engines/gig/Stream.cpp

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
 *   Copyright (C) 2005 Christian Schoenebeck                              *
 *                                                                         *
 *   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                                                   *
 ***************************************************************************/

#include "Stream.h"

namespace LinuxSampler { namespace gig {

    uint Stream::UnusedStreams = 0;
    uint Stream::TotalStreams = 0;

    /// Returns number of refilled sample points or a value < 0 on error.
    int Stream::ReadAhead(unsigned long SampleCount) {
        if (this->State == state_unused) return -1;
        if (this->State == state_end)    return  0;
        if (!SampleCount)                return  0;
        if (!pRingBuffer->write_space()) return  0;

        ::gig::Sample* pSample = pDimRgn->pSample;
        long total_readsamples = 0, readsamples = 0;
        long samplestoread = SampleCount / pSample->Channels;
        uint8_t* pBuf = pRingBuffer->get_write_ptr();
        bool endofsamplereached;

        // refill the disk stream buffer
        if (this->DoLoop) { // honor looping
            total_readsamples  = pSample->ReadAndLoop(pBuf, samplestoread, &this->PlaybackState, pDimRgn, pDecompressionBuffer);
            endofsamplereached = (this->PlaybackState.position >= pSample->SamplesTotal);
            dmsg(5,("Refilled stream %d with %d (SamplePos: %d)", this->hThis, total_readsamples, this->PlaybackState.position));
        }
        else { // normal forward playback

            pSample->SetPos(this->SampleOffset); // recover old position

            do {
                readsamples        = pSample->Read(&pBuf[total_readsamples * pSample->FrameSize], samplestoread, pDecompressionBuffer);
                samplestoread     -= readsamples;
                total_readsamples += readsamples;
            } while (samplestoread && readsamples > 0);

            // we have to store the position within the sample, because other streams might use the same sample
            this->SampleOffset = pSample->GetPos();

            endofsamplereached = (SampleOffset >= pSample->SamplesTotal);
            dmsg(5,("Refilled stream %d with %d (SamplePos: %d)", this->hThis, total_readsamples, this->SampleOffset));
        }

        // we must delay the increment_write_ptr_with_wrap() after the while() loop because we need to
        // ensure that we read exactly SampleCount sample, otherwise the buffer wrapping code will fail
        pRingBuffer->increment_write_ptr_with_wrap(total_readsamples * pSample->FrameSize);

        // update stream state
        if (endofsamplereached) SetState(state_end);
        else                    SetState(state_active);

        return total_readsamples;
    }

    void Stream::WriteSilence(unsigned long SilenceSampleWords) {
        memset(pRingBuffer->get_write_ptr(), 0, SilenceSampleWords * BytesPerSample);
        pRingBuffer->increment_write_ptr_with_wrap(SilenceSampleWords * BytesPerSample);
    }

    Stream::Stream( ::gig::buffer_t* pDecompressionBuffer, uint BufferSize, uint BufferWrapElements) {
        this->pExportReference       = NULL;
        this->State                  = state_unused;
        this->hThis                  = 0;
        this->pDimRgn                = NULL;
        this->SampleOffset           = 0;
        this->PlaybackState.position = 0;
        this->PlaybackState.reverse  = false;
        this->pRingBuffer            = new RingBuffer<uint8_t>(BufferSize * 3, BufferWrapElements * 3);
        this->pDecompressionBuffer   = pDecompressionBuffer;
        UnusedStreams++;
        TotalStreams++;
    }

    Stream::~Stream() {
        Reset();
        if (pRingBuffer) delete pRingBuffer;
        UnusedStreams--;
        TotalStreams--;
    }

    /// Called by disk thread to activate the disk stream.
    void Stream::Launch(Stream::Handle hStream, reference_t* pExportReference, ::gig::DimensionRegion* pDimRgn, unsigned long SampleOffset, bool DoLoop) {
        UnusedStreams--;
        this->pExportReference               = pExportReference;
        this->hThis                          = hStream;
        this->pDimRgn                        = pDimRgn;
        this->SampleOffset                   = SampleOffset;
        this->PlaybackState.position         = SampleOffset;
        this->PlaybackState.reverse          = false;
        this->PlaybackState.loop_cycles_left = pDimRgn->pSample->LoopPlayCount;
        this->DoLoop                         = DoLoop;
        BytesPerSample                       = pDimRgn->pSample->BitDepth / 8;
        SetState(state_active);
    }

}} // namespace LinuxSampler::gig
1	/***************************************************************************
2	* *
3	* LinuxSampler - modular, streaming capable sampler *
4	* *
5	* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	* Copyright (C) 2005 Christian Schoenebeck *
7	* *
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	#include "Stream.h"
25
26	namespace LinuxSampler { namespace gig {
27
28	uint Stream::UnusedStreams = 0;
29	uint Stream::TotalStreams = 0;
30
31	/// Returns number of refilled sample points or a value < 0 on error.
32	int Stream::ReadAhead(unsigned long SampleCount) {
33	if (this->State == state_unused) return -1;
34	if (this->State == state_end) return 0;
35	if (!SampleCount) return 0;
36	if (!pRingBuffer->write_space()) return 0;
37
38	::gig::Sample* pSample = pDimRgn->pSample;
39	long total_readsamples = 0, readsamples = 0;
40	long samplestoread = SampleCount / pSample->Channels;
41	uint8_t* pBuf = pRingBuffer->get_write_ptr();
42	bool endofsamplereached;
43
44	// refill the disk stream buffer
45	if (this->DoLoop) { // honor looping
46	total_readsamples = pSample->ReadAndLoop(pBuf, samplestoread, &this->PlaybackState, pDimRgn, pDecompressionBuffer);
47	endofsamplereached = (this->PlaybackState.position >= pSample->SamplesTotal);
48	dmsg(5,("Refilled stream %d with %d (SamplePos: %d)", this->hThis, total_readsamples, this->PlaybackState.position));
49	}
50	else { // normal forward playback
51
52	pSample->SetPos(this->SampleOffset); // recover old position
53
54	do {
55	readsamples = pSample->Read(&pBuf[total_readsamples * pSample->FrameSize], samplestoread, pDecompressionBuffer);
56	samplestoread -= readsamples;
57	total_readsamples += readsamples;
58	} while (samplestoread && readsamples > 0);
59
60	// we have to store the position within the sample, because other streams might use the same sample
61	this->SampleOffset = pSample->GetPos();
62
63	endofsamplereached = (SampleOffset >= pSample->SamplesTotal);
64	dmsg(5,("Refilled stream %d with %d (SamplePos: %d)", this->hThis, total_readsamples, this->SampleOffset));
65	}
66
67	// we must delay the increment_write_ptr_with_wrap() after the while() loop because we need to
68	// ensure that we read exactly SampleCount sample, otherwise the buffer wrapping code will fail
69	pRingBuffer->increment_write_ptr_with_wrap(total_readsamples * pSample->FrameSize);
70
71	// update stream state
72	if (endofsamplereached) SetState(state_end);
73	else SetState(state_active);
74
75	return total_readsamples;
76	}
77
78	void Stream::WriteSilence(unsigned long SilenceSampleWords) {
79	memset(pRingBuffer->get_write_ptr(), 0, SilenceSampleWords * BytesPerSample);
80	pRingBuffer->increment_write_ptr_with_wrap(SilenceSampleWords * BytesPerSample);
81	}
82
83	Stream::Stream( ::gig::buffer_t* pDecompressionBuffer, uint BufferSize, uint BufferWrapElements) {
84	this->pExportReference = NULL;
85	this->State = state_unused;
86	this->hThis = 0;
87	this->pDimRgn = NULL;
88	this->SampleOffset = 0;
89	this->PlaybackState.position = 0;
90	this->PlaybackState.reverse = false;
91	this->pRingBuffer = new RingBuffer<uint8_t>(BufferSize * 3, BufferWrapElements * 3);
92	this->pDecompressionBuffer = pDecompressionBuffer;
93	UnusedStreams++;
94	TotalStreams++;
95	}
96
97	Stream::~Stream() {
98	Reset();
99	if (pRingBuffer) delete pRingBuffer;
100	UnusedStreams--;
101	TotalStreams--;
102	}
103
104	/// Called by disk thread to activate the disk stream.
105	void Stream::Launch(Stream::Handle hStream, reference_t* pExportReference, ::gig::DimensionRegion* pDimRgn, unsigned long SampleOffset, bool DoLoop) {
106	UnusedStreams--;
107	this->pExportReference = pExportReference;
108	this->hThis = hStream;
109	this->pDimRgn = pDimRgn;
110	this->SampleOffset = SampleOffset;
111	this->PlaybackState.position = SampleOffset;
112	this->PlaybackState.reverse = false;
113	this->PlaybackState.loop_cycles_left = pDimRgn->pSample->LoopPlayCount;
114	this->DoLoop = DoLoop;
115	BytesPerSample = pDimRgn->pSample->BitDepth / 8;
116	SetState(state_active);
117	}
118
119	}} // namespace LinuxSampler::gig