*/
/** \file udp_recv.c Paraslash's udp receiver */
+#include <regex.h>
#include <dirent.h>
+#include <sys/socket.h>
+#include <net/if.h>
#include "para.h"
#include "error.h"
#include "portable_io.h"
-#include "udp_header.h"
#include "list.h"
#include "sched.h"
#include "ggo.h"
/** The size of the receiver node buffer. */
#define UDP_RECV_CHUNK_SIZE (128 * 1024)
-
/**
* Data specific to the udp receiver.
*
* \sa \ref receiver, \ref receiver_node.
*/
struct private_udp_recv_data {
- /**
- * Whether a header was received.
- *
- * A flag indicating whether this receiver already received a packet
- * which contains the audio file header.
- *
- * This flag has no effect if the audio stream indicates that no extra
- * headers will be sent (mp3, aac). Otherwise, all data packets are
- * dropped until the header is received.
- */
- int have_header;
/** The socket file descriptor. */
int fd;
- /** Non-zero on short reads. */
- uint16_t need_more;
- /** Copied from the first audio header received. */
- uint16_t stream_type;
};
static void udp_recv_pre_select(struct sched *s, struct task *t)
return nbytes + loaded < UDP_RECV_CHUNK_SIZE;
}
-/*
- * Perform some sanity checks on an udp audio file header.
- *
- * return: negative on error, 0: discard data, 1: use data
- */
-static int examine_audio_header(struct private_udp_recv_data *purd,
- struct udp_audio_header *uah, size_t packet_size)
-{
- /* payload_len includes header */
- if (uah->payload_len < uah->header_len)
- return -E_UDP_BAD_HEADER;
- switch (uah->packet_type) {
- case UDP_EOF_PACKET:
- return -E_RECV_EOF;
- case UDP_BOF_PACKET:
- purd->have_header = 1;
- /* fall through */
- case UDP_DATA_PACKET:
- if (uah->header_len) /* header in no-header packet */
- return -E_UDP_BAD_HEADER;
- break;
- case UDP_HEADER_PACKET:
- if (!uah->header_len) /** no header in header packet */
- return -E_UDP_BAD_HEADER;
- break;
- default: /* bad packet type */
- return -E_UDP_BAD_HEADER;
- }
- /* check stream type */
- if (uah->stream_type != UDP_PLAIN_STREAM &&
- uah->stream_type != UDP_HEADER_STREAM)
- return -E_UDP_BAD_STREAM_TYPE;
- if (purd->stream_type == UDP_UNKNOWN_STREAM)
- purd->stream_type = uah->stream_type;
- /* stream type must not change */
- if (uah->stream_type != purd->stream_type)
- return -E_UDP_BAD_STREAM_TYPE;
- if (!purd->have_header && uah->stream_type == UDP_HEADER_STREAM)
- /* can't use the data, wait for header packet */
- return 0;
- if (packet_size < uah->payload_len + UDP_AUDIO_HEADER_LEN)
- /* we read only a part of the package */
- purd->need_more = uah->payload_len
- + UDP_AUDIO_HEADER_LEN - packet_size;
- return 1;
-}
-
static int add_rn_output(struct receiver_node *rn, char *buf, size_t len)
{
if (!len)
struct private_udp_recv_data *purd = rn->private_data;
int ret;
char tmpbuf[UDP_RECV_CHUNK_SIZE];
- uint16_t data_len;
- char *data_buf;
size_t packet_size;
- struct udp_audio_header uah;
if (rn->output_error && *rn->output_error < 0) {
t->error = *rn->output_error;
if (!ret)
return;
packet_size = ret;
- for (;;) {
- uint16_t num;
-
- if (!purd->need_more) {
- ret = read_udp_audio_header(tmpbuf, packet_size, &uah);
- if (ret >= 0)
- break;
- goto success; /* drop data */
- }
- num = PARA_MIN(purd->need_more, (uint16_t)packet_size);
- assert(num > 0);
- t->error = add_rn_output(rn, tmpbuf, num);
- if (t->error < 0)
+ if (packet_size >= FEC_EOF_PACKET_LEN)
+ if (!memcmp(tmpbuf, FEC_EOF_PACKET, FEC_EOF_PACKET_LEN))
return;
- purd->need_more -= num;
- if (packet_size <= num)
- goto success;
- packet_size -= num;
- memmove(tmpbuf, tmpbuf + num, packet_size);
- }
- assert(!purd->need_more);
- t->error = examine_audio_header(purd, &uah, packet_size);
- if (t->error <= 0)
+ t->error = add_rn_output(rn, tmpbuf, packet_size);
+ if (t->error < 0)
return;
- data_len = uah.payload_len;
- data_buf = tmpbuf + UDP_AUDIO_HEADER_LEN;
- if (uah.packet_type == UDP_HEADER_PACKET) {
- if (purd->have_header) { /* skip header */
- data_buf += uah.header_len;
- data_len -= uah.header_len;
- } else { /* only use the header */
- purd->have_header = 1;
- data_len = uah.header_len;
- }
- }
- t->error = add_rn_output(rn, data_buf, data_len);
- return;
success:
t->error = 1;
}
ret = mark_fd_nonblocking(purd->fd);
if (ret < 0)
goto err;
- purd->stream_type = UDP_UNKNOWN_STREAM;
PARA_NOTICE_LOG("receiving from %s:%d, fd=%d\n", c->host_arg,
c->port_arg, purd->fd);
return purd->fd;
projects / paraslash.git / blobdiff