bool
FLACInputStream::initialize(FilePtr file) {
m_file = file;
// initialize the decoder
m_decoder = FLAC__seekable_stream_decoder_new();
if (!m_decoder) {
m_file = 0;
return false;
}
#define SET_CALLBACK(name) \
FLAC__seekable_stream_decoder_set_##name##_callback( \
m_decoder, \
name##_callback)
// set callbacks
FLAC__seekable_stream_decoder_set_client_data (m_decoder, this);
SET_CALLBACK(read);
SET_CALLBACK(seek);
SET_CALLBACK(tell);
SET_CALLBACK(length);
SET_CALLBACK(eof);
SET_CALLBACK(write);
SET_CALLBACK(metadata);
SET_CALLBACK(error);
FLAC__SeekableStreamDecoderState state =
FLAC__seekable_stream_decoder_init(m_decoder);
if (state != FLAC__SEEKABLE_STREAM_DECODER_OK) {
FLAC__seekable_stream_decoder_finish(m_decoder);
FLAC__seekable_stream_decoder_delete(m_decoder);
m_decoder = 0;
m_file = 0;
return false;
}
// make sure we have metadata before we return!
if (!FLAC__seekable_stream_decoder_process_until_end_of_metadata(m_decoder)) {
FLAC__seekable_stream_decoder_finish(m_decoder);
FLAC__seekable_stream_decoder_delete(m_decoder);
m_decoder = 0;
m_file = 0;
return false;
}
// process one frame so we can do something!
if (!FLAC__seekable_stream_decoder_process_single(m_decoder)) {
FLAC__seekable_stream_decoder_finish(m_decoder);
FLAC__seekable_stream_decoder_delete(m_decoder);
m_decoder = 0;
m_file = 0;
return false;
}
// get info about the flac file
m_channel_count = FLAC__seekable_stream_decoder_get_channels(m_decoder);
m_sample_rate = FLAC__seekable_stream_decoder_get_sample_rate(m_decoder);
int bps = FLAC__seekable_stream_decoder_get_bits_per_sample(m_decoder);
if (bps == 16) {
m_sample_format = SF_S16;
} else if (bps == 8) {
m_sample_format = SF_U8;
} else {
return false;
}
return true;
}
unsigned FLAC__file_decoder_get_sample_rate(const FLAC__FileDecoder *decoder)
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->private_);
return FLAC__seekable_stream_decoder_get_sample_rate(decoder->private_->seekable_stream_decoder);
}
