/* called from the source thread when the metadata has been updated.
* The artist title are checked and made ready for clients to send
*/
static void mp3_set_title (source_t *source)
{
const char meta[] = "StreamTitle='";
int size;
unsigned char len_byte;
refbuf_t *p;
unsigned int len = sizeof(meta) + 2; /* the StreamTitle, quotes, ; and null */
mp3_state *source_mp3 = source->format->_state;
/* make sure the url data does not disappear from under us */
thread_mutex_lock (&source_mp3->url_lock);
/* work out message length */
if (source_mp3->url_artist)
len += strlen (source_mp3->url_artist);
if (source_mp3->url_title)
len += strlen (source_mp3->url_title);
if (source_mp3->url_artist && source_mp3->url_title)
len += 3;
#define MAX_META_LEN 255*16
if (len > MAX_META_LEN)
{
thread_mutex_unlock (&source_mp3->url_lock);
WARN1 ("Metadata too long at %d chars", len);
return;
}
/* work out the metadata len byte */
len_byte = (len-1) / 16 + 1;
/* now we know how much space to allocate, +1 for the len byte */
size = len_byte * 16 + 1;
p = refbuf_new (size);
if (p)
{
mp3_state *source_mp3 = source->format->_state;
memset (p->data, '\0', size);
if (source_mp3->url_artist && source_mp3->url_title)
snprintf (p->data, size, "%c%s%s - %s';", len_byte, meta,
source_mp3->url_artist, source_mp3->url_title);
else
snprintf (p->data, size, "%c%s%s';", len_byte, meta,
source_mp3->url_title);
filter_shoutcast_metadata (source, p->data, size);
refbuf_release (source_mp3->metadata);
source_mp3->metadata = p;
}
thread_mutex_unlock (&source_mp3->url_lock);
}
/* read mp3 data with inlined metadata from the source. Filter out the
* metadata so that the mp3 data itself is store on the queue and the
* metadata is is associated with it
*/
static refbuf_t *mp3_get_filter_meta (source_t *source)
{
refbuf_t *refbuf;
format_plugin_t *plugin = source->format;
mp3_state *source_mp3 = plugin->_state;
unsigned char *src;
unsigned int bytes, mp3_block;
if (complete_read (source) == 0)
return NULL;
refbuf = source_mp3->read_data;
source_mp3->read_data = NULL;
src = (unsigned char *)refbuf->data;
if (source_mp3->update_metadata)
{
mp3_set_title (source);
source_mp3->update_metadata = 0;
}
/* fill the buffer with the read data */
bytes = source_mp3->read_count;
refbuf->len = 0;
while (bytes > 0)
{
unsigned int metadata_remaining;
mp3_block = source_mp3->inline_metadata_interval - source_mp3->offset;
/* is there only enough to account for mp3 data */
if (bytes <= mp3_block)
{
refbuf->len += bytes;
source_mp3->offset += bytes;
break;
}
/* we have enough data to get to the metadata
* block, but only transfer upto it */
if (mp3_block)
{
src += mp3_block;
bytes -= mp3_block;
refbuf->len += mp3_block;
source_mp3->offset += mp3_block;
continue;
}
/* process the inline metadata, len == 0 indicates not seen any yet */
if (source_mp3->build_metadata_len == 0)
{
memset (source_mp3->build_metadata, 0,
sizeof (source_mp3->build_metadata));
source_mp3->build_metadata_offset = 0;
source_mp3->build_metadata_len = 1 + (*src * 16);
}
/* do we have all of the metatdata block */
metadata_remaining = source_mp3->build_metadata_len -
source_mp3->build_metadata_offset;
if (bytes < metadata_remaining)
{
memcpy (source_mp3->build_metadata +
source_mp3->build_metadata_offset, src, bytes);
source_mp3->build_metadata_offset += bytes;
break;
}
/* copy all bytes except the last one, that way we
* know a null byte terminates the message */
memcpy (source_mp3->build_metadata + source_mp3->build_metadata_offset,
src, metadata_remaining-1);
/* overwrite metadata in the buffer */
bytes -= metadata_remaining;
memmove (src, src+metadata_remaining, bytes);
/* assign metadata if it's greater than 1 byte, and the text has changed */
if (source_mp3->build_metadata_len > 1 &&
strcmp (source_mp3->build_metadata+1, source_mp3->metadata->data+1) != 0)
{
refbuf_t *meta = refbuf_new (source_mp3->build_metadata_len);
memcpy (meta->data, source_mp3->build_metadata,
source_mp3->build_metadata_len);
ICECAST_LOG_DEBUG("shoutcast metadata %.*s", 4080, meta->data+1);
if (strncmp (meta->data+1, "StreamTitle=", 12) == 0)
{
filter_shoutcast_metadata (source, source_mp3->build_metadata,
source_mp3->build_metadata_len);
refbuf_release (source_mp3->metadata);
source_mp3->metadata = meta;
source_mp3->inline_url = strstr (meta->data+1, "StreamUrl='");
}
else
{
ICECAST_LOG_ERROR("Incorrect metadata format, ending stream");
source->running = 0;
refbuf_release (refbuf);
refbuf_release (meta);
return NULL;
}
}
source_mp3->offset = 0;
source_mp3->build_metadata_len = 0;
}
/* the data we have just read may of just been metadata */
if (refbuf->len == 0)
{
refbuf_release (refbuf);
return NULL;
}
refbuf->associated = source_mp3->metadata;
refbuf_addref (source_mp3->metadata);
refbuf->sync_point = 1;
return refbuf;
}
/* called from the source thread when the metadata has been updated.
* The artist title are checked and made ready for clients to send
*/
static void mp3_set_title (source_t *source)
{
const char streamtitle[] = "StreamTitle='";
const char streamurl[] = "StreamUrl='";
size_t size;
unsigned char len_byte;
refbuf_t *p;
unsigned int len = sizeof(streamtitle) + 2; /* the StreamTitle, quotes, ; and null */
mp3_state *source_mp3 = source->format->_state;
/* make sure the url data does not disappear from under us */
thread_mutex_lock (&source_mp3->url_lock);
/* work out message length */
if (source_mp3->url_artist)
len += strlen (source_mp3->url_artist);
if (source_mp3->url_title)
len += strlen (source_mp3->url_title);
if (source_mp3->url_artist && source_mp3->url_title)
len += 3;
if (source_mp3->inline_url)
{
char *end = strstr (source_mp3->inline_url, "';");
if (end)
len += end - source_mp3->inline_url+2;
}
else if (source_mp3->url)
len += strlen (source_mp3->url) + strlen (streamurl) + 2;
#define MAX_META_LEN 255*16
if (len > MAX_META_LEN)
{
thread_mutex_unlock (&source_mp3->url_lock);
ICECAST_LOG_WARN("Metadata too long at %d chars", len);
return;
}
/* work out the metadata len byte */
len_byte = (len-1) / 16 + 1;
/* now we know how much space to allocate, +1 for the len byte */
size = len_byte * 16 + 1;
p = refbuf_new (size);
if (p)
{
mp3_state *source_mp3 = source->format->_state;
int r;
memset (p->data, '\0', size);
if (source_mp3->url_artist && source_mp3->url_title)
r = snprintf (p->data, size, "%c%s%s - %s';", len_byte, streamtitle,
source_mp3->url_artist, source_mp3->url_title);
else
r = snprintf (p->data, size, "%c%s%s';", len_byte, streamtitle,
source_mp3->url_title);
if (r > 0)
{
if (source_mp3->inline_url)
{
char *end = strstr (source_mp3->inline_url, "';");
ssize_t urllen = size;
if (end) urllen = end - source_mp3->inline_url + 2;
if ((ssize_t)(size-r) > urllen)
snprintf (p->data+r, size-r, "StreamUrl='%s';", source_mp3->inline_url+11);
}
else if (source_mp3->url)
snprintf (p->data+r, size-r, "StreamUrl='%s';", source_mp3->url);
}
ICECAST_LOG_DEBUG("shoutcast metadata block setup with %s", p->data+1);
filter_shoutcast_metadata (source, p->data, size);
refbuf_release (source_mp3->metadata);
source_mp3->metadata = p;
}
thread_mutex_unlock (&source_mp3->url_lock);
}
