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FFmpeg/libavformat/tcp.c
Perette Barella 84110f4f77 libavformat/tcp.c : add send_buffer_size and recv_buffer_size options 
adds two new options that may be set via the dictionary:

- send_buffer_size
- recv_buffer_size

When present, setsockopt() is used with SO_SNDBUF and SO_RCVBUF to set
socket buffer sizes.  I chose to make send and receive independent
because buffering requirements are often asymmetric.

Errors in setting the buffer size mean the socket will use its
default, so they are ignored.

There is no sanity checking on values, as the kernel/socket layers
already impose reasonable limits if asked for something crazy.

Rationale for enlarging receive buffers is to reduce susceptibility
to intermittent network delays/congestion.  I added setting the send
buffer for symmetry.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2016-01-22 15:36:30 +01:00

271 lines
8.2 KiB
C
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/*
* TCP protocol
* Copyright (c) 2002 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
#include "libavutil/avassert.h"
#include "libavutil/parseutils.h"
#include "libavutil/opt.h"
#include "libavutil/time.h"
#include "internal.h"
#include "network.h"
#include "os_support.h"
#include "url.h"
#if HAVE_POLL_H
#include <poll.h>
#endif
typedef struct TCPContext {
const AVClass *class;
int fd;
int listen;
int open_timeout;
int rw_timeout;
int listen_timeout;
int recv_buffer_size;
int send_buffer_size;
} TCPContext;
#define OFFSET(x) offsetof(TCPContext, x)
#define D AV_OPT_FLAG_DECODING_PARAM
#define E AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "listen", "Listen for incoming connections", OFFSET(listen), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, .flags = D|E },
{ "timeout", "set timeout (in microseconds) of socket I/O operations", OFFSET(rw_timeout), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
{ "listen_timeout", "Connection awaiting timeout (in milliseconds)", OFFSET(listen_timeout), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
{ "send_buffer_size", "Socket send buffer size (in bytes)", OFFSET(send_buffer_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
{ "recv_buffer_size", "Socket receive buffer size (in bytes)", OFFSET(recv_buffer_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
{ NULL }
};
static const AVClass tcp_class = {
.class_name = "tcp",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
/* return non zero if error */
static int tcp_open(URLContext *h, const char *uri, int flags)
{
struct addrinfo hints = { 0 }, *ai, *cur_ai;
int port, fd = -1;
TCPContext *s = h->priv_data;
const char *p;
char buf[256];
int ret;
char hostname[1024],proto[1024],path[1024];
char portstr[10];
s->open_timeout = 5000000;
av_url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname),
&port, path, sizeof(path), uri);
if (strcmp(proto, "tcp"))
return AVERROR(EINVAL);
if (port <= 0 || port >= 65536) {
av_log(h, AV_LOG_ERROR, "Port missing in uri\n");
return AVERROR(EINVAL);
}
p = strchr(uri, '?');
if (p) {
if (av_find_info_tag(buf, sizeof(buf), "listen", p)) {
char *endptr = NULL;
s->listen = strtol(buf, &endptr, 10);
/* assume if no digits were found it is a request to enable it */
if (buf == endptr)
s->listen = 1;
}
if (av_find_info_tag(buf, sizeof(buf), "timeout", p)) {
s->rw_timeout = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "listen_timeout", p)) {
s->listen_timeout = strtol(buf, NULL, 10);
}
}
if (s->rw_timeout >= 0) {
s->open_timeout =
h->rw_timeout = s->rw_timeout;
}
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
snprintf(portstr, sizeof(portstr), "%d", port);
if (s->listen)
hints.ai_flags |= AI_PASSIVE;
if (!hostname[0])
ret = getaddrinfo(NULL, portstr, &hints, &ai);
else
ret = getaddrinfo(hostname, portstr, &hints, &ai);
if (ret) {
av_log(h, AV_LOG_ERROR,
"Failed to resolve hostname %s: %s\n",
hostname, gai_strerror(ret));
return AVERROR(EIO);
}
cur_ai = ai;
restart:
fd = ff_socket(cur_ai->ai_family,
cur_ai->ai_socktype,
cur_ai->ai_protocol);
if (fd < 0) {
ret = ff_neterrno();
goto fail;
}
if (s->listen == 2) {
// multi-client
if ((ret = ff_listen(fd, cur_ai->ai_addr, cur_ai->ai_addrlen)) < 0)
goto fail1;
} else if (s->listen == 1) {
// single client
if ((ret = ff_listen_bind(fd, cur_ai->ai_addr, cur_ai->ai_addrlen,
s->listen_timeout, h)) < 0)
goto fail1;
// Socket descriptor already closed here. Safe to overwrite to client one.
fd = ret;
} else {
if ((ret = ff_listen_connect(fd, cur_ai->ai_addr, cur_ai->ai_addrlen,
s->open_timeout / 1000, h, !!cur_ai->ai_next)) < 0) {
if (ret == AVERROR_EXIT)
goto fail1;
else
goto fail;
}
}
h->is_streamed = 1;
s->fd = fd;
/* Set the socket's send or receive buffer sizes, if specified.
If unspecified or setting fails, system default is used. */
if (s->recv_buffer_size > 0) {
setsockopt (fd, SOL_SOCKET, SO_RCVBUF, &s->recv_buffer_size, sizeof (s->recv_buffer_size));
}
if (s->send_buffer_size > 0) {
setsockopt (fd, SOL_SOCKET, SO_SNDBUF, &s->send_buffer_size, sizeof (s->send_buffer_size));
}
freeaddrinfo(ai);
return 0;
fail:
if (cur_ai->ai_next) {
/* Retry with the next sockaddr */
cur_ai = cur_ai->ai_next;
if (fd >= 0)
closesocket(fd);
ret = 0;
goto restart;
}
fail1:
if (fd >= 0)
closesocket(fd);
freeaddrinfo(ai);
return ret;
}
static int tcp_accept(URLContext *s, URLContext **c)
{
TCPContext *sc = s->priv_data;
TCPContext *cc;
int ret;
av_assert0(sc->listen);
if ((ret = ffurl_alloc(c, s->filename, s->flags, &s->interrupt_callback)) < 0)
return ret;
cc = (*c)->priv_data;
ret = ff_accept(sc->fd, sc->listen_timeout, s);
if (ret < 0)
return ff_neterrno();
cc->fd = ret;
return 0;
}
static int tcp_read(URLContext *h, uint8_t *buf, int size)
{
TCPContext *s = h->priv_data;
int ret;
if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
ret = ff_network_wait_fd_timeout(s->fd, 0, h->rw_timeout, &h->interrupt_callback);
if (ret)
return ret;
}
ret = recv(s->fd, buf, size, 0);
return ret < 0 ? ff_neterrno() : ret;
}
static int tcp_write(URLContext *h, const uint8_t *buf, int size)
{
TCPContext *s = h->priv_data;
int ret;
if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
ret = ff_network_wait_fd_timeout(s->fd, 1, h->rw_timeout, &h->interrupt_callback);
if (ret)
return ret;
}
ret = send(s->fd, buf, size, MSG_NOSIGNAL);
return ret < 0 ? ff_neterrno() : ret;
}
static int tcp_shutdown(URLContext *h, int flags)
{
TCPContext *s = h->priv_data;
int how;
if (flags & AVIO_FLAG_WRITE && flags & AVIO_FLAG_READ) {
how = SHUT_RDWR;
} else if (flags & AVIO_FLAG_WRITE) {
how = SHUT_WR;
} else {
how = SHUT_RD;
}
return shutdown(s->fd, how);
}
static int tcp_close(URLContext *h)
{
TCPContext *s = h->priv_data;
closesocket(s->fd);
return 0;
}
static int tcp_get_file_handle(URLContext *h)
{
TCPContext *s = h->priv_data;
return s->fd;
}
URLProtocol ff_tcp_protocol = {
.name = "tcp",
.url_open = tcp_open,
.url_accept = tcp_accept,
.url_read = tcp_read,
.url_write = tcp_write,
.url_close = tcp_close,
.url_get_file_handle = tcp_get_file_handle,
.url_shutdown = tcp_shutdown,
.priv_data_size = sizeof(TCPContext),
.flags = URL_PROTOCOL_FLAG_NETWORK,
.priv_data_class = &tcp_class,
};
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