOG_VERBOSE, "%s interlacing %s lowpass filter\n",
            s->scan == MODE_TFF ? "tff" : "bff", (s->lowpass) ? "with" : "without");

     return 0;
 }

 static void copy_picture_field(InterlaceContext *s,
                                AVFrame *src_frame, AVFrame *dst_frame,
                                AVFilterLink *inlink, enum FieldType field_type,
                                int lowpass)
 {
     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
     int hsub = desc->log2_chroma_w;
     int vsub = desc->log2_chroma_h;
     int plane, j;

     for (plane = 0; plane < desc->nb_components; plane++) {
         int cols  = (plane == 1 || plane == 2) ? -(-inlink->w) >> hsub : inlink->w;
         int lines = (plane == 1 || plane == 2) ? AV_CEIL_RSHIFT(inlink->h, vsub) : inlink->h;
         uint8_t *dstp = dst_frame->data[plane];
         const uint8_t *srcp = src_frame->data[plane];

         av_assert0(cols >= 0 || lines >= 0);

         lines = (lines + (field_type == FIELD_UPPER)) / 2;
         if (field_type == FIELD_LOWER) {
             srcp += src_frame->linesize[plane];
             dstp += dst_frame->linesize[plane];
         }
         if (lowpass) {
             int srcp_linesize = src_frame->linesize[plane] * 2;
             int dstp_linesize = dst_frame->linesize[plane] * 2;
             for (j = lines; j > 0; j--) {
                 const uint8_t *srcp_above = srcp - src_frame->linesize[plane];
                 const uint8_t *srcp_below = srcp + src_frame->linesize[plane];
                 if (j == lines)
                     srcp_above = srcp; // there is no line above
                 if (j == 1)
                     srcp_below = srcp; // there is no line below
                 s->lowpass_line(dstp, cols, srcp, srcp_above, srcp_below);
                 dstp += dstp_linesize;
                 srcp += srcp_linesize;
             }
         } else {
             av_image_copy_plane(dstp, dst_frame->linesize[plane] * 2,
                                 srcp, src_frame->linesize[plane] * 2,
                                 cols, lines);
         }
     }
 }

 static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
 {
     AVFilterContext *ctx = inlink->dst;
     AVFilterLink *outlink = ctx->outputs[0];
     InterlaceContext *s = ctx->priv;
     AVFrame *out;
     int tff, ret;

     av_frame_free(&s->cur);
     s->cur  = s->next;
     s->next = buf;

     /* we need at least two frames */
     if (!s->cur || !s->next)
         return 0;

     if (s->cur->interlaced_frame) {
         av_log(ctx, AV_LOG_WARNING,
                "video is already interlaced, adjusting framerate only\n");
         out = av_frame_clone(s->cur);
         if (!out)
             return AVERROR(ENOMEM);
         out->pts /= 2;  // adjust pts to new framerate
         ret = ff_filter_frame(outlink, out);
         return ret;
     }

     tff = (s->scan == MODE_TFF);
     out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
     if (!out)
         return AVERROR(ENOMEM);

     av_frame_copy_props(out, s->cur);
     out->interlaced_frame = 1;
     out->top_field_first  = tff;
     out->pts             /= 2;  // adjust pts to new framerate

     /* copy upper/lower field from cur */
     copy_picture_field(s, s->cur, out, inlink, tff ? FIELD_UPPER : FIELD_LOWER, s->lowpass);
     av_frame_free(&s->cur);

     /* copy lower/upper field from next */
     copy_picture_field(s, s->next, out, inlink, tff ? FIELD_LOWER : FIELD_UPPER, s->lowpass);
     av_frame_free(&s->next);

     ret = ff_filter_frame(outlink, out);

     return ret;
 }

 static const AVFilterPad inputs[] = {
     {
         .name         = "default",
         .type         = AVMEDIA_TYPE_VIDEO,
         .filter_frame = filter_frame,
     },
     { NULL }
 };

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

 AVFilter ff_vf_interlace = {
     .name          = "interlace",
     .description   = NULL_IF_CONFIG_SMALL("Convert progressive video into interlaced."),
     .uninit        = uninit,
     .priv_class    = &interlace_class,
     .priv_size     = sizeof(InterlaceContext),
     .query_formats = query_formats,
     .inputs        = inputs,
     .outputs       = outputs,
 };
	/*
	* Copyright (c) 2003 Michael Zucchi <notzed@ximian.com>
	* Copyright (c) 2010 Baptiste Coudurier
	* Copyright (c) 2011 Stefano Sabatini
	* Copyright (c) 2013 Vittorio Giovara <vittorio.giovara@gmail.com>
	*
	* 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.
	*/

	/**
	* @file
	* progressive to interlaced content filter, inspired by heavy debugging of tinterlace filter
	*/

	#include "libavutil/common.h"
	#include "libavutil/opt.h"
	#include "libavutil/imgutils.h"
	#include "libavutil/avassert.h"

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

	#define OFFSET(x) offsetof(InterlaceContext, x)
	#define FLAGS AV_OPT_FLAG_FILTERING_PARAM\|AV_OPT_FLAG_VIDEO_PARAM
	static const AVOption interlace_options[] = {
	{ "scan", "scanning mode", OFFSET(scan),
	AV_OPT_TYPE_INT, {.i64 = MODE_TFF }, 0, 1, .flags = FLAGS, .unit = "scan" },
	{ "tff", "top field first", 0,
	AV_OPT_TYPE_CONST, {.i64 = MODE_TFF }, INT_MIN, INT_MAX, .flags = FLAGS, .unit = "scan" },
	{ "bff", "bottom field first", 0,
	AV_OPT_TYPE_CONST, {.i64 = MODE_BFF }, INT_MIN, INT_MAX, .flags = FLAGS, .unit = "scan" },
	{ "lowpass", "set vertical low-pass filter", OFFSET(lowpass),
	AV_OPT_TYPE_BOOL, {.i64 = 1 }, 0, 1, .flags = FLAGS },
	{ NULL }
	};

	AVFILTER_DEFINE_CLASS(interlace);

	static void lowpass_line_c(uint8_t *dstp, ptrdiff_t linesize,
	const uint8_t *srcp,
	const uint8_t *srcp_above,
	const uint8_t *srcp_below)
	{
	int i;
	for (i = 0; i < linesize; i++) {
	// this calculation is an integer representation of
	// '0.5 * current + 0.25 * above + 0.25 * below'
	// '1 +' is for rounding.
	dstp[i] = (1 + srcp[i] + srcp[i] + srcp_above[i] + srcp_below[i]) >> 2;
	}
	}

	static const enum AVPixelFormat formats_supported[] = {
	AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P,
	AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUVA420P,
	AV_PIX_FMT_GRAY8, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
	AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_NONE
	};

	static int query_formats(AVFilterContext *ctx)
	{
	AVFilterFormats *fmts_list = ff_make_format_list(formats_supported);
	if (!fmts_list)
	return AVERROR(ENOMEM);
	return ff_set_common_formats(ctx, fmts_list);
	}

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

	av_frame_free(&s->cur);
	av_frame_free(&s->next);
	}

	static int config_out_props(AVFilterLink *outlink)
	{
	AVFilterContext *ctx = outlink->src;
	AVFilterLink *inlink = outlink->src->inputs[0];
	InterlaceContext *s = ctx->priv;

	if (inlink->h < 2) {
	av_log(ctx, AV_LOG_ERROR, "input video height is too small\n");
	return AVERROR_INVALIDDATA;
	}

	if (!s->lowpass)
	av_log(ctx, AV_LOG_WARNING, "Lowpass filter is disabled, "
	"the resulting video will be aliased rather than interlaced.\n");

	// same input size
	outlink->w = inlink->w;
	outlink->h = inlink->h;
	outlink->time_base = inlink->time_base;
	outlink->frame_rate = inlink->frame_rate;
	// half framerate
	outlink->time_base.num *= 2;
	outlink->frame_rate.den *= 2;


	if (s->lowpass) {
	s->lowpass_line = lowpass_line_c;
	if (ARCH_X86)
	ff_interlace_init_x86(s);
	}

	av_log(ctx, AV_LOG_VERBOSE, "%s interlacing %s lowpass filter\n",
	s->scan == MODE_TFF ? "tff" : "bff", (s->lowpass) ? "with" : "without");

	return 0;
	}

	static void copy_picture_field(InterlaceContext *s,
	AVFrame src_frame, AVFrame dst_frame,
	AVFilterLink *inlink, enum FieldType field_type,
	int lowpass)
	{
	const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
	int hsub = desc->log2_chroma_w;
	int vsub = desc->log2_chroma_h;
	int plane, j;

	for (plane = 0; plane < desc->nb_components; plane++) {
	int cols = (plane == 1 \|\| plane == 2) ? -(-inlink->w) >> hsub : inlink->w;
	int lines = (plane == 1 \|\| plane == 2) ? AV_CEIL_RSHIFT(inlink->h, vsub) : inlink->h;
	uint8_t *dstp = dst_frame->data[plane];
	const uint8_t *srcp = src_frame->data[plane];

	av_assert0(cols >= 0 \|\| lines >= 0);

	lines = (lines + (field_type == FIELD_UPPER)) / 2;
	if (field_type == FIELD_LOWER) {
	srcp += src_frame->linesize[plane];
	dstp += dst_frame->linesize[plane];
	}
	if (lowpass) {
	int srcp_linesize = src_frame->linesize[plane] * 2;
	int dstp_linesize = dst_frame->linesize[plane] * 2;
	for (j = lines; j > 0; j--) {
	const uint8_t *srcp_above = srcp - src_frame->linesize[plane];
	const uint8_t *srcp_below = srcp + src_frame->linesize[plane];
	if (j == lines)
	srcp_above = srcp; // there is no line above
	if (j == 1)
	srcp_below = srcp; // there is no line below
	s->lowpass_line(dstp, cols, srcp, srcp_above, srcp_below);
	dstp += dstp_linesize;
	srcp += srcp_linesize;
	}
	} else {
	av_image_copy_plane(dstp, dst_frame->linesize[plane] * 2,
	srcp, src_frame->linesize[plane] * 2,
	cols, lines);
	}
	}
	}

	static int filter_frame(AVFilterLink inlink, AVFrame buf)
	{
	AVFilterContext *ctx = inlink->dst;
	AVFilterLink *outlink = ctx->outputs[0];
	InterlaceContext *s = ctx->priv;
	AVFrame *out;
	int tff, ret;

	av_frame_free(&s->cur);
	s->cur = s->next;
	s->next = buf;

	/* we need at least two frames */
	if (!s->cur \|\| !s->next)
	return 0;

	if (s->cur->interlaced_frame) {
	av_log(ctx, AV_LOG_WARNING,
	"video is already interlaced, adjusting framerate only\n");
	out = av_frame_clone(s->cur);
	if (!out)
	return AVERROR(ENOMEM);
	out->pts /= 2; // adjust pts to new framerate
	ret = ff_filter_frame(outlink, out);
	return ret;
	}

	tff = (s->scan == MODE_TFF);
	out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
	if (!out)
	return AVERROR(ENOMEM);

	av_frame_copy_props(out, s->cur);
	out->interlaced_frame = 1;
	out->top_field_first = tff;
	out->pts /= 2; // adjust pts to new framerate

	/* copy upper/lower field from cur */
	copy_picture_field(s, s->cur, out, inlink, tff ? FIELD_UPPER : FIELD_LOWER, s->lowpass);
	av_frame_free(&s->cur);

	/* copy lower/upper field from next */
	copy_picture_field(s, s->next, out, inlink, tff ? FIELD_LOWER : FIELD_UPPER, s->lowpass);
	av_frame_free(&s->next);

	ret = ff_filter_frame(outlink, out);

	return ret;
	}

	static const AVFilterPad inputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_VIDEO,
	.filter_frame = filter_frame,
	},
	{ NULL }
	};

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

	AVFilter ff_vf_interlace = {
	.name = "interlace",
	.description = NULL_IF_CONFIG_SMALL("Convert progressive video into interlaced."),
	.uninit = uninit,
	.priv_class = &interlace_class,
	.priv_size = sizeof(InterlaceContext),
	.query_formats = query_formats,
	.inputs = inputs,
	.outputs = outputs,
	};