engines/gig/Stream.cpp

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
 *   Copyright (C) 2005 - 2007 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"

#include "../../common/global_private.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,false>(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 - 2007 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	#include "../../common/global_private.h"
27
28	namespace LinuxSampler { namespace gig {
29
30	uint Stream::UnusedStreams = 0;
31	uint Stream::TotalStreams = 0;
32
33	/// Returns number of refilled sample points or a value < 0 on error.
34	int Stream::ReadAhead(unsigned long SampleCount) {
35	if (this->State == state_unused) return -1;
36	if (this->State == state_end) return 0;
37	if (!SampleCount) return 0;
38	if (!pRingBuffer->write_space()) return 0;
39
40	::gig::Sample* pSample = pDimRgn->pSample;
41	long total_readsamples = 0, readsamples = 0;
42	long samplestoread = SampleCount / pSample->Channels;
43	uint8_t* pBuf = pRingBuffer->get_write_ptr();
44	bool endofsamplereached;
45
46	// refill the disk stream buffer
47	if (this->DoLoop) { // honor looping
48	total_readsamples = pSample->ReadAndLoop(pBuf, samplestoread, &this->PlaybackState, pDimRgn, pDecompressionBuffer);
49	endofsamplereached = (this->PlaybackState.position >= pSample->SamplesTotal);
50	dmsg(5,("Refilled stream %d with %d (SamplePos: %d)", this->hThis, total_readsamples, this->PlaybackState.position));
51	}
52	else { // normal forward playback
53
54	pSample->SetPos(this->SampleOffset); // recover old position
55
56	do {
57	readsamples = pSample->Read(&pBuf[total_readsamples * pSample->FrameSize], samplestoread, pDecompressionBuffer);
58	samplestoread -= readsamples;
59	total_readsamples += readsamples;
60	} while (samplestoread && readsamples > 0);
61
62	// we have to store the position within the sample, because other streams might use the same sample
63	this->SampleOffset = pSample->GetPos();
64
65	endofsamplereached = (SampleOffset >= pSample->SamplesTotal);
66	dmsg(5,("Refilled stream %d with %d (SamplePos: %d)", this->hThis, total_readsamples, this->SampleOffset));
67	}
68
69	// we must delay the increment_write_ptr_with_wrap() after the while() loop because we need to
70	// ensure that we read exactly SampleCount sample, otherwise the buffer wrapping code will fail
71	pRingBuffer->increment_write_ptr_with_wrap(total_readsamples * pSample->FrameSize);
72
73	// update stream state
74	if (endofsamplereached) SetState(state_end);
75	else SetState(state_active);
76
77	return total_readsamples;
78	}
79
80	void Stream::WriteSilence(unsigned long SilenceSampleWords) {
81	memset(pRingBuffer->get_write_ptr(), 0, SilenceSampleWords * BytesPerSample);
82	pRingBuffer->increment_write_ptr_with_wrap(SilenceSampleWords * BytesPerSample);
83	}
84
85	Stream::Stream( ::gig::buffer_t* pDecompressionBuffer, uint BufferSize, uint BufferWrapElements) {
86	this->pExportReference = NULL;
87	this->State = state_unused;
88	this->hThis = 0;
89	this->pDimRgn = NULL;
90	this->SampleOffset = 0;
91	this->PlaybackState.position = 0;
92	this->PlaybackState.reverse = false;
93	this->pRingBuffer = new RingBuffer<uint8_t,false>(BufferSize * 3, BufferWrapElements * 3);
94	this->pDecompressionBuffer = pDecompressionBuffer;
95	UnusedStreams++;
96	TotalStreams++;
97	}
98
99	Stream::~Stream() {
100	Reset();
101	if (pRingBuffer) delete pRingBuffer;
102	UnusedStreams--;
103	TotalStreams--;
104	}
105
106	/// Called by disk thread to activate the disk stream.
107	void Stream::Launch(Stream::Handle hStream, reference_t* pExportReference, ::gig::DimensionRegion* pDimRgn, unsigned long SampleOffset, bool DoLoop) {
108	UnusedStreams--;
109	this->pExportReference = pExportReference;
110	this->hThis = hStream;
111	this->pDimRgn = pDimRgn;
112	this->SampleOffset = SampleOffset;
113	this->PlaybackState.position = SampleOffset;
114	this->PlaybackState.reverse = false;
115	this->PlaybackState.loop_cycles_left = pDimRgn->pSample->LoopPlayCount;
116	this->DoLoop = DoLoop;
117	BytesPerSample = pDimRgn->pSample->BitDepth / 8;
118	SetState(state_active);
119	}
120
121	}} // namespace LinuxSampler::gig