mirror of https://github.com/FFmpeg/FFmpeg.git
Signed-off-by: Stefano Sabatini <stefano.sabatini-lala@poste.it> Signed-off-by: Anton Khirnov <anton@khirnov.net>pull/2/head
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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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