| /* |
| * 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 "libavutil/imgutils.h" |
| #include "libavutil/pixdesc.h" |
| #include "avfilter.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, void *opaque) |
| { |
| 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_INFO, "output field order: %s\n", |
| fieldorder->dst_tff ? tff : bff); |
| |
| return 0; |
| } |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| AVFilterFormats *formats; |
| enum PixelFormat 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 < PIX_FMT_NB; pix_fmt++) |
| if (!( av_pix_fmt_descriptors[pix_fmt].flags & PIX_FMT_HWACCEL |
| || av_pix_fmt_descriptors[pix_fmt].flags & PIX_FMT_BITSTREAM) |
| && av_pix_fmt_descriptors[pix_fmt].nb_components |
| && !av_pix_fmt_descriptors[pix_fmt].log2_chroma_h |
| && (ret = avfilter_add_format(&formats, pix_fmt)) < 0) { |
| avfilter_formats_unref(&formats); |
| return ret; |
| } |
| avfilter_formats_ref(formats, &ctx->inputs[0]->out_formats); |
| avfilter_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 avfilter_get_video_buffer(outlink, perms, w, h); |
| } |
| |
| static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| |
| AVFilterBufferRef *outpicref; |
| |
| outpicref = avfilter_ref_buffer(inpicref, ~0); |
| outlink->out_buf = outpicref; |
| |
| avfilter_start_frame(outlink, outpicref); |
| } |
| |
| static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| FieldOrderContext *fieldorder = ctx->priv; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| |
| AVFilterBufferRef *inpicref = inlink->cur_buf; |
| |
| /** can only currently do slices if this filter is doing nothing |
| * because this filter is moving picture content, the output |
| * slice will contain different video lines than the input slice |
| * and that complexity will be added later */ |
| if ( !inpicref->video->interlaced |
| || inpicref->video->top_field_first == fieldorder->dst_tff) { |
| avfilter_draw_slice(outlink, y, h, slice_dir); |
| } |
| } |
| |
| static void end_frame(AVFilterLink *inlink) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| FieldOrderContext *fieldorder = ctx->priv; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| |
| AVFilterBufferRef *inpicref = inlink->cur_buf; |
| AVFilterBufferRef *outpicref = outlink->out_buf; |
| |
| int h, plane, line_step, line_size, line; |
| uint8_t *cpy_src, *cpy_dst; |
| |
| if ( inpicref->video->interlaced |
| && inpicref->video->top_field_first != fieldorder->dst_tff) { |
| av_dlog(ctx, |
| "picture will move %s one line\n", |
| fieldorder->dst_tff ? "up" : "down"); |
| h = inpicref->video->h; |
| for (plane = 0; plane < 4 && inpicref->data[plane]; plane++) { |
| line_step = inpicref->linesize[plane]; |
| line_size = fieldorder->line_size[plane]; |
| cpy_src = inpicref->data[plane]; |
| cpy_dst = outpicref->data[plane]; |
| if (fieldorder->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 < outpicref->video->h) { |
| memcpy(cpy_dst, cpy_src + line_step, line_size); |
| } else { |
| memcpy(cpy_dst, cpy_src - line_step - line_step, line_size); |
| } |
| cpy_src += line_step; |
| cpy_dst += 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. */ |
| cpy_src += (h - 1) * line_step; |
| cpy_dst += (h - 1) * line_step; |
| for (line = h - 1; line >= 0 ; line--) { |
| if (line > 0) { |
| memcpy(cpy_dst, cpy_src - line_step, line_size); |
| } else { |
| memcpy(cpy_dst, cpy_src + line_step + line_step, line_size); |
| } |
| cpy_src -= line_step; |
| cpy_dst -= line_step; |
| } |
| } |
| } |
| outpicref->video->top_field_first = fieldorder->dst_tff; |
| avfilter_draw_slice(outlink, 0, h, 1); |
| } else { |
| av_dlog(ctx, |
| "not interlaced or field order already correct\n"); |
| } |
| |
| avfilter_end_frame(outlink); |
| avfilter_unref_buffer(inpicref); |
| } |
| |
| 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 = (AVFilterPad[]) {{ .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = config_input, |
| .start_frame = start_frame, |
| .get_video_buffer = get_video_buffer, |
| .draw_slice = draw_slice, |
| .end_frame = end_frame, |
| .min_perms = AV_PERM_READ, |
| .rej_perms = AV_PERM_REUSE2|AV_PERM_PRESERVE,}, |
| { .name = NULL}}, |
| .outputs = (AVFilterPad[]) {{ .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, }, |
| { .name = NULL}}, |
| }; |
