mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
669 lines
20 KiB
C
669 lines
20 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 "libavutil/avstring.h"
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#include "libavutil/dict.h"
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#include "libavutil/opt.h"
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#include "libavutil/time.h"
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#include "libavutil/avassert.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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/** @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)
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return h->prot->name;
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else
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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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#define OFFSET(x) offsetof(URLContext,x)
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#define E AV_OPT_FLAG_ENCODING_PARAM
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#define D AV_OPT_FLAG_DECODING_PARAM
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static const AVOption options[] = {
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{"protocol_whitelist", "List of protocols that are allowed to be used", OFFSET(protocol_whitelist), AV_OPT_TYPE_STRING, { .str = NULL }, CHAR_MIN, CHAR_MAX, D },
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{"protocol_blacklist", "List of protocols that are not allowed to be used", OFFSET(protocol_blacklist), AV_OPT_TYPE_STRING, { .str = NULL }, CHAR_MIN, CHAR_MAX, D },
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{"rw_timeout", "Timeout for IO operations (in microseconds)", offsetof(URLContext, rw_timeout), AV_OPT_TYPE_INT64, { .i64 = 0 }, 0, INT64_MAX, AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_DECODING_PARAM },
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{ NULL }
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};
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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 = ff_urlcontext_child_class_next,
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};
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/*@}*/
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static int url_alloc_for_protocol(URLContext **puc, const 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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if ((flags & AVIO_FLAG_READ) && !up->url_read) {
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av_log(NULL, AV_LOG_ERROR,
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"Impossible to open the '%s' protocol for reading\n", up->name);
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return AVERROR(EIO);
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}
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if ((flags & AVIO_FLAG_WRITE) && !up->url_write) {
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av_log(NULL, AV_LOG_ERROR,
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"Impossible to open the '%s' protocol for writing\n", up->name);
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return AVERROR(EIO);
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}
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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 (!uc->priv_data) {
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err = AVERROR(ENOMEM);
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goto fail;
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}
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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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if (strcmp(up->name, "subfile"))
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ret = AVERROR(EINVAL);
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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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if (strcmp(p, "start") && strcmp(p, "end")) {
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ret = AVERROR_OPTION_NOT_FOUND;
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} else
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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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err = AVERROR(EINVAL);
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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 (uc)
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av_freep(&uc->priv_data);
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av_freep(&uc);
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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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AVDictionary *tmp_opts = NULL;
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AVDictionaryEntry *e;
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if (!options)
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options = &tmp_opts;
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// Check that URLContext was initialized correctly and lists are matching if set
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av_assert0(!(e=av_dict_get(*options, "protocol_whitelist", NULL, 0)) ||
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(uc->protocol_whitelist && !strcmp(uc->protocol_whitelist, e->value)));
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av_assert0(!(e=av_dict_get(*options, "protocol_blacklist", NULL, 0)) ||
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(uc->protocol_blacklist && !strcmp(uc->protocol_blacklist, e->value)));
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if (uc->protocol_whitelist && av_match_list(uc->prot->name, uc->protocol_whitelist, ',') <= 0) {
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av_log(uc, AV_LOG_ERROR, "Protocol '%s' not on whitelist '%s'!\n", uc->prot->name, uc->protocol_whitelist);
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return AVERROR(EINVAL);
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}
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if (uc->protocol_blacklist && av_match_list(uc->prot->name, uc->protocol_blacklist, ',') > 0) {
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av_log(uc, AV_LOG_ERROR, "Protocol '%s' on blacklist '%s'!\n", uc->prot->name, uc->protocol_blacklist);
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return AVERROR(EINVAL);
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}
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if (!uc->protocol_whitelist && uc->prot->default_whitelist) {
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av_log(uc, AV_LOG_DEBUG, "Setting default whitelist '%s'\n", uc->prot->default_whitelist);
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uc->protocol_whitelist = av_strdup(uc->prot->default_whitelist);
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if (!uc->protocol_whitelist) {
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return AVERROR(ENOMEM);
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}
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} else if (!uc->protocol_whitelist)
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av_log(uc, AV_LOG_DEBUG, "No default whitelist set\n"); // This should be an error once all declare a default whitelist
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if ((err = av_dict_set(options, "protocol_whitelist", uc->protocol_whitelist, 0)) < 0)
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return err;
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if ((err = av_dict_set(options, "protocol_blacklist", uc->protocol_blacklist, 0)) < 0)
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return err;
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err =
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uc->prot->url_open2 ? uc->prot->url_open2(uc,
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uc->filename,
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uc->flags,
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options) :
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uc->prot->url_open(uc, uc->filename, uc->flags);
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av_dict_set(options, "protocol_whitelist", NULL, 0);
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av_dict_set(options, "protocol_blacklist", NULL, 0);
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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,
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* for example for http */
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if ((uc->flags & AVIO_FLAG_WRITE) || !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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int ffurl_accept(URLContext *s, URLContext **c)
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{
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av_assert0(!*c);
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if (s->prot->url_accept)
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return s->prot->url_accept(s, c);
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return AVERROR(EBADF);
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}
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int ffurl_handshake(URLContext *c)
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{
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int ret;
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if (c->prot->url_handshake) {
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ret = c->prot->url_handshake(c);
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if (ret)
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return ret;
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}
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c->is_connected = 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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static const struct URLProtocol *url_find_protocol(const char *filename)
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{
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const URLProtocol **protocols;
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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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int i;
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if (filename[proto_len] != ':' &&
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(strncmp(filename, "subfile,", 8) || !strchr(filename + proto_len + 1, ':')) ||
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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,
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FFMIN(proto_len + 1, sizeof(proto_str)));
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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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protocols = ffurl_get_protocols(NULL, NULL);
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if (!protocols)
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return NULL;
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for (i = 0; protocols[i]; i++) {
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const URLProtocol *up = protocols[i];
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if (!strcmp(proto_str, up->name)) {
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av_freep(&protocols);
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return up;
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}
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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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av_freep(&protocols);
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return up;
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}
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}
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av_freep(&protocols);
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if (av_strstart(filename, "https:", NULL) || av_strstart(filename, "tls:", NULL))
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av_log(NULL, AV_LOG_WARNING, "https protocol not found, recompile FFmpeg with "
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"openssl, gnutls or securetransport enabled.\n");
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return NULL;
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}
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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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const URLProtocol *p = NULL;
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p = url_find_protocol(filename);
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if (p)
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return url_alloc_for_protocol(puc, p, filename, flags, int_cb);
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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_whitelist(URLContext **puc, const char *filename, int flags,
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const AVIOInterruptCB *int_cb, AVDictionary **options,
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const char *whitelist, const char* blacklist,
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URLContext *parent)
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{
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AVDictionary *tmp_opts = NULL;
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AVDictionaryEntry *e;
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int ret = ffurl_alloc(puc, filename, flags, int_cb);
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if (ret < 0)
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return ret;
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if (parent)
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av_opt_copy(*puc, parent);
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if (options &&
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(ret = av_opt_set_dict(*puc, options)) < 0)
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goto fail;
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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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if (!options)
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options = &tmp_opts;
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av_assert0(!whitelist ||
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!(e=av_dict_get(*options, "protocol_whitelist", NULL, 0)) ||
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!strcmp(whitelist, e->value));
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av_assert0(!blacklist ||
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!(e=av_dict_get(*options, "protocol_blacklist", NULL, 0)) ||
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!strcmp(blacklist, e->value));
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if ((ret = av_dict_set(options, "protocol_whitelist", whitelist, 0)) < 0)
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goto fail;
|
|
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if ((ret = av_dict_set(options, "protocol_blacklist", blacklist, 0)) < 0)
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goto fail;
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|
|
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if ((ret = av_opt_set_dict(*puc, options)) < 0)
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goto fail;
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|
|
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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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|
|
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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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return ffurl_open_whitelist(puc, filename, flags,
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int_cb, options, NULL, NULL, NULL);
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}
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|
|
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static inline int retry_transfer_wrapper(URLContext *h, uint8_t *buf,
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int size, int size_min,
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int (*transfer_func)(URLContext *h,
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uint8_t *buf,
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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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int64_t wait_since = 0;
|
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|
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len = 0;
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while (len < size_min) {
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if (ff_check_interrupt(&h->interrupt_callback))
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return AVERROR_EXIT;
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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;
|
|
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 {
|
|
if (h->rw_timeout) {
|
|
if (!wait_since)
|
|
wait_since = av_gettime_relative();
|
|
else if (av_gettime_relative() > wait_since + h->rw_timeout)
|
|
return AVERROR(EIO);
|
|
}
|
|
av_usleep(1000);
|
|
}
|
|
} else if (ret == AVERROR_EOF)
|
|
return (len > 0) ? len : AVERROR_EOF;
|
|
else if (ret < 0)
|
|
return ret;
|
|
if (ret) {
|
|
fast_retries = FFMAX(fast_retries, 2);
|
|
wait_since = 0;
|
|
}
|
|
len += ret;
|
|
}
|
|
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, (unsigned char *)buf, size, size,
|
|
(int (*)(struct URLContext *, uint8_t *, int))
|
|
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_closep(URLContext **hh)
|
|
{
|
|
URLContext *h= *hh;
|
|
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_freep(&h->priv_data);
|
|
}
|
|
av_opt_free(h);
|
|
av_freep(hh);
|
|
return ret;
|
|
}
|
|
|
|
int ffurl_close(URLContext *h)
|
|
{
|
|
return ffurl_closep(&h);
|
|
}
|
|
|
|
|
|
const char *avio_find_protocol_name(const char *url)
|
|
{
|
|
const URLProtocol *p = url_find_protocol(url);
|
|
|
|
return p ? p->name : NULL;
|
|
}
|
|
|
|
int avio_check(const char *url, int flags)
|
|
{
|
|
URLContext *h;
|
|
int ret = ffurl_alloc(&h, url, flags, NULL);
|
|
if (ret < 0)
|
|
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;
|
|
}
|
|
|
|
int avpriv_io_move(const char *url_src, const char *url_dst)
|
|
{
|
|
URLContext *h_src, *h_dst;
|
|
int ret = ffurl_alloc(&h_src, url_src, AVIO_FLAG_READ_WRITE, NULL);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = ffurl_alloc(&h_dst, url_dst, AVIO_FLAG_WRITE, NULL);
|
|
if (ret < 0) {
|
|
ffurl_close(h_src);
|
|
return ret;
|
|
}
|
|
|
|
if (h_src->prot == h_dst->prot && h_src->prot->url_move)
|
|
ret = h_src->prot->url_move(h_src, h_dst);
|
|
else
|
|
ret = AVERROR(ENOSYS);
|
|
|
|
ffurl_close(h_src);
|
|
ffurl_close(h_dst);
|
|
return ret;
|
|
}
|
|
|
|
int avpriv_io_delete(const char *url)
|
|
{
|
|
URLContext *h;
|
|
int ret = ffurl_alloc(&h, url, AVIO_FLAG_WRITE, NULL);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (h->prot->url_delete)
|
|
ret = h->prot->url_delete(h);
|
|
else
|
|
ret = AVERROR(ENOSYS);
|
|
|
|
ffurl_close(h);
|
|
return ret;
|
|
}
|
|
|
|
int avio_open_dir(AVIODirContext **s, const char *url, AVDictionary **options)
|
|
{
|
|
URLContext *h = NULL;
|
|
AVIODirContext *ctx = NULL;
|
|
int ret;
|
|
av_assert0(s);
|
|
|
|
ctx = av_mallocz(sizeof(*ctx));
|
|
if (!ctx) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto fail;
|
|
}
|
|
|
|
if ((ret = ffurl_alloc(&h, url, AVIO_FLAG_READ, NULL)) < 0)
|
|
goto fail;
|
|
|
|
if (h->prot->url_open_dir && h->prot->url_read_dir && h->prot->url_close_dir) {
|
|
if (options && h->prot->priv_data_class &&
|
|
(ret = av_opt_set_dict(h->priv_data, options)) < 0)
|
|
goto fail;
|
|
ret = h->prot->url_open_dir(h);
|
|
} else
|
|
ret = AVERROR(ENOSYS);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
h->is_connected = 1;
|
|
ctx->url_context = h;
|
|
*s = ctx;
|
|
return 0;
|
|
|
|
fail:
|
|
av_free(ctx);
|
|
*s = NULL;
|
|
ffurl_close(h);
|
|
return ret;
|
|
}
|
|
|
|
int avio_read_dir(AVIODirContext *s, AVIODirEntry **next)
|
|
{
|
|
URLContext *h;
|
|
int ret;
|
|
|
|
if (!s || !s->url_context)
|
|
return AVERROR(EINVAL);
|
|
h = s->url_context;
|
|
if ((ret = h->prot->url_read_dir(h, next)) < 0)
|
|
avio_free_directory_entry(next);
|
|
return ret;
|
|
}
|
|
|
|
int avio_close_dir(AVIODirContext **s)
|
|
{
|
|
URLContext *h;
|
|
|
|
av_assert0(s);
|
|
if (!(*s) || !(*s)->url_context)
|
|
return AVERROR(EINVAL);
|
|
h = (*s)->url_context;
|
|
h->prot->url_close_dir(h);
|
|
ffurl_close(h);
|
|
av_freep(s);
|
|
*s = NULL;
|
|
return 0;
|
|
}
|
|
|
|
void avio_free_directory_entry(AVIODirEntry **entry)
|
|
{
|
|
if (!entry || !*entry)
|
|
return;
|
|
av_free((*entry)->name);
|
|
av_freep(entry);
|
|
}
|
|
|
|
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 || !h->prot || !h->prot->url_get_file_handle)
|
|
return -1;
|
|
return h->prot->url_get_file_handle(h);
|
|
}
|
|
|
|
int ffurl_get_multi_file_handle(URLContext *h, int **handles, int *numhandles)
|
|
{
|
|
if (!h || !h->prot)
|
|
return AVERROR(ENOSYS);
|
|
if (!h->prot->url_get_multi_file_handle) {
|
|
if (!h->prot->url_get_file_handle)
|
|
return AVERROR(ENOSYS);
|
|
*handles = av_malloc(sizeof(**handles));
|
|
if (!*handles)
|
|
return AVERROR(ENOMEM);
|
|
*numhandles = 1;
|
|
*handles[0] = h->prot->url_get_file_handle(h);
|
|
return 0;
|
|
}
|
|
return h->prot->url_get_multi_file_handle(h, handles, numhandles);
|
|
}
|
|
|
|
int ffurl_get_short_seek(URLContext *h)
|
|
{
|
|
if (!h || !h->prot || !h->prot->url_get_short_seek)
|
|
return AVERROR(ENOSYS);
|
|
return h->prot->url_get_short_seek(h);
|
|
}
|
|
|
|
int ffurl_shutdown(URLContext *h, int flags)
|
|
{
|
|
if (!h || !h->prot || !h->prot->url_shutdown)
|
|
return AVERROR(ENOSYS);
|
|
return h->prot->url_shutdown(h, flags);
|
|
}
|
|
|
|
int ff_check_interrupt(AVIOInterruptCB *cb)
|
|
{
|
|
if (cb && cb->callback)
|
|
return cb->callback(cb->opaque);
|
|
return 0;
|
|
}
|