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lavfi: add fieldorder filter
Signed-off-by: Stefano Sabatini <stefano.sabatini-lala@poste.it> Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Mark Himsley
Anton Khirnov
parent
68e23c083a
commit
2f84bb4236
@ -90,6 +90,7 @@ version 0.7_beta1:
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- AAC encoding via libvo-aacenc
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- AMR-WB encoding via libvo-amrwbenc
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- xWMA demuxer
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- fieldorder video filter added
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version 0.6:
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@ -386,6 +386,39 @@ fade=in:0:25, fade=out:975:25
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fade=in:5:20
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@end example
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@section fieldorder
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Transform the field order of the input video.
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It accepts one parameter which specifies the required field order that
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the input interlaced video will be transformed to. The parameter can
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assume one of the following values:
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@table @option
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@item 0 or bff
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output bottom field first
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@item 1 or tff
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output top field first
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@end table
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Default value is "tff".
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Transformation is achieved by shifting the picture content up or down
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by one line, and filling the remaining line with appropriate picture content.
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This method is consistent with most broadcast field order converters.
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If the input video is not flagged as being interlaced, or it is already
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flagged as being of the required output field order then this filter does
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not alter the incoming video.
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This filter is very useful when converting to or from PAL DV material,
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which is bottom field first.
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For example:
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@example
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./ffmpeg -i in.vob -vf "fieldorder=bff" out.dv
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@end example
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@section fifo
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Buffer input images and send them when they are requested.
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@ -27,6 +27,7 @@ OBJS-$(CONFIG_CROP_FILTER) += vf_crop.o
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OBJS-$(CONFIG_CROPDETECT_FILTER) += vf_cropdetect.o
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OBJS-$(CONFIG_DRAWBOX_FILTER) += vf_drawbox.o
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OBJS-$(CONFIG_FADE_FILTER) += vf_fade.o
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OBJS-$(CONFIG_FIELDORDER_FILTER) += vf_fieldorder.o
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OBJS-$(CONFIG_FIFO_FILTER) += vf_fifo.o
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OBJS-$(CONFIG_FORMAT_FILTER) += vf_format.o
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OBJS-$(CONFIG_FREI0R_FILTER) += vf_frei0r.o
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@ -46,6 +46,7 @@ void avfilter_register_all(void)
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REGISTER_FILTER (CROPDETECT, cropdetect, vf);
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REGISTER_FILTER (DRAWBOX, drawbox, vf);
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REGISTER_FILTER (FADE, fade, vf);
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REGISTER_FILTER (FIELDORDER, fieldorder, vf);
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REGISTER_FILTER (FIFO, fifo, vf);
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REGISTER_FILTER (FORMAT, format, vf);
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REGISTER_FILTER (FREI0R, frei0r, vf);
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@ -26,7 +26,7 @@
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#include "libavutil/samplefmt.h"
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#define LIBAVFILTER_VERSION_MAJOR 2
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#define LIBAVFILTER_VERSION_MINOR 0
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#define LIBAVFILTER_VERSION_MINOR 1
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#define LIBAVFILTER_VERSION_MICRO 0
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#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
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235
libavfilter/vf_fieldorder.c
Normal file
235
libavfilter/vf_fieldorder.c
Normal file
@ -0,0 +1,235 @@
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/*
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* Copyright (c) 2011 Mark Himsley
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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
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* video field order filter, heavily influenced by vf_pad.c
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*/
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/* #define DEBUG */
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#include "libavutil/imgutils.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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typedef struct
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{
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unsigned int dst_tff; ///< output bff/tff
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int line_size[4]; ///< bytes of pixel data per line for each plane
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} FieldOrderContext;
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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FieldOrderContext *fieldorder = ctx->priv;
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const char *tff = "tff";
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const char *bff = "bff";
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if (!args) {
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fieldorder->dst_tff = 1;
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} else if (sscanf(args, "%u", &fieldorder->dst_tff) == 1) {
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fieldorder->dst_tff = !!fieldorder->dst_tff;
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} else if (!strcmp(tff, args)) {
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fieldorder->dst_tff = 1;
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} else if (!strcmp(bff, args)) {
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fieldorder->dst_tff = 0;
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} else {
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av_log(ctx, AV_LOG_ERROR, "Invalid argument '%s'.\n", args);
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return AVERROR(EINVAL);
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}
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av_log(ctx, AV_LOG_INFO, "output field order: %s\n",
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fieldorder->dst_tff ? tff : bff);
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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 *formats;
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enum PixelFormat pix_fmt;
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int ret;
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/** accept any input pixel format that is not hardware accelerated, not
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* a bitstream format, and does not have vertically sub-sampled chroma */
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if (ctx->inputs[0]) {
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formats = NULL;
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for (pix_fmt = 0; pix_fmt < PIX_FMT_NB; pix_fmt++)
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if (!( av_pix_fmt_descriptors[pix_fmt].flags & PIX_FMT_HWACCEL
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|| av_pix_fmt_descriptors[pix_fmt].flags & PIX_FMT_BITSTREAM)
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&& av_pix_fmt_descriptors[pix_fmt].nb_components
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&& !av_pix_fmt_descriptors[pix_fmt].log2_chroma_h
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&& (ret = avfilter_add_format(&formats, pix_fmt)) < 0) {
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avfilter_formats_unref(&formats);
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return ret;
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}
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avfilter_formats_ref(formats, &ctx->inputs[0]->out_formats);
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avfilter_formats_ref(formats, &ctx->outputs[0]->in_formats);
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}
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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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AVFilterContext *ctx = inlink->dst;
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FieldOrderContext *fieldorder = ctx->priv;
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int plane;
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/** full an array with the number of bytes that the video
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* data occupies per line for each plane of the input video */
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for (plane = 0; plane < 4; plane++) {
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fieldorder->line_size[plane] = av_image_get_linesize(
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inlink->format,
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inlink->w,
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plane);
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}
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return 0;
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}
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static AVFilterBufferRef *get_video_buffer(AVFilterLink *inlink, int perms, int w, int h)
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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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return avfilter_get_video_buffer(outlink, perms, w, h);
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}
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static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *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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AVFilterBufferRef *outpicref;
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outpicref = avfilter_ref_buffer(inpicref, ~0);
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outlink->out_buf = outpicref;
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avfilter_start_frame(outlink, outpicref);
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}
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static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
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{
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AVFilterContext *ctx = inlink->dst;
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FieldOrderContext *fieldorder = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
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AVFilterBufferRef *inpicref = inlink->cur_buf;
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/** can only currently do slices if this filter is doing nothing
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* because this filter is moving picture content, the output
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* slice will contain different video lines than the input slice
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* and that complexity will be added later */
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if ( !inpicref->video->interlaced
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|| inpicref->video->top_field_first == fieldorder->dst_tff) {
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avfilter_draw_slice(outlink, y, h, slice_dir);
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}
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}
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static void end_frame(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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FieldOrderContext *fieldorder = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
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AVFilterBufferRef *inpicref = inlink->cur_buf;
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AVFilterBufferRef *outpicref = outlink->out_buf;
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int h, w, plane, line_step, line_size, line;
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uint8_t *cpy_src, *cpy_dst;
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if ( inpicref->video->interlaced
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&& inpicref->video->top_field_first != fieldorder->dst_tff) {
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av_dlog(ctx,
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"picture will move %s one line\n",
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fieldorder->dst_tff ? "up" : "down");
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h = inpicref->video->h;
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w = inpicref->video->w;
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for (plane = 0; plane < 4 && inpicref->data[plane]; plane++) {
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line_step = inpicref->linesize[plane];
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line_size = fieldorder->line_size[plane];
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cpy_src = inpicref->data[plane];
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cpy_dst = outpicref->data[plane];
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if (fieldorder->dst_tff) {
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/** Move every line up one line, working from
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* the top to the bottom of the frame.
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* The original top line is lost.
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* The new last line is created as a copy of the
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* penultimate line from that field. */
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for (line = 0; line < h; line++) {
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if (1 + line < outpicref->video->h) {
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memcpy(cpy_dst, cpy_src + line_step, line_size);
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} else {
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memcpy(cpy_dst, cpy_src - line_step - line_step, line_size);
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}
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cpy_src += line_step;
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cpy_dst += line_step;
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}
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} else {
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/** Move every line down one line, working from
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* the bottom to the top of the frame.
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* The original bottom line is lost.
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* The new first line is created as a copy of the
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* second line from that field. */
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cpy_src += (h - 1) * line_step;
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cpy_dst += (h - 1) * line_step;
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for (line = h - 1; line >= 0 ; line--) {
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if (line > 0) {
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memcpy(cpy_dst, cpy_src - line_step, line_size);
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} else {
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memcpy(cpy_dst, cpy_src + line_step + line_step, line_size);
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}
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cpy_src -= line_step;
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cpy_dst -= line_step;
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}
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}
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}
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outpicref->video->top_field_first = fieldorder->dst_tff;
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avfilter_draw_slice(outlink, 0, h, 1);
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} else {
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av_dlog(ctx,
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"not interlaced or field order already correct\n");
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}
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avfilter_end_frame(outlink);
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avfilter_unref_buffer(inpicref);
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}
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AVFilter avfilter_vf_fieldorder = {
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.name = "fieldorder",
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.description = NULL_IF_CONFIG_SMALL("Set the field order."),
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.init = init,
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.priv_size = sizeof(FieldOrderContext),
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.query_formats = query_formats,
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.inputs = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_input,
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.start_frame = start_frame,
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.get_video_buffer = get_video_buffer,
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.draw_slice = draw_slice,
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.end_frame = end_frame,
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.min_perms = AV_PERM_READ,
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.rej_perms = AV_PERM_REUSE2|AV_PERM_PRESERVE,},
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{ .name = NULL}},
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.outputs = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO, },
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{ .name = NULL}},
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};
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