engines/gig/Stream.cpp

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003,2004 by Benno Senoner and Christian Schoenebeck    *
 *   Copyright (C) 2005-2009 Christian Schoenebeck                         *
 *   Copyright (C) 2009-2015 Christian Schoenebeck and 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                                                   *
 ***************************************************************************/

#include "Stream.h"
#include "../../common/global_private.h"

namespace LinuxSampler { namespace gig {

    Stream::Stream (
        ::gig::buffer_t* pDecompressionBuffer,
        uint             BufferSize,
        uint             BufferWrapElements) : LinuxSampler::StreamBase< ::gig::DimensionRegion>(BufferSize, BufferWrapElements)
    {
        this->pDecompressionBuffer = pDecompressionBuffer;
    }

    long Stream::Read(uint8_t* pBuf, long SamplesToRead) {
        ::gig::Sample* pSample = pRegion->pSample;
        long total_readsamples = 0, readsamples = 0;
        bool endofsamplereached;

        // refill the disk stream buffer
        if (this->DoLoop) { // honor looping
            ::gig::playback_state_t pbs;
            pbs.position = PlaybackState.position;
            pbs.reverse = PlaybackState.reverse;
            pbs.loop_cycles_left = PlaybackState.loop_cycles_left;

            total_readsamples  = pSample->ReadAndLoop(pBuf, SamplesToRead, &pbs, pRegion, pDecompressionBuffer);
            PlaybackState.position = pbs.position;
            PlaybackState.reverse = pbs.reverse;
            PlaybackState.loop_cycles_left = pbs.loop_cycles_left;
            endofsamplereached = (this->PlaybackState.position >= pSample->SamplesTotal);
            dmsg(5,("Refilled stream %d with %ld (SamplePos: %lu)", 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 %ld (SamplePos: %lu)", this->hThis, total_readsamples, this->SampleOffset));
        }

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

        return total_readsamples;
    }

    void Stream::Launch (
        Stream::Handle           hStream,
        reference_t*             pExportReference,
        ::gig::DimensionRegion*  pRgn,
        unsigned long            SampleOffset,
        bool                     DoLoop
    ) {
        SampleDescription info;
        info.ChannelsPerFrame = pRgn->pSample->Channels;
        info.FrameSize        = pRgn->pSample->FrameSize;
        info.BytesPerSample   = pRgn->pSample->BitDepth / 8;
        info.TotalSampleCount = pRgn->pSample->SamplesTotal;

        Sample::PlaybackState playbackState;
        playbackState.position         = SampleOffset;
        playbackState.reverse          = false;
        playbackState.loop_cycles_left = pRgn->pSample->LoopPlayCount;

        LinuxSampler::StreamBase< ::gig::DimensionRegion>::Launch (
            hStream, pExportReference, pRgn, info, playbackState, SampleOffset, DoLoop
        );
    }

}} // 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) 2005-2009 Christian Schoenebeck *
7	* Copyright (C) 2009-2015 Christian Schoenebeck and Grigor Iliev *
8	* *
9	* This program is free software; you can redistribute it and/or modify *
10	* it under the terms of the GNU General Public License as published by *
11	* the Free Software Foundation; either version 2 of the License, or *
12	* (at your option) any later version. *
13	* *
14	* This program is distributed in the hope that it will be useful, *
15	* but WITHOUT ANY WARRANTY; without even the implied warranty of *
16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
17	* GNU General Public License for more details. *
18	* *
19	* You should have received a copy of the GNU General Public License *
20	* along with this program; if not, write to the Free Software *
21	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
22	* MA 02111-1307 USA *
23	***************************************************************************/
24
25	#include "Stream.h"
26	#include "../../common/global_private.h"
27
28	namespace LinuxSampler { namespace gig {
29
30	Stream::Stream (
31	::gig::buffer_t* pDecompressionBuffer,
32	uint BufferSize,
33	uint BufferWrapElements) : LinuxSampler::StreamBase< ::gig::DimensionRegion>(BufferSize, BufferWrapElements)
34	{
35	this->pDecompressionBuffer = pDecompressionBuffer;
36	}
37
38	long Stream::Read(uint8_t* pBuf, long SamplesToRead) {
39	::gig::Sample* pSample = pRegion->pSample;
40	long total_readsamples = 0, readsamples = 0;
41	bool endofsamplereached;
42
43	// refill the disk stream buffer
44	if (this->DoLoop) { // honor looping
45	::gig::playback_state_t pbs;
46	pbs.position = PlaybackState.position;
47	pbs.reverse = PlaybackState.reverse;
48	pbs.loop_cycles_left = PlaybackState.loop_cycles_left;
49
50	total_readsamples = pSample->ReadAndLoop(pBuf, SamplesToRead, &pbs, pRegion, pDecompressionBuffer);
51	PlaybackState.position = pbs.position;
52	PlaybackState.reverse = pbs.reverse;
53	PlaybackState.loop_cycles_left = pbs.loop_cycles_left;
54	endofsamplereached = (this->PlaybackState.position >= pSample->SamplesTotal);
55	dmsg(5,("Refilled stream %d with %ld (SamplePos: %lu)", this->hThis, total_readsamples, this->PlaybackState.position));
56	}
57	else { // normal forward playback
58
59	pSample->SetPos(this->SampleOffset); // recover old position
60
61	do {
62	readsamples = pSample->Read(&pBuf[total_readsamples * pSample->FrameSize], SamplesToRead, pDecompressionBuffer);
63	SamplesToRead -= readsamples;
64	total_readsamples += readsamples;
65	} while (SamplesToRead && readsamples > 0);
66
67	// we have to store the position within the sample, because other streams might use the same sample
68	this->SampleOffset = pSample->GetPos();
69
70	endofsamplereached = (SampleOffset >= pSample->SamplesTotal);
71	dmsg(5,("Refilled stream %d with %ld (SamplePos: %lu)", this->hThis, total_readsamples, this->SampleOffset));
72	}
73
74	// update stream state
75	if (endofsamplereached) SetState(state_end);
76	else SetState(state_active);
77
78	return total_readsamples;
79	}
80
81	void Stream::Launch (
82	Stream::Handle hStream,
83	reference_t* pExportReference,
84	::gig::DimensionRegion* pRgn,
85	unsigned long SampleOffset,
86	bool DoLoop
87	) {
88	SampleDescription info;
89	info.ChannelsPerFrame = pRgn->pSample->Channels;
90	info.FrameSize = pRgn->pSample->FrameSize;
91	info.BytesPerSample = pRgn->pSample->BitDepth / 8;
92	info.TotalSampleCount = pRgn->pSample->SamplesTotal;
93
94	Sample::PlaybackState playbackState;
95	playbackState.position = SampleOffset;
96	playbackState.reverse = false;
97	playbackState.loop_cycles_left = pRgn->pSample->LoopPlayCount;
98
99	LinuxSampler::StreamBase< ::gig::DimensionRegion>::Launch (
100	hStream, pExportReference, pRgn, info, playbackState, SampleOffset, DoLoop
101	);
102	}
103
104	}} // namespace LinuxSampler::gig