diff options
Diffstat (limited to 'libavfilter/vf_weave.c')
| -rw-r--r-- | libavfilter/vf_weave.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/libavfilter/vf_weave.c b/libavfilter/vf_weave.c new file mode 100644 index 0000000000..037f5d1cf2 --- /dev/null +++ b/libavfilter/vf_weave.c @@ -0,0 +1,192 @@ +/* + * 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/imgutils.h" +#include "libavutil/opt.h" +#include "libavutil/pixdesc.h" +#include "avfilter.h" +#include "internal.h" + +typedef struct WeaveContext { + const AVClass *class; + int first_field; + int double_weave; + int nb_planes; + int planeheight[4]; + int linesize[4]; + + AVFrame *prev; +} WeaveContext; + +#define OFFSET(x) offsetof(WeaveContext, x) +#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM + +static const AVOption weave_options[] = { + { "first_field", "set first field", OFFSET(first_field), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "field"}, + { "top", "set top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"}, + { "t", "set top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"}, + { "bottom", "set bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"}, + { "b", "set bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"}, + { NULL } +}; + +AVFILTER_DEFINE_CLASS(weave); + +static int config_props_output(AVFilterLink *outlink) +{ + AVFilterContext *ctx = outlink->src; + WeaveContext *s = ctx->priv; + AVFilterLink *inlink = ctx->inputs[0]; + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); + int ret; + + if (!s->double_weave) { + outlink->time_base.num = inlink->time_base.num * 2; + outlink->time_base.den = inlink->time_base.den; + outlink->frame_rate.num = inlink->frame_rate.num; + outlink->frame_rate.den = inlink->frame_rate.den * 2; + } + outlink->w = inlink->w; + outlink->h = inlink->h * 2; + + if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0) + return ret; + + s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h); + s->planeheight[0] = s->planeheight[3] = inlink->h; + + s->nb_planes = av_pix_fmt_count_planes(inlink->format); + + return 0; +} + +static int filter_frame(AVFilterLink *inlink, AVFrame *in) +{ + AVFilterContext *ctx = inlink->dst; + WeaveContext *s = ctx->priv; + AVFilterLink *outlink = ctx->outputs[0]; + AVFrame *out; + int i; + + if (!s->prev) { + s->prev = in; + return 0; + } + + out = ff_get_video_buffer(outlink, outlink->w, outlink->h); + if (!out) { + av_frame_free(&in); + av_frame_free(&s->prev); + return AVERROR(ENOMEM); + } + av_frame_copy_props(out, in); + + for (i = 0; i < s->nb_planes; i++) { + if (s->double_weave && !(inlink->frame_count_out & 1)) { + av_image_copy_plane(out->data[i] + out->linesize[i] * s->first_field, + out->linesize[i] * 2, + in->data[i], in->linesize[i], + s->linesize[i], s->planeheight[i]); + av_image_copy_plane(out->data[i] + out->linesize[i] * !s->first_field, + out->linesize[i] * 2, + s->prev->data[i], s->prev->linesize[i], + s->linesize[i], s->planeheight[i]); + } else { + av_image_copy_plane(out->data[i] + out->linesize[i] * !s->first_field, + out->linesize[i] * 2, + in->data[i], in->linesize[i], + s->linesize[i], s->planeheight[i]); + av_image_copy_plane(out->data[i] + out->linesize[i] * s->first_field, + out->linesize[i] * 2, + s->prev->data[i], s->prev->linesize[i], + s->linesize[i], s->planeheight[i]); + } + } + + out->pts = s->double_weave ? s->prev->pts : in->pts / 2; + out->interlaced_frame = 1; + out->top_field_first = !s->first_field; + + if (!s->double_weave) + av_frame_free(&in); + av_frame_free(&s->prev); + if (s->double_weave) + s->prev = in; + return ff_filter_frame(outlink, out); +} + +static av_cold void uninit(AVFilterContext *ctx) +{ + WeaveContext *s = ctx->priv; + + av_frame_free(&s->prev); +} + +static const AVFilterPad weave_inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .filter_frame = filter_frame, + }, + { NULL } +}; + +static const AVFilterPad weave_outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .config_props = config_props_output, + }, + { NULL } +}; + +AVFilter ff_vf_weave = { + .name = "weave", + .description = NULL_IF_CONFIG_SMALL("Weave input video fields into frames."), + .priv_size = sizeof(WeaveContext), + .priv_class = &weave_class, + .uninit = uninit, + .inputs = weave_inputs, + .outputs = weave_outputs, +}; + +static av_cold int init(AVFilterContext *ctx) +{ + WeaveContext *s = ctx->priv; + + if (!strcmp(ctx->filter->name, "doubleweave")) + s->double_weave = 1; + + return 0; +} + +#define doubleweave_options weave_options +AVFILTER_DEFINE_CLASS(doubleweave); + +AVFilter ff_vf_doubleweave = { + .name = "doubleweave", + .description = NULL_IF_CONFIG_SMALL("Weave input video fields into double number of frames."), + .priv_size = sizeof(WeaveContext), + .priv_class = &doubleweave_class, + .init = init, + .uninit = uninit, + .inputs = weave_inputs, + .outputs = weave_outputs, +}; |