/* * Copyright (c) 2011 Mark Himsley * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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 #include #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, .rej_perms = AV_PERM_REUSE2 | AV_PERM_PRESERVE, }, { 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, };