FFmpeg coverage

Line	Branch	Exec	Source
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 <inttypes.h>
31			#include <string.h>
32
33			#include "libavutil/avassert.h"
34			#include "libavutil/avstring.h"
35			#include "libavutil/error.h"
36			#include "libavutil/fifo.h"
37			#include "libavutil/log.h"
38			#include "libavutil/opt.h"
39			#include "libavutil/thread.h"
40			#include "url.h"
41
42			#if HAVE_UNISTD_H
43			#include <unistd.h>
44			#endif
45
46			#define BUFFER_CAPACITY (4 * 1024 * 1024)
47			#define READ_BACK_CAPACITY (4 * 1024 * 1024)
48			#define SHORT_SEEK_THRESHOLD (256 * 1024)
49
50			typedef struct RingBuffer
51			{
52			AVFifo *fifo;
53			int read_back_capacity;
54
55			int read_pos;
56			} RingBuffer;
57
58			typedef struct AsyncContext {
59			AVClass *class;
60			URLContext *inner;
61
62			int seek_request;
63			int64_t seek_pos;
64			int seek_whence;
65			int seek_completed;
66			int64_t seek_ret;
67
68			int inner_io_error;
69			int io_error;
70			int io_eof_reached;
71
72			int64_t logical_pos;
73			int64_t logical_size;
74			RingBuffer ring;
75
76			pthread_cond_t cond_wakeup_main;
77			pthread_cond_t cond_wakeup_background;
78			pthread_mutex_t mutex;
79			pthread_t async_buffer_thread;
80
81			int abort_request;
82			AVIOInterruptCB interrupt_callback;
83			} AsyncContext;
84
85		✗	static int ring_init(RingBuffer *ring, unsigned int capacity, int read_back_capacity)
86			{
87		✗	memset(ring, 0, sizeof(RingBuffer));
88		✗	ring->fifo = av_fifo_alloc2(capacity + read_back_capacity, 1, 0);
89		✗	if (!ring->fifo)
90		✗	return AVERROR(ENOMEM);
91
92		✗	ring->read_back_capacity = read_back_capacity;
93		✗	return 0;
94			}
95
96		✗	static void ring_destroy(RingBuffer *ring)
97			{
98		✗	av_fifo_freep2(&ring->fifo);
99		✗	}
100
101		✗	static void ring_reset(RingBuffer *ring)
102			{
103		✗	av_fifo_reset2(ring->fifo);
104		✗	ring->read_pos = 0;
105		✗	}
106
107		✗	static int ring_size(RingBuffer *ring)
108			{
109		✗	return av_fifo_can_read(ring->fifo) - ring->read_pos;
110			}
111
112		✗	static int ring_space(RingBuffer *ring)
113			{
114		✗	return av_fifo_can_write(ring->fifo);
115			}
116
117		✗	static int ring_read(RingBuffer *ring, void *dest, int buf_size)
118			{
119		✗	int ret = 0;
120
121			av_assert2(buf_size <= ring_size(ring));
122		✗	if (dest)
123		✗	ret = av_fifo_peek(ring->fifo, dest, buf_size, ring->read_pos);
124		✗	ring->read_pos += buf_size;
125
126		✗	if (ring->read_pos > ring->read_back_capacity) {
127		✗	av_fifo_drain2(ring->fifo, ring->read_pos - ring->read_back_capacity);
128		✗	ring->read_pos = ring->read_back_capacity;
129			}
130
131		✗	return ret;
132			}
133
134		✗	static int wrapped_url_read(void *src, void *dst, size_t *size)
135			{
136		✗	URLContext *h = src;
137		✗	AsyncContext *c = h->priv_data;
138			int ret;
139
140		✗	ret = ffurl_read(c->inner, dst, *size);
141		✗	*size = ret > 0 ? ret : 0;
142		✗	c->inner_io_error = ret < 0 ? ret : 0;
143
144		✗	return c->inner_io_error;
145			}
146
147		✗	static int ring_write(RingBuffer *ring, URLContext *h, size_t size)
148			{
149			int ret;
150
151			av_assert2(size <= ring_space(ring));
152		✗	ret = av_fifo_write_from_cb(ring->fifo, wrapped_url_read, h, &size);
153		✗	if (ret < 0)
154		✗	return ret;
155
156		✗	return size;
157			}
158
159		✗	static int ring_size_of_read_back(RingBuffer *ring)
160			{
161		✗	return ring->read_pos;
162			}
163
164		✗	static int ring_drain(RingBuffer *ring, int offset)
165			{
166			av_assert2(offset >= -ring_size_of_read_back(ring));
167			av_assert2(offset <= ring_size(ring));
168		✗	ring->read_pos += offset;
169		✗	return 0;
170			}
171
172		✗	static int async_check_interrupt(void *arg)
173			{
174		✗	URLContext *h = arg;
175		✗	AsyncContext *c = h->priv_data;
176
177		✗	if (c->abort_request)
178		✗	return 1;
179
180		✗	if (ff_check_interrupt(&c->interrupt_callback))
181		✗	c->abort_request = 1;
182
183		✗	return c->abort_request;
184			}
185
186		✗	static void *async_buffer_task(void *arg)
187			{
188		✗	URLContext *h = arg;
189		✗	AsyncContext *c = h->priv_data;
190		✗	RingBuffer *ring = &c->ring;
191		✗	int ret = 0;
192			int64_t seek_ret;
193
194		✗	ff_thread_setname("async");
195
196		✗	while (1) {
197			int fifo_space, to_copy;
198
199		✗	pthread_mutex_lock(&c->mutex);
200		✗	if (async_check_interrupt(h)) {
201		✗	c->io_eof_reached = 1;
202		✗	c->io_error = AVERROR_EXIT;
203		✗	pthread_cond_signal(&c->cond_wakeup_main);
204		✗	pthread_mutex_unlock(&c->mutex);
205		✗	break;
206			}
207
208		✗	if (c->seek_request) {
209		✗	seek_ret = ffurl_seek(c->inner, c->seek_pos, c->seek_whence);
210		✗	if (seek_ret >= 0) {
211		✗	c->io_eof_reached = 0;
212		✗	c->io_error = 0;
213		✗	ring_reset(ring);
214			}
215
216		✗	c->seek_completed = 1;
217		✗	c->seek_ret = seek_ret;
218		✗	c->seek_request = 0;
219
220
221		✗	pthread_cond_signal(&c->cond_wakeup_main);
222		✗	pthread_mutex_unlock(&c->mutex);
223		✗	continue;
224			}
225
226		✗	fifo_space = ring_space(ring);
227		✗	if (c->io_eof_reached || fifo_space <= 0) {
228		✗	pthread_cond_signal(&c->cond_wakeup_main);
229		✗	pthread_cond_wait(&c->cond_wakeup_background, &c->mutex);
230		✗	pthread_mutex_unlock(&c->mutex);
231		✗	continue;
232			}
233		✗	pthread_mutex_unlock(&c->mutex);
234
235		✗	to_copy = FFMIN(4096, fifo_space);
236		✗	ret = ring_write(ring, h, to_copy);
237
238		✗	pthread_mutex_lock(&c->mutex);
239		✗	if (ret <= 0) {
240		✗	c->io_eof_reached = 1;
241		✗	if (c->inner_io_error < 0)
242		✗	c->io_error = c->inner_io_error;
243			}
244
245		✗	pthread_cond_signal(&c->cond_wakeup_main);
246		✗	pthread_mutex_unlock(&c->mutex);
247			}
248
249		✗	return NULL;
250			}
251
252		✗	static int async_open(URLContext *h, const char *arg, int flags, AVDictionary **options)
253			{
254		✗	AsyncContext *c = h->priv_data;
255			int ret;
256		✗	AVIOInterruptCB interrupt_callback = {.callback = async_check_interrupt, .opaque = h};
257
258		✗	av_strstart(arg, "async:", &arg);
259
260		✗	ret = ring_init(&c->ring, BUFFER_CAPACITY, READ_BACK_CAPACITY);
261		✗	if (ret < 0)
262		✗	goto fifo_fail;
263
264			/* wrap interrupt callback */
265		✗	c->interrupt_callback = h->interrupt_callback;
266		✗	ret = ffurl_open_whitelist(&c->inner, arg, flags, &interrupt_callback, options, h->protocol_whitelist, h->protocol_blacklist, h);
267		✗	if (ret != 0) {
268		✗	av_log(h, AV_LOG_ERROR, "ffurl_open failed : %s, %s\n", av_err2str(ret), arg);
269		✗	goto url_fail;
270			}
271
272		✗	c->logical_size = ffurl_size(c->inner);
273		✗	h->is_streamed = c->inner->is_streamed;
274
275		✗	ret = pthread_mutex_init(&c->mutex, NULL);
276		✗	if (ret != 0) {
277		✗	ret = AVERROR(ret);
278		✗	av_log(h, AV_LOG_ERROR, "pthread_mutex_init failed : %s\n", av_err2str(ret));
279		✗	goto mutex_fail;
280			}
281
282		✗	ret = pthread_cond_init(&c->cond_wakeup_main, NULL);
283		✗	if (ret != 0) {
284		✗	ret = AVERROR(ret);
285		✗	av_log(h, AV_LOG_ERROR, "pthread_cond_init failed : %s\n", av_err2str(ret));
286		✗	goto cond_wakeup_main_fail;
287			}
288
289		✗	ret = pthread_cond_init(&c->cond_wakeup_background, NULL);
290		✗	if (ret != 0) {
291		✗	ret = AVERROR(ret);
292		✗	av_log(h, AV_LOG_ERROR, "pthread_cond_init failed : %s\n", av_err2str(ret));
293		✗	goto cond_wakeup_background_fail;
294			}
295
296		✗	ret = pthread_create(&c->async_buffer_thread, NULL, async_buffer_task, h);
297		✗	if (ret) {
298		✗	ret = AVERROR(ret);
299		✗	av_log(h, AV_LOG_ERROR, "pthread_create failed : %s\n", av_err2str(ret));
300		✗	goto thread_fail;
301			}
302
303		✗	return 0;
304
305		✗	thread_fail:
306		✗	pthread_cond_destroy(&c->cond_wakeup_background);
307		✗	cond_wakeup_background_fail:
308		✗	pthread_cond_destroy(&c->cond_wakeup_main);
309		✗	cond_wakeup_main_fail:
310		✗	pthread_mutex_destroy(&c->mutex);
311		✗	mutex_fail:
312		✗	ffurl_closep(&c->inner);
313		✗	url_fail:
314		✗	ring_destroy(&c->ring);
315		✗	fifo_fail:
316		✗	return ret;
317			}
318
319		✗	static int async_close(URLContext *h)
320			{
321		✗	AsyncContext *c = h->priv_data;
322			int ret;
323
324		✗	pthread_mutex_lock(&c->mutex);
325		✗	c->abort_request = 1;
326		✗	pthread_cond_signal(&c->cond_wakeup_background);
327		✗	pthread_mutex_unlock(&c->mutex);
328
329		✗	ret = pthread_join(c->async_buffer_thread, NULL);
330		✗	if (ret != 0)
331		✗	av_log(h, AV_LOG_ERROR, "pthread_join(): %s\n", av_err2str(ret));
332
333		✗	pthread_cond_destroy(&c->cond_wakeup_background);
334		✗	pthread_cond_destroy(&c->cond_wakeup_main);
335		✗	pthread_mutex_destroy(&c->mutex);
336		✗	ffurl_closep(&c->inner);
337		✗	ring_destroy(&c->ring);
338
339		✗	return 0;
340			}
341
342		✗	static int async_read_internal(URLContext *h, void *dest, int size)
343			{
344		✗	AsyncContext *c = h->priv_data;
345		✗	RingBuffer *ring = &c->ring;
346		✗	int read_complete = !dest;
347		✗	int to_read = size;
348		✗	int ret = 0;
349
350		✗	pthread_mutex_lock(&c->mutex);
351
352		✗	while (to_read > 0) {
353			int fifo_size, to_copy;
354		✗	if (async_check_interrupt(h)) {
355		✗	ret = AVERROR_EXIT;
356		✗	break;
357			}
358		✗	fifo_size = ring_size(ring);
359		✗	to_copy = FFMIN(to_read, fifo_size);
360		✗	if (to_copy > 0) {
361		✗	ring_read(ring, dest, to_copy);
362		✗	if (dest)
363		✗	dest = (uint8_t *)dest + to_copy;
364		✗	c->logical_pos += to_copy;
365		✗	to_read -= to_copy;
366		✗	ret = size - to_read;
367
368		✗	if (to_read <= 0 || !read_complete)
369			break;
370		✗	} else if (c->io_eof_reached) {
371		✗	if (ret <= 0) {
372		✗	if (c->io_error)
373		✗	ret = c->io_error;
374			else
375		✗	ret = AVERROR_EOF;
376			}
377		✗	break;
378			}
379		✗	pthread_cond_signal(&c->cond_wakeup_background);
380		✗	pthread_cond_wait(&c->cond_wakeup_main, &c->mutex);
381			}
382
383		✗	pthread_cond_signal(&c->cond_wakeup_background);
384		✗	pthread_mutex_unlock(&c->mutex);
385
386		✗	return ret;
387			}
388
389		✗	static int async_read(URLContext *h, unsigned char *buf, int size)
390			{
391		✗	return async_read_internal(h, buf, size);
392			}
393
394		✗	static int64_t async_seek(URLContext *h, int64_t pos, int whence)
395			{
396		✗	AsyncContext *c = h->priv_data;
397		✗	RingBuffer *ring = &c->ring;
398			int64_t ret;
399			int64_t new_logical_pos;
400			int fifo_size;
401			int fifo_size_of_read_back;
402
403		✗	if (whence == AVSEEK_SIZE) {
404		✗	av_log(h, AV_LOG_TRACE, "async_seek: AVSEEK_SIZE: %"PRId64"\n", (int64_t)c->logical_size);
405		✗	return c->logical_size;
406		✗	} else if (whence == SEEK_CUR) {
407		✗	av_log(h, AV_LOG_TRACE, "async_seek: %"PRId64"\n", pos);
408		✗	new_logical_pos = pos + c->logical_pos;
409		✗	} else if (whence == SEEK_SET){
410		✗	av_log(h, AV_LOG_TRACE, "async_seek: %"PRId64"\n", pos);
411		✗	new_logical_pos = pos;
412			} else {
413		✗	return AVERROR(EINVAL);
414			}
415		✗	if (new_logical_pos < 0)
416		✗	return AVERROR(EINVAL);
417
418		✗	fifo_size = ring_size(ring);
419		✗	fifo_size_of_read_back = ring_size_of_read_back(ring);
420		✗	if (new_logical_pos == c->logical_pos) {
421			/* current position */
422		✗	return c->logical_pos;
423		✗	} else if ((new_logical_pos >= (c->logical_pos - fifo_size_of_read_back)) &&
424		✗	(new_logical_pos < (c->logical_pos + fifo_size + SHORT_SEEK_THRESHOLD))) {
425		✗	int pos_delta = (int)(new_logical_pos - c->logical_pos);
426			/* fast seek */
427		✗	av_log(h, AV_LOG_TRACE, "async_seek: fask_seek %"PRId64" from %d dist:%d/%d\n",
428		✗	new_logical_pos, (int)c->logical_pos,
429		✗	(int)(new_logical_pos - c->logical_pos), fifo_size);
430
431		✗	if (pos_delta > 0) {
432			// fast seek forwards
433		✗	async_read_internal(h, NULL, pos_delta);
434			} else {
435			// fast seek backwards
436		✗	ring_drain(ring, pos_delta);
437		✗	c->logical_pos = new_logical_pos;
438			}
439
440		✗	return c->logical_pos;
441		✗	} else if (c->logical_size <= 0) {
442			/* can not seek */
443		✗	return AVERROR(EINVAL);
444		✗	} else if (new_logical_pos > c->logical_size) {
445			/* beyond end */
446		✗	return AVERROR(EINVAL);
447			}
448
449		✗	pthread_mutex_lock(&c->mutex);
450
451		✗	c->seek_request = 1;
452		✗	c->seek_pos = new_logical_pos;
453		✗	c->seek_whence = SEEK_SET;
454		✗	c->seek_completed = 0;
455		✗	c->seek_ret = 0;
456
457			while (1) {
458		✗	if (async_check_interrupt(h)) {
459		✗	ret = AVERROR_EXIT;
460		✗	break;
461			}
462		✗	if (c->seek_completed) {
463		✗	if (c->seek_ret >= 0)
464		✗	c->logical_pos = c->seek_ret;
465		✗	ret = c->seek_ret;
466		✗	break;
467			}
468		✗	pthread_cond_signal(&c->cond_wakeup_background);
469		✗	pthread_cond_wait(&c->cond_wakeup_main, &c->mutex);
470			}
471
472		✗	pthread_mutex_unlock(&c->mutex);
473
474		✗	return ret;
475			}
476
477			#define OFFSET(x) offsetof(AsyncContext, x)
478			#define D AV_OPT_FLAG_DECODING_PARAM
479
480			static const AVOption options[] = {
481			{NULL},
482			};
483
484			#undef D
485			#undef OFFSET
486
487			static const AVClass async_context_class = {
488			.class_name = "Async",
489			.item_name = av_default_item_name,
490			.option = options,
491			.version = LIBAVUTIL_VERSION_INT,
492			};
493
494			const URLProtocol ff_async_protocol = {
495			.name = "async",
496			.url_open2 = async_open,
497			.url_read = async_read,
498			.url_seek = async_seek,
499			.url_close = async_close,
500			.priv_data_size = sizeof(AsyncContext),
501			.priv_data_class = &async_context_class,
502			};
503
504			#if 0
505
506			#define TEST_SEEK_POS (1536)
507			#define TEST_STREAM_SIZE (2048)
508
509			typedef struct TestContext {
510			AVClass *class;
511			int64_t logical_pos;
512			int64_t logical_size;
513
514			/* options */
515			int opt_read_error;
516			} TestContext;
517
518			static int async_test_open(URLContext *h, const char *arg, int flags, AVDictionary **options)
519			{
520			TestContext *c = h->priv_data;
521			c->logical_pos = 0;
522			c->logical_size = TEST_STREAM_SIZE;
523			return 0;
524			}
525
526			static int async_test_close(URLContext *h)
527			{
528			return 0;
529			}
530
531			static int async_test_read(URLContext *h, unsigned char *buf, int size)
532			{
533			TestContext *c = h->priv_data;
534			int i;
535			int read_len = 0;
536
537			if (c->opt_read_error)
538			return c->opt_read_error;
539
540			if (c->logical_pos >= c->logical_size)
541			return AVERROR_EOF;
542
543			for (i = 0; i < size; ++i) {
544			buf[i] = c->logical_pos & 0xFF;
545
546			c->logical_pos++;
547			read_len++;
548
549			if (c->logical_pos >= c->logical_size)
550			break;
551			}
552
553			return read_len;
554			}
555
556			static int64_t async_test_seek(URLContext *h, int64_t pos, int whence)
557			{
558			TestContext *c = h->priv_data;
559			int64_t new_logical_pos;
560
561			if (whence == AVSEEK_SIZE) {
562			return c->logical_size;
563			} else if (whence == SEEK_CUR) {
564			new_logical_pos = pos + c->logical_pos;
565			} else if (whence == SEEK_SET){
566			new_logical_pos = pos;
567			} else {
568			return AVERROR(EINVAL);
569			}
570			if (new_logical_pos < 0)
571			return AVERROR(EINVAL);
572
573			c->logical_pos = new_logical_pos;
574			return new_logical_pos;
575			}
576
577			#define OFFSET(x) offsetof(TestContext, x)
578			#define D AV_OPT_FLAG_DECODING_PARAM
579
580			static const AVOption async_test_options[] = {
581			{ "async-test-read-error", "cause read fail",
582			OFFSET(opt_read_error), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, .flags = D },
583			{NULL},
584			};
585
586			#undef D
587			#undef OFFSET
588
589			static const AVClass async_test_context_class = {
590			.class_name = "Async-Test",
591			.item_name = av_default_item_name,
592			.option = async_test_options,
593			.version = LIBAVUTIL_VERSION_INT,
594			};
595
596			const URLProtocol ff_async_test_protocol = {
597			.name = "async-test",
598			.url_open2 = async_test_open,
599			.url_read = async_test_read,
600			.url_seek = async_test_seek,
601			.url_close = async_test_close,
602			.priv_data_size = sizeof(TestContext),
603			.priv_data_class = &async_test_context_class,
604			};
605
606			int main(void)
607			{
608			URLContext *h = NULL;
609			int i;
610			int ret;
611			int64_t size;
612			int64_t pos;
613			int64_t read_len;
614			unsigned char buf[4096];
615			AVDictionary *opts = NULL;
616
617			ffurl_register_protocol(&ff_async_protocol);
618			ffurl_register_protocol(&ff_async_test_protocol);
619
620			/*
621			* test normal read
622			*/
623			ret = ffurl_open_whitelist(&h, "async:async-test:", AVIO_FLAG_READ,
624			NULL, NULL, NULL, NULL, NULL);
625			printf("open: %d\n", ret);
626
627			size = ffurl_size(h);
628			printf("size: %"PRId64"\n", size);
629
630			pos = ffurl_seek(h, 0, SEEK_CUR);
631			read_len = 0;
632			while (1) {
633			ret = ffurl_read(h, buf, sizeof(buf));
634			if (ret == AVERROR_EOF) {
635			printf("read-error: AVERROR_EOF at %"PRId64"\n", ffurl_seek(h, 0, SEEK_CUR));
636			break;
637			}
638			else if (ret == 0)
639			break;
640			else if (ret < 0) {
641			printf("read-error: %d at %"PRId64"\n", ret, ffurl_seek(h, 0, SEEK_CUR));
642			goto fail;
643			} else {
644			for (i = 0; i < ret; ++i) {
645			if (buf[i] != (pos & 0xFF)) {
646			printf("read-mismatch: actual %d, expecting %d, at %"PRId64"\n",
647			(int)buf[i], (int)(pos & 0xFF), pos);
648			break;
649			}
650			pos++;
651			}
652			}
653
654			read_len += ret;
655			}
656			printf("read: %"PRId64"\n", read_len);
657
658			/*
659			* test normal seek
660			*/
661			ret = ffurl_read(h, buf, 1);
662			printf("read: %d\n", ret);
663
664			pos = ffurl_seek(h, TEST_SEEK_POS, SEEK_SET);
665			printf("seek: %"PRId64"\n", pos);
666
667			read_len = 0;
668			while (1) {
669			ret = ffurl_read(h, buf, sizeof(buf));
670			if (ret == AVERROR_EOF)
671			break;
672			else if (ret == 0)
673			break;
674			else if (ret < 0) {
675			printf("read-error: %d at %"PRId64"\n", ret, ffurl_seek(h, 0, SEEK_CUR));
676			goto fail;
677			} else {
678			for (i = 0; i < ret; ++i) {
679			if (buf[i] != (pos & 0xFF)) {
680			printf("read-mismatch: actual %d, expecting %d, at %"PRId64"\n",
681			(int)buf[i], (int)(pos & 0xFF), pos);
682			break;
683			}
684			pos++;
685			}
686			}
687
688			read_len += ret;
689			}
690			printf("read: %"PRId64"\n", read_len);
691
692			ret = ffurl_read(h, buf, 1);
693			printf("read: %d\n", ret);
694
695			/*
696			* test read error
697			*/
698			ffurl_close(h);
699			av_dict_set_int(&opts, "async-test-read-error", -10000, 0);
700			ret = ffurl_open_whitelist(&h, "async:async-test:", AVIO_FLAG_READ,
701			NULL, &opts, NULL, NULL, NULL);
702			printf("open: %d\n", ret);
703
704			ret = ffurl_read(h, buf, 1);
705			printf("read: %d\n", ret);
706
707			fail:
708			av_dict_free(&opts);
709			ffurl_close(h);
710			return 0;
711			}
712
713			#endif
714