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- /*
- * Copyright (c) 2011 Mark Himsley
- *
- * 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
- */
- /**
- * @file
- * video field order filter, heavily influenced by vf_pad.c
- */
- /* #define DEBUG */
- #include <stdio.h>
- #include <string.h>
- #include "libavutil/imgutils.h"
- #include "libavutil/internal.h"
- #include "libavutil/pixdesc.h"
- #include "avfilter.h"
- #include "formats.h"
- #include "internal.h"
- #include "video.h"
- typedef struct
- {
- unsigned int dst_tff; ///< output bff/tff
- int line_size[4]; ///< bytes of pixel data per line for each plane
- } FieldOrderContext;
- static av_cold int init(AVFilterContext *ctx, const char *args)
- {
- FieldOrderContext *fieldorder = ctx->priv;
- const char *tff = "tff";
- const char *bff = "bff";
- if (!args) {
- fieldorder->dst_tff = 1;
- } else if (sscanf(args, "%u", &fieldorder->dst_tff) == 1) {
- fieldorder->dst_tff = !!fieldorder->dst_tff;
- } else if (!strcmp(tff, args)) {
- fieldorder->dst_tff = 1;
- } else if (!strcmp(bff, args)) {
- fieldorder->dst_tff = 0;
- } else {
- av_log(ctx, AV_LOG_ERROR, "Invalid argument '%s'.\n", args);
- return AVERROR(EINVAL);
- }
- av_log(ctx, AV_LOG_VERBOSE, "output field order: %s\n",
- fieldorder->dst_tff ? tff : bff);
- return 0;
- }
- static int query_formats(AVFilterContext *ctx)
- {
- AVFilterFormats *formats;
- enum AVPixelFormat pix_fmt;
- int ret;
- /** accept any input pixel format that is not hardware accelerated, not
- * a bitstream format, and does not have vertically sub-sampled chroma */
- if (ctx->inputs[0]) {
- formats = NULL;
- for (pix_fmt = 0; pix_fmt < AV_PIX_FMT_NB; pix_fmt++) {
- const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
- if (!(desc->flags & PIX_FMT_HWACCEL ||
- desc->flags & PIX_FMT_BITSTREAM) &&
- desc->nb_components && !desc->log2_chroma_h &&
- (ret = ff_add_format(&formats, pix_fmt)) < 0) {
- ff_formats_unref(&formats);
- return ret;
- }
- }
- ff_formats_ref(formats, &ctx->inputs[0]->out_formats);
- ff_formats_ref(formats, &ctx->outputs[0]->in_formats);
- }
- return 0;
- }
- static int config_input(AVFilterLink *inlink)
- {
- AVFilterContext *ctx = inlink->dst;
- FieldOrderContext *fieldorder = ctx->priv;
- int plane;
- /** full an array with the number of bytes that the video
- * data occupies per line for each plane of the input video */
- for (plane = 0; plane < 4; plane++) {
- fieldorder->line_size[plane] = av_image_get_linesize(
- inlink->format,
- inlink->w,
- plane);
- }
- return 0;
- }
- static AVFilterBufferRef *get_video_buffer(AVFilterLink *inlink, int perms, int w, int h)
- {
- AVFilterContext *ctx = inlink->dst;
- AVFilterLink *outlink = ctx->outputs[0];
- return ff_get_video_buffer(outlink, perms, w, h);
- }
- static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *frame)
- {
- AVFilterContext *ctx = inlink->dst;
- FieldOrderContext *s = ctx->priv;
- AVFilterLink *outlink = ctx->outputs[0];
- int h, plane, line_step, line_size, line;
- uint8_t *data;
- if (!frame->video->interlaced ||
- frame->video->top_field_first == s->dst_tff)
- return ff_filter_frame(outlink, frame);
- av_dlog(ctx,
- "picture will move %s one line\n",
- s->dst_tff ? "up" : "down");
- h = frame->video->h;
- for (plane = 0; plane < 4 && frame->data[plane]; plane++) {
- line_step = frame->linesize[plane];
- line_size = s->line_size[plane];
- data = frame->data[plane];
- if (s->dst_tff) {
- /** Move every line up one line, working from
- * the top to the bottom of the frame.
- * The original top line is lost.
- * The new last line is created as a copy of the
- * penultimate line from that field. */
- for (line = 0; line < h; line++) {
- if (1 + line < frame->video->h) {
- memcpy(data, data + line_step, line_size);
- } else {
- memcpy(data, data - line_step - line_step, line_size);
- }
- data += line_step;
- }
- } else {
- /** Move every line down one line, working from
- * the bottom to the top of the frame.
- * The original bottom line is lost.
- * The new first line is created as a copy of the
- * second line from that field. */
- data += (h - 1) * line_step;
- for (line = h - 1; line >= 0 ; line--) {
- if (line > 0) {
- memcpy(data, data - line_step, line_size);
- } else {
- memcpy(data, data + line_step + line_step, line_size);
- }
- data -= line_step;
- }
- }
- }
- frame->video->top_field_first = s->dst_tff;
- return ff_filter_frame(outlink, frame);
- }
- static const AVFilterPad avfilter_vf_fieldorder_inputs[] = {
- {
- .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .config_props = config_input,
- .get_video_buffer = get_video_buffer,
- .filter_frame = filter_frame,
- .min_perms = AV_PERM_READ | AV_PERM_WRITE,
- },
- { NULL }
- };
- static const AVFilterPad avfilter_vf_fieldorder_outputs[] = {
- {
- .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- },
- { NULL }
- };
- AVFilter avfilter_vf_fieldorder = {
- .name = "fieldorder",
- .description = NULL_IF_CONFIG_SMALL("Set the field order."),
- .init = init,
- .priv_size = sizeof(FieldOrderContext),
- .query_formats = query_formats,
- .inputs = avfilter_vf_fieldorder_inputs,
- .outputs = avfilter_vf_fieldorder_outputs,
- };
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