X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Favio.c;h=ba25abea38f16516b78b868295700c4a74a0a38b;hb=100c3fb2d1d7451857fd143c98b329e271dbdf50;hp=4f96b654a480a6bd5b101b801bb7fd86f673c624;hpb=5509bffa88238d1f445a84a32e3791bfb9e532fd;p=ffmpeg

diff --git a/libavformat/avio.c b/libavformat/avio.c
index 4f96b654a48..ba25abea38f 100644
--- a/libavformat/avio.c
+++ b/libavformat/avio.c
@@ -1,31 +1,107 @@
 /*
- * Unbuffered io for ffmpeg system
+ * unbuffered I/O
  * Copyright (c) 2001 Fabrice Bellard
  *
- * This library is free software; you can redistribute it and/or
+ * This file is part of Libav.
+ *
+ * Libav 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
  *
- * This library is distributed in the hope that it will be useful,
+ * Libav 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 this library; if not, write to the Free Software
+ * License along with Libav; 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;
 
-static int default_interrupt_cb(void);
+    /* find next protocol with priv options */
+    while (p = ffurl_protocol_next(p))
+        if (p->priv_data_class)
+            return p->priv_data_class;
+    return NULL;
 
-URLProtocol *first_protocol = NULL;
-URLInterruptCB *url_interrupt_cb = default_interrupt_cb;
+}
+
+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,
+};
+/*@}*/
+
+
+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 register_protocol(URLProtocol *protocol)
+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;
@@ -33,158 +109,246 @@ int register_protocol(URLProtocol *protocol)
     return 0;
 }
 
-int url_open(URLContext **puc, const char *filename, int flags)
+static int url_alloc_for_protocol (URLContext **puc, struct URLProtocol *up,
+                                   const char *filename, int flags,
+                                   const AVIOInterruptCB *int_cb)
 {
     URLContext *uc;
-    URLProtocol *up;
-    const char *p;
-    char proto_str[128], *q;
     int err;
 
-    p = filename;
-    q = proto_str;
-    while (*p != '\0' && *p != ':') {
-        /* protocols can only contain alphabetic chars */
-        if (!isalpha(*p))
-            goto file_proto;
-        if ((q - proto_str) < sizeof(proto_str) - 1)
-            *q++ = *p;
-        p++;
-    }
-    /* if the protocol has length 1, we consider it is a dos drive */
-    if (*p == '\0' || (q - proto_str) <= 1) {
-    file_proto:
-        strcpy(proto_str, "file");
-    } else {
-        *q = '\0';
-    }
-
-    up = first_protocol;
-    while (up != NULL) {
-        if (!strcmp(proto_str, up->name))
-            goto found;
-        up = up->next;
-    }
-    err = -ENOENT;
-    goto fail;
- found:
-    uc = av_malloc(sizeof(URLContext) + strlen(filename));
+#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 = -ENOMEM;
+        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 */
-    err = up->url_open(uc, filename, flags);
-    if (err < 0) {
-        av_free(uc);
-        *puc = NULL;
-        return err;
+    if (up->priv_data_size) {
+        uc->priv_data = av_mallocz(up->priv_data_size);
+        if (up->priv_data_class) {
+            *(const AVClass**)uc->priv_data = up->priv_data_class;
+            av_opt_set_defaults(uc->priv_data);
+        }
     }
+    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 url_read(URLContext *h, unsigned char *buf, int size)
+int ffurl_connect(URLContext* uc, AVDictionary **options)
 {
-    int ret;
-    if (h->flags & URL_WRONLY)
-        return AVERROR_IO;
-    ret = h->prot->url_read(h, buf, size);
+    int err =
+        uc->prot->url_open2 ? uc->prot->url_open2(uc, uc->filename, uc->flags, options) :
+        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;
+}
+
+#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 (filename[proto_len] != ':' || is_dos_path(filename))
+        strcpy(proto_str, "file");
+    else
+        av_strlcpy(proto_str, filename, FFMIN(proto_len+1, sizeof(proto_str)));
+
+    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;
 }
 
-#ifdef CONFIG_MUXERS
-int url_write(URLContext *h, unsigned char *buf, int size)
+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;
-    if (!(h->flags & (URL_WRONLY | URL_RDWR)))
-        return AVERROR_IO;
+    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 (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_IO;
-    ret = h->prot->url_write(h, buf, size);
-    return ret;
+        return AVERROR(EIO);
+
+    return retry_transfer_wrapper(h, buf, size, size, h->prot->url_write);
 }
-#endif //CONFIG_MUXERS
 
-offset_t url_seek(URLContext *h, offset_t pos, int whence)
+int64_t ffurl_seek(URLContext *h, int64_t pos, int whence)
 {
-    offset_t ret;
+    int64_t ret;
 
     if (!h->prot->url_seek)
-        return -EPIPE;
-    ret = h->prot->url_seek(h, pos, whence);
+        return AVERROR(ENOSYS);
+    ret = h->prot->url_seek(h, pos, whence & ~AVSEEK_FORCE);
     return ret;
 }
 
-int url_close(URLContext *h)
+int ffurl_close(URLContext *h)
 {
-    int ret;
+    int ret = 0;
+    if (!h) return 0; /* can happen when ffurl_open fails */
 
-    ret = h->prot->url_close(h);
+    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;
 }
 
-int url_exist(const char *filename)
+int avio_check(const char *url, int flags)
 {
     URLContext *h;
-    if (url_open(&h, filename, URL_RDONLY) < 0)
-        return 0;
-    url_close(h);
-    return 1;
-}
+    int ret = ffurl_alloc(&h, url, flags, NULL);
+    if (ret)
+        return ret;
 
-offset_t url_filesize(URLContext *h)
-{
-    offset_t pos, size;
+    if (h->prot->url_check) {
+        ret = h->prot->url_check(h, flags);
+    } else {
+        ret = ffurl_connect(h, NULL);
+        if (ret >= 0)
+            ret = flags;
+    }
 
-    pos = url_seek(h, 0, SEEK_CUR);
-    size = url_seek(h, -1, SEEK_END)+1;
-    url_seek(h, pos, SEEK_SET);
-    return size;
+    ffurl_close(h);
+    return ret;
 }
 
-/*
- * Return the maximum packet size associated to packetized file
- * handle. If the file is not packetized (stream like http or file on
- * disk), then 0 is returned.
- *
- * @param h file handle
- * @return maximum packet size in bytes
- */
-int url_get_max_packet_size(URLContext *h)
+int64_t ffurl_size(URLContext *h)
 {
-    return h->max_packet_size;
-}
+    int64_t pos, size;
 
-void url_get_filename(URLContext *h, char *buf, int buf_size)
-{
-    pstrcpy(buf, buf_size, h->filename);
+    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;
 }
 
-
-static int default_interrupt_cb(void)
+int ffurl_get_file_handle(URLContext *h)
 {
-    return 0;
+    if (!h->prot->url_get_file_handle)
+        return -1;
+    return h->prot->url_get_file_handle(h);
 }
 
-/**
- * The callback is called in blocking functions to test regulary if
- * asynchronous interruption is needed. -EINTR is returned in this
- * case by the interrupted function. 'NULL' means no interrupt
- * callback is given.
- */
-void url_set_interrupt_cb(URLInterruptCB *interrupt_cb)
+int ff_check_interrupt(AVIOInterruptCB *cb)
 {
-    if (!interrupt_cb)
-        interrupt_cb = default_interrupt_cb;
-    url_interrupt_cb = interrupt_cb;
+    int ret;
+    if (cb && cb->callback && (ret = cb->callback(cb->opaque)))
+        return ret;
+    return 0;
 }