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/*
* Copyright 2010 Phil Burk, Mobileer Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.jsyn.data;
import com.jsyn.unitgen.FixedRateMonoReader;
import com.jsyn.unitgen.FixedRateMonoWriter;
import com.jsyn.unitgen.FixedRateStereoReader;
import com.jsyn.unitgen.FixedRateStereoWriter;
import com.jsyn.unitgen.VariableRateMonoReader;
import com.jsyn.unitgen.VariableRateStereoReader;
/**
* Interface for objects that can be read and/or written by index. The index is not stored
* internally so they can be shared by multiple readers.
*
* @author Phil Burk (C) 2010 Mobileer Inc
* @see FixedRateMonoReader
* @see FixedRateStereoReader
* @see FixedRateMonoWriter
* @see FixedRateStereoWriter
* @see VariableRateMonoReader
* @see VariableRateStereoReader
*/
public interface SequentialData {
/**
* Write a value at the given index.
*
* @param index sample index is ((frameIndex * channelsPerFrame) + channelIndex)
* @param value the value to be written
*/
void writeDouble(int index, double value);
/**
* Read a value from the sample independently from the internal storage format.
*
* @param index sample index is ((frameIndex * channelsPerFrame) + channelIndex)
*/
double readDouble(int index);
/***
* @return Beginning of sustain loop or -1 if no loop.
*/
public int getSustainBegin();
/**
* SustainEnd value is the frame index of the frame just past the end of the loop. The number of
* frames included in the loop is (SustainEnd - SustainBegin).
*
* @return End of sustain loop or -1 if no loop.
*/
public int getSustainEnd();
/***
* @return Beginning of release loop or -1 if no loop.
*/
public int getReleaseBegin();
/***
* @return End of release loop or -1 if no loop.
*/
public int getReleaseEnd();
/**
* Get rate to play the data. In an envelope this correspond to the inverse of the frame
* duration and would vary frame to frame. For an audio sample it is 1.0.
*
* @param index
* @param synthesisRate
* @return rate to scale the playback speed.
*/
double getRateScaler(int index, double synthesisRate);
/**
* @return For a stereo sample, return 2.
*/
int getChannelsPerFrame();
/**
* @return The number of valid frames that can be read.
*/
int getNumFrames();
}
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