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ffmpeg/libavformat/avio.c

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/*
* unbuffered I/O
* Copyright (c) 2001 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <unistd.h>
#include "libavutil/avstring.h"
#include "libavutil/dict.h"
#include "libavutil/opt.h"
#include "os_support.h"
#include "avformat.h"
#if CONFIG_NETWORK
#include "network.h"
#endif
#include "url.h"
static URLProtocol *first_protocol = NULL;
URLProtocol *ffurl_protocol_next(URLProtocol *prev)
{
return prev ? prev->next : first_protocol;
}
/** @name Logging context. */
/*@{*/
static const char *urlcontext_to_name(void *ptr)
{
URLContext *h = (URLContext *)ptr;
if(h->prot) return h->prot->name;
else return "NULL";
}
static void *urlcontext_child_next(void *obj, void *prev)
{
URLContext *h = obj;
if (!prev && h->priv_data && h->prot->priv_data_class)
return h->priv_data;
return NULL;
}
static const AVClass *urlcontext_child_class_next(const AVClass *prev)
{
URLProtocol *p = NULL;
/* find the protocol that corresponds to prev */
while (prev && (p = ffurl_protocol_next(p)))
if (p->priv_data_class == prev)
break;
/* find next protocol with priv options */
while (p = ffurl_protocol_next(p))
if (p->priv_data_class)
return p->priv_data_class;
return NULL;
}
static const AVOption options[] = {{NULL}};
const AVClass ffurl_context_class = {
.class_name = "URLContext",
.item_name = urlcontext_to_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
.child_next = urlcontext_child_next,
.child_class_next = urlcontext_child_class_next,
};
/*@}*/
#if FF_API_OLD_INTERRUPT_CB
static int default_interrupt_cb(void);
int (*url_interrupt_cb)(void) = default_interrupt_cb;
#endif
URLProtocol *av_protocol_next(URLProtocol *p)
{
return ffurl_protocol_next(p);
}
const char *avio_enum_protocols(void **opaque, int output)
{
URLProtocol **p = opaque;
*p = ffurl_protocol_next(*p);
if (!*p) return NULL;
if ((output && (*p)->url_write) || (!output && (*p)->url_read))
return (*p)->name;
return avio_enum_protocols(opaque, output);
}
int ffurl_register_protocol(URLProtocol *protocol, int size)
{
URLProtocol **p;
if (size < sizeof(URLProtocol)) {
URLProtocol* temp = av_mallocz(sizeof(URLProtocol));
memcpy(temp, protocol, size);
protocol = temp;
}
p = &first_protocol;
while (*p != NULL) p = &(*p)->next;
*p = protocol;
protocol->next = NULL;
return 0;
}
static int url_alloc_for_protocol (URLContext **puc, struct URLProtocol *up,
const char *filename, int flags,
const AVIOInterruptCB *int_cb)
{
URLContext *uc;
int err;
#if CONFIG_NETWORK
if (up->flags & URL_PROTOCOL_FLAG_NETWORK && !ff_network_init())
return AVERROR(EIO);
#endif
uc = av_mallocz(sizeof(URLContext) + strlen(filename) + 1);
if (!uc) {
err = AVERROR(ENOMEM);
goto fail;
}
uc->av_class = &ffurl_context_class;
uc->filename = (char *) &uc[1];
strcpy(uc->filename, filename);
uc->prot = up;
uc->flags = flags;
uc->is_streamed = 0; /* default = not streamed */
uc->max_packet_size = 0; /* default: stream file */
if (up->priv_data_size) {
uc->priv_data = av_mallocz(up->priv_data_size);
if (up->priv_data_class) {
int proto_len= strlen(up->name);
char *start = strchr(uc->filename, ',');
*(const AVClass**)uc->priv_data = up->priv_data_class;
av_opt_set_defaults(uc->priv_data);
if(!strncmp(up->name, uc->filename, proto_len) && uc->filename + proto_len == start){
int ret= 0;
char *p= start;
char sep= *++p;
char *key, *val;
p++;
while(ret >= 0 && (key= strchr(p, sep)) && p<key && (val = strchr(key+1, sep))){
*val= *key= 0;
ret= av_opt_set(uc->priv_data, p, key+1, 0);
if (ret == AVERROR_OPTION_NOT_FOUND)
av_log(uc, AV_LOG_ERROR, "Key '%s' not found.\n", p);
*val= *key= sep;
p= val+1;
}
if(ret<0 || p!=key){
av_log(uc, AV_LOG_ERROR, "Error parsing options string %s\n", start);
av_freep(&uc->priv_data);
av_freep(&uc);
goto fail;
}
memmove(start, key+1, strlen(key));
}
}
}
if (int_cb)
uc->interrupt_callback = *int_cb;
*puc = uc;
return 0;
fail:
*puc = NULL;
#if CONFIG_NETWORK
if (up->flags & URL_PROTOCOL_FLAG_NETWORK)
ff_network_close();
#endif
return err;
}
int ffurl_connect(URLContext* uc, AVDictionary **options)
{
int err =
#if !FF_API_OLD_AVIO
uc->prot->url_open2 ? uc->prot->url_open2(uc, uc->filename, uc->flags, options) :
#endif
uc->prot->url_open(uc, uc->filename, uc->flags);
if (err)
return err;
uc->is_connected = 1;
//We must be careful here as ffurl_seek() could be slow, for example for http
if( (uc->flags & AVIO_FLAG_WRITE)
|| !strcmp(uc->prot->name, "file"))
if(!uc->is_streamed && ffurl_seek(uc, 0, SEEK_SET) < 0)
uc->is_streamed= 1;
return 0;
}
#if FF_API_OLD_AVIO
int url_open_protocol (URLContext **puc, struct URLProtocol *up,
const char *filename, int flags)
{
int ret;
ret = url_alloc_for_protocol(puc, up, filename, flags, NULL);
if (ret)
goto fail;
ret = ffurl_connect(*puc, NULL);
if (!ret)
return 0;
fail:
ffurl_close(*puc);
*puc = NULL;
return ret;
}
int url_alloc(URLContext **puc, const char *filename, int flags)
{
return ffurl_alloc(puc, filename, flags, NULL);
}
int url_connect(URLContext* uc)
{
return ffurl_connect(uc, NULL);
}
int url_open(URLContext **puc, const char *filename, int flags)
{
return ffurl_open(puc, filename, flags, NULL, NULL);
}
int url_read(URLContext *h, unsigned char *buf, int size)
{
return ffurl_read(h, buf, size);
}
int url_read_complete(URLContext *h, unsigned char *buf, int size)
{
return ffurl_read_complete(h, buf, size);
}
int url_write(URLContext *h, const unsigned char *buf, int size)
{
return ffurl_write(h, buf, size);
}
int64_t url_seek(URLContext *h, int64_t pos, int whence)
{
return ffurl_seek(h, pos, whence);
}
int url_close(URLContext *h)
{
return ffurl_close(h);
}
int64_t url_filesize(URLContext *h)
{
return ffurl_size(h);
}
int url_get_file_handle(URLContext *h)
{
return ffurl_get_file_handle(h);
}
int url_get_max_packet_size(URLContext *h)
{
return h->max_packet_size;
}
void url_get_filename(URLContext *h, char *buf, int buf_size)
{
av_strlcpy(buf, h->filename, buf_size);
}
void url_set_interrupt_cb(URLInterruptCB *interrupt_cb)
{
avio_set_interrupt_cb(interrupt_cb);
}
int av_register_protocol2(URLProtocol *protocol, int size)
{
return ffurl_register_protocol(protocol, size);
}
#endif
#define URL_SCHEME_CHARS \
"abcdefghijklmnopqrstuvwxyz" \
"ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
"0123456789+-."
int ffurl_alloc(URLContext **puc, const char *filename, int flags,
const AVIOInterruptCB *int_cb)
{
URLProtocol *up = NULL;
char proto_str[128], proto_nested[128], *ptr;
size_t proto_len = strspn(filename, URL_SCHEME_CHARS);
if (!first_protocol) {
av_log(NULL, AV_LOG_WARNING, "No URL Protocols are registered. "
"Missing call to av_register_all()?\n");
}
if (filename[proto_len] != ':' && filename[proto_len] != ',' || is_dos_path(filename))
strcpy(proto_str, "file");
else
av_strlcpy(proto_str, filename, FFMIN(proto_len+1, sizeof(proto_str)));
if ((ptr = strchr(proto_str, ',')))
*ptr = '\0';
av_strlcpy(proto_nested, proto_str, sizeof(proto_nested));
if ((ptr = strchr(proto_nested, '+')))
*ptr = '\0';
while (up = ffurl_protocol_next(up)) {
if (!strcmp(proto_str, up->name))
return url_alloc_for_protocol (puc, up, filename, flags, int_cb);
if (up->flags & URL_PROTOCOL_FLAG_NESTED_SCHEME &&
!strcmp(proto_nested, up->name))
return url_alloc_for_protocol (puc, up, filename, flags, int_cb);
}
*puc = NULL;
return AVERROR(ENOENT);
}
int ffurl_open(URLContext **puc, const char *filename, int flags,
const AVIOInterruptCB *int_cb, AVDictionary **options)
{
int ret = ffurl_alloc(puc, filename, flags, int_cb);
if (ret)
return ret;
if (options && (*puc)->prot->priv_data_class &&
(ret = av_opt_set_dict((*puc)->priv_data, options)) < 0)
goto fail;
ret = ffurl_connect(*puc, options);
if (!ret)
return 0;
fail:
ffurl_close(*puc);
*puc = NULL;
return ret;
}
static inline int retry_transfer_wrapper(URLContext *h, unsigned char *buf, int size, int size_min,
int (*transfer_func)(URLContext *h, unsigned char *buf, int size))
{
int ret, len;
int fast_retries = 5;
len = 0;
while (len < size_min) {
ret = transfer_func(h, buf+len, size-len);
if (ret == AVERROR(EINTR))
continue;
if (h->flags & AVIO_FLAG_NONBLOCK)
return ret;
if (ret == AVERROR(EAGAIN)) {
ret = 0;
if (fast_retries)
fast_retries--;
else
usleep(1000);
} else if (ret < 1)
return ret < 0 ? ret : len;
if (ret)
fast_retries = FFMAX(fast_retries, 2);
len += ret;
if (len < size && ff_check_interrupt(&h->interrupt_callback))
return AVERROR_EXIT;
}
return len;
}
int ffurl_read(URLContext *h, unsigned char *buf, int size)
{
if (!(h->flags & AVIO_FLAG_READ))
return AVERROR(EIO);
return retry_transfer_wrapper(h, buf, size, 1, h->prot->url_read);
}
int ffurl_read_complete(URLContext *h, unsigned char *buf, int size)
{
if (!(h->flags & AVIO_FLAG_READ))
return AVERROR(EIO);
return retry_transfer_wrapper(h, buf, size, size, h->prot->url_read);
}
int ffurl_write(URLContext *h, const unsigned char *buf, int size)
{
if (!(h->flags & AVIO_FLAG_WRITE))
return AVERROR(EIO);
/* avoid sending too big packets */
if (h->max_packet_size && size > h->max_packet_size)
return AVERROR(EIO);
return retry_transfer_wrapper(h, buf, size, size, (void*)h->prot->url_write);
}
int64_t ffurl_seek(URLContext *h, int64_t pos, int whence)
{
int64_t ret;
if (!h->prot->url_seek)
return AVERROR(ENOSYS);
ret = h->prot->url_seek(h, pos, whence & ~AVSEEK_FORCE);
return ret;
}
int ffurl_close(URLContext *h)
{
int ret = 0;
if (!h) return 0; /* can happen when ffurl_open fails */
if (h->is_connected && h->prot->url_close)
ret = h->prot->url_close(h);
#if CONFIG_NETWORK
if (h->prot->flags & URL_PROTOCOL_FLAG_NETWORK)
ff_network_close();
#endif
if (h->prot->priv_data_size) {
if (h->prot->priv_data_class)
av_opt_free(h->priv_data);
av_free(h->priv_data);
}
av_free(h);
return ret;
}
#if FF_API_OLD_AVIO
int url_exist(const char *filename)
{
URLContext *h;
if (ffurl_open(&h, filename, AVIO_FLAG_READ, NULL, NULL) < 0)
return 0;
ffurl_close(h);
return 1;
}
#endif
int avio_check(const char *url, int flags)
{
URLContext *h;
int ret = ffurl_alloc(&h, url, flags, NULL);
if (ret)
return ret;
if (h->prot->url_check) {
ret = h->prot->url_check(h, flags);
} else {
ret = ffurl_connect(h, NULL);
if (ret >= 0)
ret = flags;
}
ffurl_close(h);
return ret;
}
int64_t ffurl_size(URLContext *h)
{
int64_t pos, size;
size= ffurl_seek(h, 0, AVSEEK_SIZE);
if(size<0){
pos = ffurl_seek(h, 0, SEEK_CUR);
if ((size = ffurl_seek(h, -1, SEEK_END)) < 0)
return size;
size++;
ffurl_seek(h, pos, SEEK_SET);
}
return size;
}
int ffurl_get_file_handle(URLContext *h)
{
if (!h->prot->url_get_file_handle)
return -1;
return h->prot->url_get_file_handle(h);
}
#if FF_API_OLD_INTERRUPT_CB
static int default_interrupt_cb(void)
{
return 0;
}
void avio_set_interrupt_cb(int (*interrupt_cb)(void))
{
if (!interrupt_cb)
interrupt_cb = default_interrupt_cb;
url_interrupt_cb = interrupt_cb;
}
#endif
int ff_check_interrupt(AVIOInterruptCB *cb)
{
int ret;
if (cb && cb->callback && (ret = cb->callback(cb->opaque)))
return ret;
#if FF_API_OLD_INTERRUPT_CB
return url_interrupt_cb();
#else
return 0;
#endif
}
#if FF_API_OLD_AVIO
int av_url_read_pause(URLContext *h, int pause)
{
if (!h->prot->url_read_pause)
return AVERROR(ENOSYS);
return h->prot->url_read_pause(h, pause);
}
int64_t av_url_read_seek(URLContext *h,
int stream_index, int64_t timestamp, int flags)
{
if (!h->prot->url_read_seek)
return AVERROR(ENOSYS);
return h->prot->url_read_seek(h, stream_index, timestamp, flags);
}
#endif
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