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182 lines
5.0 KiB
182 lines
5.0 KiB
/* |
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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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#include "libavutil/pixdesc.h" |
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#include "avfilter.h" |
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#include "filters.h" |
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#include "video.h" |
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typedef struct SeparateFieldsContext { |
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int nb_planes; |
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AVFrame *second; |
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} SeparateFieldsContext; |
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static int config_props_output(AVFilterLink *outlink) |
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{ |
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AVFilterContext *ctx = outlink->src; |
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SeparateFieldsContext *s = ctx->priv; |
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AVFilterLink *inlink = ctx->inputs[0]; |
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FilterLink *il = ff_filter_link(inlink); |
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FilterLink *ol = ff_filter_link(outlink); |
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s->nb_planes = av_pix_fmt_count_planes(inlink->format); |
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if (inlink->h & 1) { |
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av_log(ctx, AV_LOG_ERROR, "height must be even\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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outlink->time_base.num = inlink->time_base.num; |
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outlink->time_base.den = inlink->time_base.den * 2; |
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ol->frame_rate.num = il->frame_rate.num * 2; |
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ol->frame_rate.den = il->frame_rate.den; |
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outlink->w = inlink->w; |
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outlink->h = inlink->h / 2; |
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return 0; |
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} |
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static void extract_field(AVFrame *frame, int nb_planes, int type) |
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{ |
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int i; |
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for (i = 0; i < nb_planes; i++) { |
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if (type) |
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frame->data[i] = frame->data[i] + frame->linesize[i]; |
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frame->linesize[i] *= 2; |
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} |
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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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SeparateFieldsContext *s = ctx->priv; |
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AVFilterLink *outlink = ctx->outputs[0]; |
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int ret; |
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inpicref->height = outlink->h; |
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#if FF_API_INTERLACED_FRAME |
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FF_DISABLE_DEPRECATION_WARNINGS |
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inpicref->interlaced_frame = 0; |
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FF_ENABLE_DEPRECATION_WARNINGS |
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#endif |
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inpicref->flags &= ~AV_FRAME_FLAG_INTERLACED; |
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if (!s->second) { |
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goto clone; |
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} else { |
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AVFrame *second = s->second; |
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extract_field(second, s->nb_planes, !!(second->flags & AV_FRAME_FLAG_TOP_FIELD_FIRST)); |
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if (second->pts != AV_NOPTS_VALUE && |
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inpicref->pts != AV_NOPTS_VALUE) |
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second->pts += inpicref->pts; |
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else |
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second->pts = AV_NOPTS_VALUE; |
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ret = ff_filter_frame(outlink, second); |
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if (ret < 0) |
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return ret; |
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clone: |
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s->second = av_frame_clone(inpicref); |
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if (!s->second) |
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return AVERROR(ENOMEM); |
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} |
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extract_field(inpicref, s->nb_planes, !(inpicref->flags & AV_FRAME_FLAG_TOP_FIELD_FIRST)); |
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if (inpicref->pts != AV_NOPTS_VALUE) |
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inpicref->pts *= 2; |
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return ff_filter_frame(outlink, inpicref); |
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} |
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static int flush_frame(AVFilterLink *outlink, int64_t pts, int64_t *out_pts) |
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{ |
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AVFilterContext *ctx = outlink->src; |
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SeparateFieldsContext *s = ctx->priv; |
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int ret = 0; |
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if (s->second) { |
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*out_pts = s->second->pts += pts; |
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extract_field(s->second, s->nb_planes, !!(s->second->flags & AV_FRAME_FLAG_TOP_FIELD_FIRST)); |
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ret = ff_filter_frame(outlink, s->second); |
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s->second = NULL; |
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} |
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return ret; |
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} |
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static int activate(AVFilterContext *ctx) |
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{ |
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AVFilterLink *inlink = ctx->inputs[0]; |
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AVFilterLink *outlink = ctx->outputs[0]; |
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AVFrame *in; |
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int64_t pts; |
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int ret, status; |
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FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink); |
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ret = ff_inlink_consume_frame(inlink, &in); |
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if (ret < 0) |
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return ret; |
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if (ret > 0) |
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return filter_frame(inlink, in); |
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if (ff_inlink_acknowledge_status(inlink, &status, &pts)) { |
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if (status == AVERROR_EOF) { |
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int64_t out_pts = pts; |
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ret = flush_frame(outlink, pts, &out_pts); |
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ff_outlink_set_status(outlink, status, out_pts); |
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return ret; |
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} |
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} |
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FF_FILTER_FORWARD_WANTED(outlink, inlink); |
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return FFERROR_NOT_READY; |
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} |
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static av_cold void uninit(AVFilterContext *ctx) |
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{ |
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SeparateFieldsContext *s = ctx->priv; |
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av_frame_free(&s->second); |
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} |
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static const AVFilterPad separatefields_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_props_output, |
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}, |
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}; |
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const AVFilter ff_vf_separatefields = { |
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.name = "separatefields", |
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.description = NULL_IF_CONFIG_SMALL("Split input video frames into fields."), |
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.priv_size = sizeof(SeparateFieldsContext), |
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.activate = activate, |
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.uninit = uninit, |
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FILTER_INPUTS(ff_video_default_filterpad), |
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FILTER_OUTPUTS(separatefields_outputs), |
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};
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