/[svn]/libgig/trunk/src/gig.h
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revision 350 by schoenebeck, Tue Jan 25 21:54:24 2005 UTC revision 406 by persson, Wed Feb 23 19:11:07 2005 UTC
# Line 2  Line 2 
2   *                                                                         *   *                                                                         *
3   *   libgig - C++ cross-platform Gigasampler format file loader library    *   *   libgig - C++ cross-platform Gigasampler format file loader library    *
4   *                                                                         *   *                                                                         *
5   *   Copyright (C) 2003, 2004 by Christian Schoenebeck                     *   *   Copyright (C) 2003-2005 by Christian Schoenebeck                      *
6   *                               <cuse@users.sourceforge.net>              *   *                              <cuse@users.sourceforge.net>               *
7   *                                                                         *   *                                                                         *
8   *   This library is free software; you can redistribute it and/or modify  *   *   This library is free software; you can redistribute it and/or modify  *
9   *   it under the terms of the GNU General Public License as published by  *   *   it under the terms of the GNU General Public License as published by  *
# Line 80  namespace gig { Line 80  namespace gig {
80          void*         pStart;            ///< Points to the beginning of the buffer.          void*         pStart;            ///< Points to the beginning of the buffer.
81          unsigned long Size;              ///< Size of the actual data in the buffer in bytes.          unsigned long Size;              ///< Size of the actual data in the buffer in bytes.
82          unsigned long NullExtensionSize; ///< The buffer might be bigger than the actual data, if that's the case that unused space at the end of the buffer is filled with NULLs and NullExtensionSize reflects that unused buffer space in bytes. Those NULL extensions are mandatory for differential algorithms that have to take the following data words into account, thus have to access past the buffer's boundary. If you don't know what I'm talking about, just forget this variable. :)          unsigned long NullExtensionSize; ///< The buffer might be bigger than the actual data, if that's the case that unused space at the end of the buffer is filled with NULLs and NullExtensionSize reflects that unused buffer space in bytes. Those NULL extensions are mandatory for differential algorithms that have to take the following data words into account, thus have to access past the buffer's boundary. If you don't know what I'm talking about, just forget this variable. :)
83            buffer_t() {
84                pStart            = NULL;
85                Size              = 0;
86                NullExtensionSize = 0;
87            }
88      };      };
89    
90      /** Standard types of sample loops. */      /** Standard types of sample loops. */
# Line 219  namespace gig { Line 224  namespace gig {
224          dimension_velocity          = 0x82, ///< Key Velocity (this is the only dimension where the ranges can exactly be defined).          dimension_velocity          = 0x82, ///< Key Velocity (this is the only dimension where the ranges can exactly be defined).
225          dimension_channelaftertouch = 0x83, ///< Channel Key Pressure          dimension_channelaftertouch = 0x83, ///< Channel Key Pressure
226          dimension_releasetrigger    = 0x84, ///< Special dimension for triggering samples on releasing a key.          dimension_releasetrigger    = 0x84, ///< Special dimension for triggering samples on releasing a key.
227          dimension_keyboard          = 0x85, ///< Key Position          dimension_keyboard          = 0x85, ///< Dimension for keyswitching
228          dimension_modwheel          = 0x01, ///< Modulation Wheel (MIDI Controller 1)          dimension_modwheel          = 0x01, ///< Modulation Wheel (MIDI Controller 1)
229          dimension_breath            = 0x02, ///< Breath Controller (Coarse, MIDI Controller 2)          dimension_breath            = 0x02, ///< Breath Controller (Coarse, MIDI Controller 2)
230          dimension_foot              = 0x04, ///< Foot Pedal (Coarse, MIDI Controller 4)          dimension_foot              = 0x04, ///< Foot Pedal (Coarse, MIDI Controller 4)
# Line 279  namespace gig { Line 284  namespace gig {
284       *       *
285       * Note: The default value for crossfade points is 0,0,0,0. Layers with       * Note: The default value for crossfade points is 0,0,0,0. Layers with
286       * such a default value should be treated as if they would not have a       * such a default value should be treated as if they would not have a
287       * crossfade, that is the crossfade volume factor should <b>always</b>       * crossfade.
      * be 1.0f for such layers.  
288       */       */
289      struct crossfade_t {      struct crossfade_t {
290          #if WORDS_BIGENDIAN          #if WORDS_BIGENDIAN
# Line 405  namespace gig { Line 409  namespace gig {
409              bool               SustainDefeat;                 ///< If <i>true</i>: Sustain pedal will not hold a note.              bool               SustainDefeat;                 ///< If <i>true</i>: Sustain pedal will not hold a note.
410              bool               MSDecode;                      ///< Gigastudio flag: defines if Mid Side Recordings should be decoded.              bool               MSDecode;                      ///< Gigastudio flag: defines if Mid Side Recordings should be decoded.
411              uint16_t           SampleStartOffset;             ///< Number of samples the sample start should be moved (0 - 2000).              uint16_t           SampleStartOffset;             ///< Number of samples the sample start should be moved (0 - 2000).
412                double             SampleAttenuation;             ///< Sample volume (calculated from DLS::Sampler::Gain)
413    
414              // derived attributes from DLS::Sampler              // derived attributes from DLS::Sampler
415              DLS::Sampler::UnityNote;              DLS::Sampler::UnityNote;
416              DLS::Sampler::FineTune;              DLS::Sampler::FineTune;
# Line 484  namespace gig { Line 490  namespace gig {
490              buffer_t      LoadSampleDataWithNullSamplesExtension(uint NullSamplesCount);              buffer_t      LoadSampleDataWithNullSamplesExtension(uint NullSamplesCount);
491              buffer_t      LoadSampleDataWithNullSamplesExtension(unsigned long SampleCount, uint NullSamplesCount);              buffer_t      LoadSampleDataWithNullSamplesExtension(unsigned long SampleCount, uint NullSamplesCount);
492              buffer_t      GetCache();              buffer_t      GetCache();
493                // own static methods
494                static buffer_t CreateDecompressionBuffer(unsigned long MaxReadSize);
495                static void     DestroyDecompressionBuffer(buffer_t& DecompressionBuffer);
496              // overridden methods              // overridden methods
497              void          ReleaseSampleData();              void          ReleaseSampleData();
498              unsigned long SetPos(unsigned long SampleCount, RIFF::stream_whence_t Whence = RIFF::stream_start);              unsigned long SetPos(unsigned long SampleCount, RIFF::stream_whence_t Whence = RIFF::stream_start);
499              unsigned long GetPos();              unsigned long GetPos();
500              unsigned long Read(void* pBuffer, unsigned long SampleCount);              unsigned long Read(void* pBuffer, unsigned long SampleCount, buffer_t* pExternalDecompressionBuffer = NULL);
501              unsigned long ReadAndLoop(void* pBuffer, unsigned long SampleCount, playback_state_t* pPlaybackState);              unsigned long ReadAndLoop(void* pBuffer, unsigned long SampleCount, playback_state_t* pPlaybackState, buffer_t* pExternalDecompressionBuffer = NULL);
502          protected:          protected:
503              static unsigned int  Instances;               ///< Number of instances of class Sample.              static unsigned int  Instances;               ///< Number of instances of class Sample.
504              static unsigned long DecompressionBufferSize; ///< Current size of the decompression buffer.              static buffer_t      InternalDecompressionBuffer; ///< Buffer used for decompression as well as for truncation of 24 Bit -> 16 Bit samples.
             static void*         pDecompressionBuffer;    ///< Small buffer used for decompression only.  
505              unsigned long        FrameOffset;             ///< Current offset (sample points) in current sample frame (for decompression only).              unsigned long        FrameOffset;             ///< Current offset (sample points) in current sample frame (for decompression only).
506              unsigned long*       FrameTable;              ///< For positioning within compressed samples only: stores the offset values for each frame.              unsigned long*       FrameTable;              ///< For positioning within compressed samples only: stores the offset values for each frame.
507              unsigned long        SamplePos;               ///< For compressed samples only: stores the current position (in sample points).              unsigned long        SamplePos;               ///< For compressed samples only: stores the current position (in sample points).
508                unsigned long        SamplesInLastFrame;      ///< For compressed samples only: length of the last sample frame.
509                unsigned long        WorstCaseFrameSize;      ///< For compressed samples only: size (in bytes) of the largest possible sample frame.
510                unsigned long        SamplesPerFrame;         ///< For compressed samples only: number of samples in a full sample frame.
511              buffer_t             RAMCache;                ///< Buffers samples (already uncompressed) in RAM.              buffer_t             RAMCache;                ///< Buffers samples (already uncompressed) in RAM.
512    
513              Sample(File* pFile, RIFF::List* waveList, unsigned long WavePoolOffset);              Sample(File* pFile, RIFF::List* waveList, unsigned long WavePoolOffset);
# Line 561  namespace gig { Line 572  namespace gig {
572                  return (A > B) ? B : A;                  return (A > B) ? B : A;
573              }              }
574              inline long Abs(long val) { return (val > 0) ? val : -val; }              inline long Abs(long val) { return (val > 0) ? val : -val; }
575    
576                // Guess size (in bytes) of a compressed sample
577                inline unsigned long GuessSize(unsigned long samples) {
578                    // 16 bit: assume all frames are compressed - 1 byte
579                    // per sample and 5 bytes header per 2048 samples
580    
581                    // 24 bit: assume next best compression rate - 1.5
582                    // bytes per sample and 13 bytes header per 256
583                    // samples
584                    const unsigned long size =
585                        BitDepth == 24 ? samples + (samples >> 1) + (samples >> 8) * 13
586                                       : samples + (samples >> 10) * 5;
587                    // Double for stereo and add one worst case sample
588                    // frame
589                    return (Channels == 2 ? size << 1 : size) + WorstCaseFrameSize;
590                }
591    
592                // Worst case amount of sample points that can be read with the
593                // given decompression buffer.
594                inline unsigned long WorstCaseMaxSamples(buffer_t* pDecompressionBuffer) {
595                    return (unsigned long) ((float)pDecompressionBuffer->Size / (float)WorstCaseFrameSize * (float)SamplesPerFrame);
596                }
597          private:          private:
598              void ScanCompressedSample();              void ScanCompressedSample();
599              friend class File;              friend class File;
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