Signed-off-by: Dave Rice <dave@dericed.com>
Signed-off-by: Paul B Mahol <onemda@gmail.com>
... | ... |
@@ -11253,6 +11253,76 @@ less than @code{0}, the filter will try to use a good random seed on a |
11253 | 11253 |
best effort basis. |
11254 | 11254 |
@end table |
11255 | 11255 |
|
11256 |
+@section readeia608 |
|
11257 |
+ |
|
11258 |
+Read closed captioning (EIA-608) information from the top lines of a video frame. |
|
11259 |
+ |
|
11260 |
+This filter adds frame metadata for @code{lavfi.readeia608.X.cc} and |
|
11261 |
+@code{lavfi.readeia608.X.line}, where @code{X} is the number of the identified line |
|
11262 |
+with EIA-608 data (starting from 0). A description of each metadata value follows: |
|
11263 |
+ |
|
11264 |
+@table @option |
|
11265 |
+@item lavfi.readeia608.X.cc |
|
11266 |
+The two bytes stored as EIA-608 data (printed in hexadecimal). |
|
11267 |
+ |
|
11268 |
+@item lavfi.readeia608.X.line |
|
11269 |
+The number of the line on which the EIA-608 data was identified and read. |
|
11270 |
+@end table |
|
11271 |
+ |
|
11272 |
+This filter accepts the following options: |
|
11273 |
+ |
|
11274 |
+@table @option |
|
11275 |
+@item scan_min |
|
11276 |
+Set the line to start scanning for EIA-608 data. Default is @code{0}. |
|
11277 |
+ |
|
11278 |
+@item scan_max |
|
11279 |
+Set the line to end scanning for EIA-608 data. Default is @code{29}. |
|
11280 |
+ |
|
11281 |
+@item mac |
|
11282 |
+Set minimal acceptable amplitude change for sync codes detection. |
|
11283 |
+Default is @code{0.2}. Allowed range is @code{[0.001 - 1]}. |
|
11284 |
+ |
|
11285 |
+@item spw |
|
11286 |
+Set the ratio of width reserved for sync code detection. |
|
11287 |
+Default is @code{0.27}. Allowed range is @code{[0.01 - 0.7]}. |
|
11288 |
+ |
|
11289 |
+@item mhd |
|
11290 |
+Set the max peaks height difference for sync code detection. |
|
11291 |
+Default is @code{0.1}. Allowed range is @code{[0.0 - 0.5]}. |
|
11292 |
+ |
|
11293 |
+@item mpd |
|
11294 |
+Set max peaks period difference for sync code detection. |
|
11295 |
+Default is @code{0.1}. Allowed range is @code{[0.0 - 0.5]}. |
|
11296 |
+ |
|
11297 |
+@item msd |
|
11298 |
+Set the first two max start code bits differences. |
|
11299 |
+Default is @code{0.02}. Allowed range is @code{[0.0 - 0.5]}. |
|
11300 |
+ |
|
11301 |
+@item bhd |
|
11302 |
+Set the minimum ratio of bits height compared to 3rd start code bit. |
|
11303 |
+Default is @code{0.75}. Allowed range is @code{[0.01 - 1]}. |
|
11304 |
+ |
|
11305 |
+@item th_w |
|
11306 |
+Set the white color threshold. Default is @code{0.35}. Allowed range is @code{[0.1 - 1]}. |
|
11307 |
+ |
|
11308 |
+@item th_b |
|
11309 |
+Set the black color threshold. Default is @code{0.15}. Allowed range is @code{[0.0 - 0.5]}. |
|
11310 |
+ |
|
11311 |
+@item chp |
|
11312 |
+Enable checking the parity bit. In the event of a parity error, the filter will output |
|
11313 |
+@code{0x00} for that character. Default is false. |
|
11314 |
+@end table |
|
11315 |
+ |
|
11316 |
+@subsection Examples |
|
11317 |
+ |
|
11318 |
+@itemize |
|
11319 |
+@item |
|
11320 |
+Output a csv with presentation time and the first two lines of identified EIA-608 captioning data. |
|
11321 |
+@example |
|
11322 |
+ffprobe -f lavfi -i movie=captioned_video.mov,readeia608 -show_entries frame=pkt_pts_time:frame_tags=lavfi.readeia608.0.cc,lavfi.readeia608.1.cc -of csv |
|
11323 |
+@end example |
|
11324 |
+@end itemize |
|
11325 |
+ |
|
11256 | 11326 |
@section readvitc |
11257 | 11327 |
|
11258 | 11328 |
Read vertical interval timecode (VITC) information from the top lines of a |
... | ... |
@@ -247,6 +247,7 @@ OBJS-$(CONFIG_PSNR_FILTER) += vf_psnr.o dualinput.o framesync. |
247 | 247 |
OBJS-$(CONFIG_PULLUP_FILTER) += vf_pullup.o |
248 | 248 |
OBJS-$(CONFIG_QP_FILTER) += vf_qp.o |
249 | 249 |
OBJS-$(CONFIG_RANDOM_FILTER) += vf_random.o |
250 |
+OBJS-$(CONFIG_READEIA608_FILTER) += vf_readeia608.o |
|
250 | 251 |
OBJS-$(CONFIG_READVITC_FILTER) += vf_readvitc.o |
251 | 252 |
OBJS-$(CONFIG_REALTIME_FILTER) += f_realtime.o |
252 | 253 |
OBJS-$(CONFIG_REMAP_FILTER) += vf_remap.o framesync.o |
... | ... |
@@ -262,6 +262,7 @@ void avfilter_register_all(void) |
262 | 262 |
REGISTER_FILTER(PULLUP, pullup, vf); |
263 | 263 |
REGISTER_FILTER(QP, qp, vf); |
264 | 264 |
REGISTER_FILTER(RANDOM, random, vf); |
265 |
+ REGISTER_FILTER(READEIA608, readeia608, vf); |
|
265 | 266 |
REGISTER_FILTER(READVITC, readvitc, vf); |
266 | 267 |
REGISTER_FILTER(REALTIME, realtime, vf); |
267 | 268 |
REGISTER_FILTER(REMAP, remap, vf); |
... | ... |
@@ -30,7 +30,7 @@ |
30 | 30 |
#include "libavutil/version.h" |
31 | 31 |
|
32 | 32 |
#define LIBAVFILTER_VERSION_MAJOR 6 |
33 |
-#define LIBAVFILTER_VERSION_MINOR 69 |
|
33 |
+#define LIBAVFILTER_VERSION_MINOR 70 |
|
34 | 34 |
#define LIBAVFILTER_VERSION_MICRO 100 |
35 | 35 |
|
36 | 36 |
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \ |
37 | 37 |
new file mode 100644 |
... | ... |
@@ -0,0 +1,268 @@ |
0 |
+/* |
|
1 |
+ * Copyright (c) 2017 Paul B Mahol |
|
2 |
+ * |
|
3 |
+ * This file is part of FFmpeg. |
|
4 |
+ * |
|
5 |
+ * FFmpeg is free software; you can redistribute it and/or |
|
6 |
+ * modify it under the terms of the GNU Lesser General Public |
|
7 |
+ * License as published by the Free Software Foundation; either |
|
8 |
+ * version 2.1 of the License, or (at your option) any later version. |
|
9 |
+ * |
|
10 |
+ * FFmpeg is distributed in the hope that it will be useful, |
|
11 |
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
12 |
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
13 |
+ * Lesser General Public License for more details. |
|
14 |
+ * |
|
15 |
+ * You should have received a copy of the GNU Lesser General Public |
|
16 |
+ * License along with FFmpeg; if not, write to the Free Software |
|
17 |
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
|
18 |
+ */ |
|
19 |
+ |
|
20 |
+/** |
|
21 |
+ * @file |
|
22 |
+ * Filter for reading closed captioning data (EIA-608). |
|
23 |
+ * See also https://en.wikipedia.org/wiki/EIA-608 |
|
24 |
+ */ |
|
25 |
+ |
|
26 |
+#include <string.h> |
|
27 |
+ |
|
28 |
+#include "libavutil/internal.h" |
|
29 |
+#include "libavutil/opt.h" |
|
30 |
+#include "libavutil/pixdesc.h" |
|
31 |
+#include "libavutil/timestamp.h" |
|
32 |
+ |
|
33 |
+#include "avfilter.h" |
|
34 |
+#include "formats.h" |
|
35 |
+#include "internal.h" |
|
36 |
+#include "video.h" |
|
37 |
+ |
|
38 |
+#define FALL 0 |
|
39 |
+#define RISE 1 |
|
40 |
+ |
|
41 |
+typedef struct ReadEIA608Context { |
|
42 |
+ const AVClass *class; |
|
43 |
+ int start, end; |
|
44 |
+ int min_range; |
|
45 |
+ int max_peak_diff; |
|
46 |
+ int max_period_diff; |
|
47 |
+ int max_start_diff; |
|
48 |
+ int nb_found; |
|
49 |
+ int white; |
|
50 |
+ int black; |
|
51 |
+ float mpd, mhd, msd, mac, spw, bhd, wth, bth; |
|
52 |
+ int chp; |
|
53 |
+} ReadEIA608Context; |
|
54 |
+ |
|
55 |
+#define OFFSET(x) offsetof(ReadEIA608Context, x) |
|
56 |
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
|
57 |
+ |
|
58 |
+static const AVOption readeia608_options[] = { |
|
59 |
+ { "scan_min", "set from which line to scan for codes", OFFSET(start), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS }, |
|
60 |
+ { "scan_max", "set to which line to scan for codes", OFFSET(end), AV_OPT_TYPE_INT, {.i64=29}, 0, INT_MAX, FLAGS }, |
|
61 |
+ { "mac", "set minimal acceptable amplitude change for sync codes detection", OFFSET(mac), AV_OPT_TYPE_FLOAT, {.dbl=.2}, 0.001, 1, FLAGS }, |
|
62 |
+ { "spw", "set ratio of width reserved for sync code detection", OFFSET(spw), AV_OPT_TYPE_FLOAT, {.dbl=.27}, 0.1, 0.7, FLAGS }, |
|
63 |
+ { "mhd", "set max peaks height difference for sync code detection", OFFSET(mhd), AV_OPT_TYPE_FLOAT, {.dbl=.1}, 0, 0.5, FLAGS }, |
|
64 |
+ { "mpd", "set max peaks period difference for sync code detection", OFFSET(mpd), AV_OPT_TYPE_FLOAT, {.dbl=.1}, 0, 0.5, FLAGS }, |
|
65 |
+ { "msd", "set first two max start code bits differences", OFFSET(msd), AV_OPT_TYPE_FLOAT, {.dbl=.02}, 0, 0.5, FLAGS }, |
|
66 |
+ { "bhd", "set min ratio of bits height compared to 3rd start code bit", OFFSET(bhd), AV_OPT_TYPE_FLOAT, {.dbl=.75}, 0.01, 1, FLAGS }, |
|
67 |
+ { "th_w", "set white color threshold", OFFSET(wth), AV_OPT_TYPE_FLOAT, {.dbl=.35}, 0.1, 1, FLAGS }, |
|
68 |
+ { "th_b", "set black color threshold", OFFSET(bth), AV_OPT_TYPE_FLOAT, {.dbl=.15}, 0, 0.5, FLAGS }, |
|
69 |
+ { "chp", "check and apply parity bit", OFFSET(chp), AV_OPT_TYPE_BOOL, {.i64= 0}, 0, 1, FLAGS }, |
|
70 |
+ { NULL } |
|
71 |
+}; |
|
72 |
+ |
|
73 |
+AVFILTER_DEFINE_CLASS(readeia608); |
|
74 |
+ |
|
75 |
+static int query_formats(AVFilterContext *ctx) |
|
76 |
+{ |
|
77 |
+ static const enum AVPixelFormat pixel_fmts[] = { |
|
78 |
+ AV_PIX_FMT_GRAY8, |
|
79 |
+ AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P, |
|
80 |
+ AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, |
|
81 |
+ AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P, |
|
82 |
+ AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, |
|
83 |
+ AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P, |
|
84 |
+ AV_PIX_FMT_YUVJ411P, |
|
85 |
+ AV_PIX_FMT_NONE |
|
86 |
+ }; |
|
87 |
+ AVFilterFormats *formats = ff_make_format_list(pixel_fmts); |
|
88 |
+ if (!formats) |
|
89 |
+ return AVERROR(ENOMEM); |
|
90 |
+ return ff_set_common_formats(ctx, formats); |
|
91 |
+} |
|
92 |
+ |
|
93 |
+static int config_input(AVFilterLink *inlink) |
|
94 |
+{ |
|
95 |
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
|
96 |
+ AVFilterContext *ctx = inlink->dst; |
|
97 |
+ ReadEIA608Context *s = ctx->priv; |
|
98 |
+ int depth = desc->comp[0].depth; |
|
99 |
+ |
|
100 |
+ if (s->end >= inlink->h) { |
|
101 |
+ av_log(ctx, AV_LOG_WARNING, "Last line to scan too large, clipping.\n"); |
|
102 |
+ s->end = inlink->h - 1; |
|
103 |
+ } |
|
104 |
+ |
|
105 |
+ if (s->start > s->end) { |
|
106 |
+ av_log(ctx, AV_LOG_ERROR, "Invalid range.\n"); |
|
107 |
+ return AVERROR(EINVAL); |
|
108 |
+ } |
|
109 |
+ |
|
110 |
+ s->min_range = s->mac * ((1 << depth) - 1); |
|
111 |
+ s->max_peak_diff = s->mhd * ((1 << depth) - 1); |
|
112 |
+ s->max_period_diff = s->mpd * ((1 << depth) - 1); |
|
113 |
+ s->max_start_diff = s->msd * ((1 << depth) - 1); |
|
114 |
+ s->white = s->wth * ((1 << depth) - 1); |
|
115 |
+ s->black = s->bth * ((1 << depth) - 1); |
|
116 |
+ |
|
117 |
+ return 0; |
|
118 |
+} |
|
119 |
+ |
|
120 |
+static void extract_line(AVFilterContext *ctx, AVFilterLink *inlink, AVFrame *in, int line) |
|
121 |
+{ |
|
122 |
+ ReadEIA608Context *s = ctx->priv; |
|
123 |
+ int max = 0, min = INT_MAX; |
|
124 |
+ int i, ch, range = 0; |
|
125 |
+ const uint8_t *src; |
|
126 |
+ uint16_t clock[8][2] = { { 0 } }; |
|
127 |
+ const int sync_width = s->spw * in->width; |
|
128 |
+ int last = 0, peaks = 0, max_peak_diff = 0, dir = RISE; |
|
129 |
+ const int width_per_bit = (in->width - sync_width) / 19; |
|
130 |
+ uint8_t byte[2] = { 0 }; |
|
131 |
+ int s1, s2, s3, parity; |
|
132 |
+ |
|
133 |
+ src = &in->data[0][line * in->linesize[0]]; |
|
134 |
+ for (i = 0; i < sync_width; i++) { |
|
135 |
+ max = FFMAX(max, src[i]); |
|
136 |
+ min = FFMIN(min, src[i]); |
|
137 |
+ } |
|
138 |
+ |
|
139 |
+ range = max - min; |
|
140 |
+ if (range < s->min_range) |
|
141 |
+ return; |
|
142 |
+ |
|
143 |
+ for (i = 0; i < sync_width; i++) { |
|
144 |
+ int Y = src[i]; |
|
145 |
+ |
|
146 |
+ if (dir == RISE) { |
|
147 |
+ if (Y < last) { |
|
148 |
+ dir = FALL; |
|
149 |
+ if (last >= s->white) { |
|
150 |
+ clock[peaks][0] = last; |
|
151 |
+ clock[peaks][1] = i; |
|
152 |
+ peaks++; |
|
153 |
+ if (peaks > 7) |
|
154 |
+ break; |
|
155 |
+ } |
|
156 |
+ } |
|
157 |
+ } else if (dir == FALL) { |
|
158 |
+ if (Y > last && last <= s->black) { |
|
159 |
+ dir = RISE; |
|
160 |
+ } |
|
161 |
+ } |
|
162 |
+ last = Y; |
|
163 |
+ } |
|
164 |
+ |
|
165 |
+ if (peaks != 7) |
|
166 |
+ return; |
|
167 |
+ |
|
168 |
+ for (i = 1; i < 7; i++) |
|
169 |
+ max_peak_diff = FFMAX(max_peak_diff, FFABS(clock[i][0] - clock[i-1][0])); |
|
170 |
+ |
|
171 |
+ if (max_peak_diff > s->max_peak_diff) |
|
172 |
+ return; |
|
173 |
+ |
|
174 |
+ max = 0; min = INT_MAX; |
|
175 |
+ for (i = 1; i < 7; i++) { |
|
176 |
+ max = FFMAX(max, FFABS(clock[i][1] - clock[i-1][1])); |
|
177 |
+ min = FFMIN(min, FFABS(clock[i][1] - clock[i-1][1])); |
|
178 |
+ } |
|
179 |
+ |
|
180 |
+ range = max - min; |
|
181 |
+ if (range > s->max_period_diff) |
|
182 |
+ return; |
|
183 |
+ |
|
184 |
+ s1 = src[sync_width + width_per_bit * 0 + width_per_bit / 2]; |
|
185 |
+ s2 = src[sync_width + width_per_bit * 1 + width_per_bit / 2]; |
|
186 |
+ s3 = src[sync_width + width_per_bit * 2 + width_per_bit / 2]; |
|
187 |
+ |
|
188 |
+ if (FFABS(s1 - s2) > s->max_start_diff || s1 > s->black || s2 > s->black || s3 < s->white) |
|
189 |
+ return; |
|
190 |
+ |
|
191 |
+ for (ch = 0; ch < 2; ch++) { |
|
192 |
+ for (parity = 0, i = 0; i < 8; i++) { |
|
193 |
+ int b = src[sync_width + width_per_bit * (i + 3 + 8 * ch) + width_per_bit / 2]; |
|
194 |
+ |
|
195 |
+ if (b - s1 > (s3 - s1) * s->bhd) { |
|
196 |
+ b = 1; |
|
197 |
+ parity++; |
|
198 |
+ } else { |
|
199 |
+ b = 0; |
|
200 |
+ } |
|
201 |
+ byte[ch] |= b << i; |
|
202 |
+ } |
|
203 |
+ |
|
204 |
+ if (s->chp) { |
|
205 |
+ if (!(parity & 1)) { |
|
206 |
+ byte[ch] = 0; |
|
207 |
+ } |
|
208 |
+ } |
|
209 |
+ } |
|
210 |
+ |
|
211 |
+ { |
|
212 |
+ uint8_t key[128], value[128]; |
|
213 |
+ |
|
214 |
+ snprintf(key, sizeof(key), "lavfi.readeia608.%d.cc", s->nb_found); |
|
215 |
+ snprintf(value, sizeof(value), "0x%02X%02X", byte[0], byte[1]); |
|
216 |
+ av_dict_set(avpriv_frame_get_metadatap(in), key, value, 0); |
|
217 |
+ |
|
218 |
+ snprintf(key, sizeof(key), "lavfi.readeia608.%d.line", s->nb_found); |
|
219 |
+ snprintf(value, sizeof(value), "%d", line); |
|
220 |
+ av_dict_set(avpriv_frame_get_metadatap(in), key, value, 0); |
|
221 |
+ } |
|
222 |
+ |
|
223 |
+ s->nb_found++; |
|
224 |
+} |
|
225 |
+ |
|
226 |
+static int filter_frame(AVFilterLink *inlink, AVFrame *in) |
|
227 |
+{ |
|
228 |
+ AVFilterContext *ctx = inlink->dst; |
|
229 |
+ AVFilterLink *outlink = ctx->outputs[0]; |
|
230 |
+ ReadEIA608Context *s = ctx->priv; |
|
231 |
+ int i; |
|
232 |
+ |
|
233 |
+ s->nb_found = 0; |
|
234 |
+ for (i = s->start; i <= s->end; i++) |
|
235 |
+ extract_line(ctx, inlink, in, i); |
|
236 |
+ |
|
237 |
+ return ff_filter_frame(outlink, in); |
|
238 |
+} |
|
239 |
+ |
|
240 |
+static const AVFilterPad readeia608_inputs[] = { |
|
241 |
+ { |
|
242 |
+ .name = "default", |
|
243 |
+ .type = AVMEDIA_TYPE_VIDEO, |
|
244 |
+ .filter_frame = filter_frame, |
|
245 |
+ .config_props = config_input, |
|
246 |
+ }, |
|
247 |
+ { NULL } |
|
248 |
+}; |
|
249 |
+ |
|
250 |
+static const AVFilterPad readeia608_outputs[] = { |
|
251 |
+ { |
|
252 |
+ .name = "default", |
|
253 |
+ .type = AVMEDIA_TYPE_VIDEO, |
|
254 |
+ }, |
|
255 |
+ { NULL } |
|
256 |
+}; |
|
257 |
+ |
|
258 |
+AVFilter ff_vf_readeia608 = { |
|
259 |
+ .name = "readeia608", |
|
260 |
+ .description = NULL_IF_CONFIG_SMALL("Read EIA-608 Closed Caption codes from input video and write them to frame metadata."), |
|
261 |
+ .priv_size = sizeof(ReadEIA608Context), |
|
262 |
+ .priv_class = &readeia608_class, |
|
263 |
+ .query_formats = query_formats, |
|
264 |
+ .inputs = readeia608_inputs, |
|
265 |
+ .outputs = readeia608_outputs, |
|
266 |
+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
|
267 |
+}; |