engines/common/SampleFile.h

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003 - 2009 Christian Schoenebeck                       *
 *   Copyright (C) 2009 - 2011 Grigor Iliev                                *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the Free Software           *
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,                 *
 *   MA  02111-1307  USA                                                   *
 ***************************************************************************/

#ifndef __LS_SAMPLEFILE_H__
#define __LS_SAMPLEFILE_H__

#include "Sample.h"

#include <sndfile.h>
#include "../../common/global.h"

namespace LinuxSampler {
    class SampleFile : public Sample {
        public:
            SampleFile(String File, bool DontClose = false);
            virtual ~SampleFile();

            String GetFile() { return File; }

            virtual String  GetName() { return File; }
            virtual int     GetSampleRate() { return SampleRate; }
            virtual int     GetChannelCount() { return ChannelCount; }
            virtual long    GetTotalFrameCount() { return TotalFrameCount; }
            virtual int     GetFrameSize() { return FrameSize; }
            virtual int     GetLoops() { return Loops; }
            virtual uint    GetLoopStart() { return LoopStart; }
            virtual uint    GetLoopEnd() { return LoopEnd; }

            virtual buffer_t  LoadSampleData();
            virtual buffer_t  LoadSampleData(unsigned long FrameCount);
            virtual buffer_t  LoadSampleDataWithNullSamplesExtension(uint NullFrameCount);
            virtual buffer_t  LoadSampleDataWithNullSamplesExtension(unsigned long FrameCount, uint NullFramesCount);
            virtual void      ReleaseSampleData();
            virtual buffer_t  GetCache();
            virtual long      Read(void* pBuffer, unsigned long FrameCount);

            virtual unsigned long ReadAndLoop (
                void*           pBuffer,
                unsigned long   FrameCount,
                PlaybackState*  pPlaybackState
            );

            virtual long SetPos(unsigned long FrameOffset);
            virtual long GetPos();

            void Open();
            void Close();

        private:
            String File;
            int    SampleRate;
            int    ChannelCount;
            int    Format;
            int    FrameSize;         ///< In bytes
            long   TotalFrameCount;
            int    Loops;
            uint   LoopStart;
            uint   LoopEnd;

            SNDFILE* pSndFile;

            buffer_t RAMCache;        ///< Buffers samples (already uncompressed) in RAM.
            long SetPos(unsigned long FrameCount, int Whence);
    };

    template <class R>
    class SampleFileBase : public SampleFile {
        public:
            SampleFileBase(String File, bool DontClose = false) : SampleFile(File, DontClose) { }
            virtual ~SampleFileBase() { }


            /**
             * Reads \a SampleCount number of sample points from the position stored
             * in \a pPlaybackState into the buffer pointed by \a pBuffer and moves
             * the position within the sample respectively, this method honors the
             * looping informations of the sample (if any). Use this
             * method if you don't want to load the sample into RAM, thus for disk
             * streaming. All this methods needs to know to proceed with streaming
             * for the next time you call this method is stored in \a pPlaybackState.
             * You have to allocate and initialize the playback_state_t structure by
             * yourself before you use it to stream a sample:
             * @code
             * PlaybackState playbackstate;
             * playbackstate.position         = 0;
             * playbackstate.reverse          = false;
             * playbackstate.loop_cycles_left = pSample->LoopPlayCount;
             * @endcode
             * You don't have to take care of things like if there is actually a loop
             * defined or if the current read position is located within a loop area.
             * The method already handles such cases by itself.
             *
             * @param pBuffer          destination buffer
             * @param FrameCount       number of sample points to read
             * @param pPlaybackState   will be used to store and reload the playback
             *                         state for the next ReadAndLoop() call
             * @returns                number of successfully read sample points
             */
            unsigned long ReadAndLoop (
                void*           pBuffer,
                unsigned long   FrameCount,
                PlaybackState*  pPlaybackState,
                R*              pRegion
            ) {
                // TODO: startAddrsCoarseOffset, endAddrsCoarseOffset
                unsigned long samplestoread = FrameCount, totalreadsamples = 0, readsamples, samplestoloopend;
                uint8_t* pDst = (uint8_t*) pBuffer;
                SetPos(pPlaybackState->position);
                if (pRegion->HasLoop()) {
                    do {
                        if (GetPos() > pRegion->GetLoopEnd()) SetPos(pRegion->GetLoopStart());
                        samplestoloopend  = pRegion->GetLoopEnd() - GetPos();
                        readsamples       = Read(&pDst[totalreadsamples * GetFrameSize()], Min(samplestoread, samplestoloopend));
                        samplestoread    -= readsamples;
                        totalreadsamples += readsamples;
                        if (readsamples == samplestoloopend) {
                            SetPos(pRegion->GetLoopStart());
                        }
                    } while (samplestoread && readsamples);
                } else {
                    totalreadsamples = Read(pBuffer, FrameCount);
                }

                pPlaybackState->position = GetPos();

                return totalreadsamples;
            }

        protected:
            inline long Min(long A, long B) { return (A > B) ? B : A; }
    };
} // namespace LinuxSampler

#endif // __LS_SAMPLEFILE_H__
1	iliev	2012	/***************************************************************************
2			* *
3			* LinuxSampler - modular, streaming capable sampler *
4			* *
5			* Copyright (C) 2003 - 2009 Christian Schoenebeck *
6	persson	2167	* Copyright (C) 2009 - 2011 Grigor Iliev *
7	iliev	2012	* *
8			* This program is free software; you can redistribute it and/or modify *
9			* it under the terms of the GNU General Public License as published by *
10			* the Free Software Foundation; either version 2 of the License, or *
11			* (at your option) any later version. *
12			* *
13			* This program is distributed in the hope that it will be useful, *
14			* but WITHOUT ANY WARRANTY; without even the implied warranty of *
15			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16			* GNU General Public License for more details. *
17			* *
18			* You should have received a copy of the GNU General Public License *
19			* along with this program; if not, write to the Free Software *
20			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
21			* MA 02111-1307 USA *
22			***************************************************************************/
23
24			#ifndef __LS_SAMPLEFILE_H__
25			#define __LS_SAMPLEFILE_H__
26
27			#include "Sample.h"
28
29			#include <sndfile.h>
30			#include "../../common/global.h"
31
32			namespace LinuxSampler {
33			class SampleFile : public Sample {
34			public:
35			SampleFile(String File, bool DontClose = false);
36			virtual ~SampleFile();
37
38			String GetFile() { return File; }
39
40			virtual String GetName() { return File; }
41			virtual int GetSampleRate() { return SampleRate; }
42			virtual int GetChannelCount() { return ChannelCount; }
43			virtual long GetTotalFrameCount() { return TotalFrameCount; }
44			virtual int GetFrameSize() { return FrameSize; }
45	persson	2167	virtual int GetLoops() { return Loops; }
46			virtual uint GetLoopStart() { return LoopStart; }
47			virtual uint GetLoopEnd() { return LoopEnd; }
48	iliev	2012
49			virtual buffer_t LoadSampleData();
50			virtual buffer_t LoadSampleData(unsigned long FrameCount);
51			virtual buffer_t LoadSampleDataWithNullSamplesExtension(uint NullFrameCount);
52			virtual buffer_t LoadSampleDataWithNullSamplesExtension(unsigned long FrameCount, uint NullFramesCount);
53			virtual void ReleaseSampleData();
54			virtual buffer_t GetCache();
55			virtual long Read(void* pBuffer, unsigned long FrameCount);
56
57			virtual unsigned long ReadAndLoop (
58			void* pBuffer,
59			unsigned long FrameCount,
60			PlaybackState* pPlaybackState
61			);
62
63			virtual long SetPos(unsigned long FrameOffset);
64			virtual long GetPos();
65
66			void Open();
67			void Close();
68
69			private:
70			String File;
71			int SampleRate;
72			int ChannelCount;
73			int Format;
74			int FrameSize; ///< In bytes
75			long TotalFrameCount;
76	persson	2167	int Loops;
77			uint LoopStart;
78			uint LoopEnd;
79	iliev	2012
80			SNDFILE* pSndFile;
81
82			buffer_t RAMCache; ///< Buffers samples (already uncompressed) in RAM.
83			long SetPos(unsigned long FrameCount, int Whence);
84			};
85	iliev	2021
86			template <class R>
87			class SampleFileBase : public SampleFile {
88			public:
89			SampleFileBase(String File, bool DontClose = false) : SampleFile(File, DontClose) { }
90			virtual ~SampleFileBase() { }
91
92
93
94			/**
95			* Reads \a SampleCount number of sample points from the position stored
96			* in \a pPlaybackState into the buffer pointed by \a pBuffer and moves
97			* the position within the sample respectively, this method honors the
98			* looping informations of the sample (if any). Use this
99			* method if you don't want to load the sample into RAM, thus for disk
100			* streaming. All this methods needs to know to proceed with streaming
101			* for the next time you call this method is stored in \a pPlaybackState.
102			* You have to allocate and initialize the playback_state_t structure by
103			* yourself before you use it to stream a sample:
104			* @code
105			* PlaybackState playbackstate;
106			* playbackstate.position = 0;
107			* playbackstate.reverse = false;
108			* playbackstate.loop_cycles_left = pSample->LoopPlayCount;
109			* @endcode
110			* You don't have to take care of things like if there is actually a loop
111			* defined or if the current read position is located within a loop area.
112			* The method already handles such cases by itself.
113			*
114			* @param pBuffer destination buffer
115			* @param FrameCount number of sample points to read
116			* @param pPlaybackState will be used to store and reload the playback
117			* state for the next ReadAndLoop() call
118			* @returns number of successfully read sample points
119			*/
120			unsigned long ReadAndLoop (
121			void* pBuffer,
122			unsigned long FrameCount,
123			PlaybackState* pPlaybackState,
124			R* pRegion
125			) {
126			// TODO: startAddrsCoarseOffset, endAddrsCoarseOffset
127			unsigned long samplestoread = FrameCount, totalreadsamples = 0, readsamples, samplestoloopend;
128			uint8_t* pDst = (uint8_t*) pBuffer;
129			SetPos(pPlaybackState->position);
130			if (pRegion->HasLoop()) {
131			do {
132	iliev	2216	if (GetPos() > pRegion->GetLoopEnd()) SetPos(pRegion->GetLoopStart());
133	iliev	2021	samplestoloopend = pRegion->GetLoopEnd() - GetPos();
134			readsamples = Read(&pDst[totalreadsamples * GetFrameSize()], Min(samplestoread, samplestoloopend));
135			samplestoread -= readsamples;
136			totalreadsamples += readsamples;
137			if (readsamples == samplestoloopend) {
138			SetPos(pRegion->GetLoopStart());
139			}
140			} while (samplestoread && readsamples);
141			} else {
142			totalreadsamples = Read(pBuffer, FrameCount);
143			}
144
145			pPlaybackState->position = GetPos();
146
147			return totalreadsamples;
148			}
149
150			protected:
151			inline long Min(long A, long B) { return (A > B) ? B : A; }
152			};
153	iliev	2012	} // namespace LinuxSampler
154
155			#endif // __LS_SAMPLEFILE_H__