blob: ca55ff1f668a248dcf0255df3e1c6b19fe8c6b9c
| 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 | |
| 35 | typedef 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 | |
| 41 | static 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 | return ret; |
| 60 | } |
| 61 | if ((ret = ff_formats_ref(formats, &ctx->inputs[0]->out_formats)) < 0 || |
| 62 | (ret = ff_formats_ref(formats, &ctx->outputs[0]->in_formats)) < 0) |
| 63 | return ret; |
| 64 | } |
| 65 | |
| 66 | return 0; |
| 67 | } |
| 68 | |
| 69 | static int config_input(AVFilterLink *inlink) |
| 70 | { |
| 71 | AVFilterContext *ctx = inlink->dst; |
| 72 | FieldOrderContext *s = ctx->priv; |
| 73 | |
| 74 | return av_image_fill_linesizes(s->line_size, inlink->format, inlink->w); |
| 75 | } |
| 76 | |
| 77 | static int filter_frame(AVFilterLink *inlink, AVFrame *frame) |
| 78 | { |
| 79 | AVFilterContext *ctx = inlink->dst; |
| 80 | FieldOrderContext *s = ctx->priv; |
| 81 | AVFilterLink *outlink = ctx->outputs[0]; |
| 82 | int h, plane, src_line_step, dst_line_step, line_size, line; |
| 83 | uint8_t *dst, *src; |
| 84 | AVFrame *out; |
| 85 | |
| 86 | if (!frame->interlaced_frame || |
| 87 | frame->top_field_first == s->dst_tff) { |
| 88 | av_log(ctx, AV_LOG_VERBOSE, |
| 89 | "Skipping %s.\n", |
| 90 | frame->interlaced_frame ? |
| 91 | "frame with same field order" : "progressive frame"); |
| 92 | return ff_filter_frame(outlink, frame); |
| 93 | } |
| 94 | |
| 95 | if (av_frame_is_writable(frame)) { |
| 96 | out = frame; |
| 97 | } else { |
| 98 | out = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
| 99 | if (!out) { |
| 100 | av_frame_free(&frame); |
| 101 | return AVERROR(ENOMEM); |
| 102 | } |
| 103 | av_frame_copy_props(out, frame); |
| 104 | } |
| 105 | |
| 106 | av_log(ctx, AV_LOG_TRACE, |
| 107 | "picture will move %s one line\n", |
| 108 | s->dst_tff ? "up" : "down"); |
| 109 | h = frame->height; |
| 110 | for (plane = 0; plane < 4 && frame->data[plane] && frame->linesize[plane]; plane++) { |
| 111 | dst_line_step = out->linesize[plane]; |
| 112 | src_line_step = frame->linesize[plane]; |
| 113 | line_size = s->line_size[plane]; |
| 114 | dst = out->data[plane]; |
| 115 | src = frame->data[plane]; |
| 116 | if (s->dst_tff) { |
| 117 | /** Move every line up one line, working from |
| 118 | * the top to the bottom of the frame. |
| 119 | * The original top line is lost. |
| 120 | * The new last line is created as a copy of the |
| 121 | * penultimate line from that field. */ |
| 122 | for (line = 0; line < h; line++) { |
| 123 | if (1 + line < frame->height) { |
| 124 | memcpy(dst, src + src_line_step, line_size); |
| 125 | } else { |
| 126 | memcpy(dst, src - 2 * src_line_step, line_size); |
| 127 | } |
| 128 | dst += dst_line_step; |
| 129 | src += src_line_step; |
| 130 | } |
| 131 | } else { |
| 132 | /** Move every line down one line, working from |
| 133 | * the bottom to the top of the frame. |
| 134 | * The original bottom line is lost. |
| 135 | * The new first line is created as a copy of the |
| 136 | * second line from that field. */ |
| 137 | dst += (h - 1) * dst_line_step; |
| 138 | src += (h - 1) * src_line_step; |
| 139 | for (line = h - 1; line >= 0 ; line--) { |
| 140 | if (line > 0) { |
| 141 | memcpy(dst, src - src_line_step, line_size); |
| 142 | } else { |
| 143 | memcpy(dst, src + 2 * src_line_step, line_size); |
| 144 | } |
| 145 | dst -= dst_line_step; |
| 146 | src -= src_line_step; |
| 147 | } |
| 148 | } |
| 149 | } |
| 150 | out->top_field_first = s->dst_tff; |
| 151 | |
| 152 | if (frame != out) |
| 153 | av_frame_free(&frame); |
| 154 | return ff_filter_frame(outlink, out); |
| 155 | } |
| 156 | |
| 157 | #define OFFSET(x) offsetof(FieldOrderContext, x) |
| 158 | #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
| 159 | |
| 160 | static const AVOption fieldorder_options[] = { |
| 161 | { "order", "output field order", OFFSET(dst_tff), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, FLAGS, "order" }, |
| 162 | { "bff", "bottom field first", 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, .flags=FLAGS, .unit = "order" }, |
| 163 | { "tff", "top field first", 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, .flags=FLAGS, .unit = "order" }, |
| 164 | { NULL } |
| 165 | }; |
| 166 | |
| 167 | AVFILTER_DEFINE_CLASS(fieldorder); |
| 168 | |
| 169 | static const AVFilterPad avfilter_vf_fieldorder_inputs[] = { |
| 170 | { |
| 171 | .name = "default", |
| 172 | .type = AVMEDIA_TYPE_VIDEO, |
| 173 | .config_props = config_input, |
| 174 | .filter_frame = filter_frame, |
| 175 | }, |
| 176 | { NULL } |
| 177 | }; |
| 178 | |
| 179 | static const AVFilterPad avfilter_vf_fieldorder_outputs[] = { |
| 180 | { |
| 181 | .name = "default", |
| 182 | .type = AVMEDIA_TYPE_VIDEO, |
| 183 | }, |
| 184 | { NULL } |
| 185 | }; |
| 186 | |
| 187 | AVFilter ff_vf_fieldorder = { |
| 188 | .name = "fieldorder", |
| 189 | .description = NULL_IF_CONFIG_SMALL("Set the field order."), |
| 190 | .priv_size = sizeof(FieldOrderContext), |
| 191 | .priv_class = &fieldorder_class, |
| 192 | .query_formats = query_formats, |
| 193 | .inputs = avfilter_vf_fieldorder_inputs, |
| 194 | .outputs = avfilter_vf_fieldorder_outputs, |
| 195 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
| 196 | }; |
| 197 |