3rdparty/SoundTouch/FIFOSampleBuffer.h

////////////////////////////////////////////////////////////////////////////////
///
/// A buffer class for temporarily storaging sound samples, operates as a
/// first-in-first-out pipe.
///
/// Samples are added to the end of the sample buffer with the 'putSamples'
/// function, and are received from the beginning of the buffer by calling
/// the 'receiveSamples' function. The class automatically removes the
/// output samples from the buffer as well as grows the storage size
/// whenever necessary.
///
/// Author        : Copyright (c) Olli Parviainen
/// Author e-mail : oparviai 'at' iki.fi
/// SoundTouch WWW: http://www.surina.net/soundtouch
///
////////////////////////////////////////////////////////////////////////////////
//
// Last changed  : $Date: 2009-02-21 18:00:14 +0200 (Sat, 21 Feb 2009) $
// File revision : $Revision: 4 $
//
// $Id: FIFOSampleBuffer.h 63 2009-02-21 16:00:14Z oparviai $
//
////////////////////////////////////////////////////////////////////////////////
//
// License :
//
//  SoundTouch audio processing library
//  Copyright (c) Olli Parviainen
//
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation; either
//  version 2.1 of the License, or (at your option) any later version.
//
//  This library 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
//  Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with this library; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
////////////////////////////////////////////////////////////////////////////////

#ifndef FIFOSampleBuffer_H
#define FIFOSampleBuffer_H

#include "FIFOSamplePipe.h"

namespace soundtouch
{

/// Sample buffer working in FIFO (first-in-first-out) principle. The class takes
/// care of storage size adjustment and data moving during input/output operations.
///
/// Notice that in case of stereo audio, one sample is considered to consist of
/// both channel data.
class FIFOSampleBuffer : public FIFOSamplePipe
{
private:
    /// Sample buffer.
    SAMPLETYPE *buffer;

    // Raw unaligned buffer memory. 'buffer' is made aligned by pointing it to first
    // 16-byte aligned location of this buffer
    SAMPLETYPE *bufferUnaligned;

    /// Sample buffer size in bytes
    uint sizeInBytes;

    /// How many samples are currently in buffer.
    uint samplesInBuffer;

    /// Channels, 1=mono, 2=stereo.
    uint channels;

    /// Current position pointer to the buffer. This pointer is increased when samples are
    /// removed from the pipe so that it's necessary to actually rewind buffer (move data)
    /// only new data when is put to the pipe.
    uint bufferPos;

    /// Rewind the buffer by moving data from position pointed by 'bufferPos' to real
    /// beginning of the buffer.
    void rewind();

    /// Ensures that the buffer has capacity for at least this many samples.
    void ensureCapacity(uint capacityRequirement);

    /// Returns current capacity.
    uint getCapacity() const;

public:

    /// Constructor
    FIFOSampleBuffer(int numChannels = 2     ///< Number of channels, 1=mono, 2=stereo.
                                              ///< Default is stereo.
                     );

    /// destructor
    ~FIFOSampleBuffer();

    /// Returns a pointer to the beginning of the output samples.
    /// This function is provided for accessing the output samples directly.
    /// Please be careful for not to corrupt the book-keeping!
    ///
    /// When using this function to output samples, also remember to 'remove' the
    /// output samples from the buffer by calling the
    /// 'receiveSamples(numSamples)' function
    virtual SAMPLETYPE *ptrBegin();

    /// Returns a pointer to the end of the used part of the sample buffer (i.e.
    /// where the new samples are to be inserted). This function may be used for
    /// inserting new samples into the sample buffer directly. Please be careful
    /// not corrupt the book-keeping!
    ///
    /// When using this function as means for inserting new samples, also remember
    /// to increase the sample count afterwards, by calling  the
    /// 'putSamples(numSamples)' function.
    SAMPLETYPE *ptrEnd(
                uint slackCapacity   ///< How much free capacity (in samples) there _at least_
                                     ///< should be so that the caller can succesfully insert the
                                     ///< desired samples to the buffer. If necessary, the function
                                     ///< grows the buffer size to comply with this requirement.
                );

    /// Adds 'numSamples' pcs of samples from the 'samples' memory position to
    /// the sample buffer.
    virtual void putSamples(const SAMPLETYPE *samples,  ///< Pointer to samples.
                            uint numSamples                         ///< Number of samples to insert.
                            );

    /// Adjusts the book-keeping to increase number of samples in the buffer without
    /// copying any actual samples.
    ///
    /// This function is used to update the number of samples in the sample buffer
    /// when accessing the buffer directly with 'ptrEnd' function. Please be
    /// careful though!
    virtual void putSamples(uint numSamples   ///< Number of samples been inserted.
                            );

    /// Output samples from beginning of the sample buffer. Copies requested samples to
    /// output buffer and removes them from the sample buffer. If there are less than
    /// 'numsample' samples in the buffer, returns all that available.
    ///
    /// \return Number of samples returned.
    virtual uint receiveSamples(SAMPLETYPE *output, ///< Buffer where to copy output samples.
                                uint maxSamples                 ///< How many samples to receive at max.
                                );

    /// Adjusts book-keeping so that given number of samples are removed from beginning of the
    /// sample buffer without copying them anywhere.
    ///
    /// Used to reduce the number of samples in the buffer when accessing the sample buffer directly
    /// with 'ptrBegin' function.
    virtual uint receiveSamples(uint maxSamples   ///< Remove this many samples from the beginning of pipe.
                                );

    /// Returns number of samples currently available.
    virtual uint numSamples() const;

    /// Sets number of channels, 1 = mono, 2 = stereo.
    void setChannels(int numChannels);

    /// Returns nonzero if there aren't any samples available for outputting.
    virtual int isEmpty() const;

    /// Clears all the samples.
    virtual void clear();
};

}

#endif
1	////////////////////////////////////////////////////////////////////////////////
2	///
3	/// A buffer class for temporarily storaging sound samples, operates as a
4	/// first-in-first-out pipe.
5	///
6	/// Samples are added to the end of the sample buffer with the 'putSamples'
7	/// function, and are received from the beginning of the buffer by calling
8	/// the 'receiveSamples' function. The class automatically removes the
9	/// output samples from the buffer as well as grows the storage size
10	/// whenever necessary.
11	///
12	/// Author : Copyright (c) Olli Parviainen
13	/// Author e-mail : oparviai 'at' iki.fi
14	/// SoundTouch WWW: http://www.surina.net/soundtouch
15	///
16	////////////////////////////////////////////////////////////////////////////////
17	//
18	// Last changed : $Date: 2009-02-21 18:00:14 +0200 (Sat, 21 Feb 2009) $
19	// File revision : $Revision: 4 $
20	//
21	// $Id: FIFOSampleBuffer.h 63 2009-02-21 16:00:14Z oparviai $
22	//
23	////////////////////////////////////////////////////////////////////////////////
24	//
25	// License :
26	//
27	// SoundTouch audio processing library
28	// Copyright (c) Olli Parviainen
29	//
30	// This library is free software; you can redistribute it and/or
31	// modify it under the terms of the GNU Lesser General Public
32	// License as published by the Free Software Foundation; either
33	// version 2.1 of the License, or (at your option) any later version.
34	//
35	// This library is distributed in the hope that it will be useful,
36	// but WITHOUT ANY WARRANTY; without even the implied warranty of
37	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
38	// Lesser General Public License for more details.
39	//
40	// You should have received a copy of the GNU Lesser General Public
41	// License along with this library; if not, write to the Free Software
42	// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
43	//
44	////////////////////////////////////////////////////////////////////////////////
45
46	#ifndef FIFOSampleBuffer_H
47	#define FIFOSampleBuffer_H
48
49	#include "FIFOSamplePipe.h"
50
51	namespace soundtouch
52	{
53
54	/// Sample buffer working in FIFO (first-in-first-out) principle. The class takes
55	/// care of storage size adjustment and data moving during input/output operations.
56	///
57	/// Notice that in case of stereo audio, one sample is considered to consist of
58	/// both channel data.
59	class FIFOSampleBuffer : public FIFOSamplePipe
60	{
61	private:
62	/// Sample buffer.
63	SAMPLETYPE *buffer;
64
65	// Raw unaligned buffer memory. 'buffer' is made aligned by pointing it to first
66	// 16-byte aligned location of this buffer
67	SAMPLETYPE *bufferUnaligned;
68
69	/// Sample buffer size in bytes
70	uint sizeInBytes;
71
72	/// How many samples are currently in buffer.
73	uint samplesInBuffer;
74
75	/// Channels, 1=mono, 2=stereo.
76	uint channels;
77
78	/// Current position pointer to the buffer. This pointer is increased when samples are
79	/// removed from the pipe so that it's necessary to actually rewind buffer (move data)
80	/// only new data when is put to the pipe.
81	uint bufferPos;
82
83	/// Rewind the buffer by moving data from position pointed by 'bufferPos' to real
84	/// beginning of the buffer.
85	void rewind();
86
87	/// Ensures that the buffer has capacity for at least this many samples.
88	void ensureCapacity(uint capacityRequirement);
89
90	/// Returns current capacity.
91	uint getCapacity() const;
92
93	public:
94
95	/// Constructor
96	FIFOSampleBuffer(int numChannels = 2 ///< Number of channels, 1=mono, 2=stereo.
97	///< Default is stereo.
98	);
99
100	/// destructor
101	~FIFOSampleBuffer();
102
103	/// Returns a pointer to the beginning of the output samples.
104	/// This function is provided for accessing the output samples directly.
105	/// Please be careful for not to corrupt the book-keeping!
106	///
107	/// When using this function to output samples, also remember to 'remove' the
108	/// output samples from the buffer by calling the
109	/// 'receiveSamples(numSamples)' function
110	virtual SAMPLETYPE *ptrBegin();
111
112	/// Returns a pointer to the end of the used part of the sample buffer (i.e.
113	/// where the new samples are to be inserted). This function may be used for
114	/// inserting new samples into the sample buffer directly. Please be careful
115	/// not corrupt the book-keeping!
116	///
117	/// When using this function as means for inserting new samples, also remember
118	/// to increase the sample count afterwards, by calling the
119	/// 'putSamples(numSamples)' function.
120	SAMPLETYPE *ptrEnd(
121	uint slackCapacity ///< How much free capacity (in samples) there _at least_
122	///< should be so that the caller can succesfully insert the
123	///< desired samples to the buffer. If necessary, the function
124	///< grows the buffer size to comply with this requirement.
125	);
126
127	/// Adds 'numSamples' pcs of samples from the 'samples' memory position to
128	/// the sample buffer.
129	virtual void putSamples(const SAMPLETYPE *samples, ///< Pointer to samples.
130	uint numSamples ///< Number of samples to insert.
131	);
132
133	/// Adjusts the book-keeping to increase number of samples in the buffer without
134	/// copying any actual samples.
135	///
136	/// This function is used to update the number of samples in the sample buffer
137	/// when accessing the buffer directly with 'ptrEnd' function. Please be
138	/// careful though!
139	virtual void putSamples(uint numSamples ///< Number of samples been inserted.
140	);
141
142	/// Output samples from beginning of the sample buffer. Copies requested samples to
143	/// output buffer and removes them from the sample buffer. If there are less than
144	/// 'numsample' samples in the buffer, returns all that available.
145	///
146	/// \return Number of samples returned.
147	virtual uint receiveSamples(SAMPLETYPE *output, ///< Buffer where to copy output samples.
148	uint maxSamples ///< How many samples to receive at max.
149	);
150
151	/// Adjusts book-keeping so that given number of samples are removed from beginning of the
152	/// sample buffer without copying them anywhere.
153	///
154	/// Used to reduce the number of samples in the buffer when accessing the sample buffer directly
155	/// with 'ptrBegin' function.
156	virtual uint receiveSamples(uint maxSamples ///< Remove this many samples from the beginning of pipe.
157	);
158
159	/// Returns number of samples currently available.
160	virtual uint numSamples() const;
161
162	/// Sets number of channels, 1 = mono, 2 = stereo.
163	void setChannels(int numChannels);
164
165	/// Returns nonzero if there aren't any samples available for outputting.
166	virtual int isEmpty() const;
167
168	/// Clears all the samples.
169	virtual void clear();
170	};
171
172	}
173
174	#endif