mirror of https://github.com/FFmpeg/FFmpeg.git
* qatar/master: FATE: add a test for the interlace filter lavfi: new interlace filter Conflicts: Changelog configure doc/filters.texi libavfilter/Makefile libavfilter/allfilters.c tests/fate/filter.mak Merged-by: Michael Niedermayer <michaelni@gmx.at>pull/21/head
Michael Niedermayer
12 years ago
commit
ebbd4fd5f0
8 changed files with 320 additions and 0 deletions
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/*
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* Copyright (c) 2003 Michael Zucchi <notzed@ximian.com> |
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* Copyright (c) 2010 Baptiste Coudurier |
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* Copyright (c) 2011 Stefano Sabatini |
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* Copyright (c) 2013 Vittorio Giovara <vittorio.giovara@gmail.com> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License along |
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* with FFmpeg; if not, write to the Free Software Foundation, Inc., |
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
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*/ |
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/**
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* @file |
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* progressive to interlaced content filter, inspired by heavy debugging of tinterlace filter |
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*/ |
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#include "libavutil/common.h" |
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#include "libavutil/opt.h" |
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#include "libavutil/imgutils.h" |
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#include "libavutil/avassert.h" |
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#include "formats.h" |
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#include "avfilter.h" |
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#include "internal.h" |
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#include "video.h" |
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enum ScanMode { |
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MODE_TFF = 0, |
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MODE_BFF = 1, |
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}; |
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enum FieldType { |
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FIELD_UPPER = 0, |
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FIELD_LOWER = 1, |
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}; |
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typedef struct { |
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const AVClass *class; |
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enum ScanMode scan; // top or bottom field first scanning
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int lowpass; // enable or disable low pass filterning
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AVFrame *cur, *next; // the two frames from which the new one is obtained
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int got_output; // signal an output frame is reday to request_frame()
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} InterlaceContext; |
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#define OFFSET(x) offsetof(InterlaceContext, x) |
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#define V AV_OPT_FLAG_VIDEO_PARAM |
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static const AVOption options[] = { |
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{ "scan", "scanning mode", OFFSET(scan), |
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AV_OPT_TYPE_INT, {.i64 = MODE_TFF }, 0, 1, .flags = V, .unit = "scan" }, |
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{ "tff", "top field first", 0, |
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AV_OPT_TYPE_CONST, {.i64 = MODE_TFF }, INT_MIN, INT_MAX, .flags = V, .unit = "scan" }, |
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{ "bff", "bottom field first", 0, |
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AV_OPT_TYPE_CONST, {.i64 = MODE_BFF }, INT_MIN, INT_MAX, .flags = V, .unit = "scan" }, |
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{ "lowpass", "enable vertical low-pass filter", OFFSET(lowpass), |
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AV_OPT_TYPE_INT, {.i64 = 1 }, 0, 1, .flags = V }, |
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{ NULL } |
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}; |
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static const AVClass class = { |
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.class_name = "interlace filter", |
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.item_name = av_default_item_name, |
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.option = options, |
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.version = LIBAVUTIL_VERSION_INT, |
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}; |
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static const enum AVPixelFormat formats_supported[] = { |
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, |
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUVA420P, |
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AV_PIX_FMT_GRAY8, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, |
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AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_NONE |
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}; |
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static int query_formats(AVFilterContext *ctx) |
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{ |
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ff_set_common_formats(ctx, ff_make_format_list(formats_supported)); |
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return 0; |
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} |
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static av_cold void uninit(AVFilterContext *ctx) |
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{ |
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InterlaceContext *s = ctx->priv; |
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av_frame_free(&s->cur); |
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av_frame_free(&s->next); |
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av_opt_free(s); |
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} |
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static int config_out_props(AVFilterLink *outlink) |
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{ |
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AVFilterContext *ctx = outlink->src; |
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AVFilterLink *inlink = outlink->src->inputs[0]; |
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InterlaceContext *s = ctx->priv; |
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if (inlink->h < 2) { |
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av_log(ctx, AV_LOG_ERROR, "input video height is too small\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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// same input size
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outlink->w = inlink->w; |
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outlink->h = inlink->h; |
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outlink->time_base = inlink->time_base; |
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// half framerate
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outlink->time_base.num *= 2; |
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av_log(ctx, AV_LOG_VERBOSE, "%s interlacing %s lowpass filter\n", |
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s->scan == MODE_TFF ? "tff" : "bff", (s->lowpass) ? "with" : "without"); |
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return 0; |
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} |
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static void copy_picture_field(AVFrame *src_frame, AVFrame *dst_frame, |
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AVFilterLink *inlink, enum FieldType field_type, |
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int lowpass) |
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{ |
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
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int vsub = desc->log2_chroma_h; |
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int plane, i, j; |
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for (plane = 0; plane < desc->nb_components; plane++) { |
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int lines = (plane == 1 || plane == 2) ? inlink->h >> vsub : inlink->h; |
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int linesize = av_image_get_linesize(inlink->format, inlink->w, plane); |
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uint8_t *dstp = dst_frame->data[plane]; |
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const uint8_t *srcp = src_frame->data[plane]; |
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av_assert0(linesize >= 0); |
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lines /= 2; |
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if (field_type == FIELD_LOWER) |
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srcp += src_frame->linesize[plane]; |
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if (field_type == FIELD_LOWER) |
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dstp += dst_frame->linesize[plane]; |
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if (lowpass) { |
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int srcp_linesize = src_frame->linesize[plane] * 2; |
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int dstp_linesize = dst_frame->linesize[plane] * 2; |
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for (j = lines; j > 0; j--) { |
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const uint8_t *srcp_above = srcp - src_frame->linesize[plane]; |
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const uint8_t *srcp_below = srcp + src_frame->linesize[plane]; |
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if (j == lines) |
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srcp_above = srcp; // there is no line above
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if (j == 1) |
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srcp_below = srcp; // there is no line below
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for (i = 0; i < linesize; i++) { |
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// this calculation is an integer representation of
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// '0.5 * current + 0.25 * above + 0.25 + below'
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// '1 +' is for rounding.
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dstp[i] = (1 + srcp[i] + srcp[i] + srcp_above[i] + srcp_below[i]) >> 2; |
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} |
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dstp += dstp_linesize; |
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srcp += srcp_linesize; |
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} |
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} else { |
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av_image_copy_plane(dstp, dst_frame->linesize[plane] * 2, |
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srcp, src_frame->linesize[plane] * 2, |
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linesize, lines); |
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} |
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} |
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} |
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static int filter_frame(AVFilterLink *inlink, AVFrame *buf) |
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{ |
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AVFilterContext *ctx = inlink->dst; |
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AVFilterLink *outlink = ctx->outputs[0]; |
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InterlaceContext *s = ctx->priv; |
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AVFrame *out; |
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int tff, ret; |
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av_frame_free(&s->cur); |
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s->cur = s->next; |
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s->next = buf; |
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/* we need at least two frames */ |
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if (!s->cur || !s->next) |
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return 0; |
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tff = (s->scan == MODE_TFF); |
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
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if (!out) |
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return AVERROR(ENOMEM); |
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av_frame_copy_props(out, s->cur); |
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out->interlaced_frame = 1; |
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out->top_field_first = tff; |
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out->pts /= 2; // adjust pts to new framerate
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/* copy upper/lower field from cur */ |
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copy_picture_field(s->cur, out, inlink, tff ? FIELD_UPPER : FIELD_LOWER, s->lowpass); |
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av_frame_free(&s->cur); |
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/* copy lower/upper field from next */ |
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copy_picture_field(s->next, out, inlink, tff ? FIELD_LOWER : FIELD_UPPER, s->lowpass); |
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av_frame_free(&s->next); |
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ret = ff_filter_frame(outlink, out); |
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s->got_output = 1; |
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return ret; |
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} |
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static int request_frame(AVFilterLink *outlink) |
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{ |
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AVFilterContext *ctx = outlink->src; |
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InterlaceContext *s = ctx->priv; |
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int ret = 0; |
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s->got_output = 0; |
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while (ret >= 0 && !s->got_output) |
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ret = ff_request_frame(ctx->inputs[0]); |
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return ret; |
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} |
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static const AVFilterPad inputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.filter_frame = filter_frame, |
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}, |
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{ NULL } |
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}; |
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static const AVFilterPad outputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.config_props = config_out_props, |
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.request_frame = request_frame, |
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}, |
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{ NULL } |
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}; |
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AVFilter avfilter_vf_interlace = { |
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.name = "interlace", |
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.description = NULL_IF_CONFIG_SMALL("Convert progressive video into interlaced."), |
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.uninit = uninit, |
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.priv_class = &class, |
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.priv_size = sizeof(InterlaceContext), |
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.query_formats = query_formats, |
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.inputs = inputs, |
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.outputs = outputs, |
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}; |
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@ -0,0 +1,26 @@ |
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#tb 0: 1/25 |
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0, 0, 0, 1, 152064, 0x6077db38 |
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0, 2, 2, 1, 152064, 0x3d4f1b15 |
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0, 4, 4, 1, 152064, 0x447594f6 |
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0, 6, 6, 1, 152064, 0xb6258a38 |
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0, 8, 8, 1, 152064, 0x296abb09 |
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0, 10, 10, 1, 152064, 0x0fad069d |
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0, 12, 12, 1, 152064, 0x92c78c0d |
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0, 14, 14, 1, 152064, 0x645531fd |
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0, 16, 16, 1, 152064, 0xe7652880 |
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0, 18, 18, 1, 152064, 0x496e1151 |
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0, 20, 20, 1, 152064, 0x7f7cfb06 |
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0, 22, 22, 1, 152064, 0x45e9affe |
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0, 24, 24, 1, 152064, 0xaedb2d3a |
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0, 26, 26, 1, 152064, 0x03fd9ae6 |
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0, 28, 28, 1, 152064, 0x2084e84d |
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0, 30, 30, 1, 152064, 0xcf05faf6 |
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0, 32, 32, 1, 152064, 0x84c746c2 |
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0, 34, 34, 1, 152064, 0x898a6321 |
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0, 36, 36, 1, 152064, 0xe12b7fe9 |
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0, 38, 38, 1, 152064, 0x12feb756 |
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0, 40, 40, 1, 152064, 0xd813601a |
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0, 42, 42, 1, 152064, 0xc0f3d385 |
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0, 44, 44, 1, 152064, 0xfca3a63f |
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0, 46, 46, 1, 152064, 0xa0796f44 |
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0, 48, 48, 1, 152064, 0x1d26af11 |
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