1/* 2 * Copyright (c) 2011 Mark Himsley 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21/** 22 * @file 23 * video field order filter, heavily influenced by vf_pad.c 24 */ 25 26#include "libavutil/imgutils.h" 27#include "libavutil/internal.h" 28#include "libavutil/opt.h" 29#include "libavutil/pixdesc.h" 30#include "avfilter.h" 31#include "formats.h" 32#include "internal.h" 33#include "video.h" 34 35typedef struct FieldOrderContext { 36 const AVClass *class; 37 int dst_tff; ///< output bff/tff 38 int line_size[4]; ///< bytes of pixel data per line for each plane 39} FieldOrderContext; 40 41static int query_formats(AVFilterContext *ctx) 42{ 43 AVFilterFormats *formats; 44 enum AVPixelFormat pix_fmt; 45 int ret; 46 47 /** accept any input pixel format that is not hardware accelerated, not 48 * a bitstream format, and does not have vertically sub-sampled chroma */ 49 if (ctx->inputs[0]) { 50 const AVPixFmtDescriptor *desc = NULL; 51 formats = NULL; 52 while ((desc = av_pix_fmt_desc_next(desc))) { 53 pix_fmt = av_pix_fmt_desc_get_id(desc); 54 if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL || 55 desc->flags & AV_PIX_FMT_FLAG_PAL || 56 desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) && 57 desc->nb_components && !desc->log2_chroma_h && 58 (ret = ff_add_format(&formats, pix_fmt)) < 0) { 59 ff_formats_unref(&formats); 60 return ret; 61 } 62 } 63 ff_formats_ref(formats, &ctx->inputs[0]->out_formats); 64 ff_formats_ref(formats, &ctx->outputs[0]->in_formats); 65 } 66 67 return 0; 68} 69 70static int config_input(AVFilterLink *inlink) 71{ 72 AVFilterContext *ctx = inlink->dst; 73 FieldOrderContext *s = ctx->priv; 74 75 return av_image_fill_linesizes(s->line_size, inlink->format, inlink->w); 76} 77 78static int filter_frame(AVFilterLink *inlink, AVFrame *frame) 79{ 80 AVFilterContext *ctx = inlink->dst; 81 FieldOrderContext *s = ctx->priv; 82 AVFilterLink *outlink = ctx->outputs[0]; 83 int h, plane, src_line_step, dst_line_step, line_size, line; 84 uint8_t *dst, *src; 85 AVFrame *out; 86 87 if (!frame->interlaced_frame || 88 frame->top_field_first == s->dst_tff) { 89 av_log(ctx, AV_LOG_VERBOSE, 90 "Skipping %s.\n", 91 frame->interlaced_frame ? 92 "frame with same field order" : "progressive frame"); 93 return ff_filter_frame(outlink, frame); 94 } 95 96 if (av_frame_is_writable(frame)) { 97 out = frame; 98 } else { 99 out = ff_get_video_buffer(outlink, outlink->w, outlink->h); 100 if (!out) { 101 av_frame_free(&frame); 102 return AVERROR(ENOMEM); 103 } 104 av_frame_copy_props(out, frame); 105 } 106 107 av_dlog(ctx, 108 "picture will move %s one line\n", 109 s->dst_tff ? "up" : "down"); 110 h = frame->height; 111 for (plane = 0; plane < 4 && frame->data[plane] && frame->linesize[plane]; plane++) { 112 dst_line_step = out->linesize[plane]; 113 src_line_step = frame->linesize[plane]; 114 line_size = s->line_size[plane]; 115 dst = out->data[plane]; 116 src = frame->data[plane]; 117 if (s->dst_tff) { 118 /** Move every line up one line, working from 119 * the top to the bottom of the frame. 120 * The original top line is lost. 121 * The new last line is created as a copy of the 122 * penultimate line from that field. */ 123 for (line = 0; line < h; line++) { 124 if (1 + line < frame->height) { 125 memcpy(dst, src + src_line_step, line_size); 126 } else { 127 memcpy(dst, src - 2 * src_line_step, line_size); 128 } 129 dst += dst_line_step; 130 src += src_line_step; 131 } 132 } else { 133 /** Move every line down one line, working from 134 * the bottom to the top of the frame. 135 * The original bottom line is lost. 136 * The new first line is created as a copy of the 137 * second line from that field. */ 138 dst += (h - 1) * dst_line_step; 139 src += (h - 1) * src_line_step; 140 for (line = h - 1; line >= 0 ; line--) { 141 if (line > 0) { 142 memcpy(dst, src - src_line_step, line_size); 143 } else { 144 memcpy(dst, src + 2 * src_line_step, line_size); 145 } 146 dst -= dst_line_step; 147 src -= src_line_step; 148 } 149 } 150 } 151 out->top_field_first = s->dst_tff; 152 153 if (frame != out) 154 av_frame_free(&frame); 155 return ff_filter_frame(outlink, out); 156} 157 158#define OFFSET(x) offsetof(FieldOrderContext, x) 159#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM 160 161static const AVOption fieldorder_options[] = { 162 { "order", "output field order", OFFSET(dst_tff), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, FLAGS, "order" }, 163 { "bff", "bottom field first", 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, .flags=FLAGS, .unit = "order" }, 164 { "tff", "top field first", 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, .flags=FLAGS, .unit = "order" }, 165 { NULL } 166}; 167 168AVFILTER_DEFINE_CLASS(fieldorder); 169 170static const AVFilterPad avfilter_vf_fieldorder_inputs[] = { 171 { 172 .name = "default", 173 .type = AVMEDIA_TYPE_VIDEO, 174 .config_props = config_input, 175 .filter_frame = filter_frame, 176 }, 177 { NULL } 178}; 179 180static const AVFilterPad avfilter_vf_fieldorder_outputs[] = { 181 { 182 .name = "default", 183 .type = AVMEDIA_TYPE_VIDEO, 184 }, 185 { NULL } 186}; 187 188AVFilter ff_vf_fieldorder = { 189 .name = "fieldorder", 190 .description = NULL_IF_CONFIG_SMALL("Set the field order."), 191 .priv_size = sizeof(FieldOrderContext), 192 .priv_class = &fieldorder_class, 193 .query_formats = query_formats, 194 .inputs = avfilter_vf_fieldorder_inputs, 195 .outputs = avfilter_vf_fieldorder_outputs, 196 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, 197}; 198