size_t header_len;
};
+/**
+ * The list of currently connected fec clients.
+ *
+ * Senders may use \ref vss_add_fec_client() to add entries to the list.
+ */
static struct list_head fec_client_list;
+/**
+ * Describes one slice of a FEC group.
+ *
+ * FEC slices directly correspond to the data packages sent by the paraslash
+ * senders that use FEC. Each slice is identified by its group number and its
+ * number within the group. All slices have the same size, but the last slice
+ * of the group may not be filled entirely.
+ */
struct fec_slice {
+ /** The slice number within the FEC group. */
uint8_t num;
+ /** The number of used bytes in this slice. */
uint16_t bytes;
};
+/**
+ * Data associated with one FEC group.
+ *
+ * A FEC group consists of a fixed number of slices and this number is given by
+ * the \a slices_per_group parameter of struct \ref fec_client_parms. Each FEC
+ * group contains a number of chunks of the current audio file.
+ */
struct fec_group {
+ /** The number of the FEC group. */
uint32_t num;
+ /** Number of bytes in this group. */
uint32_t bytes;
+ /** The first chunk of the current audio file belonging to the group. */
uint32_t first_chunk;
+ /** The number of chunks contained in this group. */
uint32_t num_chunks;
+ /** The time needed to play all chunks of the group. */
struct timeval duration;
+ /** When the first chunk was sent. */
struct timeval start;
+ /** \a The group duration divided by \a slices_per_group. */
struct timeval slice_duration;
};
+/**
+ * Describes one connected FEC client.
+ */
struct fec_client {
+ /** Parameters requested by the client. */
struct fec_client_parms *fcp;
+ /** Used by the core FEC code. */
struct fec_parms *parms;
+ /** The position of this client in the fec client list. */
struct list_head node;
+ /** When the first slice for this client was sent. */
struct timeval stream_start;
+ /** The first chunk sent to this FEC client. */
int first_stream_chunk;
+ /** Describes the current group. */
struct fec_group group;
+ /** Describes the current slice. */
struct fec_slice slice;
+ /** The data to be FEC-encoded (point to a region within the mapped audio file). */
const unsigned char **src_data;
+ /** Used for the last source pointer of the last group. */
unsigned char *extra_src_buf;
+ /** The size of the buffer for the extra source pointer. */
size_t extra_src_buf_size;
+ /** Contains FEC-encoded data. */
unsigned char *enc_buf;
+ /** Size of \a enc_buf. */
size_t enc_buf_size;
};
{
uint32_t num_bytes = 0, chunk_num, max_group_size, last_payload_size;
int i, k = fc->fcp->data_slices_per_group;
- const unsigned char *start_buf = NULL;
+ const char *start_buf = NULL;
struct timeval tmp, *chunk_tv = vss_chunk_time();
assert(chunk_tv);
max_group_size = (fc->fcp->max_slice_bytes - FEC_HEADER_SIZE) * k;
chunk_num = fc->group.first_chunk;
for (;;) {
- const unsigned char *buf;
+ const char *buf;
size_t len;
if (chunk_num >= mmd->afd.afhi.chunks_total)
break;
- afh_get_chunk(chunk_num, &mmd->afd.afhi, vsst->map, (const char **)&buf, &len);
+ afh_get_chunk(chunk_num, &mmd->afd.afhi, vsst->map, &buf, &len);
if (!start_buf)
start_buf = buf;
if (num_bytes + len > max_group_size)
&fc->group.slice_duration);
for (i = 0; i < k; i++)
- fc->src_data[i] = start_buf + i * fc->slice.bytes;
+ fc->src_data[i] = (const unsigned char *)start_buf
+ + i * fc->slice.bytes;
- if ((char *)start_buf + k * fc->slice.bytes > vsst->map + mmd->size) {
+ if (start_buf + k * fc->slice.bytes > vsst->map + mmd->size) {
/* can not use last slice as it goes beyond the map */
if (fc->extra_src_buf_size < fc->slice.bytes)
fc->extra_src_buf = para_realloc(fc->extra_src_buf, fc->slice.bytes);
/**
* Return a buffer that marks the end of the stream.
*
+ * \param buf Result pointer.
* \return The length of the eof buffer.
*
* This is used for (multicast) udp streaming where closing the socket on the
/**
* Remove one entry from the list of active fec clients.
*
- * \param result The client to be removed.
+ * \param fc The client to be removed.
*/
void vss_del_fec_client(struct fec_client *fc)
{
assert(vss_playing());
list_for_each_entry(fc, &fec_client_list, node) {
struct timeval diff;
- int ret = next_slice_is_due(fc, &diff);
- // PARA_NOTICE_LOG("diff: %lu, ret: %d\n", tv2ms(&diff), ret);
- if (ret) {
+ if (next_slice_is_due(fc, &diff)) {
timeout->tv_sec = 0;
timeout->tv_usec = 0;
- goto out;
+ return;
}
/* timeout = min(timeout, diff) */
if (tv_diff(&diff, timeout, NULL) < 0)
*timeout = diff;
}
-out:
- return;
- PARA_NOTICE_LOG("slice timeout: %lu:%lu\n", (long unsigned)timeout->tv_sec, (long unsigned)timeout->tv_usec);
}
/**