/[svn]/libgig/trunk/src/gig.h
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revision 350 by schoenebeck, Tue Jan 25 21:54:24 2005 UTC revision 437 by persson, Wed Mar 9 22:02:40 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_roundrobin        = 0x86, ///< Different samples triggered each time a note is played, dimension regions selected in sequence
229            dimension_random            = 0x87, ///< Different samples triggered each time a note is played, random order
230          dimension_modwheel          = 0x01, ///< Modulation Wheel (MIDI Controller 1)          dimension_modwheel          = 0x01, ///< Modulation Wheel (MIDI Controller 1)
231          dimension_breath            = 0x02, ///< Breath Controller (Coarse, MIDI Controller 2)          dimension_breath            = 0x02, ///< Breath Controller (Coarse, MIDI Controller 2)
232          dimension_foot              = 0x04, ///< Foot Pedal (Coarse, MIDI Controller 4)          dimension_foot              = 0x04, ///< Foot Pedal (Coarse, MIDI Controller 4)
# Line 279  namespace gig { Line 286  namespace gig {
286       *       *
287       * 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
288       * 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
289       * crossfade, that is the crossfade volume factor should <b>always</b>       * crossfade.
      * be 1.0f for such layers.  
290       */       */
291      struct crossfade_t {      struct crossfade_t {
292          #if WORDS_BIGENDIAN          #if WORDS_BIGENDIAN
# Line 405  namespace gig { Line 411  namespace gig {
411              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.
412              bool               MSDecode;                      ///< Gigastudio flag: defines if Mid Side Recordings should be decoded.              bool               MSDecode;                      ///< Gigastudio flag: defines if Mid Side Recordings should be decoded.
413              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).
414                double             SampleAttenuation;             ///< Sample volume (calculated from DLS::Sampler::Gain)
415    
416              // derived attributes from DLS::Sampler              // derived attributes from DLS::Sampler
417              DLS::Sampler::UnityNote;              DLS::Sampler::UnityNote;
418              DLS::Sampler::FineTune;              DLS::Sampler::FineTune;
# Line 477  namespace gig { Line 485  namespace gig {
485              uint32_t       LoopFraction;      ///< The fractional value specifies a fraction of a sample at which to loop (only if Loops > 0). This allows a loop to be fine tuned at a resolution greater than one sample. A value of 0 means no fraction, a value of 0x80000000 means 1/2 of a sample length. 0xFFFFFFFF is the smallest fraction of a sample that can be represented.              uint32_t       LoopFraction;      ///< The fractional value specifies a fraction of a sample at which to loop (only if Loops > 0). This allows a loop to be fine tuned at a resolution greater than one sample. A value of 0 means no fraction, a value of 0x80000000 means 1/2 of a sample length. 0xFFFFFFFF is the smallest fraction of a sample that can be represented.
486              uint32_t       LoopPlayCount;     ///< Number of times the loop should be played (only if Loops > 0, a value of 0 = infinite).              uint32_t       LoopPlayCount;     ///< Number of times the loop should be played (only if Loops > 0, a value of 0 = infinite).
487              bool           Compressed;        ///< If the sample wave is compressed (probably just interesting for instrument and sample editors, as this library already handles the decompression in it's sample access methods anyway).              bool           Compressed;        ///< If the sample wave is compressed (probably just interesting for instrument and sample editors, as this library already handles the decompression in it's sample access methods anyway).
488                uint32_t       TruncatedBits;     ///< For 24-bit compressed samples only: number of bits truncated during compression (0, 4 or 6)
489                bool           Dithered;          ///< For 24-bit compressed samples only: if dithering was used during compression with bit reduction
490    
491              // own methods              // own methods
492              buffer_t      LoadSampleData();              buffer_t      LoadSampleData();
# Line 484  namespace gig { Line 494  namespace gig {
494              buffer_t      LoadSampleDataWithNullSamplesExtension(uint NullSamplesCount);              buffer_t      LoadSampleDataWithNullSamplesExtension(uint NullSamplesCount);
495              buffer_t      LoadSampleDataWithNullSamplesExtension(unsigned long SampleCount, uint NullSamplesCount);              buffer_t      LoadSampleDataWithNullSamplesExtension(unsigned long SampleCount, uint NullSamplesCount);
496              buffer_t      GetCache();              buffer_t      GetCache();
497                // own static methods
498                static buffer_t CreateDecompressionBuffer(unsigned long MaxReadSize);
499                static void     DestroyDecompressionBuffer(buffer_t& DecompressionBuffer);
500              // overridden methods              // overridden methods
501              void          ReleaseSampleData();              void          ReleaseSampleData();
502              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);
503              unsigned long GetPos();              unsigned long GetPos();
504              unsigned long Read(void* pBuffer, unsigned long SampleCount);              unsigned long Read(void* pBuffer, unsigned long SampleCount, buffer_t* pExternalDecompressionBuffer = NULL);
505              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);
506          protected:          protected:
507              static unsigned int  Instances;               ///< Number of instances of class Sample.              static unsigned int  Instances;               ///< Number of instances of class Sample.
508              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.  
509              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).
510              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.
511              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).
512                unsigned long        SamplesInLastFrame;      ///< For compressed samples only: length of the last sample frame.
513                unsigned long        WorstCaseFrameSize;      ///< For compressed samples only: size (in bytes) of the largest possible sample frame.
514                unsigned long        SamplesPerFrame;         ///< For compressed samples only: number of samples in a full sample frame.
515              buffer_t             RAMCache;                ///< Buffers samples (already uncompressed) in RAM.              buffer_t             RAMCache;                ///< Buffers samples (already uncompressed) in RAM.
516    
517              Sample(File* pFile, RIFF::List* waveList, unsigned long WavePoolOffset);              Sample(File* pFile, RIFF::List* waveList, unsigned long WavePoolOffset);
# Line 561  namespace gig { Line 576  namespace gig {
576                  return (A > B) ? B : A;                  return (A > B) ? B : A;
577              }              }
578              inline long Abs(long val) { return (val > 0) ? val : -val; }              inline long Abs(long val) { return (val > 0) ? val : -val; }
579    
580                // Guess size (in bytes) of a compressed sample
581                inline unsigned long GuessSize(unsigned long samples) {
582                    // 16 bit: assume all frames are compressed - 1 byte
583                    // per sample and 5 bytes header per 2048 samples
584    
585                    // 24 bit: assume next best compression rate - 1.5
586                    // bytes per sample and 13 bytes header per 256
587                    // samples
588                    const unsigned long size =
589                        BitDepth == 24 ? samples + (samples >> 1) + (samples >> 8) * 13
590                                       : samples + (samples >> 10) * 5;
591                    // Double for stereo and add one worst case sample
592                    // frame
593                    return (Channels == 2 ? size << 1 : size) + WorstCaseFrameSize;
594                }
595    
596                // Worst case amount of sample points that can be read with the
597                // given decompression buffer.
598                inline unsigned long WorstCaseMaxSamples(buffer_t* pDecompressionBuffer) {
599                    return (unsigned long) ((float)pDecompressionBuffer->Size / (float)WorstCaseFrameSize * (float)SamplesPerFrame);
600                }
601          private:          private:
602              void ScanCompressedSample();              void ScanCompressedSample();
603              friend class File;              friend class File;
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