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async.c
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1 /*
2  * Input async protocol.
3  * Copyright (c) 2015 Zhang Rui <bbcallen@gmail.com>
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  * Based on libavformat/cache.c by Michael Niedermayer
22  */
23 
24  /**
25  * @TODO
26  * support timeout
27  * support work with concatdec, hls
28  */
29 
30 #include "libavutil/avassert.h"
31 #include "libavutil/avstring.h"
32 #include "libavutil/error.h"
33 #include "libavutil/fifo.h"
34 #include "libavutil/log.h"
35 #include "libavutil/opt.h"
36 #include "libavutil/thread.h"
37 #include "url.h"
38 #include <stdint.h>
39 
40 #if HAVE_UNISTD_H
41 #include <unistd.h>
42 #endif
43 
44 #define BUFFER_CAPACITY (4 * 1024 * 1024)
45 #define READ_BACK_CAPACITY (4 * 1024 * 1024)
46 #define SHORT_SEEK_THRESHOLD (256 * 1024)
47 
48 typedef struct RingBuffer
49 {
52 
53  int read_pos;
54 } RingBuffer;
55 
56 typedef struct Context {
57  AVClass *class;
59 
61  int64_t seek_pos;
64  int64_t seek_ret;
65 
67  int io_error;
69 
70  int64_t logical_pos;
71  int64_t logical_size;
73 
78 
81 } Context;
82 
83 static int ring_init(RingBuffer *ring, unsigned int capacity, int read_back_capacity)
84 {
85  memset(ring, 0, sizeof(RingBuffer));
86  ring->fifo = av_fifo_alloc(capacity + read_back_capacity);
87  if (!ring->fifo)
88  return AVERROR(ENOMEM);
89 
90  ring->read_back_capacity = read_back_capacity;
91  return 0;
92 }
93 
94 static void ring_destroy(RingBuffer *ring)
95 {
96  av_fifo_freep(&ring->fifo);
97 }
98 
99 static void ring_reset(RingBuffer *ring)
100 {
101  av_fifo_reset(ring->fifo);
102  ring->read_pos = 0;
103 }
104 
105 static int ring_size(RingBuffer *ring)
106 {
107  return av_fifo_size(ring->fifo) - ring->read_pos;
108 }
109 
110 static int ring_space(RingBuffer *ring)
111 {
112  return av_fifo_space(ring->fifo);
113 }
114 
115 static int ring_generic_read(RingBuffer *ring, void *dest, int buf_size, void (*func)(void*, void*, int))
116 {
117  int ret;
118 
119  av_assert2(buf_size <= ring_size(ring));
120  ret = av_fifo_generic_peek_at(ring->fifo, dest, ring->read_pos, buf_size, func);
121  ring->read_pos += buf_size;
122 
123  if (ring->read_pos > ring->read_back_capacity) {
124  av_fifo_drain(ring->fifo, ring->read_pos - ring->read_back_capacity);
125  ring->read_pos = ring->read_back_capacity;
126  }
127 
128  return ret;
129 }
130 
131 static int ring_generic_write(RingBuffer *ring, void *src, int size, int (*func)(void*, void*, int))
132 {
133  av_assert2(size <= ring_space(ring));
134  return av_fifo_generic_write(ring->fifo, src, size, func);
135 }
136 
138 {
139  return ring->read_pos;
140 }
141 
142 static int ring_drain(RingBuffer *ring, int offset)
143 {
144  av_assert2(offset >= -ring_size_of_read_back(ring));
145  av_assert2(offset <= -ring_size(ring));
146  ring->read_pos += offset;
147  return 0;
148 }
149 
150 static int async_check_interrupt(void *arg)
151 {
152  URLContext *h = arg;
153  Context *c = h->priv_data;
154 
155  if (c->abort_request)
156  return 1;
157 
159  c->abort_request = 1;
160 
161  return c->abort_request;
162 }
163 
164 static int wrapped_url_read(void *src, void *dst, int size)
165 {
166  URLContext *h = src;
167  Context *c = h->priv_data;
168  int ret;
169 
170  ret = ffurl_read(c->inner, dst, size);
171  c->inner_io_error = ret < 0 ? ret : 0;
172 
173  return ret;
174 }
175 
176 static void *async_buffer_task(void *arg)
177 {
178  URLContext *h = arg;
179  Context *c = h->priv_data;
180  RingBuffer *ring = &c->ring;
181  int ret = 0;
182  int64_t seek_ret;
183 
184  while (1) {
185  int fifo_space, to_copy;
186 
188  if (async_check_interrupt(h)) {
189  c->io_eof_reached = 1;
190  c->io_error = AVERROR_EXIT;
193  break;
194  }
195 
196  if (c->seek_request) {
197  seek_ret = ffurl_seek(c->inner, c->seek_pos, c->seek_whence);
198  if (seek_ret >= 0) {
199  c->io_eof_reached = 0;
200  c->io_error = 0;
201  ring_reset(ring);
202  }
203 
204  c->seek_completed = 1;
205  c->seek_ret = seek_ret;
206  c->seek_request = 0;
207 
208 
211  continue;
212  }
213 
214  fifo_space = ring_space(ring);
215  if (c->io_eof_reached || fifo_space <= 0) {
219  continue;
220  }
222 
223  to_copy = FFMIN(4096, fifo_space);
224  ret = ring_generic_write(ring, (void *)h, to_copy, wrapped_url_read);
225 
227  if (ret <= 0) {
228  c->io_eof_reached = 1;
229  if (c->inner_io_error < 0)
230  c->io_error = c->inner_io_error;
231  }
232 
235  }
236 
237  return NULL;
238 }
239 
240 static int async_open(URLContext *h, const char *arg, int flags, AVDictionary **options)
241 {
242  Context *c = h->priv_data;
243  int ret;
244  AVIOInterruptCB interrupt_callback = {.callback = async_check_interrupt, .opaque = h};
245 
246  av_strstart(arg, "async:", &arg);
247 
249  if (ret < 0)
250  goto fifo_fail;
251 
252  /* wrap interrupt callback */
254  ret = ffurl_open_whitelist(&c->inner, arg, flags, &interrupt_callback, options, h->protocol_whitelist, h->protocol_blacklist, h);
255  if (ret != 0) {
256  av_log(h, AV_LOG_ERROR, "ffurl_open failed : %s, %s\n", av_err2str(ret), arg);
257  goto url_fail;
258  }
259 
260  c->logical_size = ffurl_size(c->inner);
261  h->is_streamed = c->inner->is_streamed;
262 
263  ret = pthread_mutex_init(&c->mutex, NULL);
264  if (ret != 0) {
265  av_log(h, AV_LOG_ERROR, "pthread_mutex_init failed : %s\n", av_err2str(ret));
266  goto mutex_fail;
267  }
268 
270  if (ret != 0) {
271  av_log(h, AV_LOG_ERROR, "pthread_cond_init failed : %s\n", av_err2str(ret));
272  goto cond_wakeup_main_fail;
273  }
274 
276  if (ret != 0) {
277  av_log(h, AV_LOG_ERROR, "pthread_cond_init failed : %s\n", av_err2str(ret));
278  goto cond_wakeup_background_fail;
279  }
280 
282  if (ret) {
283  av_log(h, AV_LOG_ERROR, "pthread_create failed : %s\n", av_err2str(ret));
284  goto thread_fail;
285  }
286 
287  return 0;
288 
289 thread_fail:
291 cond_wakeup_background_fail:
293 cond_wakeup_main_fail:
295 mutex_fail:
296  ffurl_close(c->inner);
297 url_fail:
298  ring_destroy(&c->ring);
299 fifo_fail:
300  return ret;
301 }
302 
304 {
305  Context *c = h->priv_data;
306  int ret;
307 
309  c->abort_request = 1;
312 
314  if (ret != 0)
315  av_log(h, AV_LOG_ERROR, "pthread_join(): %s\n", av_err2str(ret));
316 
320  ffurl_close(c->inner);
321  ring_destroy(&c->ring);
322 
323  return 0;
324 }
325 
326 static int async_read_internal(URLContext *h, void *dest, int size, int read_complete,
327  void (*func)(void*, void*, int))
328 {
329  Context *c = h->priv_data;
330  RingBuffer *ring = &c->ring;
331  int to_read = size;
332  int ret = 0;
333 
335 
336  while (to_read > 0) {
337  int fifo_size, to_copy;
338  if (async_check_interrupt(h)) {
339  ret = AVERROR_EXIT;
340  break;
341  }
342  fifo_size = ring_size(ring);
343  to_copy = FFMIN(to_read, fifo_size);
344  if (to_copy > 0) {
345  ring_generic_read(ring, dest, to_copy, func);
346  if (!func)
347  dest = (uint8_t *)dest + to_copy;
348  c->logical_pos += to_copy;
349  to_read -= to_copy;
350  ret = size - to_read;
351 
352  if (to_read <= 0 || !read_complete)
353  break;
354  } else if (c->io_eof_reached) {
355  if (ret <= 0) {
356  if (c->io_error)
357  ret = c->io_error;
358  else
359  ret = AVERROR_EOF;
360  }
361  break;
362  }
365  }
366 
369 
370  return ret;
371 }
372 
373 static int async_read(URLContext *h, unsigned char *buf, int size)
374 {
375  return async_read_internal(h, buf, size, 0, NULL);
376 }
377 
378 static void fifo_do_not_copy_func(void* dest, void* src, int size) {
379  // do not copy
380 }
381 
382 static int64_t async_seek(URLContext *h, int64_t pos, int whence)
383 {
384  Context *c = h->priv_data;
385  RingBuffer *ring = &c->ring;
386  int64_t ret;
387  int64_t new_logical_pos;
388  int fifo_size;
389  int fifo_size_of_read_back;
390 
391  if (whence == AVSEEK_SIZE) {
392  av_log(h, AV_LOG_TRACE, "async_seek: AVSEEK_SIZE: %"PRId64"\n", (int64_t)c->logical_size);
393  return c->logical_size;
394  } else if (whence == SEEK_CUR) {
395  av_log(h, AV_LOG_TRACE, "async_seek: %"PRId64"\n", pos);
396  new_logical_pos = pos + c->logical_pos;
397  } else if (whence == SEEK_SET){
398  av_log(h, AV_LOG_TRACE, "async_seek: %"PRId64"\n", pos);
399  new_logical_pos = pos;
400  } else {
401  return AVERROR(EINVAL);
402  }
403  if (new_logical_pos < 0)
404  return AVERROR(EINVAL);
405 
406  fifo_size = ring_size(ring);
407  fifo_size_of_read_back = ring_size_of_read_back(ring);
408  if (new_logical_pos == c->logical_pos) {
409  /* current position */
410  return c->logical_pos;
411  } else if ((new_logical_pos >= (c->logical_pos - fifo_size_of_read_back)) &&
412  (new_logical_pos < (c->logical_pos + fifo_size + SHORT_SEEK_THRESHOLD))) {
413  int pos_delta = (int)(new_logical_pos - c->logical_pos);
414  /* fast seek */
415  av_log(h, AV_LOG_TRACE, "async_seek: fask_seek %"PRId64" from %d dist:%d/%d\n",
416  new_logical_pos, (int)c->logical_pos,
417  (int)(new_logical_pos - c->logical_pos), fifo_size);
418 
419  if (pos_delta > 0) {
420  // fast seek forwards
422  } else {
423  // fast seek backwards
424  ring_drain(ring, pos_delta);
425  c->logical_pos = new_logical_pos;
426  }
427 
428  return c->logical_pos;
429  } else if (c->logical_size <= 0) {
430  /* can not seek */
431  return AVERROR(EINVAL);
432  } else if (new_logical_pos > c->logical_size) {
433  /* beyond end */
434  return AVERROR(EINVAL);
435  }
436 
438 
439  c->seek_request = 1;
440  c->seek_pos = new_logical_pos;
441  c->seek_whence = SEEK_SET;
442  c->seek_completed = 0;
443  c->seek_ret = 0;
444 
445  while (1) {
446  if (async_check_interrupt(h)) {
447  ret = AVERROR_EXIT;
448  break;
449  }
450  if (c->seek_completed) {
451  if (c->seek_ret >= 0)
452  c->logical_pos = c->seek_ret;
453  ret = c->seek_ret;
454  break;
455  }
458  }
459 
461 
462  return ret;
463 }
464 
465 #define OFFSET(x) offsetof(Context, x)
466 #define D AV_OPT_FLAG_DECODING_PARAM
467 
468 static const AVOption options[] = {
469  {NULL},
470 };
471 
472 #undef D
473 #undef OFFSET
474 
475 static const AVClass async_context_class = {
476  .class_name = "Async",
477  .item_name = av_default_item_name,
478  .option = options,
479  .version = LIBAVUTIL_VERSION_INT,
480 };
481 
483  .name = "async",
484  .url_open2 = async_open,
485  .url_read = async_read,
486  .url_seek = async_seek,
487  .url_close = async_close,
488  .priv_data_size = sizeof(Context),
489  .priv_data_class = &async_context_class,
490 };
491 
492 #if 0
493 
494 #define TEST_SEEK_POS (1536)
495 #define TEST_STREAM_SIZE (2048)
496 
497 typedef struct TestContext {
498  AVClass *class;
499  int64_t logical_pos;
500  int64_t logical_size;
501 
502  /* options */
503  int opt_read_error;
504 } TestContext;
505 
506 static int async_test_open(URLContext *h, const char *arg, int flags, AVDictionary **options)
507 {
508  TestContext *c = h->priv_data;
509  c->logical_pos = 0;
510  c->logical_size = TEST_STREAM_SIZE;
511  return 0;
512 }
513 
514 static int async_test_close(URLContext *h)
515 {
516  return 0;
517 }
518 
519 static int async_test_read(URLContext *h, unsigned char *buf, int size)
520 {
521  TestContext *c = h->priv_data;
522  int i;
523  int read_len = 0;
524 
525  if (c->opt_read_error)
526  return c->opt_read_error;
527 
528  if (c->logical_pos >= c->logical_size)
529  return AVERROR_EOF;
530 
531  for (i = 0; i < size; ++i) {
532  buf[i] = c->logical_pos & 0xFF;
533 
534  c->logical_pos++;
535  read_len++;
536 
537  if (c->logical_pos >= c->logical_size)
538  break;
539  }
540 
541  return read_len;
542 }
543 
544 static int64_t async_test_seek(URLContext *h, int64_t pos, int whence)
545 {
546  TestContext *c = h->priv_data;
547  int64_t new_logical_pos;
548 
549  if (whence == AVSEEK_SIZE) {
550  return c->logical_size;
551  } else if (whence == SEEK_CUR) {
552  new_logical_pos = pos + c->logical_pos;
553  } else if (whence == SEEK_SET){
554  new_logical_pos = pos;
555  } else {
556  return AVERROR(EINVAL);
557  }
558  if (new_logical_pos < 0)
559  return AVERROR(EINVAL);
560 
561  c->logical_pos = new_logical_pos;
562  return new_logical_pos;
563 }
564 
565 #define OFFSET(x) offsetof(TestContext, x)
566 #define D AV_OPT_FLAG_DECODING_PARAM
567 
568 static const AVOption async_test_options[] = {
569  { "async-test-read-error", "cause read fail",
570  OFFSET(opt_read_error), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, .flags = D },
571  {NULL},
572 };
573 
574 #undef D
575 #undef OFFSET
576 
577 static const AVClass async_test_context_class = {
578  .class_name = "Async-Test",
579  .item_name = av_default_item_name,
580  .option = async_test_options,
581  .version = LIBAVUTIL_VERSION_INT,
582 };
583 
584 const URLProtocol ff_async_test_protocol = {
585  .name = "async-test",
586  .url_open2 = async_test_open,
587  .url_read = async_test_read,
588  .url_seek = async_test_seek,
589  .url_close = async_test_close,
590  .priv_data_size = sizeof(TestContext),
591  .priv_data_class = &async_test_context_class,
592 };
593 
594 int main(void)
595 {
596  URLContext *h = NULL;
597  int i;
598  int ret;
599  int64_t size;
600  int64_t pos;
601  int64_t read_len;
602  unsigned char buf[4096];
604 
605  ffurl_register_protocol(&ff_async_protocol);
606  ffurl_register_protocol(&ff_async_test_protocol);
607 
608  /*
609  * test normal read
610  */
611  ret = ffurl_open(&h, "async:async-test:", AVIO_FLAG_READ, NULL, NULL);
612  printf("open: %d\n", ret);
613 
614  size = ffurl_size(h);
615  printf("size: %"PRId64"\n", size);
616 
617  pos = ffurl_seek(h, 0, SEEK_CUR);
618  read_len = 0;
619  while (1) {
620  ret = ffurl_read(h, buf, sizeof(buf));
621  if (ret == AVERROR_EOF) {
622  printf("read-error: AVERROR_EOF at %"PRId64"\n", ffurl_seek(h, 0, SEEK_CUR));
623  break;
624  }
625  else if (ret == 0)
626  break;
627  else if (ret < 0) {
628  printf("read-error: %d at %"PRId64"\n", ret, ffurl_seek(h, 0, SEEK_CUR));
629  goto fail;
630  } else {
631  for (i = 0; i < ret; ++i) {
632  if (buf[i] != (pos & 0xFF)) {
633  printf("read-mismatch: actual %d, expecting %d, at %"PRId64"\n",
634  (int)buf[i], (int)(pos & 0xFF), pos);
635  break;
636  }
637  pos++;
638  }
639  }
640 
641  read_len += ret;
642  }
643  printf("read: %"PRId64"\n", read_len);
644 
645  /*
646  * test normal seek
647  */
648  ret = ffurl_read(h, buf, 1);
649  printf("read: %d\n", ret);
650 
651  pos = ffurl_seek(h, TEST_SEEK_POS, SEEK_SET);
652  printf("seek: %"PRId64"\n", pos);
653 
654  read_len = 0;
655  while (1) {
656  ret = ffurl_read(h, buf, sizeof(buf));
657  if (ret == AVERROR_EOF)
658  break;
659  else if (ret == 0)
660  break;
661  else if (ret < 0) {
662  printf("read-error: %d at %"PRId64"\n", ret, ffurl_seek(h, 0, SEEK_CUR));
663  goto fail;
664  } else {
665  for (i = 0; i < ret; ++i) {
666  if (buf[i] != (pos & 0xFF)) {
667  printf("read-mismatch: actual %d, expecting %d, at %"PRId64"\n",
668  (int)buf[i], (int)(pos & 0xFF), pos);
669  break;
670  }
671  pos++;
672  }
673  }
674 
675  read_len += ret;
676  }
677  printf("read: %"PRId64"\n", read_len);
678 
679  ret = ffurl_read(h, buf, 1);
680  printf("read: %d\n", ret);
681 
682  /*
683  * test read error
684  */
685  ffurl_close(h);
686  av_dict_set_int(&opts, "async-test-read-error", -10000, 0);
687  ret = ffurl_open(&h, "async:async-test:", AVIO_FLAG_READ, NULL, &opts);
688  printf("open: %d\n", ret);
689 
690  ret = ffurl_read(h, buf, 1);
691  printf("read: %d\n", ret);
692 
693 fail:
694  av_dict_free(&opts);
695  ffurl_close(h);
696  return 0;
697 }
698 
699 #endif
Definition: async.c:56
static int wrapped_url_read(void *src, void *dst, int size)
Definition: async.c:164
#define NULL
Definition: coverity.c:32
#define READ_BACK_CAPACITY
Definition: async.c:45
static av_always_inline int pthread_mutex_destroy(pthread_mutex_t *mutex)
Definition: os2threads.h:108
int ffurl_open_whitelist(URLContext **puc, const char *filename, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options, const char *whitelist, const char *blacklist, URLContext *parent)
Create an URLContext for accessing to the resource indicated by url, and open it. ...
Definition: avio.c:307
int io_error
Definition: async.c:67
#define pthread_mutex_lock(a)
Definition: ffprobe.c:61
int inner_io_error
Definition: async.c:66
static int async_check_interrupt(void *arg)
Definition: async.c:150
static av_always_inline int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
Definition: os2threads.h:166
AVOption.
Definition: opt.h:246
int read_pos
Definition: async.c:53
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
static int async_read_internal(URLContext *h, void *dest, int size, int read_complete, void(*func)(void *, void *, int))
Definition: async.c:326
int is_streamed
true if streamed (no seek possible), default = false
Definition: url.h:45
AVIOInterruptCB interrupt_callback
Definition: url.h:47
#define AVIO_FLAG_READ
read-only
Definition: avio.h:654
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
AVFifoBuffer * fifo
Definition: async.c:50
pthread_mutex_t mutex
Definition: async.c:76
static const AVClass async_context_class
Definition: async.c:475
static int ring_size(RingBuffer *ring)
Definition: async.c:105
#define src
Definition: vp8dsp.c:254
#define D
Definition: async.c:466
static av_always_inline int pthread_cond_destroy(pthread_cond_t *cond)
Definition: os2threads.h:140
static int ring_space(RingBuffer *ring)
Definition: async.c:110
static const AVOption options[]
Definition: async.c:468
int av_fifo_generic_write(AVFifoBuffer *f, void *src, int size, int(*func)(void *, void *, int))
Feed data from a user-supplied callback to an AVFifoBuffer.
Definition: fifo.c:122
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
static int ring_drain(RingBuffer *ring, int offset)
Definition: async.c:142
static int ring_generic_write(RingBuffer *ring, void *src, int size, int(*func)(void *, void *, int))
Definition: async.c:131
uint8_t
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:64
AVOptions.
const URLProtocol ff_async_protocol
Definition: async.c:482
#define AV_LOG_TRACE
Extremely verbose debugging, useful for libav* development.
Definition: log.h:202
int av_fifo_space(const AVFifoBuffer *f)
Return the amount of space in bytes in the AVFifoBuffer, that is the amount of data you can write int...
Definition: fifo.c:82
#define SHORT_SEEK_THRESHOLD
Definition: async.c:46
static int ring_generic_read(RingBuffer *ring, void *dest, int buf_size, void(*func)(void *, void *, int))
Definition: async.c:115
#define AVERROR_EOF
End of file.
Definition: error.h:55
static av_always_inline int pthread_cond_signal(pthread_cond_t *cond)
Definition: os2threads.h:148
ptrdiff_t size
Definition: opengl_enc.c:101
int main(int argc, char *argv[])
Definition: avio_dir_cmd.c:134
#define flags(name, subs,...)
Definition: cbs_h2645.c:263
#define av_log(a,...)
static void * async_buffer_task(void *arg)
Definition: async.c:176
Callback for checking whether to abort blocking functions.
Definition: avio.h:58
static int64_t async_seek(URLContext *h, int64_t pos, int whence)
Definition: async.c:382
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
error code definitions
int64_t logical_pos
Definition: async.c:70
int(* callback)(void *)
Definition: avio.h:59
const char * protocol_whitelist
Definition: url.h:49
#define AVERROR(e)
Definition: error.h:43
void av_dict_free(AVDictionary **pm)
Free all the memory allocated for an AVDictionary struct and all keys and values. ...
Definition: dict.c:203
const char * arg
Definition: jacosubdec.c:66
simple assert() macros that are a bit more flexible than ISO C assert().
URLContext * inner
Definition: async.c:58
static void fifo_do_not_copy_func(void *dest, void *src, int size)
Definition: async.c:378
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
#define fail()
Definition: checkasm.h:117
static int async_open(URLContext *h, const char *arg, int flags, AVDictionary **options)
Definition: async.c:240
#define OFFSET(x)
Definition: async.c:465
AVDictionary * opts
Definition: movenc.c:50
#define FFMIN(a, b)
Definition: common.h:96
#define av_err2str(errnum)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: error.h:119
AVIOInterruptCB interrupt_callback
Definition: async.c:80
static av_always_inline int pthread_join(pthread_t thread, void **value_ptr)
Definition: os2threads.h:90
static av_always_inline int pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *attr)
Definition: os2threads.h:100
int seek_whence
Definition: async.c:62
#define pthread_mutex_unlock(a)
Definition: ffprobe.c:65
int abort_request
Definition: async.c:79
#define AVERROR_EXIT
Immediate exit was requested; the called function should not be restarted.
Definition: error.h:56
int seek_request
Definition: async.c:60
static av_always_inline int pthread_create(pthread_t *thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
Definition: os2threads.h:76
const char * protocol_blacklist
Definition: url.h:50
int ff_check_interrupt(AVIOInterruptCB *cb)
Check if the user has requested to interrupt a blocking function associated with cb.
Definition: avio.c:664
int av_fifo_size(const AVFifoBuffer *f)
Return the amount of data in bytes in the AVFifoBuffer, that is the amount of data you can read from ...
Definition: fifo.c:77
int av_fifo_generic_peek_at(AVFifoBuffer *f, void *dest, int offset, int buf_size, void(*func)(void *, void *, int))
Feed data at specific position from an AVFifoBuffer to a user-supplied callback.
Definition: fifo.c:151
pthread_t async_buffer_thread
Definition: async.c:77
int64_t ffurl_size(URLContext *h)
Return the filesize of the resource accessed by h, AVERROR(ENOSYS) if the operation is not supported ...
Definition: avio.c:611
a very simple circular buffer FIFO implementation
void * buf
Definition: avisynth_c.h:690
Definition: url.h:38
int64_t seek_pos
Definition: async.c:61
int seek_completed
Definition: async.c:63
Describe the class of an AVClass context structure.
Definition: log.h:67
int64_t logical_size
Definition: async.c:71
void * priv_data
Definition: url.h:41
int(* func)(AVBPrint *dst, const char *in, const char *arg)
Definition: jacosubdec.c:67
static void ring_destroy(RingBuffer *ring)
Definition: async.c:94
static int ring_size_of_read_back(RingBuffer *ring)
Definition: async.c:137
RingBuffer ring
Definition: async.c:72
const char * name
Definition: url.h:55
static int ring_init(RingBuffer *ring, unsigned int capacity, int read_back_capacity)
Definition: async.c:83
int ffurl_close(URLContext *h)
Definition: avio.c:467
static void ring_reset(RingBuffer *ring)
Definition: async.c:99
int read_back_capacity
Definition: async.c:51
int av_strstart(const char *str, const char *pfx, const char **ptr)
Return non-zero if pfx is a prefix of str.
Definition: avstring.c:34
int
_fmutex pthread_mutex_t
Definition: os2threads.h:49
int64_t ffurl_seek(URLContext *h, int64_t pos, int whence)
Change the position that will be used by the next read/write operation on the resource accessed by h...
Definition: avio.c:434
int ffurl_open(URLContext **puc, const char *filename, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options)
Definition: avio.c:355
static double c[64]
int av_dict_set_int(AVDictionary **pm, const char *key, int64_t value, int flags)
Convenience wrapper for av_dict_set that converts the value to a string and stores it...
Definition: dict.c:147
static av_always_inline int pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *attr)
Definition: os2threads.h:129
#define AVSEEK_SIZE
ORing this as the "whence" parameter to a seek function causes it to return the filesize without seek...
Definition: avio.h:531
pthread_cond_t cond_wakeup_main
Definition: async.c:74
int64_t seek_ret
Definition: async.c:64
AVFifoBuffer * av_fifo_alloc(unsigned int size)
Initialize an AVFifoBuffer.
Definition: fifo.c:43
static int async_close(URLContext *h)
Definition: async.c:303
#define BUFFER_CAPACITY
support timeout support work with concatdec, hls
Definition: async.c:44
int io_eof_reached
Definition: async.c:68
unbuffered private I/O API
void av_fifo_freep(AVFifoBuffer **f)
Free an AVFifoBuffer and reset pointer to NULL.
Definition: fifo.c:63
void av_fifo_reset(AVFifoBuffer *f)
Reset the AVFifoBuffer to the state right after av_fifo_alloc, in particular it is emptied...
Definition: fifo.c:71
void av_fifo_drain(AVFifoBuffer *f, int size)
Discard data from the FIFO.
Definition: fifo.c:233
static int async_read(URLContext *h, unsigned char *buf, int size)
Definition: async.c:373
int ffurl_read(URLContext *h, unsigned char *buf, int size)
Read up to size bytes from the resource accessed by h, and store the read bytes in buf...
Definition: avio.c:407
pthread_cond_t cond_wakeup_background
Definition: async.c:75