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 packet_size, size_t loaded)
58 return packet_size + loaded < UDP_RECV_CHUNK_SIZE + UDP_AUDIO_HEADER_LEN;
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);
79 if (errno != EINTR && errno != EAGAIN)
80 t->error = -ERRNO_TO_PARA_ERROR(errno);
84 if (packet_size < UDP_AUDIO_HEADER_LEN) {
85 t->error = -E_UDP_SHORT_PACKET; /* FIXME: We shouldn't fail here */
88 if (udp_check_magic(tmpbuf, packet_size) < 0) {
89 t->error = -E_UDP_NO_MAGIC;
92 stream_type = udp_read_stream_type(tmpbuf);
93 packet_type = udp_read_packet_type(tmpbuf);
94 // PARA_INFO_LOG("packet type: %d, stream type: %d,"
95 // " loaded: %u\n", packet_type,
96 // (unsigned) stream_type, rn->loaded);
97 switch (packet_type) {
98 uint16_t header_len, payload_len;
100 t->error = -E_RECV_EOF;
103 PARA_INFO_LOG("bof (%zu)\n", packet_size);
104 purd->have_header = 1;
106 case UDP_DATA_PACKET:
107 if (!purd->have_header && stream_type == UDP_HEADER_STREAM)
108 /* can't use the data, wait for header */
110 if (!enough_space(packet_size, rn->loaded)) {
111 t->error = -E_OVERRUN;
114 if (packet_size > UDP_AUDIO_HEADER_LEN) {
115 memcpy(rn->buf + rn->loaded, tmpbuf + UDP_AUDIO_HEADER_LEN,
116 packet_size - UDP_AUDIO_HEADER_LEN);
117 rn->loaded += packet_size - UDP_AUDIO_HEADER_LEN;
120 case UDP_HEADER_PACKET:
121 if (!enough_space(packet_size, rn->loaded)) {
122 t->error = -E_OVERRUN;
125 header_len = udp_read_header_len(tmpbuf);
126 if (header_len + UDP_AUDIO_HEADER_LEN > packet_size) {
127 t->error = -E_INVALID_HEADER;
130 // PARA_DEBUG_LOG("header packet (%zu bytes), header len: %d\n",
131 // packet_size, header_len);
132 if (!purd->have_header) {
133 purd->have_header = 1;
134 rn->loaded = header_len;
135 memcpy(rn->buf, tmpbuf + UDP_AUDIO_HEADER_LEN,
140 payload_len = packet_size - UDP_AUDIO_HEADER_LEN - header_len;
141 if (rn->loaded + payload_len > UDP_RECV_CHUNK_SIZE) {
142 t->error = -E_OVERRUN;
146 memcpy(rn->buf + rn->loaded, tmpbuf
147 + (packet_size - payload_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