h264_metadata: Add option to delete filler data
[libav.git] / libavfilter / vf_interlace.c
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1/*
2 * This file is part of Libav.
3 *
4 * Libav is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * Libav is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with Libav; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17 */
18
19/**
20 * @file
21 * progressive to interlaced content filter, inspired by heavy debugging of tinterlace filter
22 */
23
24#include "libavutil/common.h"
25#include "libavutil/opt.h"
26#include "libavutil/imgutils.h"
27#include "libavutil/avassert.h"
28
29#include "formats.h"
30#include "avfilter.h"
2e170405 31#include "interlace.h"
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32#include "internal.h"
33#include "video.h"
34
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35#define OFFSET(x) offsetof(InterlaceContext, x)
36#define V AV_OPT_FLAG_VIDEO_PARAM
37static const AVOption options[] = {
38 { "scan", "scanning mode", OFFSET(scan),
39 AV_OPT_TYPE_INT, {.i64 = MODE_TFF }, 0, 1, .flags = V, .unit = "scan" },
40 { "tff", "top field first", 0,
41 AV_OPT_TYPE_CONST, {.i64 = MODE_TFF }, INT_MIN, INT_MAX, .flags = V, .unit = "scan" },
42 { "bff", "bottom field first", 0,
43 AV_OPT_TYPE_CONST, {.i64 = MODE_BFF }, INT_MIN, INT_MAX, .flags = V, .unit = "scan" },
52269f48 44 { "lowpass", "enable vertical low-pass filter", OFFSET(lowpass),
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45 AV_OPT_TYPE_INT, {.i64 = 1 }, 0, 1, .flags = V },
46 { NULL }
47};
48
49static const AVClass class = {
50 .class_name = "interlace filter",
51 .item_name = av_default_item_name,
52 .option = options,
53 .version = LIBAVUTIL_VERSION_INT,
54};
55
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56static 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}
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69
70static 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
77static int query_formats(AVFilterContext *ctx)
78{
79 ff_set_common_formats(ctx, ff_make_format_list(formats_supported));
80 return 0;
81}
82
83static 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 av_opt_free(s);
91}
92
93static 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 }
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103
104 if (!s->lowpass)
4438c256 105 av_log(ctx, AV_LOG_WARNING, "Lowpass filter is disabled, "
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106 "the resulting video will be aliased rather than interlaced.\n");
107
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108 // same input size
109 outlink->w = inlink->w;
110 outlink->h = inlink->h;
111 outlink->time_base = inlink->time_base;
65e73bc6 112 outlink->frame_rate = inlink->frame_rate;
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113 // half framerate
114 outlink->time_base.num *= 2;
65e73bc6 115 outlink->frame_rate.den *= 2;
3fce1367 116
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117
118 if (s->lowpass) {
119 s->lowpass_line = lowpass_line_c;
120 if (ARCH_X86)
121 ff_interlace_init_x86(s);
122 }
123
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124 av_log(ctx, AV_LOG_VERBOSE, "%s interlacing %s lowpass filter\n",
125 s->scan == MODE_TFF ? "tff" : "bff", (s->lowpass) ? "with" : "without");
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126
127 return 0;
128}
129
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130static void copy_picture_field(InterlaceContext *s,
131 AVFrame *src_frame, AVFrame *dst_frame,
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132 AVFilterLink *inlink, enum FieldType field_type,
133 int lowpass)
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134{
135 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
696141e8 136 int hsub = desc->log2_chroma_w;
3fce1367 137 int vsub = desc->log2_chroma_h;
2e170405 138 int plane, j;
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139
140 for (plane = 0; plane < desc->nb_components; plane++) {
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141 int cols = (plane == 1 || plane == 2) ? AV_CEIL_RSHIFT(inlink->w, hsub)
142 : inlink->w;
143 int lines = (plane == 1 || plane == 2) ? AV_CEIL_RSHIFT(inlink->h, vsub)
144 : inlink->h;
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145 uint8_t *dstp = dst_frame->data[plane];
146 const uint8_t *srcp = src_frame->data[plane];
147
046f75a9 148 av_assert0(cols >= 0 || lines >= 0);
3fce1367 149
bec509db 150 lines = (lines + (field_type == FIELD_UPPER)) / 2;
15ea2227 151 if (field_type == FIELD_LOWER) {
3fce1367 152 srcp += src_frame->linesize[plane];
3fce1367 153 dstp += dst_frame->linesize[plane];
15ea2227 154 }
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155 if (lowpass) {
156 int srcp_linesize = src_frame->linesize[plane] * 2;
157 int dstp_linesize = dst_frame->linesize[plane] * 2;
158 for (j = lines; j > 0; j--) {
159 const uint8_t *srcp_above = srcp - src_frame->linesize[plane];
160 const uint8_t *srcp_below = srcp + src_frame->linesize[plane];
161 if (j == lines)
162 srcp_above = srcp; // there is no line above
163 if (j == 1)
164 srcp_below = srcp; // there is no line below
696141e8 165 s->lowpass_line(dstp, cols, srcp, srcp_above, srcp_below);
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166 dstp += dstp_linesize;
167 srcp += srcp_linesize;
3fce1367 168 }
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169 } else {
170 av_image_copy_plane(dstp, dst_frame->linesize[plane] * 2,
171 srcp, src_frame->linesize[plane] * 2,
696141e8 172 cols, lines);
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173 }
174 }
175}
176
177static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
178{
179 AVFilterContext *ctx = inlink->dst;
180 AVFilterLink *outlink = ctx->outputs[0];
181 InterlaceContext *s = ctx->priv;
182 AVFrame *out;
183 int tff, ret;
184
185 av_frame_free(&s->cur);
186 s->cur = s->next;
187 s->next = buf;
188
189 /* we need at least two frames */
190 if (!s->cur || !s->next)
191 return 0;
192
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193 if (s->cur->interlaced_frame) {
194 av_log(ctx, AV_LOG_WARNING,
195 "video is already interlaced, adjusting framerate only\n");
196 out = av_frame_clone(s->cur);
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197 if (!out)
198 return AVERROR(ENOMEM);
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199 out->pts /= 2; // adjust pts to new framerate
200 ret = ff_filter_frame(outlink, out);
201 s->got_output = 1;
202 return ret;
203 }
204
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205 tff = (s->scan == MODE_TFF);
206 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
207 if (!out)
208 return AVERROR(ENOMEM);
209
210 av_frame_copy_props(out, s->cur);
211 out->interlaced_frame = 1;
212 out->top_field_first = tff;
213 out->pts /= 2; // adjust pts to new framerate
214
215 /* copy upper/lower field from cur */
2e170405 216 copy_picture_field(s, s->cur, out, inlink, tff ? FIELD_UPPER : FIELD_LOWER, s->lowpass);
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217 av_frame_free(&s->cur);
218
219 /* copy lower/upper field from next */
2e170405 220 copy_picture_field(s, s->next, out, inlink, tff ? FIELD_LOWER : FIELD_UPPER, s->lowpass);
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221 av_frame_free(&s->next);
222
223 ret = ff_filter_frame(outlink, out);
224 s->got_output = 1;
225
226 return ret;
227}
228
229static int request_frame(AVFilterLink *outlink)
230{
231 AVFilterContext *ctx = outlink->src;
232 InterlaceContext *s = ctx->priv;
233 int ret = 0;
234
235 s->got_output = 0;
236 while (ret >= 0 && !s->got_output)
237 ret = ff_request_frame(ctx->inputs[0]);
238
239 return ret;
240}
241
242static const AVFilterPad inputs[] = {
243 {
244 .name = "default",
245 .type = AVMEDIA_TYPE_VIDEO,
246 .filter_frame = filter_frame,
247 },
248 { NULL }
249};
250
251static const AVFilterPad outputs[] = {
252 {
253 .name = "default",
254 .type = AVMEDIA_TYPE_VIDEO,
255 .config_props = config_out_props,
256 .request_frame = request_frame,
257 },
258 { NULL }
259};
260
cd43ca04 261AVFilter ff_vf_interlace = {
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262 .name = "interlace",
263 .description = NULL_IF_CONFIG_SMALL("Convert progressive video into interlaced."),
264 .uninit = uninit,
265
266 .priv_class = &class,
267 .priv_size = sizeof(InterlaceContext),
268 .query_formats = query_formats,
269
270 .inputs = inputs,
271 .outputs = outputs,
272};
273