2 * WebM DASH Manifest XML muxer
3 * Copyright (c) 2014 Vignesh Venkatasubramanian
5 * This file is part of FFmpeg.
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.
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.
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
23 * WebM DASH Specification:
24 * https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification
31 #include "avio_internal.h"
34 #include "libavutil/avstring.h"
35 #include "libavutil/dict.h"
36 #include "libavutil/opt.h"
38 typedef struct AdaptationSet {
44 typedef struct WebMDashMuxContext {
46 char *adaptation_sets;
51 static const char *get_codec_name(int codec_id)
58 case AV_CODEC_ID_VORBIS:
60 case AV_CODEC_ID_OPUS:
66 static double get_duration(AVFormatContext *s)
70 for (i = 0; i < s->nb_streams; i++) {
71 AVDictionaryEntry *duration = av_dict_get(s->streams[i]->metadata,
73 if (duration == NULL || atof(duration->value) < 0) continue;
74 if (atof(duration->value) > max) max = atof(duration->value);
79 static void write_header(AVFormatContext *s)
81 double min_buffer_time = 1.0;
82 avio_printf(s->pb, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
83 avio_printf(s->pb, "<MPD\n");
84 avio_printf(s->pb, " xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n");
85 avio_printf(s->pb, " xmlns=\"urn:mpeg:DASH:schema:MPD:2011\"\n");
86 avio_printf(s->pb, " xsi:schemaLocation=\"urn:mpeg:DASH:schema:MPD:2011\"\n");
87 avio_printf(s->pb, " type=\"static\"\n");
88 avio_printf(s->pb, " mediaPresentationDuration=\"PT%gS\"\n",
90 avio_printf(s->pb, " minBufferTime=\"PT%gS\"\n",
92 avio_printf(s->pb, " profiles=\"urn:webm:dash:profile:webm-on-demand:2012\"");
93 avio_printf(s->pb, ">\n");
96 static void write_footer(AVFormatContext *s)
98 avio_printf(s->pb, "</MPD>");
101 static int subsegment_alignment(AVFormatContext *s, AdaptationSet *as) {
103 AVDictionaryEntry *gold = av_dict_get(s->streams[as->streams[0]]->metadata,
104 CUE_TIMESTAMPS, NULL, 0);
105 if (gold == NULL) return 0;
106 for (i = 1; i < as->nb_streams; i++) {
107 AVDictionaryEntry *ts = av_dict_get(s->streams[as->streams[i]]->metadata,
108 CUE_TIMESTAMPS, NULL, 0);
109 if (ts == NULL || strncmp(gold->value, ts->value, strlen(gold->value))) return 0;
114 static int bitstream_switching(AVFormatContext *s, AdaptationSet *as) {
116 AVDictionaryEntry *gold_track_num = av_dict_get(s->streams[as->streams[0]]->metadata,
117 TRACK_NUMBER, NULL, 0);
118 AVCodecContext *gold_codec = s->streams[as->streams[0]]->codec;
119 if (gold_track_num == NULL) return 0;
120 for (i = 1; i < as->nb_streams; i++) {
121 AVDictionaryEntry *track_num = av_dict_get(s->streams[as->streams[i]]->metadata,
122 TRACK_NUMBER, NULL, 0);
123 AVCodecContext *codec = s->streams[as->streams[i]]->codec;
124 if (track_num == NULL ||
125 strncmp(gold_track_num->value, track_num->value, strlen(gold_track_num->value)) ||
126 gold_codec->codec_id != codec->codec_id ||
127 gold_codec->extradata_size != codec->extradata_size ||
128 memcmp(gold_codec->extradata, codec->extradata, codec->extradata_size)) {
136 * Writes an Adaptation Set. Returns 0 on success and < 0 on failure.
138 static int write_adaptation_set(AVFormatContext *s, int as_index)
140 WebMDashMuxContext *w = s->priv_data;
141 AdaptationSet *as = &w->as[as_index];
142 AVCodecContext *codec = s->streams[as->streams[0]]->codec;
144 static const char boolean[2][6] = { "false", "true" };
145 int subsegmentStartsWithSAP = 1;
146 AVDictionaryEntry *lang;
147 avio_printf(s->pb, "<AdaptationSet id=\"%s\"", as->id);
148 avio_printf(s->pb, " mimeType=\"%s/webm\"",
149 codec->codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
150 avio_printf(s->pb, " codecs=\"%s\"", get_codec_name(codec->codec_id));
152 lang = av_dict_get(s->streams[as->streams[0]]->metadata, "language", NULL, 0);
153 if (lang != NULL) avio_printf(s->pb, " lang=\"%s\"", lang->value);
155 if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
156 avio_printf(s->pb, " width=\"%d\"", codec->width);
157 avio_printf(s->pb, " height=\"%d\"", codec->height);
159 avio_printf(s->pb, " audioSamplingRate=\"%d\"", codec->sample_rate);
162 avio_printf(s->pb, " bitstreamSwitching=\"%s\"",
163 boolean[bitstream_switching(s, as)]);
164 avio_printf(s->pb, " subsegmentAlignment=\"%s\"",
165 boolean[subsegment_alignment(s, as)]);
167 for (i = 0; i < as->nb_streams; i++) {
168 AVDictionaryEntry *kf = av_dict_get(s->streams[as->streams[i]]->metadata,
169 CLUSTER_KEYFRAME, NULL, 0);
170 if (kf == NULL || !strncmp(kf->value, "0", 1)) subsegmentStartsWithSAP = 0;
172 avio_printf(s->pb, " subsegmentStartsWithSAP=\"%d\"", subsegmentStartsWithSAP);
173 avio_printf(s->pb, ">\n");
175 for (i = 0; i < as->nb_streams; i++) {
176 AVStream *stream = s->streams[as->streams[i]];
177 AVDictionaryEntry *irange = av_dict_get(stream->metadata, INITIALIZATION_RANGE, NULL, 0);
178 AVDictionaryEntry *cues_start = av_dict_get(stream->metadata, CUES_START, NULL, 0);
179 AVDictionaryEntry *cues_end = av_dict_get(stream->metadata, CUES_END, NULL, 0);
180 AVDictionaryEntry *filename = av_dict_get(stream->metadata, FILENAME, NULL, 0);
181 AVDictionaryEntry *bandwidth = av_dict_get(stream->metadata, BANDWIDTH, NULL, 0);
182 if (irange == NULL || cues_start == NULL || cues_end == NULL || filename == NULL ||
186 avio_printf(s->pb, "<Representation id=\"%d\"", i);
187 avio_printf(s->pb, " bandwidth=\"%s\"", bandwidth->value);
188 avio_printf(s->pb, ">\n");
189 avio_printf(s->pb, "<BaseURL>%s</BaseURL>\n", filename->value);
190 avio_printf(s->pb, "<SegmentBase\n");
191 avio_printf(s->pb, " indexRange=\"%s-%s\">\n", cues_start->value, cues_end->value);
192 avio_printf(s->pb, "<Initialization\n");
193 avio_printf(s->pb, " range=\"0-%s\" />\n", irange->value);
194 avio_printf(s->pb, "</SegmentBase>\n");
195 avio_printf(s->pb, "</Representation>\n");
197 avio_printf(s->pb, "</AdaptationSet>\n");
201 static int to_integer(char *p, int len)
204 char *q = av_malloc(sizeof(char) * len);
205 if (q == NULL) return -1;
212 static int parse_adaptation_sets(AVFormatContext *s)
214 WebMDashMuxContext *w = s->priv_data;
215 char *p = w->adaptation_sets;
217 enum { new_set, parsed_id, parsing_streams } state;
218 // syntax id=0,streams=0,1,2 id=1,streams=3,4 and so on
220 while (p < w->adaptation_sets + strlen(w->adaptation_sets)) {
223 else if (state == new_set && !strncmp(p, "id=", 3)) {
224 w->as = av_realloc(w->as, sizeof(*w->as) * ++w->nb_as);
225 if (w->as == NULL) return -1;
226 w->as[w->nb_as - 1].nb_streams = 0;
227 w->as[w->nb_as - 1].streams = NULL;
228 p += 3; // consume "id="
229 q = w->as[w->nb_as - 1].id;
230 while (*p != ',') *q++ = *p++;
234 } else if (state == parsed_id && !strncmp(p, "streams=", 8)) {
235 p += 8; // consume "streams="
236 state = parsing_streams;
237 } else if (state == parsing_streams) {
238 struct AdaptationSet *as = &w->as[w->nb_as - 1];
240 while (*q != '\0' && *q != ',' && *q != ' ') q++;
241 as->streams = av_realloc(as->streams, sizeof(*as->streams) * ++as->nb_streams);
242 if (as->streams == NULL) return -1;
243 as->streams[as->nb_streams - 1] = to_integer(p, q - p);
244 if (as->streams[as->nb_streams - 1] < 0) return -1;
245 if (*q == '\0') break;
246 if (*q == ' ') state = new_set;
255 static int webm_dash_manifest_write_header(AVFormatContext *s)
259 WebMDashMuxContext *w = s->priv_data;
260 parse_adaptation_sets(s);
262 avio_printf(s->pb, "<Period id=\"0\"");
263 avio_printf(s->pb, " start=\"PT%gS\"", start);
264 avio_printf(s->pb, " duration=\"PT%gS\"", get_duration(s));
265 avio_printf(s->pb, " >\n");
267 for (i = 0; i < w->nb_as; i++) {
268 if (write_adaptation_set(s, i) < 0) return -1;
271 avio_printf(s->pb, "</Period>\n");
276 static int webm_dash_manifest_write_packet(AVFormatContext *s, AVPacket *pkt)
281 static int webm_dash_manifest_write_trailer(AVFormatContext *s)
283 WebMDashMuxContext *w = s->priv_data;
285 for (i = 0; i < w->nb_as; i++) {
286 av_freep(&w->as[i].streams);
292 #define OFFSET(x) offsetof(WebMDashMuxContext, x)
293 static const AVOption options[] = {
294 { "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 },
298 #if CONFIG_WEBM_DASH_MANIFEST_MUXER
299 static const AVClass webm_dash_class = {
300 .class_name = "WebM DASH Manifest muxer",
301 .item_name = av_default_item_name,
303 .version = LIBAVUTIL_VERSION_INT,
306 AVOutputFormat ff_webm_dash_manifest_muxer = {
307 .name = "webm_dash_manifest",
308 .long_name = NULL_IF_CONFIG_SMALL("WebM DASH Manifest"),
309 .mime_type = "application/xml",
311 .priv_data_size = sizeof(WebMDashMuxContext),
312 .write_header = webm_dash_manifest_write_header,
313 .write_packet = webm_dash_manifest_write_packet,
314 .write_trailer = webm_dash_manifest_write_trailer,
315 .priv_class = &webm_dash_class,