ffmpeg / libavformat / avio.c @ 08c86634
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/*
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* Unbuffered io for ffmpeg system
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* Copyright (c) 2001 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/* needed for usleep() */
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#define _XOPEN_SOURCE 600 |
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#include <unistd.h> |
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#include "libavutil/avstring.h" |
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#include "libavutil/opt.h" |
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#include "os_support.h" |
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#include "avformat.h" |
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#if CONFIG_NETWORK
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#include "network.h" |
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#endif
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#if FF_API_URL_CLASS
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/** @name Logging context. */
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/*@{*/
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static const char *urlcontext_to_name(void *ptr) |
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{ |
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URLContext *h = (URLContext *)ptr; |
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if(h->prot) return h->prot->name; |
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else return "NULL"; |
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} |
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static const AVOption options[] = {{NULL}}; |
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static const AVClass urlcontext_class = |
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{ "URLContext", urlcontext_to_name, options, LIBAVUTIL_VERSION_INT };
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/*@}*/
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#endif
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static int default_interrupt_cb(void); |
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URLProtocol *first_protocol = NULL;
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URLInterruptCB *url_interrupt_cb = default_interrupt_cb; |
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URLProtocol *av_protocol_next(URLProtocol *p) |
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{ |
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if(p) return p->next; |
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else return first_protocol; |
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} |
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int av_register_protocol2(URLProtocol *protocol, int size) |
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{ |
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URLProtocol **p; |
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if (size < sizeof(URLProtocol)) { |
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URLProtocol* temp = av_mallocz(sizeof(URLProtocol));
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memcpy(temp, protocol, size); |
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protocol = temp; |
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} |
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p = &first_protocol; |
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while (*p != NULL) p = &(*p)->next; |
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*p = protocol; |
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protocol->next = NULL;
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return 0; |
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} |
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#if FF_API_REGISTER_PROTOCOL
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/* The layout of URLProtocol as of when major was bumped to 52 */
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struct URLProtocol_compat {
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const char *name; |
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int (*url_open)(URLContext *h, const char *filename, int flags); |
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int (*url_read)(URLContext *h, unsigned char *buf, int size); |
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int (*url_write)(URLContext *h, unsigned char *buf, int size); |
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int64_t (*url_seek)(URLContext *h, int64_t pos, int whence);
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int (*url_close)(URLContext *h);
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struct URLProtocol *next;
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}; |
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int av_register_protocol(URLProtocol *protocol)
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{ |
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return av_register_protocol2(protocol, sizeof(struct URLProtocol_compat)); |
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} |
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int register_protocol(URLProtocol *protocol)
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{ |
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return av_register_protocol2(protocol, sizeof(struct URLProtocol_compat)); |
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} |
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#endif
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static int url_alloc_for_protocol (URLContext **puc, struct URLProtocol *up, |
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const char *filename, int flags) |
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{ |
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URLContext *uc; |
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int err;
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#if CONFIG_NETWORK
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if (!ff_network_init())
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return AVERROR(EIO);
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#endif
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uc = av_mallocz(sizeof(URLContext) + strlen(filename) + 1); |
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if (!uc) {
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err = AVERROR(ENOMEM); |
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goto fail;
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} |
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#if FF_API_URL_CLASS
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uc->av_class = &urlcontext_class; |
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#endif
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uc->filename = (char *) &uc[1]; |
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strcpy(uc->filename, filename); |
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uc->prot = up; |
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uc->flags = flags; |
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uc->is_streamed = 0; /* default = not streamed */ |
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uc->max_packet_size = 0; /* default: stream file */ |
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if (up->priv_data_size) {
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uc->priv_data = av_mallocz(up->priv_data_size); |
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if (up->priv_data_class) {
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*(const AVClass**)uc->priv_data = up->priv_data_class;
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av_opt_set_defaults(uc->priv_data); |
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} |
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} |
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*puc = uc; |
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return 0; |
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fail:
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*puc = NULL;
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#if CONFIG_NETWORK
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ff_network_close(); |
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#endif
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return err;
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} |
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int url_connect(URLContext* uc)
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{ |
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int err = uc->prot->url_open(uc, uc->filename, uc->flags);
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if (err)
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return err;
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uc->is_connected = 1;
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//We must be careful here as url_seek() could be slow, for example for http
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if( (uc->flags & (URL_WRONLY | URL_RDWR))
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|| !strcmp(uc->prot->name, "file"))
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if(!uc->is_streamed && url_seek(uc, 0, SEEK_SET) < 0) |
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uc->is_streamed= 1;
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return 0; |
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} |
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int url_open_protocol (URLContext **puc, struct URLProtocol *up, |
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const char *filename, int flags) |
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{ |
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int ret;
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ret = url_alloc_for_protocol(puc, up, filename, flags); |
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if (ret)
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goto fail;
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ret = url_connect(*puc); |
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if (!ret)
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return 0; |
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fail:
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url_close(*puc); |
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*puc = NULL;
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return ret;
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} |
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#define URL_SCHEME_CHARS \
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"abcdefghijklmnopqrstuvwxyz" \
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
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"0123456789+-."
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int url_alloc(URLContext **puc, const char *filename, int flags) |
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{ |
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URLProtocol *up; |
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char proto_str[128]; |
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size_t proto_len = strspn(filename, URL_SCHEME_CHARS); |
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if (filename[proto_len] != ':' || is_dos_path(filename)) |
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strcpy(proto_str, "file");
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else
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av_strlcpy(proto_str, filename, FFMIN(proto_len+1, sizeof(proto_str))); |
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up = first_protocol; |
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while (up != NULL) { |
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if (!strcmp(proto_str, up->name))
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return url_alloc_for_protocol (puc, up, filename, flags);
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up = up->next; |
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} |
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*puc = NULL;
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return AVERROR(ENOENT);
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} |
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int url_open(URLContext **puc, const char *filename, int flags) |
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{ |
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int ret = url_alloc(puc, filename, flags);
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if (ret)
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return ret;
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ret = url_connect(*puc); |
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if (!ret)
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return 0; |
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url_close(*puc); |
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*puc = NULL;
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return ret;
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} |
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static inline int retry_transfer_wrapper(URLContext *h, unsigned char *buf, int size, int size_min, |
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int (*transfer_func)(URLContext *h, unsigned char *buf, int size)) |
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{ |
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int ret, len;
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int fast_retries = 5; |
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len = 0;
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while (len < size_min) {
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ret = transfer_func(h, buf+len, size-len); |
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if (ret == AVERROR(EINTR))
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continue;
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if (h->flags & URL_FLAG_NONBLOCK)
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return ret;
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if (ret == AVERROR(EAGAIN)) {
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ret = 0;
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if (fast_retries)
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fast_retries--; |
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else
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usleep(1000);
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} else if (ret < 1) |
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return ret < 0 ? ret : len; |
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if (ret)
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fast_retries = FFMAX(fast_retries, 2);
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len += ret; |
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} |
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return len;
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} |
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int url_read(URLContext *h, unsigned char *buf, int size) |
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{ |
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if (h->flags & URL_WRONLY)
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return AVERROR(EIO);
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return retry_transfer_wrapper(h, buf, size, 1, h->prot->url_read); |
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} |
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int url_read_complete(URLContext *h, unsigned char *buf, int size) |
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{ |
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if (h->flags & URL_WRONLY)
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return AVERROR(EIO);
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return retry_transfer_wrapper(h, buf, size, size, h->prot->url_read);
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} |
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int url_write(URLContext *h, const unsigned char *buf, int size) |
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{ |
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if (!(h->flags & (URL_WRONLY | URL_RDWR)))
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return AVERROR(EIO);
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/* avoid sending too big packets */
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if (h->max_packet_size && size > h->max_packet_size)
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return AVERROR(EIO);
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return retry_transfer_wrapper(h, buf, size, size, h->prot->url_write);
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} |
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int64_t url_seek(URLContext *h, int64_t pos, int whence)
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{ |
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int64_t ret; |
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if (!h->prot->url_seek)
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return AVERROR(ENOSYS);
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ret = h->prot->url_seek(h, pos, whence & ~AVSEEK_FORCE); |
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return ret;
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} |
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int url_close(URLContext *h)
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{ |
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int ret = 0; |
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if (!h) return 0; /* can happen when url_open fails */ |
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if (h->is_connected && h->prot->url_close)
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ret = h->prot->url_close(h); |
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#if CONFIG_NETWORK
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ff_network_close(); |
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#endif
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if (h->prot->priv_data_size)
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av_free(h->priv_data); |
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av_free(h); |
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return ret;
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} |
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int url_exist(const char *filename) |
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{ |
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URLContext *h; |
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if (url_open(&h, filename, URL_RDONLY) < 0) |
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return 0; |
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url_close(h); |
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return 1; |
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} |
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int64_t url_filesize(URLContext *h) |
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{ |
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int64_t pos, size; |
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size= url_seek(h, 0, AVSEEK_SIZE);
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if(size<0){ |
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pos = url_seek(h, 0, SEEK_CUR);
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if ((size = url_seek(h, -1, SEEK_END)) < 0) |
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return size;
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size++; |
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url_seek(h, pos, SEEK_SET); |
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} |
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return size;
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} |
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int url_get_file_handle(URLContext *h)
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{ |
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if (!h->prot->url_get_file_handle)
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return -1; |
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return h->prot->url_get_file_handle(h);
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} |
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int url_get_max_packet_size(URLContext *h)
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{ |
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return h->max_packet_size;
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} |
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void url_get_filename(URLContext *h, char *buf, int buf_size) |
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{ |
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av_strlcpy(buf, h->filename, buf_size); |
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} |
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static int default_interrupt_cb(void) |
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{ |
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return 0; |
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} |
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void url_set_interrupt_cb(URLInterruptCB *interrupt_cb)
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{ |
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if (!interrupt_cb)
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interrupt_cb = default_interrupt_cb; |
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url_interrupt_cb = interrupt_cb; |
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} |
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int av_url_read_pause(URLContext *h, int pause) |
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{ |
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if (!h->prot->url_read_pause)
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return AVERROR(ENOSYS);
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return h->prot->url_read_pause(h, pause);
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} |
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int64_t av_url_read_seek(URLContext *h, |
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int stream_index, int64_t timestamp, int flags) |
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{ |
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if (!h->prot->url_read_seek)
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return AVERROR(ENOSYS);
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return h->prot->url_read_seek(h, stream_index, timestamp, flags);
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} |