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 <stdatomic.h>
32			#include <string.h>
33
34			#include "libavutil/avassert.h"
35			#include "libavutil/avstring.h"
36			#include "libavutil/error.h"
37			#include "libavutil/fifo.h"
38			#include "libavutil/log.h"
39			#include "libavutil/opt.h"
40			#include "libavutil/thread.h"
41			#include "url.h"
42
43			#if HAVE_UNISTD_H
44			#include <unistd.h>
45			#endif
46
47			#define BUFFER_CAPACITY (4 * 1024 * 1024)
48			#define READ_BACK_CAPACITY (4 * 1024 * 1024)
49			#define SHORT_SEEK_THRESHOLD (256 * 1024)
50
51			typedef struct RingBuffer
52			{
53			AVFifo *fifo;
54			int read_back_capacity;
55
56			int read_pos;
57			} RingBuffer;
58
59			typedef struct AsyncContext {
60			AVClass *class;
61			URLContext *inner;
62
63			int seek_request;
64			int64_t seek_pos;
65			int seek_whence;
66			int seek_completed;
67			int64_t seek_ret;
68
69			int inner_io_error;
70			int io_error;
71			int io_eof_reached;
72
73			int64_t logical_pos;
74			int64_t logical_size;
75			RingBuffer ring;
76
77			pthread_cond_t cond_wakeup_main;
78			pthread_cond_t cond_wakeup_background;
79			pthread_mutex_t mutex;
80			pthread_t async_buffer_thread;
81
82			atomic_int abort_request;
83			AVIOInterruptCB interrupt_callback;
84			} AsyncContext;
85
86		✗	static int ring_init(RingBuffer *ring, unsigned int capacity, int read_back_capacity)
87			{
88		✗	memset(ring, 0, sizeof(RingBuffer));
89		✗	ring->fifo = av_fifo_alloc2(capacity + read_back_capacity, 1, 0);
90		✗	if (!ring->fifo)
91		✗	return AVERROR(ENOMEM);
92
93		✗	ring->read_back_capacity = read_back_capacity;
94		✗	return 0;
95			}
96
97		✗	static void ring_destroy(RingBuffer *ring)
98			{
99		✗	av_fifo_freep2(&ring->fifo);
100		✗	}
101
102		✗	static void ring_reset(RingBuffer *ring)
103			{
104		✗	av_fifo_reset2(ring->fifo);
105		✗	ring->read_pos = 0;
106		✗	}
107
108		✗	static int ring_size(RingBuffer *ring)
109			{
110		✗	return av_fifo_can_read(ring->fifo) - ring->read_pos;
111			}
112
113		✗	static int ring_space(RingBuffer *ring)
114			{
115		✗	return av_fifo_can_write(ring->fifo);
116			}
117
118		✗	static int ring_read(RingBuffer *ring, void *dest, int buf_size)
119			{
120		✗	int ret = 0;
121
122			av_assert2(buf_size <= ring_size(ring));
123		✗	if (dest)
124		✗	ret = av_fifo_peek(ring->fifo, dest, buf_size, ring->read_pos);
125		✗	ring->read_pos += buf_size;
126
127		✗	if (ring->read_pos > ring->read_back_capacity) {
128		✗	av_fifo_drain2(ring->fifo, ring->read_pos - ring->read_back_capacity);
129		✗	ring->read_pos = ring->read_back_capacity;
130			}
131
132		✗	return ret;
133			}
134
135		✗	static int wrapped_url_read(void *src, void *dst, size_t *size)
136			{
137		✗	URLContext *h = src;
138		✗	AsyncContext *c = h->priv_data;
139			int ret;
140
141		✗	ret = ffurl_read(c->inner, dst, *size);
142		✗	*size = ret > 0 ? ret : 0;
143		✗	c->inner_io_error = ret < 0 ? ret : 0;
144
145		✗	return c->inner_io_error;
146			}
147
148		✗	static int ring_write(RingBuffer *ring, URLContext *h, size_t size)
149			{
150			int ret;
151
152			av_assert2(size <= ring_space(ring));
153		✗	ret = av_fifo_write_from_cb(ring->fifo, wrapped_url_read, h, &size);
154		✗	if (ret < 0)
155		✗	return ret;
156
157		✗	return size;
158			}
159
160		✗	static int ring_size_of_read_back(RingBuffer *ring)
161			{
162		✗	return ring->read_pos;
163			}
164
165		✗	static int ring_drain(RingBuffer *ring, int offset)
166			{
167			av_assert2(offset >= -ring_size_of_read_back(ring));
168			av_assert2(offset <= ring_size(ring));
169		✗	ring->read_pos += offset;
170		✗	return 0;
171			}
172
173		✗	static int async_check_interrupt(void *arg)
174			{
175		✗	URLContext *h = arg;
176		✗	AsyncContext *c = h->priv_data;
177
178		✗	if (atomic_load(&c->abort_request))
179		✗	return 1;
180
181		✗	if (ff_check_interrupt(&c->interrupt_callback))
182		✗	atomic_store(&c->abort_request, 1);
183
184		✗	return atomic_load(&c->abort_request);
185			}
186
187		✗	static void *async_buffer_task(void *arg)
188			{
189		✗	URLContext *h = arg;
190		✗	AsyncContext *c = h->priv_data;
191		✗	RingBuffer *ring = &c->ring;
192		✗	int ret = 0;
193			int64_t seek_ret;
194
195		✗	ff_thread_setname("async");
196
197		✗	while (1) {
198			int fifo_space, to_copy;
199
200		✗	pthread_mutex_lock(&c->mutex);
201		✗	if (async_check_interrupt(h)) {
202		✗	c->io_eof_reached = 1;
203		✗	c->io_error = AVERROR_EXIT;
204		✗	pthread_cond_signal(&c->cond_wakeup_main);
205		✗	pthread_mutex_unlock(&c->mutex);
206		✗	break;
207			}
208
209		✗	if (c->seek_request) {
210		✗	seek_ret = ffurl_seek(c->inner, c->seek_pos, c->seek_whence);
211		✗	if (seek_ret >= 0) {
212		✗	c->io_eof_reached = 0;
213		✗	c->io_error = 0;
214		✗	ring_reset(ring);
215			}
216
217		✗	c->seek_completed = 1;
218		✗	c->seek_ret = seek_ret;
219		✗	c->seek_request = 0;
220
221
222		✗	pthread_cond_signal(&c->cond_wakeup_main);
223		✗	pthread_mutex_unlock(&c->mutex);
224		✗	continue;
225			}
226
227		✗	fifo_space = ring_space(ring);
228		✗	if (c->io_eof_reached || fifo_space <= 0) {
229		✗	pthread_cond_signal(&c->cond_wakeup_main);
230		✗	pthread_cond_wait(&c->cond_wakeup_background, &c->mutex);
231		✗	pthread_mutex_unlock(&c->mutex);
232		✗	continue;
233			}
234		✗	pthread_mutex_unlock(&c->mutex);
235
236		✗	to_copy = FFMIN(4096, fifo_space);
237		✗	ret = ring_write(ring, h, to_copy);
238
239		✗	pthread_mutex_lock(&c->mutex);
240		✗	if (ret <= 0) {
241		✗	c->io_eof_reached = 1;
242		✗	if (c->inner_io_error < 0)
243		✗	c->io_error = c->inner_io_error;
244			}
245
246		✗	pthread_cond_signal(&c->cond_wakeup_main);
247		✗	pthread_mutex_unlock(&c->mutex);
248			}
249
250		✗	return NULL;
251			}
252
253		✗	static int async_open(URLContext *h, const char *arg, int flags, AVDictionary **options)
254			{
255		✗	AsyncContext *c = h->priv_data;
256			int ret;
257		✗	AVIOInterruptCB interrupt_callback = {.callback = async_check_interrupt, .opaque = h};
258
259		✗	av_strstart(arg, "async:", &arg);
260		✗	atomic_init(&c->abort_request, 0);
261
262		✗	ret = ring_init(&c->ring, BUFFER_CAPACITY, READ_BACK_CAPACITY);
263		✗	if (ret < 0)
264		✗	goto fifo_fail;
265
266			/* wrap interrupt callback */
267		✗	c->interrupt_callback = h->interrupt_callback;
268		✗	ret = ffurl_open_whitelist(&c->inner, arg, flags, &interrupt_callback, options, h->protocol_whitelist, h->protocol_blacklist, h);
269		✗	if (ret != 0) {
270		✗	av_log(h, AV_LOG_ERROR, "ffurl_open failed : %s, %s\n", av_err2str(ret), arg);
271		✗	goto url_fail;
272			}
273
274		✗	c->logical_size = ffurl_size(c->inner);
275		✗	h->is_streamed = c->inner->is_streamed;
276
277		✗	ret = pthread_mutex_init(&c->mutex, NULL);
278		✗	if (ret != 0) {
279		✗	ret = AVERROR(ret);
280		✗	av_log(h, AV_LOG_ERROR, "pthread_mutex_init failed : %s\n", av_err2str(ret));
281		✗	goto mutex_fail;
282			}
283
284		✗	ret = pthread_cond_init(&c->cond_wakeup_main, NULL);
285		✗	if (ret != 0) {
286		✗	ret = AVERROR(ret);
287		✗	av_log(h, AV_LOG_ERROR, "pthread_cond_init failed : %s\n", av_err2str(ret));
288		✗	goto cond_wakeup_main_fail;
289			}
290
291		✗	ret = pthread_cond_init(&c->cond_wakeup_background, NULL);
292		✗	if (ret != 0) {
293		✗	ret = AVERROR(ret);
294		✗	av_log(h, AV_LOG_ERROR, "pthread_cond_init failed : %s\n", av_err2str(ret));
295		✗	goto cond_wakeup_background_fail;
296			}
297
298		✗	ret = pthread_create(&c->async_buffer_thread, NULL, async_buffer_task, h);
299		✗	if (ret) {
300		✗	ret = AVERROR(ret);
301		✗	av_log(h, AV_LOG_ERROR, "pthread_create failed : %s\n", av_err2str(ret));
302		✗	goto thread_fail;
303			}
304
305		✗	return 0;
306
307		✗	thread_fail:
308		✗	pthread_cond_destroy(&c->cond_wakeup_background);
309		✗	cond_wakeup_background_fail:
310		✗	pthread_cond_destroy(&c->cond_wakeup_main);
311		✗	cond_wakeup_main_fail:
312		✗	pthread_mutex_destroy(&c->mutex);
313		✗	mutex_fail:
314		✗	ffurl_closep(&c->inner);
315		✗	url_fail:
316		✗	ring_destroy(&c->ring);
317		✗	fifo_fail:
318		✗	return ret;
319			}
320
321		✗	static int async_close(URLContext *h)
322			{
323		✗	AsyncContext *c = h->priv_data;
324			int ret;
325
326		✗	pthread_mutex_lock(&c->mutex);
327		✗	atomic_store(&c->abort_request, 1);
328		✗	pthread_cond_signal(&c->cond_wakeup_background);
329		✗	pthread_mutex_unlock(&c->mutex);
330
331		✗	ret = pthread_join(c->async_buffer_thread, NULL);
332		✗	if (ret != 0)
333		✗	av_log(h, AV_LOG_ERROR, "pthread_join(): %s\n", av_err2str(ret));
334
335		✗	pthread_cond_destroy(&c->cond_wakeup_background);
336		✗	pthread_cond_destroy(&c->cond_wakeup_main);
337		✗	pthread_mutex_destroy(&c->mutex);
338		✗	ffurl_closep(&c->inner);
339		✗	ring_destroy(&c->ring);
340
341		✗	return 0;
342			}
343
344		✗	static int async_read_internal(URLContext *h, void *dest, int size)
345			{
346		✗	AsyncContext *c = h->priv_data;
347		✗	RingBuffer *ring = &c->ring;
348		✗	int read_complete = !dest;
349		✗	int to_read = size;
350		✗	int ret = 0;
351
352		✗	pthread_mutex_lock(&c->mutex);
353
354		✗	while (to_read > 0) {
355			int fifo_size, to_copy;
356		✗	if (async_check_interrupt(h)) {
357		✗	ret = AVERROR_EXIT;
358		✗	break;
359			}
360		✗	fifo_size = ring_size(ring);
361		✗	to_copy = FFMIN(to_read, fifo_size);
362		✗	if (to_copy > 0) {
363		✗	ring_read(ring, dest, to_copy);
364		✗	if (dest)
365		✗	dest = (uint8_t *)dest + to_copy;
366		✗	c->logical_pos += to_copy;
367		✗	to_read -= to_copy;
368		✗	ret = size - to_read;
369
370		✗	if (to_read <= 0 || !read_complete)
371			break;
372		✗	} else if (c->io_eof_reached) {
373		✗	if (ret <= 0) {
374		✗	if (c->io_error)
375		✗	ret = c->io_error;
376			else
377		✗	ret = AVERROR_EOF;
378			}
379		✗	break;
380			}
381		✗	pthread_cond_signal(&c->cond_wakeup_background);
382		✗	pthread_cond_wait(&c->cond_wakeup_main, &c->mutex);
383			}
384
385		✗	pthread_cond_signal(&c->cond_wakeup_background);
386		✗	pthread_mutex_unlock(&c->mutex);
387
388		✗	return ret;
389			}
390
391		✗	static int async_read(URLContext *h, unsigned char *buf, int size)
392			{
393		✗	return async_read_internal(h, buf, size);
394			}
395
396		✗	static int64_t async_seek(URLContext *h, int64_t pos, int whence)
397			{
398		✗	AsyncContext *c = h->priv_data;
399		✗	RingBuffer *ring = &c->ring;
400			int64_t ret;
401			int64_t new_logical_pos;
402			int fifo_size;
403			int fifo_size_of_read_back;
404
405		✗	if (whence == AVSEEK_SIZE) {
406		✗	av_log(h, AV_LOG_TRACE, "async_seek: AVSEEK_SIZE: %"PRId64"\n", (int64_t)c->logical_size);
407		✗	return c->logical_size;
408		✗	} else if (whence == SEEK_CUR) {
409		✗	av_log(h, AV_LOG_TRACE, "async_seek: %"PRId64"\n", pos);
410		✗	new_logical_pos = pos + c->logical_pos;
411		✗	} else if (whence == SEEK_SET){
412		✗	av_log(h, AV_LOG_TRACE, "async_seek: %"PRId64"\n", pos);
413		✗	new_logical_pos = pos;
414			} else {
415		✗	return AVERROR(EINVAL);
416			}
417		✗	if (new_logical_pos < 0)
418		✗	return AVERROR(EINVAL);
419
420		✗	fifo_size = ring_size(ring);
421		✗	fifo_size_of_read_back = ring_size_of_read_back(ring);
422		✗	if (new_logical_pos == c->logical_pos) {
423			/* current position */
424		✗	return c->logical_pos;
425		✗	} else if ((new_logical_pos >= (c->logical_pos - fifo_size_of_read_back)) &&
426		✗	(new_logical_pos < (c->logical_pos + fifo_size + SHORT_SEEK_THRESHOLD))) {
427		✗	int pos_delta = (int)(new_logical_pos - c->logical_pos);
428			/* fast seek */
429		✗	av_log(h, AV_LOG_TRACE, "async_seek: fask_seek %"PRId64" from %d dist:%d/%d\n",
430		✗	new_logical_pos, (int)c->logical_pos,
431		✗	(int)(new_logical_pos - c->logical_pos), fifo_size);
432
433		✗	if (pos_delta > 0) {
434			// fast seek forwards
435		✗	async_read_internal(h, NULL, pos_delta);
436			} else {
437			// fast seek backwards
438		✗	ring_drain(ring, pos_delta);
439		✗	c->logical_pos = new_logical_pos;
440			}
441
442		✗	return c->logical_pos;
443		✗	} else if (c->logical_size <= 0) {
444			/* can not seek */
445		✗	return AVERROR(EINVAL);
446		✗	} else if (new_logical_pos > c->logical_size) {
447			/* beyond end */
448		✗	return AVERROR(EINVAL);
449			}
450
451		✗	pthread_mutex_lock(&c->mutex);
452
453		✗	c->seek_request = 1;
454		✗	c->seek_pos = new_logical_pos;
455		✗	c->seek_whence = SEEK_SET;
456		✗	c->seek_completed = 0;
457		✗	c->seek_ret = 0;
458
459			while (1) {
460		✗	if (async_check_interrupt(h)) {
461		✗	ret = AVERROR_EXIT;
462		✗	break;
463			}
464		✗	if (c->seek_completed) {
465		✗	if (c->seek_ret >= 0)
466		✗	c->logical_pos = c->seek_ret;
467		✗	ret = c->seek_ret;
468		✗	break;
469			}
470		✗	pthread_cond_signal(&c->cond_wakeup_background);
471		✗	pthread_cond_wait(&c->cond_wakeup_main, &c->mutex);
472			}
473
474		✗	pthread_mutex_unlock(&c->mutex);
475
476		✗	return ret;
477			}
478
479			#define OFFSET(x) offsetof(AsyncContext, x)
480			#define D AV_OPT_FLAG_DECODING_PARAM
481
482			static const AVOption options[] = {
483			{NULL},
484			};
485
486			#undef D
487			#undef OFFSET
488
489			static const AVClass async_context_class = {
490			.class_name = "Async",
491			.item_name = av_default_item_name,
492			.option = options,
493			.version = LIBAVUTIL_VERSION_INT,
494			};
495
496			const URLProtocol ff_async_protocol = {
497			.name = "async",
498			.url_open2 = async_open,
499			.url_read = async_read,
500			.url_seek = async_seek,
501			.url_close = async_close,
502			.priv_data_size = sizeof(AsyncContext),
503			.priv_data_class = &async_context_class,
504			};
505
506			#if 0
507
508			#define TEST_SEEK_POS (1536)
509			#define TEST_STREAM_SIZE (2048)
510
511			typedef struct TestContext {
512			AVClass *class;
513			int64_t logical_pos;
514			int64_t logical_size;
515
516			/* options */
517			int opt_read_error;
518			} TestContext;
519
520			static int async_test_open(URLContext *h, const char *arg, int flags, AVDictionary **options)
521			{
522			TestContext *c = h->priv_data;
523			c->logical_pos = 0;
524			c->logical_size = TEST_STREAM_SIZE;
525			return 0;
526			}
527
528			static int async_test_close(URLContext *h)
529			{
530			return 0;
531			}
532
533			static int async_test_read(URLContext *h, unsigned char *buf, int size)
534			{
535			TestContext *c = h->priv_data;
536			int i;
537			int read_len = 0;
538
539			if (c->opt_read_error)
540			return c->opt_read_error;
541
542			if (c->logical_pos >= c->logical_size)
543			return AVERROR_EOF;
544
545			for (i = 0; i < size; ++i) {
546			buf[i] = c->logical_pos & 0xFF;
547
548			c->logical_pos++;
549			read_len++;
550
551			if (c->logical_pos >= c->logical_size)
552			break;
553			}
554
555			return read_len;
556			}
557
558			static int64_t async_test_seek(URLContext *h, int64_t pos, int whence)
559			{
560			TestContext *c = h->priv_data;
561			int64_t new_logical_pos;
562
563			if (whence == AVSEEK_SIZE) {
564			return c->logical_size;
565			} else if (whence == SEEK_CUR) {
566			new_logical_pos = pos + c->logical_pos;
567			} else if (whence == SEEK_SET){
568			new_logical_pos = pos;
569			} else {
570			return AVERROR(EINVAL);
571			}
572			if (new_logical_pos < 0)
573			return AVERROR(EINVAL);
574
575			c->logical_pos = new_logical_pos;
576			return new_logical_pos;
577			}
578
579			#define OFFSET(x) offsetof(TestContext, x)
580			#define D AV_OPT_FLAG_DECODING_PARAM
581
582			static const AVOption async_test_options[] = {
583			{ "async-test-read-error", "cause read fail",
584			OFFSET(opt_read_error), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, .flags = D },
585			{NULL},
586			};
587
588			#undef D
589			#undef OFFSET
590
591			static const AVClass async_test_context_class = {
592			.class_name = "Async-Test",
593			.item_name = av_default_item_name,
594			.option = async_test_options,
595			.version = LIBAVUTIL_VERSION_INT,
596			};
597
598			const URLProtocol ff_async_test_protocol = {
599			.name = "async-test",
600			.url_open2 = async_test_open,
601			.url_read = async_test_read,
602			.url_seek = async_test_seek,
603			.url_close = async_test_close,
604			.priv_data_size = sizeof(TestContext),
605			.priv_data_class = &async_test_context_class,
606			};
607
608			int main(void)
609			{
610			URLContext *h = NULL;
611			int i;
612			int ret;
613			int64_t size;
614			int64_t pos;
615			int64_t read_len;
616			unsigned char buf[4096];
617			AVDictionary *opts = NULL;
618
619			ffurl_register_protocol(&ff_async_protocol);
620			ffurl_register_protocol(&ff_async_test_protocol);
621
622			/*
623			* test normal read
624			*/
625			ret = ffurl_open_whitelist(&h, "async:async-test:", AVIO_FLAG_READ,
626			NULL, NULL, NULL, NULL, NULL);
627			printf("open: %d\n", ret);
628
629			size = ffurl_size(h);
630			printf("size: %"PRId64"\n", size);
631
632			pos = ffurl_seek(h, 0, SEEK_CUR);
633			read_len = 0;
634			while (1) {
635			ret = ffurl_read(h, buf, sizeof(buf));
636			if (ret == AVERROR_EOF) {
637			printf("read-error: AVERROR_EOF at %"PRId64"\n", ffurl_seek(h, 0, SEEK_CUR));
638			break;
639			}
640			else if (ret == 0)
641			break;
642			else if (ret < 0) {
643			printf("read-error: %d at %"PRId64"\n", ret, ffurl_seek(h, 0, SEEK_CUR));
644			goto fail;
645			} else {
646			for (i = 0; i < ret; ++i) {
647			if (buf[i] != (pos & 0xFF)) {
648			printf("read-mismatch: actual %d, expecting %d, at %"PRId64"\n",
649			(int)buf[i], (int)(pos & 0xFF), pos);
650			break;
651			}
652			pos++;
653			}
654			}
655
656			read_len += ret;
657			}
658			printf("read: %"PRId64"\n", read_len);
659
660			/*
661			* test normal seek
662			*/
663			ret = ffurl_read(h, buf, 1);
664			printf("read: %d\n", ret);
665
666			pos = ffurl_seek(h, TEST_SEEK_POS, SEEK_SET);
667			printf("seek: %"PRId64"\n", pos);
668
669			read_len = 0;
670			while (1) {
671			ret = ffurl_read(h, buf, sizeof(buf));
672			if (ret == AVERROR_EOF)
673			break;
674			else if (ret == 0)
675			break;
676			else if (ret < 0) {
677			printf("read-error: %d at %"PRId64"\n", ret, ffurl_seek(h, 0, SEEK_CUR));
678			goto fail;
679			} else {
680			for (i = 0; i < ret; ++i) {
681			if (buf[i] != (pos & 0xFF)) {
682			printf("read-mismatch: actual %d, expecting %d, at %"PRId64"\n",
683			(int)buf[i], (int)(pos & 0xFF), pos);
684			break;
685			}
686			pos++;
687			}
688			}
689
690			read_len += ret;
691			}
692			printf("read: %"PRId64"\n", read_len);
693
694			ret = ffurl_read(h, buf, 1);
695			printf("read: %d\n", ret);
696
697			/*
698			* test read error
699			*/
700			ffurl_close(h);
701			av_dict_set_int(&opts, "async-test-read-error", -10000, 0);
702			ret = ffurl_open_whitelist(&h, "async:async-test:", AVIO_FLAG_READ,
703			NULL, &opts, NULL, NULL, NULL);
704			printf("open: %d\n", ret);
705
706			ret = ffurl_read(h, buf, 1);
707			printf("read: %d\n", ret);
708
709			fail:
710			av_dict_free(&opts);
711			ffurl_close(h);
712			return 0;
713			}
714
715			#endif
716