/[svn]/libgig/trunk/src/gig.h

Diff of /libgig/trunk/src/gig.h

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-revision 2639 by schoenebeck,
Mon Jun 16 13:22:50 2014 UTC
+revision 2762 by schoenebeck,
Sat May  2 11:32:27 2015 UTC
 Line 2
   *                                                                         *
   *   libgig - C++ cross-platform Gigasampler format file access library    *
   *                                                                         *
-  *   Copyright (C) 2003-2014 by Christian Schoenebeck                      *
+  *   Copyright (C) 2003-2015 by Christian Schoenebeck                      *
   *                              <cuse@users.sourceforge.net>               *
   *                                                                         *
   *   This library is free software; you can redistribute it and/or modify  *
 Line 65
  # define CHUNK_ID_SCSL  0x4c534353 // own gig format extension
  #endif // WORDS_BIGENDIAN
- /** Gigasampler specific classes and definitions */
+ /** Gigasampler/GigaStudio specific classes and definitions */
  namespace gig {
      typedef std::string String;
+     typedef RIFF::progress_t progress_t;
      /** Lower and upper limit of a range. */
      struct range_t {
-Line 311 
 namespace gig {
+Line 312 
 namespace gig {
          unsigned long loop_cycles_left;  ///< How many times the loop has still to be passed, this value will be decremented with each loop cycle.
      };
-     /**
-      * @brief Used for indicating the progress of a certain task.
-      *
-      * The function pointer argument has to be supplied with a valid
-      * function of the given signature which will then be called on
-      * progress changes. An equivalent progress_t structure will be passed
-      * back as argument to the callback function on each progress change.
-      * The factor field of the supplied progress_t structure will then
-      * reflect the current progress as value between 0.0 and 1.0. You might
-      * want to use the custom field for data needed in your callback
-      * function.
-      */
-     struct progress_t {
-         void (*callback)(progress_t*); ///< Callback function pointer which has to be assigned to a function for progress notification.
-         float factor;                  ///< Reflects current progress as value between 0.0 and 1.0.
-         void* custom;                  ///< This pointer can be used for arbitrary data.
-         float __range_min;             ///< Only for internal usage, do not modify!
-         float __range_max;             ///< Only for internal usage, do not modify!
-         progress_t();
-     };
      // just symbol prototyping
      class File;
      class Instrument;
-Line 341 
 namespace gig {
+Line 321 
 namespace gig {
      class Script;
      class ScriptGroup;
-     /** @brief Encapsulates articulation information of a dimension region.
+     /** @brief Encapsulates articulation informations of a dimension region.
+      *
+      * This is the most important data object of the Gigasampler / GigaStudio
+      * format. A DimensionRegion provides the link to the sample to be played
+      * and all required articulation informations to be interpreted for playing
+      * back the sample and processing it appropriately by the sampler software.
+      * Every Region of a Gigasampler Instrument has at least one dimension
+      * region (exactly then when the Region has no dimension defined). Many
+      * Regions though provide more than one DimensionRegion, which reflect
+      * different playing "cases". For example a different sample might be played
+      * if a certain pedal is pressed down, or if the note was triggered with
+      * different velocity.
+      *
+      * One instance of a DimensionRegion reflects exactly one particular case
+      * while playing an instrument (for instance "note between C3 and E3 was
+      * triggered AND note on velocity was between 20 and 42 AND modulation wheel
+      * controller is between 80 and 127). The DimensionRegion defines what to do
+      * under that one particular case, that is which sample to play back and how
+      * to play that sample back exactly and how to process it. So a
+      * DimensionRegion object is always linked to exactly one sample. It may
+      * however also link to no sample at all, for defining a "silence" case
+      * where nothing shall be played (for example when note on velocity was
+      * below 6).
       *
-      *  Every Gigasampler Instrument has at least one dimension region
+      * Note that a DimensionRegion object only defines "what to do", but it does
-      *  (exactly then when it has no dimension defined).
+      * not define "when to do it". To actually resolve which DimensionRegion to
+      * pick under which situation, you need to refer to the DimensionRegions'
+      * parent Region object. The Region object contains the necessary
+      * "Dimension" definitions, which in turn define which DimensionRegion is
+      * associated with which playing case exactly.
       *
-      *  Gigasampler provides three Envelope Generators and Low Frequency
+      * The Gigasampler/GigaStudio format defines 3 Envelope Generators and 3
-      *  Oscillators:
+      * Low Frequency Oscillators:
       *
       *  - EG1 and LFO1, both controlling sample amplitude
       *  - EG2 and LFO2, both controlling filter cutoff frequency
       *  - EG3 and LFO3, both controlling sample pitch
+      *
+      * Since the gig format was designed as extension to the DLS file format,
+      * this class is derived from the DLS::Sampler class. So also refer to
+      * DLS::Sampler for additional informations, class attributes and methods.
       */
      class DimensionRegion : protected DLS::Sampler {
          public:
-Line 467 
 namespace gig {
+Line 477 
 namespace gig {
              using DLS::Sampler::DeleteSampleLoop;
              // overridden methods
              virtual void SetGain(int32_t gain);
-             virtual void UpdateChunks();
+             virtual void UpdateChunks(progress_t* pProgress);
              virtual void CopyAssign(const DimensionRegion* orig);
          protected:
              uint8_t* VelocityTable; ///< For velocity dimensions with custom defined zone ranges only: used for fast converting from velocity MIDI value to dimension bit number.
-Line 593 
 namespace gig {
+Line 603 
 namespace gig {
              double* CreateVelocityTable(curve_type_t curveType, uint8_t depth, uint8_t scaling);
      };
-     /** @brief Encapsulates sample waves used for playback.
+     /** @brief Encapsulates sample waves of Gigasampler/GigaStudio files used for playback.
+      *
+      * This class provides access to the actual audio sample data of a
+      * Gigasampler/GigaStudio file. Along to the actual sample data, it also
+      * provides access to the sample's meta informations like bit depth,
+      * sample rate, encoding type, but also loop informations. The latter may be
+      * used by instruments for resembling sounds with arbitary note lengths.
       *
       * In case you created a new sample with File::AddSample(), you should
       * first update all attributes with the desired meta informations
-Line 607 
 namespace gig {
+Line 623 
 namespace gig {
       * retrieved from the respective DimensionRegon instead from the Sample
       * itself. This was made for allowing different loop definitions for the
       * same sample under different conditions.
+      *
+      * Since the gig format was designed as extension to the DLS file format,
+      * this class is derived from the DLS::Sample class. So also refer to
+      * DLS::Sample for additional informations, class attributes and methods.
       */
      class Sample : public DLS::Sample {
          public:
-Line 647 
 namespace gig {
+Line 667 
 namespace gig {
              unsigned long ReadAndLoop(void* pBuffer, unsigned long SampleCount, playback_state_t* pPlaybackState, DimensionRegion* pDimRgn, buffer_t* pExternalDecompressionBuffer = NULL);
              unsigned long Write(void* pBuffer, unsigned long SampleCount);
              Group*        GetGroup() const;
-             virtual void  UpdateChunks();
+             virtual void  UpdateChunks(progress_t* pProgress);
              void CopyAssignMeta(const Sample* orig);
              void CopyAssignWave(const Sample* orig);
          protected:
-Line 698 
 namespace gig {
+Line 718 
 namespace gig {
      };
      // TODO: <3dnl> list not used yet - not important though (just contains optional descriptions for the dimensions)
-     /** @brief Defines Region information of an Instrument.
+     /** @brief Defines Region information of a Gigasampler/GigaStudio instrument.
       *
-      * A Region reflects a consecutive area on the keyboard. The individual
+      * A Region reflects a consecutive area (key range) on the keyboard. The
-      * regions in the gig format may not overlap with other regions (of the same
+      * individual regions in the gig format may not overlap with other regions
-      * instrument). Further, in the gig format a Region is merely a container
+      * (of the same instrument that is). Further, in the gig format a Region is
-      * for DimensionRegions (a.k.a. "Cases"). The Region itself does not provide
+      * merely a container for DimensionRegions (a.k.a. "Cases"). The Region
-      * the sample mapping or articulation informations used, even though the
+      * itself does not provide the sample mapping or articulation informations
-      * data structures indeed provide such informations. The latter is however
+      * used, even though the data structures of regions indeed provide such
-      * just of historical nature, because the gig format was derived from the
+      * informations. The latter is however just of historical nature, because
-      * DLS format.
+      * the gig file format was derived from the DLS file format.
       *
       * Each Region consists of at least one or more DimensionRegions. The actual
       * amount of DimensionRegions depends on which kind of "dimensions" are
       * defined for this region, and on the split / zone amount for each of those
       * dimensions.
+      *
+      * Since the gig format was designed as extension to the DLS file format,
+      * this class is derived from the DLS::Region class. So also refer to
+      * DLS::Region for additional informations, class attributes and methods.
       */
      class Region : public DLS::Region {
          public:
-Line 735 
 namespace gig {
+Line 759 
 namespace gig {
              void             SetDimensionType(dimension_t oldType, dimension_t newType);
              // overridden methods
              virtual void     SetKeyRange(uint16_t Low, uint16_t High);
-             virtual void     UpdateChunks();
+             virtual void     UpdateChunks(progress_t* pProgress);
              virtual void     CopyAssign(const Region* orig);
          protected:
              Region(Instrument* pInstrument, RIFF::List* rgnList);
-Line 748 
 namespace gig {
+Line 772 
 namespace gig {
              friend class Instrument;
      };
-     /** Abstract base class for all MIDI rules. */
+     /** @brief Abstract base class for all MIDI rules.
+      *
+      * Note: Instead of using MIDI rules, we recommend you using real-time
+      * instrument scripts instead. Read about the reasons below.
+      *
+      * MIDI Rules (also called "iMIDI rules" or "intelligent MIDI rules") were
+      * introduced with GigaStudio 4 as an attempt to increase the power of
+      * potential user controls over sounds. At that point other samplers already
+      * supported certain powerful user control features, which were not possible
+      * with GigaStudio yet. For example triggering new notes by MIDI CC
+      * controller.
+      *
+      * Such extended features however were usually implemented by other samplers
+      * by requiring the sound designer to write an instrument script which the
+      * designer would then bundle with the respective instrument file. Such
+      * scripts are essentially text files, using a very specific programming
+      * language for the purpose of controlling the sampler in real-time. Since
+      * however musicians are not typically keen to writing such cumbersome
+      * script files, the GigaStudio designers decided to implement such extended
+      * features completely without instrument scripts. Instead they created a
+      * set of rules, which could be defined and altered conveniently by mouse
+      * clicks in GSt's instrument editor application. The downside of this
+      * overall approach however, was that those MIDI rules were very limited in
+      * practice. As sound designer you easily came across the possiblities such
+      * MIDI rules were able to offer.
+      *
+      * Due to such severe use case constraints, support for MIDI rules is quite
+      * limited in libgig. At the moment only the "Control Trigger", "Alternator"
+      * and the "Legato" MIDI rules are supported by libgig. Consequently the
+      * graphical instrument editor application gigedit just supports the
+      * "Control Trigger" and "Legato" MIDI rules, and LinuxSampler even does not
+      * support any MIDI rule type at all and LinuxSampler probably will not
+      * support MIDI rules in future either.
+      *
+      * Instead of using MIDI rules, we introduced real-time instrument scripts
+      * as extension to the original GigaStudio file format. This script based
+      * solution is much more powerful than MIDI rules and is already supported
+      * by libgig, gigedit and LinuxSampler.
+      *
+      * @deprecated Just provided for backward compatiblity, use Script for new
+      *             instruments instead.
+      */
      class MidiRule {
          public:
              virtual ~MidiRule() { }
-Line 757 
 namespace gig {
+Line 822 
 namespace gig {
              friend class Instrument;
      };
-     /** MIDI rule for triggering notes by control change events. */
+     /** @brief MIDI rule for triggering notes by control change events.
+      *
+      * A "Control Trigger MIDI rule" allows to trigger new notes by sending MIDI
+      * control change events to the sampler.
+      *
+      * Note: "Control Trigger" MIDI rules are only supported by gigedit, but not
+      * by LinuxSampler. We recommend you using real-time instrument scripts
+      * instead. Read more about the details and reasons for this in the
+      * description of the MidiRule base class.
+      *
+      * @deprecated Just provided for backward compatiblity, use Script for new
+      *             instruments instead. See description of MidiRule for details.
+      */
      class MidiRuleCtrlTrigger : public MidiRule {
          public:
              uint8_t ControllerNumber;   ///< MIDI controller number.
-Line 779 
 namespace gig {
+Line 856 
 namespace gig {
              friend class Instrument;
      };
-     /** MIDI rule for instruments with legato samples. */
+     /** @brief MIDI rule for instruments with legato samples.
+      *
+      * A "Legato MIDI rule" allows playing instruments resembling the legato
+      * playing technique. In the past such legato articulations were tried to be
+      * simulated by pitching the samples of the instrument. However since
+      * usually a high amount of pitch is needed for legatos, this always sounded
+      * very artificial and unrealistic. The "Legato MIDI rule" thus uses another
+      * approach. Instead of pitching the samples, it allows the sound designer
+      * to bundle separate, additional samples for the individual legato
+      * situations and the legato rules defined which samples to be played in
+      * which situation.
+      *
+      * Note: "Legato MIDI rules" are only supported by gigedit, but not
+      * by LinuxSampler. We recommend you using real-time instrument scripts
+      * instead. Read more about the details and reasons for this in the
+      * description of the MidiRule base class.
+      *
+      * @deprecated Just provided for backward compatiblity, use Script for new
+      *             instruments instead. See description of MidiRule for details.
+      */
      class MidiRuleLegato : public MidiRule {
          public:
              uint8_t LegatoSamples;     ///< Number of legato samples per key in each direction (always 12)
-Line 800 
 namespace gig {
+Line 896 
 namespace gig {
              friend class Instrument;
      };
-     /** MIDI rule to automatically cycle through specified sequences of different articulations. The instrument must be using the smartmidi dimension. */
+     /** @brief MIDI rule to automatically cycle through specified sequences of different articulations.
+      *
+      * The instrument must be using the smartmidi dimension.
+      *
+      * Note: "Alternator" MIDI rules are neither supported by gigedit nor by
+      * LinuxSampler. We recommend you using real-time instrument scripts
+      * instead. Read more about the details and reasons for this in the
+      * description of the MidiRule base class.
+      *
+      * @deprecated Just provided for backward compatiblity, use Script for new
+      *             instruments instead. See description of MidiRule for details.
+      */
      class MidiRuleAlternator : public MidiRule {
          public:
              uint8_t Articulations;     ///< Number of articulations in the instrument
-Line 841 
 namespace gig {
+Line 948 
 namespace gig {
              friend class Instrument;
      };
-     /** A MIDI rule not yet implemented by libgig. */
+     /** @brief A MIDI rule not yet implemented by libgig.
+      *
+      * This class is currently used as a place holder by libgig for MIDI rule
+      * types which are not supported by libgig yet.
+      *
+      * Note: Support for missing MIDI rule types are probably never added to
+      * libgig. We recommend you using real-time instrument scripts instead.
+      * Read more about the details and reasons for this in the description of
+      * the MidiRule base class.
+      *
+      * @deprecated Just provided for backward compatiblity, use Script for new
+      *             instruments instead. See description of MidiRule for details.
+      */
      class MidiRuleUnknown : public MidiRule {
          protected:
              MidiRuleUnknown() { }
-Line 858 
 namespace gig {
+Line 977 
 namespace gig {
       *
       * This is an extension of the GigaStudio format, thus a feature which was
       * not available in the GigaStudio 4 software. It is currently only
-      * supported by LinuxSampler and gigedit.
+      * supported by LinuxSampler and gigedit. Scripts will not load with the
+      * original GigaStudio software.
+      *
+      * You find more informations about Instrument Scripts on the LinuxSampler
+      * documentation site:
+      *
+      * - <a href="http://doc.linuxsampler.org/Instrument_Scripts/">About Instrument Scripts in General</a>
+      * - <a href="http://doc.linuxsampler.org/Instrument_Scripts/NKSP_Language">Introduction to the NKSP Script Language</a>
+      * - <a href="http://doc.linuxsampler.org/Instrument_Scripts/NKSP_Language/Reference/">NKSP Reference Manual</a>
+      * - <a href="http://doc.linuxsampler.org/Gigedit/Managing_Scripts">Using Instrument Scripts with Gigedit</a>
       */
      class Script {
          public:
-Line 869 
 namespace gig {
+Line 997 
 namespace gig {
                  COMPRESSION_NONE = 0 ///< Is not compressed at all (default).
              };
              enum Language_t {
-                 LANGUAGE_NKSP = 0 ///< NKSP stands for "Is Not KSP" (default).
+                 LANGUAGE_NKSP = 0 ///< NKSP stands for "Is Not KSP" (default). Refer to the <a href="http://doc.linuxsampler.org/Instrument_Scripts/NKSP_Language/Reference/">NKSP Reference Manual</a> for details about this script language.
              };
              String         Name;        ///< Arbitrary name of the script, which may be displayed i.e. in an instrument editor.
-Line 885 
 namespace gig {
+Line 1013 
 namespace gig {
          protected:
              Script(ScriptGroup* group, RIFF::Chunk* ckScri);
              virtual ~Script();
-             void UpdateChunks();
+             void UpdateChunks(progress_t* pProgress);
              void RemoveAllScriptReferences();
              friend class ScriptGroup;
              friend class Instrument;
-Line 918 
 namespace gig {
+Line 1046 
 namespace gig {
              ScriptGroup(File* file, RIFF::List* lstRTIS);
              virtual ~ScriptGroup();
              void LoadScripts();
-             void UpdateChunks();
+             void UpdateChunks(progress_t* pProgress);
              friend class Script;
              friend class File;
          private:
-Line 927 
 namespace gig {
+Line 1055 
 namespace gig {
              std::list<Script*>*  pScripts;
      };
-     /** Provides all neccessary information for the synthesis of an <i>Instrument</i>. */
+     /** @brief Provides access to a Gigasampler/GigaStudio instrument.
+      *
+      * This class provides access to Gigasampler/GigaStudio instruments
+      * contained in .gig files. A gig instrument is merely a set of keyboard
+      * ranges (called Region), plus some additional global informations about
+      * the instrument. The major part of the actual instrument definition used
+      * for the synthesis of the instrument is contained in the respective Region
+      * object (or actually in the respective DimensionRegion object being, see
+      * description of Region for details).
+      *
+      * Since the gig format was designed as extension to the DLS file format,
+      * this class is derived from the DLS::Instrument class. So also refer to
+      * DLS::Instrument for additional informations, class attributes and
+      * methods.
+      */
      class Instrument : protected DLS::Instrument {
          public:
              // derived attributes from DLS::Resource
-Line 956 
 namespace gig {
+Line 1098 
 namespace gig {
              Region*   GetNextRegion();
              Region*   AddRegion();
              void      DeleteRegion(Region* pRegion);
-             virtual void UpdateChunks();
+             void      MoveTo(Instrument* dst);
+             virtual void UpdateChunks(progress_t* pProgress);
              virtual void CopyAssign(const Instrument* orig);
              // own methods
              Region*   GetRegion(unsigned int Key);
-Line 999 
 namespace gig {
+Line 1142 
 namespace gig {
              std::vector<_ScriptPooolRef>* pScriptRefs;
      };
-     /** @brief Group of Gigasampler objects
+     /** @brief Group of Gigasampler samples
       *
-      * Groups help to organize a huge collection of Gigasampler objects.
+      * Groups help to organize a huge collection of Gigasampler samples.
       * Groups are not concerned at all for the synthesis, but they help
       * sound library developers when working on complex instruments with an
       * instrument editor (as long as that instrument editor supports it ;-).
       *
-      * At the moment, it seems as only samples can be grouped together in
-      * the Gigasampler format yet. If this is false in the meantime, please
-      * tell us !
-      *
       * A sample is always assigned to exactly one Group. This also means
       * there is always at least one Group in a .gig file, no matter if you
       * created one yet or not.
-Line 1024 
 namespace gig {
+Line 1163 
 namespace gig {
          protected:
              Group(File* file, RIFF::Chunk* ck3gnm);
              virtual ~Group();
-             virtual void UpdateChunks();
+             virtual void UpdateChunks(progress_t* pProgress);
              void MoveAll();
              friend class File;
          private:
-Line 1032 
 namespace gig {
+Line 1171 
 namespace gig {
              RIFF::Chunk* pNameChunk; ///< '3gnm' chunk
      };
-     /** Parses Gigasampler files and provides abstract access to the data. */
+     /** @brief Provides convenient access to Gigasampler/GigaStudio .gig files.
+      *
+      * This is the entry class for accesing a Gigasampler/GigaStudio (.gig) file
+      * with libgig. It allows you to open existing .gig files, modifying them
+      * and saving them persistently either under the same file name or under a
+      * different location.
+      *
+      * A .gig file is merely a monolithic file. That means samples and the
+      * defintion of the virtual instruments are contained in the same file. A
+      * .gig file contains an arbitrary amount of samples, and an arbitrary
+      * amount of instruments which are referencing those samples. It is also
+      * possible to store samples in .gig files not being referenced by any
+      * instrument. This is not an error from the file format's point of view and
+      * it is actually often used in practice during the design phase of new gig
+      * instruments.
+      *
+      * So on toplevel of the gig file format you have:
+      *
+      * - A set of samples (see Sample).
+      * - A set of virtual instruments (see Instrument).
+      *
+      * And as extension to the original GigaStudio format, we added:
+      *
+      * - Real-time instrument scripts (see Script).
+      *
+      * Note that the latter however is only supported by libgig, gigedit and
+      * LinuxSampler. Scripts are not supported by the original GigaStudio
+      * software.
+      *
+      * All released Gigasampler/GigaStudio file format versions are supported
+      * (so from first Gigasampler version up to including GigaStudio 4).
+      *
+      * Since the gig format was designed as extension to the DLS file format,
+      * this class is derived from the DLS::File class. So also refer to
+      * DLS::File for additional informations, class attributes and methods.
+      */
      class File : protected DLS::File {
          public:
              static const DLS::version_t VERSION_2;
-Line 1080 
 namespace gig {
+Line 1254 
 namespace gig {
              ScriptGroup* AddScriptGroup();
              void        DeleteScriptGroup(ScriptGroup* pGroup);
              virtual    ~File();
-             virtual void UpdateChunks();
+             virtual void UpdateChunks(progress_t* pProgress);
          protected:
              // overridden protected methods from DLS::File
              virtual void LoadSamples();
-Line 1094 
 namespace gig {
+Line 1268 
 namespace gig {
              void SetSampleChecksum(Sample* pSample, uint32_t crc);
              friend class Region;
              friend class Sample;
+             friend class Instrument;
              friend class Group; // so Group can access protected member pRIFF
              friend class ScriptGroup; // so ScriptGroup can access protected member pRIFF
          private:

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+Added in v.2762

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