crypto: Add encryption support
[libav.git] / libavformat / hlsenc.c
CommitLineData
22a0827d
LB
1/*
2 * Apple HTTP Live Streaming segmenter
3 * Copyright (c) 2012, Luca Barbato
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include <float.h>
8f8bc923 23#include <stdint.h>
22a0827d
LB
24
25#include "libavutil/mathematics.h"
26#include "libavutil/parseutils.h"
27#include "libavutil/avstring.h"
28#include "libavutil/opt.h"
29#include "libavutil/log.h"
30
31#include "avformat.h"
32#include "internal.h"
33
34typedef struct ListEntry {
35 char name[1024];
72839fce 36 int64_t duration; // segment duration in AV_TIME_BASE units
22a0827d
LB
37 struct ListEntry *next;
38} ListEntry;
39
40typedef struct HLSContext {
41 const AVClass *class; // Class for private options.
30a76487 42 unsigned number;
27a15e0a 43 int64_t sequence;
c7603b3c 44 int64_t start_sequence;
22a0827d
LB
45 AVOutputFormat *oformat;
46 AVFormatContext *avf;
47 float time; // Set by a private option.
48 int size; // Set by a private option.
49 int wrap; // Set by a private option.
2157df42 50 int version; // Set by a private option.
55f03d87 51 int allowcache;
22a0827d
LB
52 int64_t recording_time;
53 int has_video;
72839fce 54 // The following timestamps are in AV_TIME_BASE units.
22a0827d
LB
55 int64_t start_pts;
56 int64_t end_pts;
72839fce 57 int64_t duration; // last segment duration computed so far.
0448f26c 58 int nb_entries;
22a0827d
LB
59 ListEntry *list;
60 ListEntry *end_list;
61 char *basename;
5a70a783 62 char *baseurl;
22a0827d
LB
63} HLSContext;
64
65static int hls_mux_init(AVFormatContext *s)
66{
67 HLSContext *hls = s->priv_data;
68 AVFormatContext *oc;
69 int i;
70
71 hls->avf = oc = avformat_alloc_context();
72 if (!oc)
73 return AVERROR(ENOMEM);
74
75 oc->oformat = hls->oformat;
76 oc->interrupt_callback = s->interrupt_callback;
9f61abc8
AK
77 oc->opaque = s->opaque;
78 oc->io_open = s->io_open;
79 oc->io_close = s->io_close;
22a0827d
LB
80
81 for (i = 0; i < s->nb_streams; i++) {
82 AVStream *st;
83 if (!(st = avformat_new_stream(oc, NULL)))
84 return AVERROR(ENOMEM);
9200514a 85 avcodec_parameters_copy(st->codecpar, s->streams[i]->codecpar);
22a0827d 86 st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
28816050 87 st->time_base = s->streams[i]->time_base;
22a0827d
LB
88 }
89
90 return 0;
91}
92
72839fce 93static int append_entry(HLSContext *hls, int64_t duration)
22a0827d
LB
94{
95 ListEntry *en = av_malloc(sizeof(*en));
96
97 if (!en)
98 return AVERROR(ENOMEM);
99
ae85d6c9 100 av_strlcpy(en->name, av_basename(hls->avf->filename), sizeof(en->name));
22a0827d
LB
101
102 en->duration = duration;
103 en->next = NULL;
104
105 if (!hls->list)
106 hls->list = en;
107 else
108 hls->end_list->next = en;
109
110 hls->end_list = en;
111
0448f26c 112 if (hls->nb_entries >= hls->size) {
22a0827d
LB
113 en = hls->list;
114 hls->list = en->next;
115 av_free(en);
0448f26c
LB
116 } else
117 hls->nb_entries++;
22a0827d 118
27a15e0a
K
119 hls->sequence++;
120
22a0827d
LB
121 return 0;
122}
123
124static void free_entries(HLSContext *hls)
125{
126 ListEntry *p = hls->list, *en;
127
128 while(p) {
129 en = p;
130 p = p->next;
131 av_free(en);
132 }
133}
134
135static int hls_window(AVFormatContext *s, int last)
136{
137 HLSContext *hls = s->priv_data;
138 ListEntry *en;
72839fce 139 int64_t target_duration = 0;
22a0827d 140 int ret = 0;
ff48ae94 141 AVIOContext *out = NULL;
3fe26bb6 142 char temp_filename[1024];
a1643103 143 int64_t sequence = FFMAX(hls->start_sequence, hls->sequence - hls->size);
22a0827d 144
3fe26bb6 145 snprintf(temp_filename, sizeof(temp_filename), "%s.tmp", s->filename);
9f61abc8 146 if ((ret = s->io_open(s, &out, temp_filename, AVIO_FLAG_WRITE, NULL)) < 0)
22a0827d
LB
147 goto fail;
148
7e98956e
LB
149 for (en = hls->list; en; en = en->next) {
150 if (target_duration < en->duration)
151 target_duration = en->duration;
152 }
153
ff48ae94 154 avio_printf(out, "#EXTM3U\n");
2157df42 155 avio_printf(out, "#EXT-X-VERSION:%d\n", hls->version);
55f03d87 156 if (hls->allowcache == 0 || hls->allowcache == 1) {
ff48ae94 157 avio_printf(out, "#EXT-X-ALLOW-CACHE:%s\n", hls->allowcache == 0 ? "NO" : "YES");
55f03d87 158 }
72839fce 159 avio_printf(out, "#EXT-X-TARGETDURATION:%"PRId64"\n",
2157df42
LB
160 av_rescale_rnd(target_duration, 1, AV_TIME_BASE,
161 AV_ROUND_UP));
ff48ae94 162 avio_printf(out, "#EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence);
22a0827d 163
344f7b5a 164 av_log(s, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%"PRId64"\n",
a1643103 165 sequence);
344f7b5a 166
22a0827d 167 for (en = hls->list; en; en = en->next) {
2157df42
LB
168 if (hls->version > 2)
169 avio_printf(out, "#EXTINF:%f\n",
170 (double)en->duration / AV_TIME_BASE);
171 else
172 avio_printf(out, "#EXTINF:%"PRId64",\n",
173 av_rescale(en->duration, 1, AV_TIME_BASE));
5a70a783 174 if (hls->baseurl)
ff48ae94
HL
175 avio_printf(out, "%s", hls->baseurl);
176 avio_printf(out, "%s\n", en->name);
22a0827d
LB
177 }
178
179 if (last)
ff48ae94 180 avio_printf(out, "#EXT-X-ENDLIST\n");
22a0827d
LB
181
182fail:
9f61abc8 183 ff_format_io_close(s, &out);
3fe26bb6
HL
184 if (ret >= 0)
185 ff_rename(temp_filename, s->filename);
22a0827d
LB
186 return ret;
187}
188
189static int hls_start(AVFormatContext *s)
190{
191 HLSContext *c = s->priv_data;
192 AVFormatContext *oc = c->avf;
193 int err = 0;
194
22a0827d 195 if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
7266e24f 196 c->basename, c->wrap ? c->sequence % c->wrap : c->sequence) < 0)
22a0827d 197 return AVERROR(EINVAL);
9d86bfc2 198 c->number++;
22a0827d 199
9f61abc8 200 if ((err = s->io_open(s, &oc->pb, oc->filename, AVIO_FLAG_WRITE, NULL)) < 0)
22a0827d
LB
201 return err;
202
203 if (oc->oformat->priv_class && oc->priv_data)
204 av_opt_set(oc->priv_data, "mpegts_flags", "resend_headers", 0);
205
206 return 0;
207}
208
209static int hls_write_header(AVFormatContext *s)
210{
211 HLSContext *hls = s->priv_data;
212 int ret, i;
213 char *p;
214 const char *pattern = "%d.ts";
3193b13a 215 int basename_size = strlen(s->filename) + strlen(pattern) + 1;
22a0827d 216
c7603b3c 217 hls->sequence = hls->start_sequence;
0d8cc7a3 218 hls->recording_time = hls->time * AV_TIME_BASE;
22a0827d
LB
219 hls->start_pts = AV_NOPTS_VALUE;
220
221 for (i = 0; i < s->nb_streams; i++)
222 hls->has_video +=
9200514a 223 s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO;
22a0827d
LB
224
225 if (hls->has_video > 1)
226 av_log(s, AV_LOG_WARNING,
227 "More than a single video stream present, "
228 "expect issues decoding it.\n");
229
230 hls->oformat = av_guess_format("mpegts", NULL, NULL);
231
232 if (!hls->oformat) {
233 ret = AVERROR_MUXER_NOT_FOUND;
234 goto fail;
235 }
236
237 hls->basename = av_malloc(basename_size);
238
239 if (!hls->basename) {
240 ret = AVERROR(ENOMEM);
241 goto fail;
242 }
243
244 strcpy(hls->basename, s->filename);
245
246 p = strrchr(hls->basename, '.');
247
248 if (p)
249 *p = '\0';
250
4a9f7d2b 251 av_strlcat(hls->basename, pattern, basename_size);
22a0827d
LB
252
253 if ((ret = hls_mux_init(s)) < 0)
254 goto fail;
255
256 if ((ret = hls_start(s)) < 0)
257 goto fail;
258
259 if ((ret = avformat_write_header(hls->avf, NULL)) < 0)
260 return ret;
261
262
263fail:
264 if (ret) {
265 av_free(hls->basename);
266 if (hls->avf)
267 avformat_free_context(hls->avf);
268 }
269 return ret;
270}
271
272static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
273{
274 HLSContext *hls = s->priv_data;
275 AVFormatContext *oc = hls->avf;
276 AVStream *st = s->streams[pkt->stream_index];
277 int64_t end_pts = hls->recording_time * hls->number;
72839fce 278 int64_t pts = av_rescale_q(pkt->pts, st->time_base, AV_TIME_BASE_Q);
cf679b94 279 int ret, can_split = 1;
22a0827d
LB
280
281 if (hls->start_pts == AV_NOPTS_VALUE) {
72839fce
LB
282 hls->start_pts = pts;
283 hls->end_pts = pts;
22a0827d 284 }
22a0827d 285
cf679b94 286 if (hls->has_video) {
9200514a 287 can_split = st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
cf679b94
AK
288 pkt->flags & AV_PKT_FLAG_KEY;
289 }
09c93b1b
SS
290 if (pkt->pts == AV_NOPTS_VALUE)
291 can_split = 0;
292 else
72839fce 293 hls->duration = pts - hls->end_pts;
22a0827d 294
72839fce 295 if (can_split && pts - hls->start_pts >= end_pts) {
09c93b1b 296 ret = append_entry(hls, hls->duration);
6dd93ee6
LB
297 if (ret)
298 return ret;
299
72839fce 300 hls->end_pts = pts;
09c93b1b 301 hls->duration = 0;
22a0827d
LB
302
303 av_write_frame(oc, NULL); /* Flush any buffered data */
9f61abc8 304 ff_format_io_close(s, &oc->pb);
22a0827d
LB
305
306 ret = hls_start(s);
307
308 if (ret)
309 return ret;
310
311 oc = hls->avf;
312
313 if ((ret = hls_window(s, 0)) < 0)
314 return ret;
315 }
316
317 ret = ff_write_chained(oc, pkt->stream_index, pkt, s);
318
319 return ret;
320}
321
322static int hls_write_trailer(struct AVFormatContext *s)
323{
324 HLSContext *hls = s->priv_data;
325 AVFormatContext *oc = hls->avf;
326
327 av_write_trailer(oc);
9f61abc8 328 ff_format_io_close(s, &oc->pb);
22a0827d
LB
329 avformat_free_context(oc);
330 av_free(hls->basename);
09c93b1b 331 append_entry(hls, hls->duration);
22a0827d
LB
332 hls_window(s, 1);
333
334 free_entries(hls);
22a0827d
LB
335 return 0;
336}
337
338#define OFFSET(x) offsetof(HLSContext, x)
339#define E AV_OPT_FLAG_ENCODING_PARAM
340static const AVOption options[] = {
c7603b3c 341 {"start_number", "first number in the sequence", OFFSET(start_sequence),AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, E},
22a0827d
LB
342 {"hls_time", "segment length in seconds", OFFSET(time), AV_OPT_TYPE_FLOAT, {.dbl = 2}, 0, FLT_MAX, E},
343 {"hls_list_size", "maximum number of playlist entries", OFFSET(size), AV_OPT_TYPE_INT, {.i64 = 5}, 0, INT_MAX, E},
344 {"hls_wrap", "number after which the index wraps", OFFSET(wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E},
55f03d87 345 {"hls_allow_cache", "explicitly set whether the client MAY (1) or MUST NOT (0) cache media segments", OFFSET(allowcache), AV_OPT_TYPE_INT, {.i64 = -1}, INT_MIN, INT_MAX, E},
5a70a783 346 {"hls_base_url", "url to prepend to each playlist entry", OFFSET(baseurl), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E},
2157df42 347 {"hls_version", "protocol version", OFFSET(version), AV_OPT_TYPE_INT, {.i64 = 3}, 2, 3, E},
22a0827d
LB
348 { NULL },
349};
350
351static const AVClass hls_class = {
352 .class_name = "hls muxer",
353 .item_name = av_default_item_name,
354 .option = options,
355 .version = LIBAVUTIL_VERSION_INT,
356};
357
358
359AVOutputFormat ff_hls_muxer = {
360 .name = "hls",
adbe0307 361 .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
22a0827d
LB
362 .extensions = "m3u8",
363 .priv_data_size = sizeof(HLSContext),
34e2ce5d
MS
364 .audio_codec = AV_CODEC_ID_AAC,
365 .video_codec = AV_CODEC_ID_H264,
22a0827d
LB
366 .flags = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH,
367 .write_header = hls_write_header,
368 .write_packet = hls_write_packet,
369 .write_trailer = hls_write_trailer,
370 .priv_class = &hls_class,
371};