diff options
Diffstat (limited to 'libavfilter/vf_separatefields.c')
-rw-r--r-- | libavfilter/vf_separatefields.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/libavfilter/vf_separatefields.c b/libavfilter/vf_separatefields.c new file mode 100644 index 0000000..42ce682 --- /dev/null +++ b/libavfilter/vf_separatefields.c @@ -0,0 +1,146 @@ +/* + * Copyright (c) 2013 Paul B Mahol + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser 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 + */ + +#include "libavutil/pixdesc.h" +#include "avfilter.h" +#include "internal.h" + +typedef struct { + int nb_planes; + AVFrame *second; +} SeparateFieldsContext; + +static int config_props_output(AVFilterLink *outlink) +{ + AVFilterContext *ctx = outlink->src; + SeparateFieldsContext *sf = ctx->priv; + AVFilterLink *inlink = ctx->inputs[0]; + + sf->nb_planes = av_pix_fmt_count_planes(inlink->format); + + if (inlink->h & 1) { + av_log(ctx, AV_LOG_ERROR, "height must be even\n"); + return AVERROR_INVALIDDATA; + } + + outlink->time_base.num = inlink->time_base.num; + outlink->time_base.den = inlink->time_base.den * 2; + outlink->frame_rate.num = inlink->frame_rate.num * 2; + outlink->frame_rate.den = inlink->frame_rate.den; + outlink->w = inlink->w; + outlink->h = inlink->h / 2; + + return 0; +} + +static void extract_field(AVFrame *frame, int nb_planes, int type) +{ + int i; + + for (i = 0; i < nb_planes; i++) { + if (type) + frame->data[i] = frame->data[i] + frame->linesize[i]; + frame->linesize[i] *= 2; + } +} + +static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref) +{ + AVFilterContext *ctx = inlink->dst; + SeparateFieldsContext *sf = ctx->priv; + AVFilterLink *outlink = ctx->outputs[0]; + int ret; + + inpicref->height = outlink->h; + inpicref->interlaced_frame = 0; + + if (!sf->second) { + goto clone; + } else { + AVFrame *second = sf->second; + + extract_field(second, sf->nb_planes, second->top_field_first); + + if (second->pts != AV_NOPTS_VALUE && + inpicref->pts != AV_NOPTS_VALUE) + second->pts += inpicref->pts; + else + second->pts = AV_NOPTS_VALUE; + + ret = ff_filter_frame(outlink, second); + if (ret < 0) + return ret; +clone: + sf->second = av_frame_clone(inpicref); + if (!sf->second) + return AVERROR(ENOMEM); + } + + extract_field(inpicref, sf->nb_planes, !inpicref->top_field_first); + + if (inpicref->pts != AV_NOPTS_VALUE) + inpicref->pts *= 2; + + return ff_filter_frame(outlink, inpicref); +} + +static int request_frame(AVFilterLink *outlink) +{ + AVFilterContext *ctx = outlink->src; + SeparateFieldsContext *sf = ctx->priv; + int ret; + + ret = ff_request_frame(ctx->inputs[0]); + if (ret == AVERROR_EOF && sf->second) { + sf->second->pts *= 2; + extract_field(sf->second, sf->nb_planes, sf->second->top_field_first); + ret = ff_filter_frame(outlink, sf->second); + sf->second = 0; + } + + return ret; +} + +static const AVFilterPad separatefields_inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .filter_frame = filter_frame, + }, + { NULL } +}; + +static const AVFilterPad separatefields_outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .config_props = config_props_output, + .request_frame = request_frame, + }, + { NULL } +}; + +AVFilter ff_vf_separatefields = { + .name = "separatefields", + .description = NULL_IF_CONFIG_SMALL("Split input video frames into fields."), + .priv_size = sizeof(SeparateFieldsContext), + .inputs = separatefields_inputs, + .outputs = separatefields_outputs, +}; |