musix 0.3.5

Music player library for esoteric audio formats (music from C64,Amiga etc)
Documentation 
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/*
 * modsmp_ctrl.h
 * -------------
 * Purpose: Basic sample editing code (resizing, adding silence, normalizing, ...).
 * Notes  : (currently none)
 * Authors: OpenMPT Devs
 * The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
 */


#pragma once

#include "BuildSettings.h"

OPENMPT_NAMESPACE_BEGIN
class CSoundFile;
struct ModSample;
struct ModChannel;
OPENMPT_NAMESPACE_END

#include "Snd_defs.h"

OPENMPT_NAMESPACE_BEGIN

namespace ctrlSmp
{

enum ResetFlag
{
	SmpResetCompo = 1,
	SmpResetInit,
	SmpResetVibrato,
};

// Insert silence to given location.
// Note: Is currently implemented only for inserting silence to the beginning and to the end of the sample.
// Return: Length of the new sample.
SmpLength InsertSilence(ModSample &smp, const SmpLength silenceLength, const SmpLength startFrom, CSoundFile &sndFile);

// Remove part of a sample [selStart, selEnd[.
// Note: Removed memory is not freed.
// Return: Length of the new sample.
SmpLength RemoveRange(ModSample &smp, SmpLength selStart, SmpLength selEnd, CSoundFile &sndFile);

// Change sample size.
// Note: If resized sample is bigger, silence will be added to the sample's tail.
// Return: Length of the new sample.
SmpLength ResizeSample(ModSample &smp, const SmpLength newLength, CSoundFile &sndFile);

// Replaces sample in 'smp' with given sample and frees the old sample.
void ReplaceSample(ModSample &smp, void *pNewSample,  const SmpLength newLength, CSoundFile &sndFile);

// Update loop wrap-around buffers
bool PrecomputeLoops(ModSample &smp, CSoundFile &sndFile, bool updateChannels = true);

// Propagate loop point changes to player
bool UpdateLoopPoints(const ModSample &smp, CSoundFile &sndFile);

// Resets samples.
void ResetSamples(CSoundFile &sndFile, ResetFlag resetflag, SAMPLEINDEX minSample = SAMPLEINDEX_INVALID, SAMPLEINDEX maxSample = SAMPLEINDEX_INVALID);

// Remove DC offset and normalize.
// Return: If DC offset was removed, returns original offset value, zero otherwise.
double RemoveDCOffset(ModSample &smp, SmpLength start, SmpLength end, CSoundFile &sndFile);

// Amplify / fade  sample data
bool AmplifySample(ModSample &smp, SmpLength start, SmpLength end, CSoundFile &sndFile, double amplifyStart, double amplifyEnd);

// Reverse sample data
bool ReverseSample(ModSample &smp, SmpLength start, SmpLength end, CSoundFile &sndFile);

// Virtually unsign sample data
bool UnsignSample(ModSample &smp, SmpLength start, SmpLength end, CSoundFile &sndFile);

// Invert sample data (flip by 180 degrees)
bool InvertSample(ModSample &smp, SmpLength start, SmpLength end, CSoundFile &sndFile);

// Crossfade sample data to create smooth loops
bool XFadeSample(ModSample &smp, SmpLength fadeLength, int fadeLaw, bool afterloopFade, bool useSustainLoop, CSoundFile &sndFile);

// Silence parts of the sample data
bool SilenceSample(ModSample &smp, SmpLength start, SmpLength end, CSoundFile &sndFile);

// Modify stereo separation of the sample data. separation is in range [-200, 200]
bool StereoSepSample(ModSample &smp, SmpLength start, SmpLength end, double separation, CSoundFile &sndFile);

enum StereoToMonoMode
{
	mixChannels,
	onlyLeft,
	onlyRight,
	splitSample,
};

// Convert a sample with any number of channels to mono
bool ConvertToMono(ModSample &smp, CSoundFile &sndFile, StereoToMonoMode conversionMode);

// Convert a mono sample to stereo
bool ConvertToStereo(ModSample &smp, CSoundFile &sndFile);

// Convert 16-bit sample to 8-bit
bool ConvertTo8Bit(ModSample &smp, CSoundFile &sndFile);

// Convert 8-bit sample to 16-bit
bool ConvertTo16Bit(ModSample &smp, CSoundFile &sndFile);

} // Namespace ctrlSmp

namespace ctrlChn
{

// Replaces sample from sound channels by given sample.
void ReplaceSample( CSoundFile &sndFile,
					const ModSample &sample,
					const void * const pNewSample,
					const SmpLength newLength,
					FlagSet<ChannelFlags> setFlags,
					FlagSet<ChannelFlags> resetFlags);

} // namespace ctrlChn


OPENMPT_NAMESPACE_END