2015-03-27 14:06:05 +00:00
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/*
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* Copyright (c) 2015 Himangi Saraogi <himangi774@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
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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 detelecine filter.
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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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int start_frame;
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unsigned int pattern_pos;
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unsigned int nskip_fields;
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int64_t start_time;
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AVRational pts;
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AVRational ts_unit;
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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;
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AVFrame *temp;
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} DetelecineContext;
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#define OFFSET(x) offsetof(DetelecineContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption detelecine_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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{"start_frame", "position of first frame with respect to the pattern if stream is cut", OFFSET(start_frame), AV_OPT_TYPE_INT, {.i64=0}, 0, 13, FLAGS},
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{NULL}
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};
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AVFILTER_DEFINE_CLASS(detelecine);
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static av_cold int init(AVFilterContext *ctx)
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{
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DetelecineContext *s = ctx->priv;
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const char *p;
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int max = 0;
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if (!strlen(s->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 = s->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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s->pts.num += *p - '0';
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s->pts.den += 2;
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}
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s->nskip_fields = 0;
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s->pattern_pos = 0;
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s->start_time = AV_NOPTS_VALUE;
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if (s->start_frame != 0) {
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int nfields = 0;
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for (p = s->pattern; *p; p++) {
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nfields += *p - '0';
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s->pattern_pos++;
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if (nfields >= 2*s->start_frame) {
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s->nskip_fields = nfields - 2*s->start_frame;
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break;
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}
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}
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}
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av_log(ctx, AV_LOG_INFO, "Detelecine pattern %s removes up to %d frames per frame, pts advance factor: %d/%d\n",
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s->pattern, (max + 1) / 2, s->pts.num, s->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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2015-10-05 03:39:25 +00:00
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int fmt, ret;
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2015-03-27 14:06:05 +00:00
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for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
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if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
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desc->flags & AV_PIX_FMT_FLAG_PAL ||
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2015-10-05 03:39:25 +00:00
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desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) &&
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(ret = ff_add_format(&pix_fmts, fmt)) < 0)
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return ret;
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2015-03-27 14:06:05 +00:00
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}
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2015-04-03 17:55:18 +00:00
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return ff_set_common_formats(ctx, pix_fmts);
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2015-03-27 14:06:05 +00:00
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}
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static int config_input(AVFilterLink *inlink)
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{
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DetelecineContext *s = inlink->dst->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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int ret;
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s->temp = ff_get_video_buffer(inlink, inlink->w, inlink->h);
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if (!s->temp)
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return AVERROR(ENOMEM);
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s->frame = ff_get_video_buffer(inlink, inlink->w, inlink->h);
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if (!s->frame)
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return AVERROR(ENOMEM);
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if ((ret = av_image_fill_linesizes(s->stride, inlink->format, inlink->w)) < 0)
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return ret;
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2016-01-27 15:19:38 +00:00
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s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
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2015-03-27 14:06:05 +00:00
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s->planeheight[0] = s->planeheight[3] = inlink->h;
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s->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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DetelecineContext *s = 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(s->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->frame_rate = fps;
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outlink->time_base = av_mul_q(inlink->time_base, s->pts);
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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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s->ts_unit = 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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DetelecineContext *s = ctx->priv;
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int i, len = 0, ret = 0, out = 0;
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if (s->start_time == AV_NOPTS_VALUE)
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s->start_time = inpicref->pts;
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if (s->nskip_fields >= 2) {
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s->nskip_fields -= 2;
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return 0;
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} else if (s->nskip_fields >= 1) {
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if (s->occupied) {
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s->occupied = 0;
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s->nskip_fields--;
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}
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else {
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for (i = 0; i < s->nb_planes; i++) {
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av_image_copy_plane(s->temp->data[i], s->temp->linesize[i],
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inpicref->data[i], inpicref->linesize[i],
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s->stride[i],
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s->planeheight[i]);
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}
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s->occupied = 1;
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s->nskip_fields--;
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return 0;
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}
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}
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if (s->nskip_fields == 0) {
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while(!len && s->pattern[s->pattern_pos]) {
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len = s->pattern[s->pattern_pos] - '0';
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s->pattern_pos++;
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}
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if (!s->pattern[s->pattern_pos])
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s->pattern_pos = 0;
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if(!len) { // do not output any field as the entire pattern is zero
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av_frame_free(&inpicref);
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return 0;
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}
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if (s->occupied) {
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for (i = 0; i < s->nb_planes; i++) {
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// fill in the EARLIER field from the new pic
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av_image_copy_plane(s->frame->data[i] + s->frame->linesize[i] * s->first_field,
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s->frame->linesize[i] * 2,
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inpicref->data[i] + inpicref->linesize[i] * s->first_field,
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inpicref->linesize[i] * 2,
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s->stride[i],
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(s->planeheight[i] - s->first_field + 1) / 2);
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// fill in the LATER field from the buffered pic
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av_image_copy_plane(s->frame->data[i] + s->frame->linesize[i] * !s->first_field,
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s->frame->linesize[i] * 2,
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s->temp->data[i] + s->temp->linesize[i] * !s->first_field,
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s->temp->linesize[i] * 2,
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s->stride[i],
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(s->planeheight[i] - !s->first_field + 1) / 2);
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}
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len -= 2;
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for (i = 0; i < s->nb_planes; i++) {
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av_image_copy_plane(s->temp->data[i], s->temp->linesize[i],
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inpicref->data[i], inpicref->linesize[i],
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s->stride[i],
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s->planeheight[i]);
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}
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s->occupied = 1;
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out = 1;
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} else {
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if (len >= 2) {
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// output THIS image as-is
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for (i = 0; i < s->nb_planes; i++)
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av_image_copy_plane(s->frame->data[i], s->frame->linesize[i],
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inpicref->data[i], inpicref->linesize[i],
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s->stride[i],
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s->planeheight[i]);
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len -= 2;
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out = 1;
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} else if (len == 1) {
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// fill in the EARLIER field from the new pic
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2015-03-31 07:13:46 +00:00
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for (i = 0; i < s->nb_planes; i++) {
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av_image_copy_plane(s->frame->data[i] +
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s->frame->linesize[i] * s->first_field,
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s->frame->linesize[i] * 2,
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inpicref->data[i] +
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inpicref->linesize[i] * s->first_field,
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inpicref->linesize[i] * 2, s->stride[i],
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(s->planeheight[i] - s->first_field + 1) / 2);
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}
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2015-03-27 14:06:05 +00:00
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// TODO: not sure about the other field
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len--;
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out = 1;
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}
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}
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if (len == 1 && s->occupied)
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{
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len--;
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s->occupied = 0;
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}
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}
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s->nskip_fields = len;
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if (out) {
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AVFrame *frame = av_frame_clone(s->frame);
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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 = ((s->start_time == AV_NOPTS_VALUE) ? 0 : s->start_time) +
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av_rescale(outlink->frame_count, s->ts_unit.num,
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s->ts_unit.den);
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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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DetelecineContext *s = ctx->priv;
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av_frame_free(&s->temp);
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av_frame_free(&s->frame);
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}
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static const AVFilterPad detelecine_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 detelecine_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 ff_vf_detelecine = {
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.name = "detelecine",
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.description = NULL_IF_CONFIG_SMALL("Apply an inverse telecine pattern."),
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.priv_size = sizeof(DetelecineContext),
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.priv_class = &detelecine_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 = detelecine_inputs,
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.outputs = detelecine_outputs,
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};
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