FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/webmdashenc.c
Date: 2024-11-20 23:03:26
Exec Total Coverage
Lines: 263 295 89.2%
Functions: 15 16 93.8%
Branches: 179 232 77.2%
Line Branch Exec Source
1 /*
2 * WebM DASH Manifest XML muxer
3 * Copyright (c) 2014 Vignesh Venkatasubramanian
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /*
23 * WebM DASH Specification:
24 * https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification
25 * ISO DASH Specification:
26 * http://standards.iso.org/ittf/PubliclyAvailableStandards/c065274_ISO_IEC_23009-1_2014.zip
27 */
28
29 #include <float.h>
30 #include <stdint.h>
31 #include <string.h>
32 #include <time.h>
33
34 #include "avformat.h"
35 #include "matroska.h"
36 #include "mux.h"
37
38 #include "libavutil/avstring.h"
39 #include "libavutil/dict.h"
40 #include "libavutil/mem.h"
41 #include "libavutil/opt.h"
42 #include "libavutil/time_internal.h"
43
44 #include "libavcodec/codec_desc.h"
45
46 typedef struct AdaptationSet {
47 char id[10];
48 int *streams;
49 int nb_streams;
50 } AdaptationSet;
51
52 typedef struct WebMDashMuxContext {
53 const AVClass *class;
54 char *adaptation_sets;
55 AdaptationSet *as;
56 int nb_as;
57 int representation_id;
58 int is_live;
59 int chunk_start_index;
60 int chunk_duration;
61 char *utc_timing_url;
62 double time_shift_buffer_depth;
63 int minimum_update_period;
64 } WebMDashMuxContext;
65
66 13 static const char *get_codec_name(int codec_id)
67 {
68 13 return avcodec_descriptor_get(codec_id)->name;
69 }
70
71 8 static double get_duration(AVFormatContext *s)
72 {
73 8 int i = 0;
74 8 double max = 0.0;
75
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 28 for (i = 0; i < s->nb_streams; i++) {
76 20 AVDictionaryEntry *duration = av_dict_get(s->streams[i]->metadata,
77 DURATION, NULL, 0);
78
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 20 if (!duration || atof(duration->value) < 0) continue;
79
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 20 if (atof(duration->value) > max) max = atof(duration->value);
80 }
81 8 return max / 1000;
82 }
83
84 6 static int write_header(AVFormatContext *s)
85 {
86 6 WebMDashMuxContext *w = s->priv_data;
87 6 AVIOContext *pb = s->pb;
88 6 double min_buffer_time = 1.0;
89 6 avio_printf(pb, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
90 6 avio_printf(pb, "<MPD\n");
91 6 avio_printf(pb, " xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n");
92 6 avio_printf(pb, " xmlns=\"urn:mpeg:DASH:schema:MPD:2011\"\n");
93 6 avio_printf(pb, " xsi:schemaLocation=\"urn:mpeg:DASH:schema:MPD:2011\"\n");
94
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 6 avio_printf(pb, " type=\"%s\"\n", w->is_live ? "dynamic" : "static");
95
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 6 if (!w->is_live) {
96 4 avio_printf(pb, " mediaPresentationDuration=\"PT%gS\"\n",
97 get_duration(s));
98 }
99 6 avio_printf(pb, " minBufferTime=\"PT%gS\"\n", min_buffer_time);
100 12 avio_printf(pb, " profiles=\"%s\"%s",
101
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 6 w->is_live ? "urn:mpeg:dash:profile:isoff-live:2011" : "urn:mpeg:dash:profile:webm-on-demand:2012",
102
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 6 w->is_live ? "\n" : ">\n");
103
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 6 if (w->is_live) {
104 2 time_t local_time = time(NULL);
105 struct tm gmt_buffer;
106 2 struct tm *gmt = gmtime_r(&local_time, &gmt_buffer);
107 char gmt_iso[21];
108
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 2 if (!strftime(gmt_iso, 21, "%Y-%m-%dT%H:%M:%SZ", gmt)) {
109 ✗ return AVERROR_UNKNOWN;
110 }
111
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 2 if (s->flags & AVFMT_FLAG_BITEXACT) {
112 2 av_strlcpy(gmt_iso, "", 1);
113 }
114 2 avio_printf(pb, " availabilityStartTime=\"%s\"\n", gmt_iso);
115 2 avio_printf(pb, " timeShiftBufferDepth=\"PT%gS\"\n", w->time_shift_buffer_depth);
116 2 avio_printf(pb, " minimumUpdatePeriod=\"PT%dS\"", w->minimum_update_period);
117 2 avio_printf(pb, ">\n");
118
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 2 if (w->utc_timing_url) {
119 ✗ avio_printf(pb, "<UTCTiming\n");
120 ✗ avio_printf(pb, " schemeIdUri=\"urn:mpeg:dash:utc:http-iso:2014\"\n");
121 ✗ avio_printf(pb, " value=\"%s\"/>\n", w->utc_timing_url);
122 }
123 }
124 6 return 0;
125 }
126
127 6 static void write_footer(AVFormatContext *s)
128 {
129 6 avio_printf(s->pb, "</MPD>\n");
130 6 }
131
132 5 static int subsegment_alignment(AVFormatContext *s, const AdaptationSet *as)
133 {
134 int i;
135 5 AVDictionaryEntry *gold = av_dict_get(s->streams[as->streams[0]]->metadata,
136 CUE_TIMESTAMPS, NULL, 0);
137
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 5 if (!gold) return 0;
138
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 6 for (i = 1; i < as->nb_streams; i++) {
139 5 AVDictionaryEntry *ts = av_dict_get(s->streams[as->streams[i]]->metadata,
140 CUE_TIMESTAMPS, NULL, 0);
141
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 5 if (!ts || !av_strstart(ts->value, gold->value, NULL)) return 0;
142 }
143 1 return 1;
144 }
145
146 9 static int bitstream_switching(AVFormatContext *s, const AdaptationSet *as)
147 {
148 int i;
149 9 const AVStream *gold_st = s->streams[as->streams[0]];
150 9 AVDictionaryEntry *gold_track_num = av_dict_get(gold_st->metadata,
151 TRACK_NUMBER, NULL, 0);
152 9 AVCodecParameters *gold_par = gold_st->codecpar;
153
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 9 if (!gold_track_num) return 0;
154
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 13 for (i = 1; i < as->nb_streams; i++) {
155 5 const AVStream *st = s->streams[as->streams[i]];
156 5 AVDictionaryEntry *track_num = av_dict_get(st->metadata,
157 TRACK_NUMBER, NULL, 0);
158 5 AVCodecParameters *par = st->codecpar;
159
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 10 if (!track_num ||
160 5 !av_strstart(track_num->value, gold_track_num->value, NULL) ||
161
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 4 gold_par->codec_id != par->codec_id ||
162
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 4 gold_par->extradata_size != par->extradata_size ||
163
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 4 (par->extradata_size > 0 &&
164
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 1 memcmp(gold_par->extradata, par->extradata, par->extradata_size))) {
165 1 return 0;
166 }
167 }
168 8 return 1;
169 }
170
171 /*
172 * Writes a Representation within an Adaptation Set. Returns 0 on success and
173 * < 0 on failure.
174 */
175 14 static int write_representation(AVFormatContext *s, AVStream *st, char *id,
176 int output_width, int output_height,
177 int output_sample_rate)
178 {
179 14 WebMDashMuxContext *w = s->priv_data;
180 14 AVIOContext *pb = s->pb;
181 14 const AVCodecParameters *par = st->codecpar;
182 14 AVDictionaryEntry *bandwidth = av_dict_get(st->metadata, BANDWIDTH, NULL, 0);
183 const char *bandwidth_str;
184 14 avio_printf(pb, "<Representation id=\"%s\"", id);
185
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 14 if (bandwidth) {
186 12 bandwidth_str = bandwidth->value;
187
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 2 } else if (w->is_live) {
188 // if bandwidth for live was not provided, use a default
189
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 2 bandwidth_str = (par->codec_type == AVMEDIA_TYPE_AUDIO) ? "128000" : "1000000";
190 } else {
191 ✗ return AVERROR(EINVAL);
192 }
193 14 avio_printf(pb, " bandwidth=\"%s\"", bandwidth_str);
194
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 14 if (par->codec_type == AVMEDIA_TYPE_VIDEO && output_width)
195 4 avio_printf(pb, " width=\"%d\"", par->width);
196
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 14 if (par->codec_type == AVMEDIA_TYPE_VIDEO && output_height)
197 4 avio_printf(pb, " height=\"%d\"", par->height);
198
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 14 if (par->codec_type == AVMEDIA_TYPE_AUDIO && output_sample_rate)
199 2 avio_printf(pb, " audioSamplingRate=\"%d\"", par->sample_rate);
200
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 14 if (w->is_live) {
201 // For live streams, Codec and Mime Type always go in the Representation tag.
202 4 avio_printf(pb, " codecs=\"%s\"", get_codec_name(par->codec_id));
203 4 avio_printf(pb, " mimeType=\"%s/webm\"",
204
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 4 par->codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
205 // For live streams, subsegments always start with key frames. So this
206 // is always 1.
207 4 avio_printf(pb, " startsWithSAP=\"1\"");
208 4 avio_printf(pb, ">");
209 } else {
210 10 AVDictionaryEntry *irange = av_dict_get(st->metadata, INITIALIZATION_RANGE, NULL, 0);
211 10 AVDictionaryEntry *cues_start = av_dict_get(st->metadata, CUES_START, NULL, 0);
212 10 AVDictionaryEntry *cues_end = av_dict_get(st->metadata, CUES_END, NULL, 0);
213 10 AVDictionaryEntry *filename = av_dict_get(st->metadata, FILENAME, NULL, 0);
214
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 10 if (!irange || !cues_start || !cues_end || !filename)
215 ✗ return AVERROR(EINVAL);
216
217 10 avio_printf(pb, ">\n");
218 10 avio_printf(pb, "<BaseURL>%s</BaseURL>\n", filename->value);
219 10 avio_printf(pb, "<SegmentBase\n");
220 10 avio_printf(pb, " indexRange=\"%s-%s\">\n", cues_start->value, cues_end->value);
221 10 avio_printf(pb, "<Initialization\n");
222 10 avio_printf(pb, " range=\"0-%s\" />\n", irange->value);
223 10 avio_printf(pb, "</SegmentBase>\n");
224 }
225 14 avio_printf(pb, "</Representation>\n");
226 14 return 0;
227 }
228
229 /*
230 * Checks if width of all streams are the same. Returns 1 if true, 0 otherwise.
231 */
232 3 static int check_matching_width(AVFormatContext *s, const AdaptationSet *as)
233 {
234 int first_width, i;
235
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 3 if (as->nb_streams < 2) return 1;
236 3 first_width = s->streams[as->streams[0]]->codecpar->width;
237
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 5 for (i = 1; i < as->nb_streams; i++)
238
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 3 if (first_width != s->streams[as->streams[i]]->codecpar->width)
239 1 return 0;
240 2 return 1;
241 }
242
243 /*
244 * Checks if height of all streams are the same. Returns 1 if true, 0 otherwise.
245 */
246 3 static int check_matching_height(AVFormatContext *s, const AdaptationSet *as)
247 {
248 int first_height, i;
249
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 3 if (as->nb_streams < 2) return 1;
250 3 first_height = s->streams[as->streams[0]]->codecpar->height;
251
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252
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 3 if (first_height != s->streams[as->streams[i]]->codecpar->height)
253 1 return 0;
254 2 return 1;
255 }
256
257 /*
258 * Checks if sample rate of all streams are the same. Returns 1 if true, 0 otherwise.
259 */
260 2 static int check_matching_sample_rate(AVFormatContext *s, const AdaptationSet *as)
261 {
262 int first_sample_rate, i;
263
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 2 if (as->nb_streams < 2) return 1;
264 2 first_sample_rate = s->streams[as->streams[0]]->codecpar->sample_rate;
265
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 4 for (i = 1; i < as->nb_streams; i++)
266
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 2 if (first_sample_rate != s->streams[as->streams[i]]->codecpar->sample_rate)
267 ✗ return 0;
268 2 return 1;
269 }
270
271 6 static void free_adaptation_sets(AVFormatContext *s)
272 {
273 6 WebMDashMuxContext *w = s->priv_data;
274 int i;
275
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 15 for (i = 0; i < w->nb_as; i++) {
276 9 av_freep(&w->as[i].streams);
277 }
278 6 av_freep(&w->as);
279 6 w->nb_as = 0;
280 6 }
281
282 /*
283 * Parses a live header filename and returns the position of the '_' and '.'
284 * delimiting <file_description> and <representation_id>.
285 *
286 * Name of the header file should conform to the following pattern:
287 * <file_description>_<representation_id>.hdr where <file_description> can be
288 * anything. The chunks should be named according to the following pattern:
289 * <file_description>_<representation_id>_<chunk_number>.chk
290 */
291 8 static int split_filename(char *filename, char **underscore_pos,
292 char **period_pos)
293 {
294 8 *underscore_pos = strrchr(filename, '_');
295
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 8 if (!*underscore_pos)
296 ✗ return AVERROR(EINVAL);
297 8 *period_pos = strchr(*underscore_pos, '.');
298
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 8 if (!*period_pos)
299 ✗ return AVERROR(EINVAL);
300 8 return 0;
301 }
302
303 /*
304 * Writes an Adaptation Set. Returns 0 on success and < 0 on failure.
305 */
306 9 static int write_adaptation_set(AVFormatContext *s, int as_index)
307 {
308 9 WebMDashMuxContext *w = s->priv_data;
309 9 AdaptationSet *as = &w->as[as_index];
310 9 const AVStream *st = s->streams[as->streams[0]];
311 9 AVCodecParameters *par = st->codecpar;
312 AVDictionaryEntry *lang;
313 9 AVIOContext *pb = s->pb;
314 int i;
315 static const char boolean[2][6] = { "false", "true" };
316 9 int subsegmentStartsWithSAP = 1;
317
318 // Width, Height and Sample Rate will go in the AdaptationSet tag if they
319 // are the same for all contained Representations. otherwise, they will go
320 // on their respective Representation tag. For live streams, they always go
321 // in the Representation tag.
322 9 int width_in_as = 1, height_in_as = 1, sample_rate_in_as = 1;
323
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 9 if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
324
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 5 width_in_as = !w->is_live && check_matching_width (s, as);
325
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 5 height_in_as = !w->is_live && check_matching_height(s, as);
326 } else {
327
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 4 sample_rate_in_as = !w->is_live && check_matching_sample_rate(s, as);
328 }
329
330 9 avio_printf(pb, "<AdaptationSet id=\"%s\"", as->id);
331 9 avio_printf(pb, " mimeType=\"%s/webm\"",
332
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 9 par->codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
333 9 avio_printf(pb, " codecs=\"%s\"", get_codec_name(par->codec_id));
334
335 9 lang = av_dict_get(st->metadata, "language", NULL, 0);
336
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 9 if (lang)
337 5 avio_printf(pb, " lang=\"%s\"", lang->value);
338
339
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 9 if (par->codec_type == AVMEDIA_TYPE_VIDEO && width_in_as)
340 2 avio_printf(pb, " width=\"%d\"", par->width);
341
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 9 if (par->codec_type == AVMEDIA_TYPE_VIDEO && height_in_as)
342 2 avio_printf(pb, " height=\"%d\"", par->height);
343
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 9 if (par->codec_type == AVMEDIA_TYPE_AUDIO && sample_rate_in_as)
344 2 avio_printf(pb, " audioSamplingRate=\"%d\"", par->sample_rate);
345
346 9 avio_printf(pb, " bitstreamSwitching=\"%s\"",
347 9 boolean[bitstream_switching(s, as)]);
348 9 avio_printf(pb, " subsegmentAlignment=\"%s\"",
349
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 9 boolean[w->is_live || subsegment_alignment(s, as)]);
350
351
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 23 for (i = 0; i < as->nb_streams; i++) {
352 14 AVDictionaryEntry *kf = av_dict_get(s->streams[as->streams[i]]->metadata,
353 CLUSTER_KEYFRAME, NULL, 0);
354
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 14 if (!w->is_live && (!kf || !strncmp(kf->value, "0", 1))) subsegmentStartsWithSAP = 0;
355 }
356 9 avio_printf(pb, " subsegmentStartsWithSAP=\"%d\"", subsegmentStartsWithSAP);
357 9 avio_printf(pb, ">\n");
358
359
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 9 if (w->is_live) {
360 AVDictionaryEntry *filename =
361 4 av_dict_get(st->metadata, FILENAME, NULL, 0);
362 char *underscore_pos, *period_pos;
363 int ret;
364
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 4 if (!filename)
365 ✗ return AVERROR(EINVAL);
366 4 ret = split_filename(filename->value, &underscore_pos, &period_pos);
367
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 4 if (ret) return ret;
368 4 *underscore_pos = '\0';
369 4 avio_printf(pb, "<ContentComponent id=\"1\" type=\"%s\"/>\n",
370
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 4 par->codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
371 4 avio_printf(pb, "<SegmentTemplate");
372 4 avio_printf(pb, " timescale=\"1000\"");
373 4 avio_printf(pb, " duration=\"%d\"", w->chunk_duration);
374 4 avio_printf(pb, " media=\"%s_$RepresentationID$_$Number$.chk\"",
375 filename->value);
376 4 avio_printf(pb, " startNumber=\"%d\"", w->chunk_start_index);
377 4 avio_printf(pb, " initialization=\"%s_$RepresentationID$.hdr\"",
378 filename->value);
379 4 avio_printf(pb, "/>\n");
380 4 *underscore_pos = '_';
381 }
382
383
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 23 for (i = 0; i < as->nb_streams; i++) {
384 14 char buf[25], *representation_id = buf, *underscore_pos, *period_pos;
385 14 AVStream *st = s->streams[as->streams[i]];
386 int ret;
387
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 14 if (w->is_live) {
388 AVDictionaryEntry *filename =
389 4 av_dict_get(st->metadata, FILENAME, NULL, 0);
390
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 4 if (!filename)
391 ✗ return AVERROR(EINVAL);
392 4 ret = split_filename(filename->value, &underscore_pos, &period_pos);
393
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 4 if (ret < 0)
394 ✗ return ret;
395 4 representation_id = underscore_pos + 1;
396 4 *period_pos = '\0';
397 } else {
398 10 snprintf(buf, sizeof(buf), "%d", w->representation_id++);
399 }
400 14 ret = write_representation(s, st, representation_id, !width_in_as,
401 !height_in_as, !sample_rate_in_as);
402
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 14 if (ret) return ret;
403
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 14 if (w->is_live)
404 4 *period_pos = '.';
405 }
406 9 avio_printf(s->pb, "</AdaptationSet>\n");
407 9 return 0;
408 }
409
410 6 static int parse_adaptation_sets(AVFormatContext *s)
411 {
412 6 WebMDashMuxContext *w = s->priv_data;
413 6 char *p = w->adaptation_sets;
414 char *q;
415 enum { new_set, parsed_id, parsing_streams } state;
416
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 6 if (!w->adaptation_sets) {
417 ✗ av_log(s, AV_LOG_ERROR, "The 'adaptation_sets' option must be set.\n");
418 ✗ return AVERROR(EINVAL);
419 }
420 // syntax id=0,streams=0,1,2 id=1,streams=3,4 and so on
421 6 state = new_set;
422 while (1) {
423
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 32 if (*p == '\0') {
424 ✗ if (state == new_set)
425 ✗ break;
426 else
427 ✗ return AVERROR(EINVAL);
428
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 32 } else if (state == new_set && *p == ' ') {
429 ✗ p++;
430 ✗ continue;
431
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 32 } else if (state == new_set && !strncmp(p, "id=", 3)) {
432 9 void *mem = av_realloc(w->as, sizeof(*w->as) * (w->nb_as + 1));
433 const char *comma;
434
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 9 if (mem == NULL)
435 ✗ return AVERROR(ENOMEM);
436 9 w->as = mem;
437 9 ++w->nb_as;
438 9 w->as[w->nb_as - 1].nb_streams = 0;
439 9 w->as[w->nb_as - 1].streams = NULL;
440 9 p += 3; // consume "id="
441 9 q = w->as[w->nb_as - 1].id;
442 9 comma = strchr(p, ',');
443
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 9 if (!comma || comma - p >= sizeof(w->as[w->nb_as - 1].id)) {
444 ✗ av_log(s, AV_LOG_ERROR, "'id' in 'adaptation_sets' is malformed.\n");
445 ✗ return AVERROR(EINVAL);
446 }
447
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 18 while (*p != ',') *q++ = *p++;
448 9 *q = 0;
449 9 p++;
450 9 state = parsed_id;
451
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 23 } else if (state == parsed_id && !strncmp(p, "streams=", 8)) {
452 9 p += 8; // consume "streams="
453 9 state = parsing_streams;
454
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 14 } else if (state == parsing_streams) {
455 14 struct AdaptationSet *as = &w->as[w->nb_as - 1];
456 int64_t num;
457 14 int ret = av_reallocp_array(&as->streams, ++as->nb_streams,
458 sizeof(*as->streams));
459
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 14 if (ret < 0)
460 ✗ return ret;
461 14 num = strtoll(p, &q, 10);
462
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 14 if (!av_isdigit(*p) || (*q != ' ' && *q != '\0' && *q != ',') ||
463
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 14 num < 0 || num >= s->nb_streams) {
464 ✗ av_log(s, AV_LOG_ERROR, "Invalid value for 'streams' in adapation_sets.\n");
465 ✗ return AVERROR(EINVAL);
466 }
467 14 as->streams[as->nb_streams - 1] = num;
468
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 14 if (*q == '\0') break;
469
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 8 if (*q == ' ') state = new_set;
470 8 p = ++q;
471 } else {
472 ✗ return -1;
473 }
474 }
475 6 return 0;
476 }
477
478 6 static int webm_dash_manifest_write_header(AVFormatContext *s)
479 {
480 int i;
481 6 double start = 0.0;
482 int ret;
483 6 WebMDashMuxContext *w = s->priv_data;
484
485
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 20 for (unsigned i = 0; i < s->nb_streams; i++) {
486 14 enum AVCodecID codec_id = s->streams[i]->codecpar->codec_id;
487
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 14 if (codec_id != AV_CODEC_ID_VP8 && codec_id != AV_CODEC_ID_VP9 &&
488
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 6 codec_id != AV_CODEC_ID_AV1 && codec_id != AV_CODEC_ID_VORBIS &&
489 codec_id != AV_CODEC_ID_OPUS)
490 ✗ return AVERROR(EINVAL);
491 }
492
493 6 ret = parse_adaptation_sets(s);
494
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 6 if (ret < 0) {
495 ✗ goto fail;
496 }
497 6 ret = write_header(s);
498
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 6 if (ret < 0) {
499 ✗ goto fail;
500 }
501 6 avio_printf(s->pb, "<Period id=\"0\"");
502 6 avio_printf(s->pb, " start=\"PT%gS\"", start);
503
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 6 if (!w->is_live) {
504 4 avio_printf(s->pb, " duration=\"PT%gS\"", get_duration(s));
505 }
506 6 avio_printf(s->pb, " >\n");
507
508
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 15 for (i = 0; i < w->nb_as; i++) {
509 9 ret = write_adaptation_set(s, i);
510
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 9 if (ret < 0) {
511 ✗ goto fail;
512 }
513 }
514
515 6 avio_printf(s->pb, "</Period>\n");
516 6 write_footer(s);
517 6 fail:
518 6 free_adaptation_sets(s);
519 6 return ret < 0 ? ret : 0;
520 }
521
522 ✗ static int webm_dash_manifest_write_packet(AVFormatContext *s, AVPacket *pkt)
523 {
524 ✗ return AVERROR_EOF;
525 }
526
527 #define OFFSET(x) offsetof(WebMDashMuxContext, x)
528 static const AVOption options[] = {
529 { "adaptation_sets", "Adaptation sets. Syntax: id=0,streams=0,1,2 id=1,streams=3,4 and so on", OFFSET(adaptation_sets), AV_OPT_TYPE_STRING, { 0 }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
530 { "live", "create a live stream manifest", OFFSET(is_live), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
531 { "chunk_start_index", "start index of the chunk", OFFSET(chunk_start_index), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
532 { "chunk_duration_ms", "duration of each chunk (in milliseconds)", OFFSET(chunk_duration), AV_OPT_TYPE_INT, {.i64 = 1000}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
533 { "utc_timing_url", "URL of the page that will return the UTC timestamp in ISO format", OFFSET(utc_timing_url), AV_OPT_TYPE_STRING, { 0 }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
534 { "time_shift_buffer_depth", "Smallest time (in seconds) shifting buffer for which any Representation is guaranteed to be available.", OFFSET(time_shift_buffer_depth), AV_OPT_TYPE_DOUBLE, { .dbl = 60.0 }, 1.0, DBL_MAX, AV_OPT_FLAG_ENCODING_PARAM },
535 { "minimum_update_period", "Minimum Update Period (in seconds) of the manifest.", OFFSET(minimum_update_period), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
536 { NULL },
537 };
538
539 static const AVClass webm_dash_class = {
540 .class_name = "WebM DASH Manifest muxer",
541 .item_name = av_default_item_name,
542 .option = options,
543 .version = LIBAVUTIL_VERSION_INT,
544 };
545
546 const FFOutputFormat ff_webm_dash_manifest_muxer = {
547 .p.name = "webm_dash_manifest",
548 .p.long_name = NULL_IF_CONFIG_SMALL("WebM DASH Manifest"),
549 .p.mime_type = "application/xml",
550 .p.extensions = "xml",
551 .priv_data_size = sizeof(WebMDashMuxContext),
552 .write_header = webm_dash_manifest_write_header,
553 .write_packet = webm_dash_manifest_write_packet,
554 .p.priv_class = &webm_dash_class,
555 };
556