| 1 | /* |
| 2 | * Copyright (c) 2003 Michael Zucchi <notzed@ximian.com> |
| 3 | * Copyright (c) 2010 Baptiste Coudurier |
| 4 | * Copyright (c) 2011 Stefano Sabatini |
| 5 | * Copyright (c) 2013 Vittorio Giovara <vittorio.giovara@gmail.com> |
| 6 | * |
| 7 | * This file is part of FFmpeg. |
| 8 | * |
| 9 | * FFmpeg is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * FFmpeg is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License along |
| 20 | * with FFmpeg; if not, write to the Free Software Foundation, Inc., |
| 21 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 22 | */ |
| 23 | |
| 24 | /** |
| 25 | * @file |
| 26 | * progressive to interlaced content filter, inspired by heavy debugging of tinterlace filter |
| 27 | */ |
| 28 | |
| 29 | #include "libavutil/common.h" |
| 30 | #include "libavutil/opt.h" |
| 31 | #include "libavutil/imgutils.h" |
| 32 | #include "libavutil/avassert.h" |
| 33 | |
| 34 | #include "formats.h" |
| 35 | #include "avfilter.h" |
| 36 | #include "interlace.h" |
| 37 | #include "internal.h" |
| 38 | #include "video.h" |
| 39 | |
| 40 | #define OFFSET(x) offsetof(InterlaceContext, x) |
| 41 | #define V AV_OPT_FLAG_VIDEO_PARAM |
| 42 | static const AVOption interlace_options[] = { |
| 43 | { "scan", "scanning mode", OFFSET(scan), |
| 44 | AV_OPT_TYPE_INT, {.i64 = MODE_TFF }, 0, 1, .flags = V, .unit = "scan" }, |
| 45 | { "tff", "top field first", 0, |
| 46 | AV_OPT_TYPE_CONST, {.i64 = MODE_TFF }, INT_MIN, INT_MAX, .flags = V, .unit = "scan" }, |
| 47 | { "bff", "bottom field first", 0, |
| 48 | AV_OPT_TYPE_CONST, {.i64 = MODE_BFF }, INT_MIN, INT_MAX, .flags = V, .unit = "scan" }, |
| 49 | { "lowpass", "enable vertical low-pass filter", OFFSET(lowpass), |
| 50 | AV_OPT_TYPE_INT, {.i64 = 1 }, 0, 1, .flags = V }, |
| 51 | { NULL } |
| 52 | }; |
| 53 | |
| 54 | AVFILTER_DEFINE_CLASS(interlace); |
| 55 | |
| 56 | static void lowpass_line_c(uint8_t *dstp, ptrdiff_t linesize, |
| 57 | const uint8_t *srcp, |
| 58 | const uint8_t *srcp_above, |
| 59 | const uint8_t *srcp_below) |
| 60 | { |
| 61 | int i; |
| 62 | for (i = 0; i < linesize; i++) { |
| 63 | // this calculation is an integer representation of |
| 64 | // '0.5 * current + 0.25 * above + 0.25 * below' |
| 65 | // '1 +' is for rounding. |
| 66 | dstp[i] = (1 + srcp[i] + srcp[i] + srcp_above[i] + srcp_below[i]) >> 2; |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | static const enum AVPixelFormat formats_supported[] = { |
| 71 | AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, |
| 72 | AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUVA420P, |
| 73 | AV_PIX_FMT_GRAY8, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, |
| 74 | AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_NONE |
| 75 | }; |
| 76 | |
| 77 | static int query_formats(AVFilterContext *ctx) |
| 78 | { |
| 79 | ff_set_common_formats(ctx, ff_make_format_list(formats_supported)); |
| 80 | return 0; |
| 81 | } |
| 82 | |
| 83 | static av_cold void uninit(AVFilterContext *ctx) |
| 84 | { |
| 85 | InterlaceContext *s = ctx->priv; |
| 86 | |
| 87 | av_frame_free(&s->cur); |
| 88 | av_frame_free(&s->next); |
| 89 | } |
| 90 | |
| 91 | static int config_out_props(AVFilterLink *outlink) |
| 92 | { |
| 93 | AVFilterContext *ctx = outlink->src; |
| 94 | AVFilterLink *inlink = outlink->src->inputs[0]; |
| 95 | InterlaceContext *s = ctx->priv; |
| 96 | |
| 97 | if (inlink->h < 2) { |
| 98 | av_log(ctx, AV_LOG_ERROR, "input video height is too small\n"); |
| 99 | return AVERROR_INVALIDDATA; |
| 100 | } |
| 101 | |
| 102 | if (!s->lowpass) |
| 103 | av_log(ctx, AV_LOG_WARNING, "***warning*** Lowpass filter is disabled, " |
| 104 | "the resulting video will be aliased rather than interlaced.\n"); |
| 105 | |
| 106 | // same input size |
| 107 | outlink->w = inlink->w; |
| 108 | outlink->h = inlink->h; |
| 109 | outlink->time_base = inlink->time_base; |
| 110 | outlink->frame_rate = inlink->frame_rate; |
| 111 | // half framerate |
| 112 | outlink->time_base.num *= 2; |
| 113 | outlink->frame_rate.den *= 2; |
| 114 | outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP; |
| 115 | |
| 116 | |
| 117 | if (s->lowpass) { |
| 118 | s->lowpass_line = lowpass_line_c; |
| 119 | if (ARCH_X86) |
| 120 | ff_interlace_init_x86(s); |
| 121 | } |
| 122 | |
| 123 | av_log(ctx, AV_LOG_VERBOSE, "%s interlacing %s lowpass filter\n", |
| 124 | s->scan == MODE_TFF ? "tff" : "bff", (s->lowpass) ? "with" : "without"); |
| 125 | |
| 126 | return 0; |
| 127 | } |
| 128 | |
| 129 | static void copy_picture_field(InterlaceContext *s, |
| 130 | AVFrame *src_frame, AVFrame *dst_frame, |
| 131 | AVFilterLink *inlink, enum FieldType field_type, |
| 132 | int lowpass) |
| 133 | { |
| 134 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
| 135 | int vsub = desc->log2_chroma_h; |
| 136 | int plane, j; |
| 137 | |
| 138 | for (plane = 0; plane < desc->nb_components; plane++) { |
| 139 | int lines = (plane == 1 || plane == 2) ? FF_CEIL_RSHIFT(inlink->h, vsub) : inlink->h; |
| 140 | ptrdiff_t linesize = av_image_get_linesize(inlink->format, inlink->w, plane); |
| 141 | uint8_t *dstp = dst_frame->data[plane]; |
| 142 | const uint8_t *srcp = src_frame->data[plane]; |
| 143 | |
| 144 | av_assert0(linesize >= 0); |
| 145 | |
| 146 | lines = (lines + (field_type == FIELD_UPPER)) / 2; |
| 147 | if (field_type == FIELD_LOWER) |
| 148 | srcp += src_frame->linesize[plane]; |
| 149 | if (field_type == FIELD_LOWER) |
| 150 | dstp += dst_frame->linesize[plane]; |
| 151 | if (lowpass) { |
| 152 | int srcp_linesize = src_frame->linesize[plane] * 2; |
| 153 | int dstp_linesize = dst_frame->linesize[plane] * 2; |
| 154 | for (j = lines; j > 0; j--) { |
| 155 | const uint8_t *srcp_above = srcp - src_frame->linesize[plane]; |
| 156 | const uint8_t *srcp_below = srcp + src_frame->linesize[plane]; |
| 157 | if (j == lines) |
| 158 | srcp_above = srcp; // there is no line above |
| 159 | if (j == 1) |
| 160 | srcp_below = srcp; // there is no line below |
| 161 | s->lowpass_line(dstp, linesize, srcp, srcp_above, srcp_below); |
| 162 | dstp += dstp_linesize; |
| 163 | srcp += srcp_linesize; |
| 164 | } |
| 165 | } else { |
| 166 | av_image_copy_plane(dstp, dst_frame->linesize[plane] * 2, |
| 167 | srcp, src_frame->linesize[plane] * 2, |
| 168 | linesize, lines); |
| 169 | } |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | static int filter_frame(AVFilterLink *inlink, AVFrame *buf) |
| 174 | { |
| 175 | AVFilterContext *ctx = inlink->dst; |
| 176 | AVFilterLink *outlink = ctx->outputs[0]; |
| 177 | InterlaceContext *s = ctx->priv; |
| 178 | AVFrame *out; |
| 179 | int tff, ret; |
| 180 | |
| 181 | av_frame_free(&s->cur); |
| 182 | s->cur = s->next; |
| 183 | s->next = buf; |
| 184 | |
| 185 | /* we need at least two frames */ |
| 186 | if (!s->cur || !s->next) |
| 187 | return 0; |
| 188 | |
| 189 | if (s->cur->interlaced_frame) { |
| 190 | av_log(ctx, AV_LOG_WARNING, |
| 191 | "video is already interlaced, adjusting framerate only\n"); |
| 192 | out = av_frame_clone(s->cur); |
| 193 | if (!out) |
| 194 | return AVERROR(ENOMEM); |
| 195 | out->pts /= 2; // adjust pts to new framerate |
| 196 | ret = ff_filter_frame(outlink, out); |
| 197 | return ret; |
| 198 | } |
| 199 | |
| 200 | tff = (s->scan == MODE_TFF); |
| 201 | out = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
| 202 | if (!out) |
| 203 | return AVERROR(ENOMEM); |
| 204 | |
| 205 | av_frame_copy_props(out, s->cur); |
| 206 | out->interlaced_frame = 1; |
| 207 | out->top_field_first = tff; |
| 208 | out->pts /= 2; // adjust pts to new framerate |
| 209 | |
| 210 | /* copy upper/lower field from cur */ |
| 211 | copy_picture_field(s, s->cur, out, inlink, tff ? FIELD_UPPER : FIELD_LOWER, s->lowpass); |
| 212 | av_frame_free(&s->cur); |
| 213 | |
| 214 | /* copy lower/upper field from next */ |
| 215 | copy_picture_field(s, s->next, out, inlink, tff ? FIELD_LOWER : FIELD_UPPER, s->lowpass); |
| 216 | av_frame_free(&s->next); |
| 217 | |
| 218 | ret = ff_filter_frame(outlink, out); |
| 219 | |
| 220 | return ret; |
| 221 | } |
| 222 | |
| 223 | static const AVFilterPad inputs[] = { |
| 224 | { |
| 225 | .name = "default", |
| 226 | .type = AVMEDIA_TYPE_VIDEO, |
| 227 | .filter_frame = filter_frame, |
| 228 | }, |
| 229 | { NULL } |
| 230 | }; |
| 231 | |
| 232 | static const AVFilterPad outputs[] = { |
| 233 | { |
| 234 | .name = "default", |
| 235 | .type = AVMEDIA_TYPE_VIDEO, |
| 236 | .config_props = config_out_props, |
| 237 | }, |
| 238 | { NULL } |
| 239 | }; |
| 240 | |
| 241 | AVFilter ff_vf_interlace = { |
| 242 | .name = "interlace", |
| 243 | .description = NULL_IF_CONFIG_SMALL("Convert progressive video into interlaced."), |
| 244 | .uninit = uninit, |
| 245 | .priv_class = &interlace_class, |
| 246 | .priv_size = sizeof(InterlaceContext), |
| 247 | .query_formats = query_formats, |
| 248 | .inputs = inputs, |
| 249 | .outputs = outputs, |
| 250 | }; |