/**
* Returns the next tag from the open file
*
* @throws FLV_CorruptedFileException
*
* @param array $skipTagTypes The tag types contained in this array won't be examined
* @return FLV_Tag_Generic or one of its descendants
*/
function getTag($skipTagTypes = false)
{
static $cnt = 0;
if ($this->eof) {
return null;
}
$hdr = fread($this->fp, self::TAG_HEADER_SIZE);
if (strlen($hdr) < self::TAG_HEADER_SIZE) {
$this->eof = true;
return null;
}
/*
//DEV: Some files seem to don't store this value!
// check against corrupted files
$prevTagSize = unpack( 'Nprev', $hdr );
if ($prevTagSize['prev'] != $this->lastTagSize)
{
throw(
new FLV_CorruptedFileException(
sprintf( "Previous tag size check failed. Actual size is %d but defined size is %d",
$this->lastTagSize,
$prevTagSize['prev']
)
)
);
}
*/
// Get the tag object by skiping the first 4 bytes which tell the previous tag size
$tag = FLV_Tag::getTag(substr($hdr, 4));
// Read at most MAX_TAG_BODY_SIZE bytes of the body
$bytesToRead = min(self::MAX_TAG_BODY_SIZE, $tag->size);
$tag->setBody(fread($this->fp, $bytesToRead));
// Check if the tag body has to be processed
if (is_array($skipTagTypes) && !in_array($tag->type, $skipTagTypes)) {
$tag->analyze();
}
// If the tag was skipped or the body size was larger than MAX_TAG_BODY_SIZE
if ($tag->size > $bytesToRead) {
fseek($this->fp, $tag->size - $bytesToRead, SEEK_CUR);
}
$this->lastTagSize = $tag->size + self::TAG_HEADER_SIZE - 4;
return $tag;
}
/**
* Returns the next tag from the open file
*
* @param array $skipTagTypes The tag types contained in this array won't be examined
*
* @return object FLV_Tag_Generic or one of its descendants
*/
function getTag($skipTagTypes = false)
{
if ($this->eof) {
return NULL;
}
$hdr = fread($this->_fh, $this->TAG_HEADER_SIZE);
if (strlen($hdr) < $this->TAG_HEADER_SIZE) {
$this->eof = true;
return NULL;
}
// check against corrupted files
$prevTagSize = unpack('Nprev', $hdr);
// if ($prevTagSize['prev'] != $this->_lastTagSize) die("<br>Previous tag size check failed. Actual size is ".$this->_lastTagSize." but defined size is ".$prevTagSize['prev']);
// Get the tag object by skiping the first 4 bytes which tell the previous tag size
$tag = FLV_Tag::getTag(substr($hdr, 4));
// Read at most MAX_TAG_BODY_SIZE bytes of the body
$bytesToRead = min($this->MAX_TAG_BODY_SIZE, $tag->size);
$tag->setBody(fread($this->_fh, $bytesToRead));
// Check if the tag body has to be processed
if (is_array($skipTagTypes) && !in_array($tag->type, $skipTagTypes) || !$skipTagTypes) {
$tag->analyze();
}
// If the tag was skipped or the body size was larger than MAX_TAG_BODY_SIZE
if ($tag->size > $bytesToRead) {
fseek($this->_fh, $tag->size - $bytesToRead, SEEK_CUR);
}
$this->_lastTagSize = $tag->size + $this->TAG_HEADER_SIZE - 4;
$tag->start = $this->getTagOffset();
$tag->end = ftell($this->_fh);
return $tag;
}
