hls: Check av_opt_set_dict return value as well
[libav.git] / libavformat / hls.c
1 /*
2 * Apple HTTP Live Streaming demuxer
3 * Copyright (c) 2010 Martin Storsjo
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 /**
23 * @file
24 * Apple HTTP Live Streaming demuxer
25 * http://tools.ietf.org/html/draft-pantos-http-live-streaming
26 */
27
28 #include "libavutil/avstring.h"
29 #include "libavutil/intreadwrite.h"
30 #include "libavutil/mathematics.h"
31 #include "libavutil/opt.h"
32 #include "libavutil/dict.h"
33 #include "libavutil/time.h"
34 #include "avformat.h"
35 #include "internal.h"
36 #include "avio_internal.h"
37 #include "url.h"
38
39 #define INITIAL_BUFFER_SIZE 32768
40
41 /*
42 * An apple http stream consists of a playlist with media segment files,
43 * played sequentially. There may be several playlists with the same
44 * video content, in different bandwidth variants, that are played in
45 * parallel (preferably only one bandwidth variant at a time). In this case,
46 * the user supplied the url to a main playlist that only lists the variant
47 * playlists.
48 *
49 * If the main playlist doesn't point at any variants, we still create
50 * one anonymous toplevel variant for this, to maintain the structure.
51 */
52
53 enum KeyType {
54 KEY_NONE,
55 KEY_AES_128,
56 };
57
58 struct segment {
59 int64_t duration;
60 char url[MAX_URL_SIZE];
61 char key[MAX_URL_SIZE];
62 enum KeyType key_type;
63 uint8_t iv[16];
64 };
65
66 /*
67 * Each variant has its own demuxer. If it currently is active,
68 * it has an open AVIOContext too, and potentially an AVPacket
69 * containing the next packet from this stream.
70 */
71 struct variant {
72 int bandwidth;
73 char url[MAX_URL_SIZE];
74 AVIOContext pb;
75 uint8_t* read_buffer;
76 URLContext *input;
77 AVFormatContext *parent;
78 int index;
79 AVFormatContext *ctx;
80 AVPacket pkt;
81 int stream_offset;
82
83 int finished;
84 int64_t target_duration;
85 int start_seq_no;
86 int n_segments;
87 struct segment **segments;
88 int needed, cur_needed;
89 int cur_seq_no;
90 int64_t last_load_time;
91
92 char key_url[MAX_URL_SIZE];
93 uint8_t key[16];
94 };
95
96 typedef struct HLSContext {
97 int n_variants;
98 struct variant **variants;
99 int cur_seq_no;
100 int end_of_segment;
101 int first_packet;
102 int64_t first_timestamp;
103 int64_t seek_timestamp;
104 int seek_flags;
105 AVIOInterruptCB *interrupt_callback;
106 AVDictionary *avio_opts;
107 } HLSContext;
108
109 static int read_chomp_line(AVIOContext *s, char *buf, int maxlen)
110 {
111 int len = ff_get_line(s, buf, maxlen);
112 while (len > 0 && av_isspace(buf[len - 1]))
113 buf[--len] = '\0';
114 return len;
115 }
116
117 static void free_segment_list(struct variant *var)
118 {
119 int i;
120 for (i = 0; i < var->n_segments; i++)
121 av_free(var->segments[i]);
122 av_freep(&var->segments);
123 var->n_segments = 0;
124 }
125
126 static void free_variant_list(HLSContext *c)
127 {
128 int i;
129 for (i = 0; i < c->n_variants; i++) {
130 struct variant *var = c->variants[i];
131 free_segment_list(var);
132 av_free_packet(&var->pkt);
133 av_free(var->pb.buffer);
134 if (var->input)
135 ffurl_close(var->input);
136 if (var->ctx) {
137 var->ctx->pb = NULL;
138 avformat_close_input(&var->ctx);
139 }
140 av_free(var);
141 }
142 av_freep(&c->variants);
143 c->n_variants = 0;
144 }
145
146 /*
147 * Used to reset a statically allocated AVPacket to a clean slate,
148 * containing no data.
149 */
150 static void reset_packet(AVPacket *pkt)
151 {
152 av_init_packet(pkt);
153 pkt->data = NULL;
154 }
155
156 static struct variant *new_variant(HLSContext *c, int bandwidth,
157 const char *url, const char *base)
158 {
159 struct variant *var = av_mallocz(sizeof(struct variant));
160 if (!var)
161 return NULL;
162 reset_packet(&var->pkt);
163 var->bandwidth = bandwidth;
164 ff_make_absolute_url(var->url, sizeof(var->url), base, url);
165 dynarray_add(&c->variants, &c->n_variants, var);
166 return var;
167 }
168
169 struct variant_info {
170 char bandwidth[20];
171 };
172
173 static void handle_variant_args(struct variant_info *info, const char *key,
174 int key_len, char **dest, int *dest_len)
175 {
176 if (!strncmp(key, "BANDWIDTH=", key_len)) {
177 *dest = info->bandwidth;
178 *dest_len = sizeof(info->bandwidth);
179 }
180 }
181
182 struct key_info {
183 char uri[MAX_URL_SIZE];
184 char method[10];
185 char iv[35];
186 };
187
188 static void handle_key_args(struct key_info *info, const char *key,
189 int key_len, char **dest, int *dest_len)
190 {
191 if (!strncmp(key, "METHOD=", key_len)) {
192 *dest = info->method;
193 *dest_len = sizeof(info->method);
194 } else if (!strncmp(key, "URI=", key_len)) {
195 *dest = info->uri;
196 *dest_len = sizeof(info->uri);
197 } else if (!strncmp(key, "IV=", key_len)) {
198 *dest = info->iv;
199 *dest_len = sizeof(info->iv);
200 }
201 }
202
203 static int open_in(HLSContext *c, AVIOContext **in, const char *url)
204 {
205 AVDictionary *tmp = NULL;
206 int ret;
207
208 av_dict_copy(&tmp, c->avio_opts, 0);
209
210 ret = avio_open2(in, url, AVIO_FLAG_READ, c->interrupt_callback, &tmp);
211
212 av_dict_free(&tmp);
213 return ret;
214 }
215
216 static int url_connect(struct variant *var, AVDictionary *opts)
217 {
218 AVDictionary *tmp = NULL;
219 int ret;
220
221 av_dict_copy(&tmp, opts, 0);
222
223 if ((ret = av_opt_set_dict(var->input, &tmp)) < 0 ||
224 (ret = ffurl_connect(var->input, NULL)) < 0) {
225 ffurl_close(var->input);
226 var->input = NULL;
227 }
228
229 av_dict_free(&tmp);
230 return ret;
231 }
232
233 static int open_url(HLSContext *c, URLContext **uc, const char *url)
234 {
235 AVDictionary *tmp = NULL;
236 int ret;
237
238 av_dict_copy(&tmp, c->avio_opts, 0);
239
240 ret = ffurl_open(uc, url, AVIO_FLAG_READ, c->interrupt_callback, &tmp);
241
242 av_dict_free(&tmp);
243
244 return ret;
245 }
246
247 static int parse_playlist(HLSContext *c, const char *url,
248 struct variant *var, AVIOContext *in)
249 {
250 int ret = 0, is_segment = 0, is_variant = 0, bandwidth = 0;
251 int64_t duration = 0;
252 enum KeyType key_type = KEY_NONE;
253 uint8_t iv[16] = "";
254 int has_iv = 0;
255 char key[MAX_URL_SIZE] = "";
256 char line[1024];
257 const char *ptr;
258 int close_in = 0;
259 uint8_t *new_url = NULL;
260
261 if (!in) {
262 ret = open_in(c, &in, url);
263 if (ret < 0)
264 return ret;
265 close_in = 1;
266 }
267
268 if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0)
269 url = new_url;
270
271 read_chomp_line(in, line, sizeof(line));
272 if (strcmp(line, "#EXTM3U")) {
273 ret = AVERROR_INVALIDDATA;
274 goto fail;
275 }
276
277 if (var) {
278 free_segment_list(var);
279 var->finished = 0;
280 }
281 while (!in->eof_reached) {
282 read_chomp_line(in, line, sizeof(line));
283 if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) {
284 struct variant_info info = {{0}};
285 is_variant = 1;
286 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_variant_args,
287 &info);
288 bandwidth = atoi(info.bandwidth);
289 } else if (av_strstart(line, "#EXT-X-KEY:", &ptr)) {
290 struct key_info info = {{0}};
291 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_key_args,
292 &info);
293 key_type = KEY_NONE;
294 has_iv = 0;
295 if (!strcmp(info.method, "AES-128"))
296 key_type = KEY_AES_128;
297 if (!strncmp(info.iv, "0x", 2) || !strncmp(info.iv, "0X", 2)) {
298 ff_hex_to_data(iv, info.iv + 2);
299 has_iv = 1;
300 }
301 av_strlcpy(key, info.uri, sizeof(key));
302 } else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) {
303 if (!var) {
304 var = new_variant(c, 0, url, NULL);
305 if (!var) {
306 ret = AVERROR(ENOMEM);
307 goto fail;
308 }
309 }
310 var->target_duration = atoi(ptr) * AV_TIME_BASE;
311 } else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
312 if (!var) {
313 var = new_variant(c, 0, url, NULL);
314 if (!var) {
315 ret = AVERROR(ENOMEM);
316 goto fail;
317 }
318 }
319 var->start_seq_no = atoi(ptr);
320 } else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) {
321 if (var)
322 var->finished = 1;
323 } else if (av_strstart(line, "#EXTINF:", &ptr)) {
324 is_segment = 1;
325 duration = atof(ptr) * AV_TIME_BASE;
326 } else if (av_strstart(line, "#", NULL)) {
327 continue;
328 } else if (line[0]) {
329 if (is_variant) {
330 if (!new_variant(c, bandwidth, line, url)) {
331 ret = AVERROR(ENOMEM);
332 goto fail;
333 }
334 is_variant = 0;
335 bandwidth = 0;
336 }
337 if (is_segment) {
338 struct segment *seg;
339 if (!var) {
340 var = new_variant(c, 0, url, NULL);
341 if (!var) {
342 ret = AVERROR(ENOMEM);
343 goto fail;
344 }
345 }
346 seg = av_malloc(sizeof(struct segment));
347 if (!seg) {
348 ret = AVERROR(ENOMEM);
349 goto fail;
350 }
351 seg->duration = duration;
352 seg->key_type = key_type;
353 if (has_iv) {
354 memcpy(seg->iv, iv, sizeof(iv));
355 } else {
356 int seq = var->start_seq_no + var->n_segments;
357 memset(seg->iv, 0, sizeof(seg->iv));
358 AV_WB32(seg->iv + 12, seq);
359 }
360 ff_make_absolute_url(seg->key, sizeof(seg->key), url, key);
361 ff_make_absolute_url(seg->url, sizeof(seg->url), url, line);
362 dynarray_add(&var->segments, &var->n_segments, seg);
363 is_segment = 0;
364 }
365 }
366 }
367 if (var)
368 var->last_load_time = av_gettime_relative();
369
370 fail:
371 av_free(new_url);
372 if (close_in)
373 avio_close(in);
374 return ret;
375 }
376
377 static int open_input(struct variant *var)
378 {
379 struct segment *seg = var->segments[var->cur_seq_no - var->start_seq_no];
380 if (seg->key_type == KEY_NONE) {
381 return open_url(var->parent->priv_data, &var->input, seg->url);
382 } else if (seg->key_type == KEY_AES_128) {
383 HLSContext *c = var->parent->priv_data;
384 char iv[33], key[33], url[MAX_URL_SIZE];
385 int ret;
386 if (strcmp(seg->key, var->key_url)) {
387 URLContext *uc;
388 if (open_url(var->parent->priv_data, &uc, seg->key) == 0) {
389 if (ffurl_read_complete(uc, var->key, sizeof(var->key))
390 != sizeof(var->key)) {
391 av_log(NULL, AV_LOG_ERROR, "Unable to read key file %s\n",
392 seg->key);
393 }
394 ffurl_close(uc);
395 } else {
396 av_log(NULL, AV_LOG_ERROR, "Unable to open key file %s\n",
397 seg->key);
398 }
399 av_strlcpy(var->key_url, seg->key, sizeof(var->key_url));
400 }
401 ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0);
402 ff_data_to_hex(key, var->key, sizeof(var->key), 0);
403 iv[32] = key[32] = '\0';
404 if (strstr(seg->url, "://"))
405 snprintf(url, sizeof(url), "crypto+%s", seg->url);
406 else
407 snprintf(url, sizeof(url), "crypto:%s", seg->url);
408 if ((ret = ffurl_alloc(&var->input, url, AVIO_FLAG_READ,
409 &var->parent->interrupt_callback)) < 0)
410 return ret;
411 av_opt_set(var->input->priv_data, "key", key, 0);
412 av_opt_set(var->input->priv_data, "iv", iv, 0);
413
414 return url_connect(var, c->avio_opts);
415 }
416 return AVERROR(ENOSYS);
417 }
418
419 static int read_data(void *opaque, uint8_t *buf, int buf_size)
420 {
421 struct variant *v = opaque;
422 HLSContext *c = v->parent->priv_data;
423 int ret, i;
424
425 restart:
426 if (!v->input) {
427 /* If this is a live stream and the reload interval has elapsed since
428 * the last playlist reload, reload the variant playlists now. */
429 int64_t reload_interval = v->n_segments > 0 ?
430 v->segments[v->n_segments - 1]->duration :
431 v->target_duration;
432
433 reload:
434 if (!v->finished &&
435 av_gettime_relative() - v->last_load_time >= reload_interval) {
436 if ((ret = parse_playlist(c, v->url, v, NULL)) < 0)
437 return ret;
438 /* If we need to reload the playlist again below (if
439 * there's still no more segments), switch to a reload
440 * interval of half the target duration. */
441 reload_interval = v->target_duration / 2;
442 }
443 if (v->cur_seq_no < v->start_seq_no) {
444 av_log(NULL, AV_LOG_WARNING,
445 "skipping %d segments ahead, expired from playlists\n",
446 v->start_seq_no - v->cur_seq_no);
447 v->cur_seq_no = v->start_seq_no;
448 }
449 if (v->cur_seq_no >= v->start_seq_no + v->n_segments) {
450 if (v->finished)
451 return AVERROR_EOF;
452 while (av_gettime_relative() - v->last_load_time < reload_interval) {
453 if (ff_check_interrupt(c->interrupt_callback))
454 return AVERROR_EXIT;
455 av_usleep(100*1000);
456 }
457 /* Enough time has elapsed since the last reload */
458 goto reload;
459 }
460
461 ret = open_input(v);
462 if (ret < 0)
463 return ret;
464 }
465 ret = ffurl_read(v->input, buf, buf_size);
466 if (ret > 0)
467 return ret;
468 ffurl_close(v->input);
469 v->input = NULL;
470 v->cur_seq_no++;
471
472 c->end_of_segment = 1;
473 c->cur_seq_no = v->cur_seq_no;
474
475 if (v->ctx && v->ctx->nb_streams &&
476 v->parent->nb_streams >= v->stream_offset + v->ctx->nb_streams) {
477 v->needed = 0;
478 for (i = v->stream_offset; i < v->stream_offset + v->ctx->nb_streams;
479 i++) {
480 if (v->parent->streams[i]->discard < AVDISCARD_ALL)
481 v->needed = 1;
482 }
483 }
484 if (!v->needed) {
485 av_log(v->parent, AV_LOG_INFO, "No longer receiving variant %d\n",
486 v->index);
487 return AVERROR_EOF;
488 }
489 goto restart;
490 }
491
492 static int save_avio_options(AVFormatContext *s)
493 {
494 HLSContext *c = s->priv_data;
495 const char *opts[] = { "headers", "user_agent", NULL }, **opt = opts;
496 uint8_t *buf;
497 int ret = 0;
498
499 while (*opt) {
500 if (av_opt_get(s->pb, *opt, AV_OPT_SEARCH_CHILDREN, &buf) >= 0) {
501 ret = av_dict_set(&c->avio_opts, *opt, buf,
502 AV_DICT_DONT_STRDUP_VAL);
503 if (ret < 0)
504 return ret;
505 }
506 opt++;
507 }
508
509 return ret;
510 }
511
512 static int hls_read_header(AVFormatContext *s)
513 {
514 HLSContext *c = s->priv_data;
515 int ret = 0, i, j, stream_offset = 0;
516
517 c->interrupt_callback = &s->interrupt_callback;
518
519 if ((ret = parse_playlist(c, s->filename, NULL, s->pb)) < 0)
520 goto fail;
521
522 if ((ret = save_avio_options(s)) < 0)
523 goto fail;
524
525 if (c->n_variants == 0) {
526 av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
527 ret = AVERROR_EOF;
528 goto fail;
529 }
530 /* If the playlist only contained variants, parse each individual
531 * variant playlist. */
532 if (c->n_variants > 1 || c->variants[0]->n_segments == 0) {
533 for (i = 0; i < c->n_variants; i++) {
534 struct variant *v = c->variants[i];
535 if ((ret = parse_playlist(c, v->url, v, NULL)) < 0)
536 goto fail;
537 }
538 }
539
540 if (c->variants[0]->n_segments == 0) {
541 av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
542 ret = AVERROR_EOF;
543 goto fail;
544 }
545
546 /* If this isn't a live stream, calculate the total duration of the
547 * stream. */
548 if (c->variants[0]->finished) {
549 int64_t duration = 0;
550 for (i = 0; i < c->variants[0]->n_segments; i++)
551 duration += c->variants[0]->segments[i]->duration;
552 s->duration = duration;
553 }
554
555 /* Open the demuxer for each variant */
556 for (i = 0; i < c->n_variants; i++) {
557 struct variant *v = c->variants[i];
558 AVInputFormat *in_fmt = NULL;
559 char bitrate_str[20];
560 AVProgram *program;
561
562 if (v->n_segments == 0)
563 continue;
564
565 if (!(v->ctx = avformat_alloc_context())) {
566 ret = AVERROR(ENOMEM);
567 goto fail;
568 }
569
570 v->index = i;
571 v->needed = 1;
572 v->parent = s;
573
574 /* If this is a live stream with more than 3 segments, start at the
575 * third last segment. */
576 v->cur_seq_no = v->start_seq_no;
577 if (!v->finished && v->n_segments > 3)
578 v->cur_seq_no = v->start_seq_no + v->n_segments - 3;
579
580 v->read_buffer = av_malloc(INITIAL_BUFFER_SIZE);
581 ffio_init_context(&v->pb, v->read_buffer, INITIAL_BUFFER_SIZE, 0, v,
582 read_data, NULL, NULL);
583 v->pb.seekable = 0;
584 ret = av_probe_input_buffer(&v->pb, &in_fmt, v->segments[0]->url,
585 NULL, 0, 0);
586 if (ret < 0) {
587 /* Free the ctx - it isn't initialized properly at this point,
588 * so avformat_close_input shouldn't be called. If
589 * avformat_open_input fails below, it frees and zeros the
590 * context, so it doesn't need any special treatment like this. */
591 avformat_free_context(v->ctx);
592 v->ctx = NULL;
593 goto fail;
594 }
595 v->ctx->pb = &v->pb;
596 v->stream_offset = stream_offset;
597 ret = avformat_open_input(&v->ctx, v->segments[0]->url, in_fmt, NULL);
598 if (ret < 0)
599 goto fail;
600
601 v->ctx->ctx_flags &= ~AVFMTCTX_NOHEADER;
602 ret = avformat_find_stream_info(v->ctx, NULL);
603 if (ret < 0)
604 goto fail;
605 snprintf(bitrate_str, sizeof(bitrate_str), "%d", v->bandwidth);
606
607 program = av_new_program(s, i);
608 if (!program)
609 goto fail;
610 av_dict_set(&program->metadata, "variant_bitrate", bitrate_str, 0);
611
612 /* Create new AVStreams for each stream in this variant */
613 for (j = 0; j < v->ctx->nb_streams; j++) {
614 AVStream *st = avformat_new_stream(s, NULL);
615 AVStream *ist = v->ctx->streams[j];
616 if (!st) {
617 ret = AVERROR(ENOMEM);
618 goto fail;
619 }
620 ff_program_add_stream_index(s, i, stream_offset + j);
621 st->id = i;
622 avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den);
623 avcodec_copy_context(st->codec, v->ctx->streams[j]->codec);
624 if (v->bandwidth)
625 av_dict_set(&st->metadata, "variant_bitrate", bitrate_str,
626 0);
627 }
628 stream_offset += v->ctx->nb_streams;
629 }
630
631 c->first_packet = 1;
632 c->first_timestamp = AV_NOPTS_VALUE;
633 c->seek_timestamp = AV_NOPTS_VALUE;
634
635 return 0;
636 fail:
637 free_variant_list(c);
638 return ret;
639 }
640
641 static int recheck_discard_flags(AVFormatContext *s, int first)
642 {
643 HLSContext *c = s->priv_data;
644 int i, changed = 0;
645
646 /* Check if any new streams are needed */
647 for (i = 0; i < c->n_variants; i++)
648 c->variants[i]->cur_needed = 0;;
649
650 for (i = 0; i < s->nb_streams; i++) {
651 AVStream *st = s->streams[i];
652 struct variant *var = c->variants[s->streams[i]->id];
653 if (st->discard < AVDISCARD_ALL)
654 var->cur_needed = 1;
655 }
656 for (i = 0; i < c->n_variants; i++) {
657 struct variant *v = c->variants[i];
658 if (v->cur_needed && !v->needed) {
659 v->needed = 1;
660 changed = 1;
661 v->cur_seq_no = c->cur_seq_no;
662 v->pb.eof_reached = 0;
663 av_log(s, AV_LOG_INFO, "Now receiving variant %d\n", i);
664 } else if (first && !v->cur_needed && v->needed) {
665 if (v->input)
666 ffurl_close(v->input);
667 v->input = NULL;
668 v->needed = 0;
669 changed = 1;
670 av_log(s, AV_LOG_INFO, "No longer receiving variant %d\n", i);
671 }
672 }
673 return changed;
674 }
675
676 static int hls_read_packet(AVFormatContext *s, AVPacket *pkt)
677 {
678 HLSContext *c = s->priv_data;
679 int ret, i, minvariant = -1;
680
681 if (c->first_packet) {
682 recheck_discard_flags(s, 1);
683 c->first_packet = 0;
684 }
685
686 start:
687 c->end_of_segment = 0;
688 for (i = 0; i < c->n_variants; i++) {
689 struct variant *var = c->variants[i];
690 /* Make sure we've got one buffered packet from each open variant
691 * stream */
692 if (var->needed && !var->pkt.data) {
693 while (1) {
694 int64_t ts_diff;
695 AVStream *st;
696 ret = av_read_frame(var->ctx, &var->pkt);
697 if (ret < 0) {
698 if (!var->pb.eof_reached)
699 return ret;
700 reset_packet(&var->pkt);
701 break;
702 } else {
703 if (c->first_timestamp == AV_NOPTS_VALUE &&
704 var->pkt.dts != AV_NOPTS_VALUE)
705 c->first_timestamp = av_rescale_q(var->pkt.dts,
706 var->ctx->streams[var->pkt.stream_index]->time_base,
707 AV_TIME_BASE_Q);
708 }
709
710 if (c->seek_timestamp == AV_NOPTS_VALUE)
711 break;
712
713 if (var->pkt.dts == AV_NOPTS_VALUE) {
714 c->seek_timestamp = AV_NOPTS_VALUE;
715 break;
716 }
717
718 st = var->ctx->streams[var->pkt.stream_index];
719 ts_diff = av_rescale_rnd(var->pkt.dts, AV_TIME_BASE,
720 st->time_base.den, AV_ROUND_DOWN) -
721 c->seek_timestamp;
722 if (ts_diff >= 0 && (c->seek_flags & AVSEEK_FLAG_ANY ||
723 var->pkt.flags & AV_PKT_FLAG_KEY)) {
724 c->seek_timestamp = AV_NOPTS_VALUE;
725 break;
726 }
727 av_free_packet(&var->pkt);
728 reset_packet(&var->pkt);
729 }
730 }
731 /* Check if this stream still is on an earlier segment number, or
732 * has the packet with the lowest dts */
733 if (var->pkt.data) {
734 struct variant *minvar = minvariant < 0 ?
735 NULL : c->variants[minvariant];
736 if (minvariant < 0 || var->cur_seq_no < minvar->cur_seq_no) {
737 minvariant = i;
738 } else if (var->cur_seq_no == minvar->cur_seq_no) {
739 int64_t dts = var->pkt.dts;
740 int64_t mindts = minvar->pkt.dts;
741 AVStream *st = var->ctx->streams[var->pkt.stream_index];
742 AVStream *minst = minvar->ctx->streams[minvar->pkt.stream_index];
743
744 if (dts == AV_NOPTS_VALUE) {
745 minvariant = i;
746 } else if (mindts != AV_NOPTS_VALUE) {
747 if (st->start_time != AV_NOPTS_VALUE)
748 dts -= st->start_time;
749 if (minst->start_time != AV_NOPTS_VALUE)
750 mindts -= minst->start_time;
751
752 if (av_compare_ts(dts, st->time_base,
753 mindts, minst->time_base) < 0)
754 minvariant = i;
755 }
756 }
757 }
758 }
759 if (c->end_of_segment) {
760 if (recheck_discard_flags(s, 0))
761 goto start;
762 }
763 /* If we got a packet, return it */
764 if (minvariant >= 0) {
765 *pkt = c->variants[minvariant]->pkt;
766 pkt->stream_index += c->variants[minvariant]->stream_offset;
767 reset_packet(&c->variants[minvariant]->pkt);
768 return 0;
769 }
770 return AVERROR_EOF;
771 }
772
773 static int hls_close(AVFormatContext *s)
774 {
775 HLSContext *c = s->priv_data;
776
777 free_variant_list(c);
778
779 av_dict_free(&c->avio_opts);
780
781 return 0;
782 }
783
784 static int hls_read_seek(AVFormatContext *s, int stream_index,
785 int64_t timestamp, int flags)
786 {
787 HLSContext *c = s->priv_data;
788 int i, j, ret;
789
790 if ((flags & AVSEEK_FLAG_BYTE) || !c->variants[0]->finished)
791 return AVERROR(ENOSYS);
792
793 c->seek_flags = flags;
794 c->seek_timestamp = stream_index < 0 ? timestamp :
795 av_rescale_rnd(timestamp, AV_TIME_BASE,
796 s->streams[stream_index]->time_base.den,
797 flags & AVSEEK_FLAG_BACKWARD ?
798 AV_ROUND_DOWN : AV_ROUND_UP);
799 timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE, stream_index >= 0 ?
800 s->streams[stream_index]->time_base.den :
801 AV_TIME_BASE, flags & AVSEEK_FLAG_BACKWARD ?
802 AV_ROUND_DOWN : AV_ROUND_UP);
803 if (s->duration < c->seek_timestamp) {
804 c->seek_timestamp = AV_NOPTS_VALUE;
805 return AVERROR(EIO);
806 }
807
808 ret = AVERROR(EIO);
809 for (i = 0; i < c->n_variants; i++) {
810 /* Reset reading */
811 struct variant *var = c->variants[i];
812 int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ?
813 0 : c->first_timestamp;
814 if (var->input) {
815 ffurl_close(var->input);
816 var->input = NULL;
817 }
818 av_free_packet(&var->pkt);
819 reset_packet(&var->pkt);
820 var->pb.eof_reached = 0;
821 /* Clear any buffered data */
822 var->pb.buf_end = var->pb.buf_ptr = var->pb.buffer;
823 /* Reset the pos, to let the mpegts demuxer know we've seeked. */
824 var->pb.pos = 0;
825
826 /* Locate the segment that contains the target timestamp */
827 for (j = 0; j < var->n_segments; j++) {
828 if (timestamp >= pos &&
829 timestamp < pos + var->segments[j]->duration) {
830 var->cur_seq_no = var->start_seq_no + j;
831 ret = 0;
832 break;
833 }
834 pos += var->segments[j]->duration;
835 }
836 if (ret)
837 c->seek_timestamp = AV_NOPTS_VALUE;
838 }
839 return ret;
840 }
841
842 static int hls_probe(AVProbeData *p)
843 {
844 /* Require #EXTM3U at the start, and either one of the ones below
845 * somewhere for a proper match. */
846 if (strncmp(p->buf, "#EXTM3U", 7))
847 return 0;
848 if (strstr(p->buf, "#EXT-X-STREAM-INF:") ||
849 strstr(p->buf, "#EXT-X-TARGETDURATION:") ||
850 strstr(p->buf, "#EXT-X-MEDIA-SEQUENCE:"))
851 return AVPROBE_SCORE_MAX;
852 return 0;
853 }
854
855 AVInputFormat ff_hls_demuxer = {
856 .name = "hls,applehttp",
857 .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
858 .priv_data_size = sizeof(HLSContext),
859 .read_probe = hls_probe,
860 .read_header = hls_read_header,
861 .read_packet = hls_read_packet,
862 .read_close = hls_close,
863 .read_seek = hls_read_seek,
864 };