/* Attempts to read an ID3 tag at the current location in stream and
* consume it all. Returns -1 if no tag is found. Its up to caller
* to recover. */
static int mp3_inputtag(snd_stream_t *stream)
{
mp3_priv_t *p = (mp3_priv_t *) stream->priv;
int rc = -1;
size_t remaining;
size_t tagsize;
/* FIXME: This needs some more work if we are to ever
* look at the ID3 frame. This is because the Stream
* may not be able to hold the complete ID3 frame.
* We should consume the whole frame inside tagtype()
* instead of outside of tagframe(). That would support
* recovering when Stream contains less then 8-bytes (header)
* and also when ID3v2 is bigger then Stream buffer size.
* Need to pass in stream so that buffer can be
* consumed as well as letting additional data to be
* read in.
*/
remaining = p->Stream.bufend - p->Stream.next_frame;
tagsize = mp3_tagsize(p->Stream.this_frame, remaining);
if (tagsize != 0)
{
mad_stream_skip(&p->Stream, tagsize);
rc = 0;
}
/* We know that a valid frame hasn't been found yet
* so help libmad out and go back into frame seek mode.
* This is true whether an ID3 tag was found or not.
*/
mad_stream_sync(&p->Stream);
return rc;
}
// Attempts to read an ID3 tag at the current location in stream and
// consume it all. Returns SOX_EOF if no tag is found. Its up to
// caller to recover.
// Returns true if a tag was found and consumed.
//
bool MadDecoder::consumeId3Tag()
{
// FIXME: This needs some more work if we are to ever
// look at the ID3 frame. This is because the Stream
// may not be able to hold the complete ID3 frame.
// We should consume the whole frame inside getId3TagSize()
// instead of outside of tagframe(). That would support
// recovering when Stream contains less then 8-bytes (header)
// and also when ID3v2 is bigger then Stream buffer size.
// Need to pass in stream so that buffer can be
// consumed as well as letting additional data to be
// read in.
//
bool result = false;
size_t leftover = madStream_.bufend - madStream_.next_frame;
size_t tagsize = getId3TagSize(madStream_.this_frame, leftover);
if (tagsize > 0)
{
mad_stream_skip(&madStream_, tagsize);
result = true;
}
/* We know that a valid frame hasn't been found yet
* so help libmad out and go back into frame seek mode.
* This is true whether an ID3 tag was found or not.
*/
mad_stream_sync(&madStream_);
return result;
}
