mpv/stream/stream_netstream.c

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/*
* Copyright (C) Alban Bedel - 04/2003
*
* This file is part of MPlayer.
*
* MPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MPlayer 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* Net stream allow you to access MPlayer stream accross a tcp
* connection.
* Note that at least mf and tv use a dummy stream (they are
* implemented at the demuxer level) so you won't be able to
* access those :(( but dvd, vcd and so on should work perfectly
* (if you have the bandwidth ;)
* A simple server is in TOOLS/netstream.
*
*/
#include "config.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <inttypes.h>
#include <errno.h>
#if !HAVE_WINSOCK2_H
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#else
#include <winsock2.h>
#endif
#include "mp_msg.h"
#include "stream.h"
#include "m_option.h"
#include "m_struct.h"
#include "libavutil/common.h"
#include "mpbswap.h"
#include "network.h"
#include "stream_netstream.h"
#include "tcp.h"
static struct stream_priv_s {
char* host;
int port;
char* url;
} stream_priv_dflts = {
NULL,
10000,
NULL
};
#define ST_OFF(f) M_ST_OFF(struct stream_priv_s,f)
/// URL definition
static const m_option_t stream_opts_fields[] = {
{"hostname", ST_OFF(host), CONF_TYPE_STRING, 0, 0 ,0, NULL},
{"port", ST_OFF(port), CONF_TYPE_INT, M_OPT_MIN, 1 ,0, NULL},
{"filename", ST_OFF(url), CONF_TYPE_STRING, 0, 0 ,0, NULL},
{ NULL, NULL, 0, 0, 0, 0, NULL }
};
static const struct m_struct_st stream_opts = {
"netstream",
sizeof(struct stream_priv_s),
&stream_priv_dflts,
stream_opts_fields
};
//// When the cache is running we need a lock as
//// fill_buffer is called from another proccess
static int lock_fd(int fd) {
#if !HAVE_WINSOCK2_H
struct flock lock;
memset(&lock,0,sizeof(struct flock));
lock.l_type = F_WRLCK;
mp_msg(MSGT_STREAM,MSGL_DBG2, "Lock (%d)\n",getpid());
do {
if(fcntl(fd,F_SETLKW,&lock)) {
if(errno == EAGAIN) continue;
mp_msg(MSGT_STREAM,MSGL_ERR, "Failed to get the lock: %s\n",
strerror(errno));
return 0;
}
} while(0);
mp_msg(MSGT_STREAM,MSGL_DBG2, "Locked (%d)\n",getpid());
#else
printf("FIXME? should lock here\n");
#endif
return 1;
}
static int unlock_fd(int fd) {
#if !HAVE_WINSOCK2_H
struct flock lock;
memset(&lock,0,sizeof(struct flock));
lock.l_type = F_UNLCK;
mp_msg(MSGT_STREAM,MSGL_DBG2, "Unlock (%d)\n",getpid());
if(fcntl(fd,F_SETLK,&lock)) {
mp_msg(MSGT_STREAM,MSGL_ERR, "Failed to release the lock: %s\n",
strerror(errno));
return 0;
}
#else
printf("FIXME? should unlock here\n");
#endif
return 1;
}
static mp_net_stream_packet_t* send_net_stream_cmd(stream_t *s,uint16_t cmd,char* data,int len) {
mp_net_stream_packet_t* pack;
// Cache is enabled : lock
if(s->cache_data && !lock_fd(s->fd))
return NULL;
// Send a command
if(!write_packet(s->fd,cmd,data,len)) {
if(s->cache_data) unlock_fd(s->fd);
return 0;
}
// Read the response
pack = read_packet(s->fd);
// Now we can unlock
if(s->cache_data) unlock_fd(s->fd);
if(!pack)
return NULL;
switch(pack->cmd) {
case NET_STREAM_OK:
return pack;
case NET_STREAM_ERROR:
if(pack->len > sizeof(mp_net_stream_packet_t))
mp_msg(MSGT_STREAM,MSGL_ERR, "Fill buffer failed: %s\n",pack->data);
else
mp_msg(MSGT_STREAM,MSGL_ERR, "Fill buffer failed\n");
free(pack);
return NULL;
}
mp_msg(MSGT_STREAM,MSGL_ERR, "Unknown response to %d: %d\n",cmd,pack->cmd);
free(pack);
return NULL;
}
static int fill_buffer(stream_t *s, char* buffer, int max_len){
uint16_t len = le2me_16(max_len);
mp_net_stream_packet_t* pack;
pack = send_net_stream_cmd(s,NET_STREAM_FILL_BUFFER,(char*)&len,2);
if(!pack) {
return -1;
}
len = pack->len - sizeof(mp_net_stream_packet_t);
if(len > max_len) {
mp_msg(MSGT_STREAM,MSGL_ERR, "Got a too big a packet %d / %d\n",len,max_len);
free(pack);
return 0;
}
if(len > 0)
memcpy(buffer,pack->data,len);
free(pack);
return len;
}
static int seek(stream_t *s,off_t newpos) {
uint64_t pos = le2me_64((uint64_t)newpos);
mp_net_stream_packet_t* pack;
pack = send_net_stream_cmd(s,NET_STREAM_SEEK,(char*)&pos,8);
if(!pack) {
return 0;
}
s->pos = newpos;
free(pack);
return 1;
}
static int net_stream_reset(struct stream *s) {
mp_net_stream_packet_t* pack;
pack = send_net_stream_cmd(s,NET_STREAM_RESET,NULL,0);
if(!pack) {
return 0;
}
free(pack);
return 1;
}
static int control(struct stream *s,int cmd,void* arg) {
switch(cmd) {
case STREAM_CTRL_RESET:
return net_stream_reset(s);
}
return STREAM_UNSUPPORTED;
}
static void close_s(struct stream *s) {
mp_net_stream_packet_t* pack;
pack = send_net_stream_cmd(s,NET_STREAM_CLOSE,NULL,0);
if(pack)
free(pack);
}
static int open_s(stream_t *stream,int mode, void* opts, int* file_format) {
int f;
struct stream_priv_s* p = (struct stream_priv_s*)opts;
mp_net_stream_packet_t* pack;
mp_net_stream_opened_t* opened;
if(mode != STREAM_READ)
return STREAM_UNSUPPORTED;
if(!p->host) {
mp_msg(MSGT_OPEN,MSGL_ERR, "We need an host name (ex: mpst://server.net/cdda://5)\n");
m_struct_free(&stream_opts,opts);
return STREAM_ERROR;
}
if(!p->url || strlen(p->url) == 0) {
mp_msg(MSGT_OPEN,MSGL_ERR, "We need a remote url (ex: mpst://server.net/cdda://5)\n");
m_struct_free(&stream_opts,opts);
return STREAM_ERROR;
}
f = connect2Server(p->host,p->port,1);
if(f < 0) {
mp_msg(MSGT_OPEN,MSGL_ERR, "Connection to %s:%d failed\n",p->host,p->port);
m_struct_free(&stream_opts,opts);
return STREAM_ERROR;
}
stream->fd = f;
/// Now send an open command
pack = send_net_stream_cmd(stream,NET_STREAM_OPEN,p->url,strlen(p->url) + 1);
if(!pack) {
goto error;
}
if(pack->len != sizeof(mp_net_stream_packet_t) +
sizeof(mp_net_stream_opened_t)) {
mp_msg(MSGT_OPEN,MSGL_ERR, "Invalid open response packet len (%d bytes)\n",pack->len);
free(pack);
goto error;
}
opened = (mp_net_stream_opened_t*)pack->data;
net_stream_opened_2_me(opened);
*file_format = opened->file_format;
stream->flags = opened->flags;
stream->sector_size = opened->sector_size;
stream->start_pos = opened->start_pos;
stream->end_pos = opened->end_pos;
stream->fill_buffer = fill_buffer;
stream->control = control;
if(stream->flags & MP_STREAM_SEEK)
stream->seek = seek;
stream->close = close_s;
free(pack);
m_struct_free(&stream_opts,opts);
return STREAM_OK;
error:
closesocket(f);
m_struct_free(&stream_opts,opts);
return STREAM_ERROR;
}
const stream_info_t stream_info_netstream = {
"Net stream",
"netstream",
"Albeu",
"",
open_s,
{ "mpst",NULL },
&stream_opts,
1 // Url is an option string
};