2013-04-06 15:45:52 +02:00
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/*
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* Copyright (c) 2012 Rudolf Polzer
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* Copyright (c) 2013 Paul B Mahol
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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
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file telecine filter, heavily based from mpv-player:TOOLS/vf_dlopen/telecine.c by
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* Rudolf Polzer.
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*/
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#include "libavutil/avstring.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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typedef struct {
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const AVClass *class;
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int first_field;
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char *pattern;
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unsigned int pattern_pos;
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AVRational pts;
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double ts_unit;
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int out_cnt;
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int occupied;
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int nb_planes;
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int planeheight[4];
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int stride[4];
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AVFrame *frame[5];
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AVFrame *temp;
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} TelecineContext;
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#define OFFSET(x) offsetof(TelecineContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption telecine_options[] = {
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{"first_field", "select first field", OFFSET(first_field), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "field"},
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{"top", "select top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"},
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{"t", "select top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"},
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{"bottom", "select bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"},
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{"b", "select bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"},
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{"pattern", "pattern that describe for how many fields a frame is to be displayed", OFFSET(pattern), AV_OPT_TYPE_STRING, {.str="23"}, 0, 0, FLAGS},
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{NULL}
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};
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AVFILTER_DEFINE_CLASS(telecine);
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2013-04-12 11:13:33 +02:00
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static av_cold int init(AVFilterContext *ctx)
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2013-04-06 15:45:52 +02:00
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{
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TelecineContext *tc = ctx->priv;
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const char *p;
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int max = 0;
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if (!strlen(tc->pattern)) {
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av_log(ctx, AV_LOG_ERROR, "No pattern provided.\n");
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return AVERROR_INVALIDDATA;
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}
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for (p = tc->pattern; *p; p++) {
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if (!av_isdigit(*p)) {
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av_log(ctx, AV_LOG_ERROR, "Provided pattern includes non-numeric characters.\n");
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return AVERROR_INVALIDDATA;
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}
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max = FFMAX(*p - '0', max);
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tc->pts.num += 2;
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tc->pts.den += *p - '0';
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}
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tc->out_cnt = (max + 1) / 2;
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av_log(ctx, AV_LOG_INFO, "Telecine pattern %s yields up to %d frames per frame, pts advance factor: %d/%d\n",
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tc->pattern, tc->out_cnt, tc->pts.num, tc->pts.den);
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return 0;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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AVFilterFormats *pix_fmts = NULL;
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int fmt;
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for (fmt = 0; fmt < AV_PIX_FMT_NB; fmt++) {
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
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if (!(desc->flags & PIX_FMT_HWACCEL))
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ff_add_format(&pix_fmts, fmt);
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}
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ff_set_common_formats(ctx, pix_fmts);
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return 0;
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}
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static int config_input(AVFilterLink *inlink)
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{
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TelecineContext *tc = inlink->dst->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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int i, ret;
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tc->temp = ff_get_video_buffer(inlink, inlink->w, inlink->h);
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if (!tc->temp)
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return AVERROR(ENOMEM);
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for (i = 0; i < tc->out_cnt; i++) {
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tc->frame[i] = ff_get_video_buffer(inlink, inlink->w, inlink->h);
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if (!tc->frame[i])
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return AVERROR(ENOMEM);
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}
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if ((ret = av_image_fill_linesizes(tc->stride, inlink->format, inlink->w)) < 0)
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return ret;
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tc->planeheight[1] = tc->planeheight[2] = inlink->h >> desc->log2_chroma_h;
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tc->planeheight[0] = tc->planeheight[3] = inlink->h;
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tc->nb_planes = av_pix_fmt_count_planes(inlink->format);
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return 0;
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}
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static int config_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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TelecineContext *tc = ctx->priv;
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const AVFilterLink *inlink = ctx->inputs[0];
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AVRational fps = inlink->frame_rate;
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if (!fps.num || !fps.den) {
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av_log(ctx, AV_LOG_ERROR, "The input needs a constant frame rate; "
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"current rate of %d/%d is invalid\n", fps.num, fps.den);
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return AVERROR(EINVAL);
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}
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fps = av_mul_q(fps, av_inv_q(tc->pts));
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av_log(ctx, AV_LOG_VERBOSE, "FPS: %d/%d -> %d/%d\n",
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inlink->frame_rate.num, inlink->frame_rate.den, fps.num, fps.den);
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outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
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outlink->frame_rate = fps;
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outlink->time_base = av_mul_q(inlink->time_base, tc->pts);
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2013-04-25 18:52:29 +02:00
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av_log(ctx, AV_LOG_VERBOSE, "TB: %d/%d -> %d/%d\n",
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inlink->time_base.num, inlink->time_base.den, outlink->time_base.num, outlink->time_base.den);
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2013-04-06 15:45:52 +02:00
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tc->ts_unit = av_q2d(av_inv_q(av_mul_q(fps, outlink->time_base)));
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
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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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TelecineContext *tc = ctx->priv;
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int i, len, ret = 0, nout = 0;
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len = tc->pattern[tc->pattern_pos] - '0';
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tc->pattern_pos++;
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if (!tc->pattern[tc->pattern_pos])
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tc->pattern_pos = 0;
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if (!len) { // do not output any field from this frame
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av_frame_free(&inpicref);
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return 0;
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}
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if (tc->occupied) {
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for (i = 0; i < tc->nb_planes; i++) {
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// fill in the EARLIER field from the buffered pic
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av_image_copy_plane(tc->frame[nout]->data[i] + tc->frame[nout]->linesize[i] * tc->first_field,
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tc->frame[nout]->linesize[i] * 2,
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tc->temp->data[i] + tc->temp->linesize[i] * tc->first_field,
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tc->temp->linesize[i] * 2,
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tc->stride[i],
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(tc->planeheight[i] - tc->first_field + 1) / 2);
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// fill in the LATER field from the new pic
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av_image_copy_plane(tc->frame[nout]->data[i] + tc->frame[nout]->linesize[i] * !tc->first_field,
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tc->frame[nout]->linesize[i] * 2,
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inpicref->data[i] + inpicref->linesize[i] * !tc->first_field,
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inpicref->linesize[i] * 2,
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tc->stride[i],
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(tc->planeheight[i] - !tc->first_field + 1) / 2);
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}
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nout++;
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len--;
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tc->occupied = 0;
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}
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while (len >= 2) {
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// output THIS image as-is
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for (i = 0; i < tc->nb_planes; i++)
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av_image_copy_plane(tc->frame[nout]->data[i], tc->frame[nout]->linesize[i],
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inpicref->data[i], inpicref->linesize[i],
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tc->stride[i],
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tc->planeheight[i]);
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nout++;
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len -= 2;
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}
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if (len >= 1) {
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// copy THIS image to the buffer, we need it later
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for (i = 0; i < tc->nb_planes; i++)
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av_image_copy_plane(tc->temp->data[i], tc->temp->linesize[i],
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inpicref->data[i], inpicref->linesize[i],
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tc->stride[i],
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tc->planeheight[i]);
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tc->occupied = 1;
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}
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for (i = 0; i < nout; i++) {
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AVFrame *frame = av_frame_clone(tc->frame[i]);
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if (!frame) {
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av_frame_free(&inpicref);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(frame, inpicref);
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frame->pts = outlink->frame_count * tc->ts_unit;
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ret = ff_filter_frame(outlink, frame);
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}
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av_frame_free(&inpicref);
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return ret;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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TelecineContext *tc = ctx->priv;
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int i;
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av_frame_free(&tc->temp);
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for (i = 0; i < tc->out_cnt; i++)
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av_frame_free(&tc->frame[i]);
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}
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static const AVFilterPad telecine_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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.config_props = config_input,
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},
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{ NULL }
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};
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static const AVFilterPad telecine_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_output,
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},
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{ NULL }
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};
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AVFilter avfilter_vf_telecine = {
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.name = "telecine",
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.description = NULL_IF_CONFIG_SMALL("Apply a telecine pattern."),
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.priv_size = sizeof(TelecineContext),
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.priv_class = &telecine_class,
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.init = init,
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = telecine_inputs,
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.outputs = telecine_outputs,
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};
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