/**
* Reads frames up to given limit. If called subsequently the method
* continues after the last frame read in the last call, again to read up
* to the limit or just the rest of the frames.
*
* @param integer $limit The maximum number of frames read from the
* bitstream
*/
private function _readFrames($limit = null)
{
if ($limit === null || $limit > 200) {
$limit = 200;
}
if ($this->_lastFrameOffset !== false) {
$this->_reader->setOffset($this->_lastFrameOffset);
}
for ($i = 0; ($j = $this->_reader->getOffset()) < $this->_bytes; $i++) {
$options = $this->getOptions();
$frame = new Zend_Media_Mpeg_Abs_Frame($this->_reader, $options);
$this->_cumulativePlayDuration += (double) ($frame->getLength() / ($frame->getBitrate() * 1000 / 8));
$this->_cumulativeBitrate += $frame->getBitrate();
$this->_frames[] = $frame;
if ($limit === null) {
$this->_lastFrameOffset = $this->_reader->getOffset();
}
if ($limit !== null && $i + 1 == $limit || $limit !== null && $j + $frame->getLength() >= $this->_bytes) {
$this->_lastFrameOffset = $this->_reader->getOffset();
break;
}
}
}
