mirror of https://git.ffmpeg.org/ffmpeg.git
393 lines
11 KiB
C
393 lines
11 KiB
C
/*
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* unbuffered I/O
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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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#include <unistd.h>
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#include "libavutil/avstring.h"
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#include "libavutil/dict.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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#include "url.h"
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static URLProtocol *first_protocol = NULL;
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URLProtocol *ffurl_protocol_next(URLProtocol *prev)
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{
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return prev ? prev->next : first_protocol;
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}
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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 void *urlcontext_child_next(void *obj, void *prev)
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{
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URLContext *h = obj;
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if (!prev && h->priv_data && h->prot->priv_data_class)
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return h->priv_data;
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return NULL;
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}
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static const AVClass *urlcontext_child_class_next(const AVClass *prev)
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{
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URLProtocol *p = NULL;
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/* find the protocol that corresponds to prev */
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while (prev && (p = ffurl_protocol_next(p)))
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if (p->priv_data_class == prev)
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break;
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/* find next protocol with priv options */
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while (p = ffurl_protocol_next(p))
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if (p->priv_data_class)
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return p->priv_data_class;
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return NULL;
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}
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static const AVOption options[] = {{NULL}};
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const AVClass ffurl_context_class = {
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.class_name = "URLContext",
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.item_name = urlcontext_to_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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.child_next = urlcontext_child_next,
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.child_class_next = urlcontext_child_class_next,
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};
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/*@}*/
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const char *avio_enum_protocols(void **opaque, int output)
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{
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URLProtocol **p = (URLProtocol **)opaque;
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*p = ffurl_protocol_next(*p);
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if (!*p) return NULL;
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if ((output && (*p)->url_write) || (!output && (*p)->url_read))
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return (*p)->name;
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return avio_enum_protocols(opaque, output);
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}
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int ffurl_register_protocol(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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static int url_alloc_for_protocol (URLContext **puc, struct URLProtocol *up,
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const char *filename, int flags,
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const AVIOInterruptCB *int_cb)
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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 (up->flags & URL_PROTOCOL_FLAG_NETWORK && !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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uc->av_class = &ffurl_context_class;
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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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int proto_len= strlen(up->name);
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char *start = strchr(uc->filename, ',');
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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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if(!strncmp(up->name, uc->filename, proto_len) && uc->filename + proto_len == start){
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int ret= 0;
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char *p= start;
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char sep= *++p;
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char *key, *val;
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p++;
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while(ret >= 0 && (key= strchr(p, sep)) && p<key && (val = strchr(key+1, sep))){
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*val= *key= 0;
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ret= av_opt_set(uc->priv_data, p, key+1, 0);
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if (ret == AVERROR_OPTION_NOT_FOUND)
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av_log(uc, AV_LOG_ERROR, "Key '%s' not found.\n", p);
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*val= *key= sep;
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p= val+1;
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}
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if(ret<0 || p!=key){
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av_log(uc, AV_LOG_ERROR, "Error parsing options string %s\n", start);
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av_freep(&uc->priv_data);
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av_freep(&uc);
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goto fail;
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}
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memmove(start, key+1, strlen(key));
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}
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}
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}
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if (int_cb)
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uc->interrupt_callback = *int_cb;
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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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if (up->flags & URL_PROTOCOL_FLAG_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 ffurl_connect(URLContext* uc, AVDictionary **options)
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{
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int err =
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uc->prot->url_open2 ? uc->prot->url_open2(uc, uc->filename, uc->flags, options) :
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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 ffurl_seek() could be slow, for example for http
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if( (uc->flags & AVIO_FLAG_WRITE)
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|| !strcmp(uc->prot->name, "file"))
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if(!uc->is_streamed && ffurl_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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#define URL_SCHEME_CHARS \
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"abcdefghijklmnopqrstuvwxyz" \
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
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"0123456789+-."
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int ffurl_alloc(URLContext **puc, const char *filename, int flags,
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const AVIOInterruptCB *int_cb)
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{
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URLProtocol *up = NULL;
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char proto_str[128], proto_nested[128], *ptr;
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size_t proto_len = strspn(filename, URL_SCHEME_CHARS);
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if (!first_protocol) {
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av_log(NULL, AV_LOG_WARNING, "No URL Protocols are registered. "
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"Missing call to av_register_all()?\n");
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}
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if (filename[proto_len] != ':' && 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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if ((ptr = strchr(proto_str, ',')))
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*ptr = '\0';
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av_strlcpy(proto_nested, proto_str, sizeof(proto_nested));
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if ((ptr = strchr(proto_nested, '+')))
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*ptr = '\0';
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while (up = ffurl_protocol_next(up)) {
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if (!strcmp(proto_str, up->name))
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return url_alloc_for_protocol (puc, up, filename, flags, int_cb);
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if (up->flags & URL_PROTOCOL_FLAG_NESTED_SCHEME &&
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!strcmp(proto_nested, up->name))
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return url_alloc_for_protocol (puc, up, filename, flags, int_cb);
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}
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*puc = NULL;
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return AVERROR_PROTOCOL_NOT_FOUND;
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}
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int ffurl_open(URLContext **puc, const char *filename, int flags,
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const AVIOInterruptCB *int_cb, AVDictionary **options)
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{
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int ret = ffurl_alloc(puc, filename, flags, int_cb);
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if (ret)
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return ret;
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if (options && (*puc)->prot->priv_data_class &&
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(ret = av_opt_set_dict((*puc)->priv_data, options)) < 0)
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goto fail;
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ret = ffurl_connect(*puc, options);
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if (!ret)
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return 0;
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fail:
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ffurl_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 & AVIO_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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if (len < size && ff_check_interrupt(&h->interrupt_callback))
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return AVERROR_EXIT;
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}
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return len;
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}
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int ffurl_read(URLContext *h, unsigned char *buf, int size)
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{
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if (!(h->flags & AVIO_FLAG_READ))
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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 ffurl_read_complete(URLContext *h, unsigned char *buf, int size)
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{
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if (!(h->flags & AVIO_FLAG_READ))
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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 ffurl_write(URLContext *h, const unsigned char *buf, int size)
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{
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if (!(h->flags & AVIO_FLAG_WRITE))
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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, (unsigned char *)buf, size, size, (void*)h->prot->url_write);
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}
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int64_t ffurl_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 ffurl_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 ffurl_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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if (h->prot->flags & URL_PROTOCOL_FLAG_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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if (h->prot->priv_data_class)
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av_opt_free(h->priv_data);
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av_free(h->priv_data);
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}
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av_free(h);
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return ret;
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}
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int avio_check(const char *url, int flags)
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{
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URLContext *h;
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int ret = ffurl_alloc(&h, url, flags, NULL);
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if (ret)
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return ret;
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if (h->prot->url_check) {
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ret = h->prot->url_check(h, flags);
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} else {
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ret = ffurl_connect(h, NULL);
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if (ret >= 0)
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ret = flags;
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}
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ffurl_close(h);
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return ret;
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}
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int64_t ffurl_size(URLContext *h)
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{
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int64_t pos, size;
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size= ffurl_seek(h, 0, AVSEEK_SIZE);
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if(size<0){
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pos = ffurl_seek(h, 0, SEEK_CUR);
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if ((size = ffurl_seek(h, -1, SEEK_END)) < 0)
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return size;
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size++;
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ffurl_seek(h, pos, SEEK_SET);
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}
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return size;
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}
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int ffurl_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 ffurl_shutdown(URLContext *h, int flags)
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{
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if (!h->prot->url_shutdown)
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return AVERROR(EINVAL);
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return h->prot->url_shutdown(h, flags);
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}
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int ff_check_interrupt(AVIOInterruptCB *cb)
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{
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int ret;
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if (cb && cb->callback && (ret = cb->callback(cb->opaque)))
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return ret;
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return 0;
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}
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