2 * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
6 /** \file udp_recv.c Paraslash's udp receiver */
11 #include "portable_io.h"
12 #include "udp_header.h"
17 #include "udp_recv.cmdline.h"
24 /** The size of the receiver node buffer. */
25 #define UDP_RECV_CHUNK_SIZE (128 * 1024)
28 * Data specific to the udp receiver.
30 * \sa \ref receiver, \ref receiver_node.
32 struct private_udp_recv_data
{
34 * Whether a header was received.
36 * A flag indicating whether this receiver already received a packet
37 * which contains the audio file header.
39 * This flag has no effect if the audio stream indicates that no extra
40 * headers will be sent (mp3, aac). Otherwise, all data packets are
41 * dropped until the header is received.
44 /** The socket file descriptor. */
48 static void udp_recv_pre_select(struct sched
*s
, struct task
*t
)
50 struct receiver_node
*rn
= container_of(t
, struct receiver_node
, task
);
51 struct private_udp_recv_data
*purd
= rn
->private_data
;
53 para_fd_set(purd
->fd
, &s
->rfds
, &s
->max_fileno
);
56 static int enough_space(size_t nbytes
, size_t loaded
)
58 return nbytes
+ loaded
< UDP_RECV_CHUNK_SIZE
;
61 static void udp_recv_post_select(__a_unused
struct sched
*s
, struct task
*t
)
63 struct receiver_node
*rn
= container_of(t
, struct receiver_node
, task
);
64 struct private_udp_recv_data
*purd
= rn
->private_data
;
66 char tmpbuf
[UDP_RECV_CHUNK_SIZE
];
68 uint8_t stream_type
, packet_type
;
70 if (rn
->output_error
&& *rn
->output_error
< 0) {
71 t
->error
= *rn
->output_error
;
74 if (!FD_ISSET(purd
->fd
, &s
->rfds
))
76 ret
= recv_bin_buffer(purd
->fd
, tmpbuf
, UDP_RECV_CHUNK_SIZE
);
78 if (is_errno(ret
, EINTR
) || is_errno(ret
, EAGAIN
))
83 t
->error
= -E_RECV_EOF
;
87 t
->error
= -E_UDP_SHORT_PACKET
;
88 if (packet_size
< UDP_AUDIO_HEADER_LEN
)
90 t
->error
= -E_UDP_NO_MAGIC
;
91 if (udp_check_magic(tmpbuf
, packet_size
) < 0)
93 stream_type
= udp_read_stream_type(tmpbuf
);
94 packet_type
= udp_read_packet_type(tmpbuf
);
95 // PARA_INFO_LOG("packet type: %d, stream type: %d,"
96 // " loaded: %u\n", packet_type,
97 // (unsigned) stream_type, rn->loaded);
98 switch (packet_type
) {
99 uint16_t header_len
, payload_len
;
102 t
->error
= -E_RECV_EOF
;
105 PARA_INFO_LOG("bof (%zu)\n", packet_size
);
106 purd
->have_header
= 1;
108 case UDP_DATA_PACKET
:
109 if (!purd
->have_header
&& stream_type
== UDP_HEADER_STREAM
)
110 /* can't use the data, wait for header */
112 payload_len
= packet_size
- UDP_AUDIO_HEADER_LEN
;
115 t
->error
= -E_OVERRUN
;
116 if (!enough_space(payload_len
, rn
->loaded
))
118 memcpy(rn
->buf
+ rn
->loaded
, tmpbuf
+ UDP_AUDIO_HEADER_LEN
,
120 rn
->loaded
+= payload_len
;
122 case UDP_HEADER_PACKET
:
123 header_len
= udp_read_header_len(tmpbuf
);
124 if (header_len
+ UDP_AUDIO_HEADER_LEN
> packet_size
) {
125 t
->error
= -E_INVALID_HEADER
;
128 // PARA_DEBUG_LOG("header packet (%zu bytes), header len: %d\n",
129 // packet_size, header_len);
130 if (!purd
->have_header
) {
131 t
->error
= -E_OVERRUN
;
132 if (!enough_space(header_len
, rn
->loaded
))
134 purd
->have_header
= 1;
135 rn
->loaded
= header_len
;
136 memcpy(rn
->buf
, tmpbuf
+ UDP_AUDIO_HEADER_LEN
,
140 payload_len
= packet_size
- UDP_AUDIO_HEADER_LEN
- header_len
;
143 t
->error
= -E_OVERRUN
;
144 if (!enough_space(payload_len
, rn
->loaded
))
146 memcpy(rn
->buf
+ rn
->loaded
, tmpbuf
+ UDP_AUDIO_HEADER_LEN
+
147 header_len
, payload_len
);
148 rn
->loaded
+= payload_len
;
154 static void udp_shutdown(void)
159 static void udp_recv_close(struct receiver_node
*rn
)
161 struct private_udp_recv_data
*purd
= rn
->private_data
;
165 free(rn
->private_data
);
169 static void *udp_recv_parse_config(int argc
, char **argv
)
172 struct udp_recv_args_info
*tmp
=
173 para_calloc(sizeof(struct udp_recv_args_info
));
175 ret
= udp_recv_cmdline_parser(argc
, argv
, tmp
)? -E_UDP_SYNTAX
: 1;
182 static int udp_recv_open(struct receiver_node
*rn
)
184 struct private_udp_recv_data
*purd
;
185 struct udp_recv_args_info
*c
= rn
->conf
;
188 rn
->buf
= para_calloc(UDP_RECV_CHUNK_SIZE
);
189 rn
->private_data
= para_calloc(sizeof(struct private_udp_recv_data
));
190 purd
= rn
->private_data
;
191 ret
= create_udp_recv_socket(c
->host_arg
, c
->port_arg
);
195 ret
= mark_fd_nonblocking(purd
->fd
);
198 PARA_NOTICE_LOG("receiving from %s:%d, fd=%d\n", c
->host_arg
,
199 c
->port_arg
, purd
->fd
);
204 * The init function of the udp receiver.
206 * \param r Pointer to the receiver struct to initialize.
208 * Initialize all function pointers of \a r.
210 void udp_recv_init(struct receiver
*r
)
212 struct udp_recv_args_info dummy
;
214 udp_recv_cmdline_parser_init(&dummy
);
215 r
->shutdown
= udp_shutdown
;
216 r
->open
= udp_recv_open
;
217 r
->close
= udp_recv_close
;
218 r
->pre_select
= udp_recv_pre_select
;
219 r
->post_select
= udp_recv_post_select
;
220 r
->parse_config
= udp_recv_parse_config
;
221 r
->help
= (struct ggo_help
) {
222 .short_help
= udp_recv_args_info_help
,
223 .detailed_help
= udp_recv_args_info_detailed_help