/**
* This reads the current data and interprets it as an "stream bitrate properties" chunk. <br>
*
* @param raf Input source
* @param candidate Chunk which possibly contains encoding data.
* @return StreamBitratePropertiesChunk, <code>null</code> if its not a valid one. <br>
* @throws IOException read errors.
*/
public static StreamBitratePropertiesChunk read(RandomAccessFile raf, Chunk candidate)
throws IOException {
if (raf == null || candidate == null) {
throw new IllegalArgumentException("Arguments must not be null.");
}
if (GUID.GUID_STREAM_BITRATE_PROPERTIES.equals(candidate.getGuid())) {
raf.seek(candidate.getPosition());
return new StreamBitratePropertiesReader().parseData(raf);
}
return null;
}
/**
* see {@link #read(RandomAccessFile, Chunk)}
*
* @param raf input source.
* @return StreamBitratePropertiesChunk, <code>null</code> if its not a valid one. <br>
* @throws IOException read errors.
*/
private StreamBitratePropertiesChunk parseData(RandomAccessFile raf) throws IOException {
StreamBitratePropertiesChunk result = null;
long chunkStart = raf.getFilePointer();
GUID guid = Utils.readGUID(raf);
if (GUID.GUID_STREAM_BITRATE_PROPERTIES.equals(guid)) {
BigInteger chunkLen = Utils.readBig64(raf);
result = new StreamBitratePropertiesChunk(chunkStart, chunkLen);
/*
* Read the amount of bitrate records
*/
long recordCount = Utils.readUINT16(raf);
for (int i = 0; i < recordCount; i++) {
int flags = Utils.readUINT16(raf);
long avgBitrate = Utils.readUINT32(raf);
result.addBitrateRecord(flags & 0x00FF, avgBitrate);
}
}
return result;
}
