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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 "internal.h" | |
37 | #include "video.h" | |
38 | ||
39 | enum ScanMode { | |
40 | MODE_TFF = 0, | |
41 | MODE_BFF = 1, | |
42 | }; | |
43 | ||
44 | enum FieldType { | |
45 | FIELD_UPPER = 0, | |
46 | FIELD_LOWER = 1, | |
47 | }; | |
48 | ||
49 | typedef struct InterlaceContext { | |
50 | const AVClass *class; | |
51 | enum ScanMode scan; // top or bottom field first scanning | |
52 | int lowpass; // enable or disable low pass filterning | |
53 | AVFrame *cur, *next; // the two frames from which the new one is obtained | |
54 | } InterlaceContext; | |
55 | ||
56 | #define OFFSET(x) offsetof(InterlaceContext, x) | |
57 | #define V AV_OPT_FLAG_VIDEO_PARAM | |
58 | static const AVOption interlace_options[] = { | |
59 | { "scan", "scanning mode", OFFSET(scan), | |
60 | AV_OPT_TYPE_INT, {.i64 = MODE_TFF }, 0, 1, .flags = V, .unit = "scan" }, | |
61 | { "tff", "top field first", 0, | |
62 | AV_OPT_TYPE_CONST, {.i64 = MODE_TFF }, INT_MIN, INT_MAX, .flags = V, .unit = "scan" }, | |
63 | { "bff", "bottom field first", 0, | |
64 | AV_OPT_TYPE_CONST, {.i64 = MODE_BFF }, INT_MIN, INT_MAX, .flags = V, .unit = "scan" }, | |
65 | { "lowpass", "enable vertical low-pass filter", OFFSET(lowpass), | |
66 | AV_OPT_TYPE_INT, {.i64 = 1 }, 0, 1, .flags = V }, | |
67 | { NULL } | |
68 | }; | |
69 | ||
70 | AVFILTER_DEFINE_CLASS(interlace); | |
71 | ||
72 | static const enum AVPixelFormat formats_supported[] = { | |
73 | AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, | |
74 | AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUVA420P, | |
75 | AV_PIX_FMT_GRAY8, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, | |
76 | AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_NONE | |
77 | }; | |
78 | ||
79 | static int query_formats(AVFilterContext *ctx) | |
80 | { | |
81 | ff_set_common_formats(ctx, ff_make_format_list(formats_supported)); | |
82 | return 0; | |
83 | } | |
84 | ||
85 | static av_cold void uninit(AVFilterContext *ctx) | |
86 | { | |
87 | InterlaceContext *s = ctx->priv; | |
88 | ||
89 | av_frame_free(&s->cur); | |
90 | av_frame_free(&s->next); | |
91 | } | |
92 | ||
93 | static int config_out_props(AVFilterLink *outlink) | |
94 | { | |
95 | AVFilterContext *ctx = outlink->src; | |
96 | AVFilterLink *inlink = outlink->src->inputs[0]; | |
97 | InterlaceContext *s = ctx->priv; | |
98 | ||
99 | if (inlink->h < 2) { | |
100 | av_log(ctx, AV_LOG_ERROR, "input video height is too small\n"); | |
101 | return AVERROR_INVALIDDATA; | |
102 | } | |
103 | ||
104 | if (!s->lowpass) | |
105 | av_log(ctx, AV_LOG_WARNING, "***warning*** Lowpass filter is disabled, " | |
106 | "the resulting video will be aliased rather than interlaced.\n"); | |
107 | ||
108 | // same input size | |
109 | outlink->w = inlink->w; | |
110 | outlink->h = inlink->h; | |
111 | outlink->time_base = inlink->time_base; | |
112 | outlink->frame_rate = inlink->frame_rate; | |
113 | // half framerate | |
114 | outlink->time_base.num *= 2; | |
115 | outlink->frame_rate.den *= 2; | |
116 | outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP; | |
117 | ||
118 | av_log(ctx, AV_LOG_VERBOSE, "%s interlacing %s lowpass filter\n", | |
119 | s->scan == MODE_TFF ? "tff" : "bff", (s->lowpass) ? "with" : "without"); | |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
124 | static void copy_picture_field(AVFrame *src_frame, AVFrame *dst_frame, | |
125 | AVFilterLink *inlink, enum FieldType field_type, | |
126 | int lowpass) | |
127 | { | |
128 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); | |
129 | int vsub = desc->log2_chroma_h; | |
130 | int plane, i, j; | |
131 | ||
132 | for (plane = 0; plane < desc->nb_components; plane++) { | |
133 | int lines = (plane == 1 || plane == 2) ? FF_CEIL_RSHIFT(inlink->h, vsub) : inlink->h; | |
134 | int linesize = av_image_get_linesize(inlink->format, inlink->w, plane); | |
135 | uint8_t *dstp = dst_frame->data[plane]; | |
136 | const uint8_t *srcp = src_frame->data[plane]; | |
137 | ||
138 | av_assert0(linesize >= 0); | |
139 | ||
140 | lines = (lines + (field_type == FIELD_UPPER)) / 2; | |
141 | if (field_type == FIELD_LOWER) | |
142 | srcp += src_frame->linesize[plane]; | |
143 | if (field_type == FIELD_LOWER) | |
144 | dstp += dst_frame->linesize[plane]; | |
145 | if (lowpass) { | |
146 | int srcp_linesize = src_frame->linesize[plane] * 2; | |
147 | int dstp_linesize = dst_frame->linesize[plane] * 2; | |
148 | for (j = lines; j > 0; j--) { | |
149 | const uint8_t *srcp_above = srcp - src_frame->linesize[plane]; | |
150 | const uint8_t *srcp_below = srcp + src_frame->linesize[plane]; | |
151 | if (j == lines) | |
152 | srcp_above = srcp; // there is no line above | |
153 | if (j == 1) | |
154 | srcp_below = srcp; // there is no line below | |
155 | for (i = 0; i < linesize; i++) { | |
156 | // this calculation is an integer representation of | |
157 | // '0.5 * current + 0.25 * above + 0.25 * below' | |
158 | // '1 +' is for rounding. | |
159 | dstp[i] = (1 + srcp[i] + srcp[i] + srcp_above[i] + srcp_below[i]) >> 2; | |
160 | } | |
161 | dstp += dstp_linesize; | |
162 | srcp += srcp_linesize; | |
163 | } | |
164 | } else { | |
165 | av_image_copy_plane(dstp, dst_frame->linesize[plane] * 2, | |
166 | srcp, src_frame->linesize[plane] * 2, | |
167 | linesize, lines); | |
168 | } | |
169 | } | |
170 | } | |
171 | ||
172 | static int filter_frame(AVFilterLink *inlink, AVFrame *buf) | |
173 | { | |
174 | AVFilterContext *ctx = inlink->dst; | |
175 | AVFilterLink *outlink = ctx->outputs[0]; | |
176 | InterlaceContext *s = ctx->priv; | |
177 | AVFrame *out; | |
178 | int tff, ret; | |
179 | ||
180 | av_frame_free(&s->cur); | |
181 | s->cur = s->next; | |
182 | s->next = buf; | |
183 | ||
184 | /* we need at least two frames */ | |
185 | if (!s->cur || !s->next) | |
186 | return 0; | |
187 | ||
188 | if (s->cur->interlaced_frame) { | |
189 | av_log(ctx, AV_LOG_WARNING, | |
190 | "video is already interlaced, adjusting framerate only\n"); | |
191 | out = av_frame_clone(s->cur); | |
192 | if (!out) | |
193 | return AVERROR(ENOMEM); | |
194 | out->pts /= 2; // adjust pts to new framerate | |
195 | ret = ff_filter_frame(outlink, out); | |
196 | return ret; | |
197 | } | |
198 | ||
199 | tff = (s->scan == MODE_TFF); | |
200 | out = ff_get_video_buffer(outlink, outlink->w, outlink->h); | |
201 | if (!out) | |
202 | return AVERROR(ENOMEM); | |
203 | ||
204 | av_frame_copy_props(out, s->cur); | |
205 | out->interlaced_frame = 1; | |
206 | out->top_field_first = tff; | |
207 | out->pts /= 2; // adjust pts to new framerate | |
208 | ||
209 | /* copy upper/lower field from cur */ | |
210 | copy_picture_field(s->cur, out, inlink, tff ? FIELD_UPPER : FIELD_LOWER, s->lowpass); | |
211 | av_frame_free(&s->cur); | |
212 | ||
213 | /* copy lower/upper field from next */ | |
214 | copy_picture_field(s->next, out, inlink, tff ? FIELD_LOWER : FIELD_UPPER, s->lowpass); | |
215 | av_frame_free(&s->next); | |
216 | ||
217 | ret = ff_filter_frame(outlink, out); | |
218 | ||
219 | return ret; | |
220 | } | |
221 | ||
222 | static const AVFilterPad inputs[] = { | |
223 | { | |
224 | .name = "default", | |
225 | .type = AVMEDIA_TYPE_VIDEO, | |
226 | .filter_frame = filter_frame, | |
227 | }, | |
228 | { NULL } | |
229 | }; | |
230 | ||
231 | static const AVFilterPad outputs[] = { | |
232 | { | |
233 | .name = "default", | |
234 | .type = AVMEDIA_TYPE_VIDEO, | |
235 | .config_props = config_out_props, | |
236 | }, | |
237 | { NULL } | |
238 | }; | |
239 | ||
240 | AVFilter ff_vf_interlace = { | |
241 | .name = "interlace", | |
242 | .description = NULL_IF_CONFIG_SMALL("Convert progressive video into interlaced."), | |
243 | .uninit = uninit, | |
244 | .priv_class = &interlace_class, | |
245 | .priv_size = sizeof(InterlaceContext), | |
246 | .query_formats = query_formats, | |
247 | .inputs = inputs, | |
248 | .outputs = outputs, | |
249 | }; |