engines/gig/Stream.cpp

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003,2004 by Benno Senoner and Christian Schoenebeck    *
 *   Copyright (C) 2005-2021 Christian Schoenebeck                         *
 *   Copyright (C) 2009 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 = (int)pRgn->pSample->SamplesTotal;

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

        // assuming libgig's file-IO-per-thread feature is enabled: by default
        // the file stream is closed for this thread, so open it for being able
        // to read the .gig file (see libgig's RIFF::File::SetIOPerThread() for
        // details)
        ::gig::File* gig = (::gig::File*) pRgn->pSample->GetParent();
        ::RIFF::File* riff = gig->GetRiffFile();
        if (riff->GetMode() == ::RIFF::stream_mode_closed) {
            try {
                riff->SetMode(::RIFF::stream_mode_read);
            } catch (...) {
                dmsg(1,("Failed opening disk stream\n"));
            }
        }

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

}} // namespace LinuxSampler::gig
1	schoenebeck	53	/***************************************************************************
2			* *
3			* LinuxSampler - modular, streaming capable sampler *
4			* *
5	iliev	2012	* Copyright (C) 2003,2004 by Benno Senoner and Christian Schoenebeck *
6	schoenebeck	3917	* Copyright (C) 2005-2021 Christian Schoenebeck *
7			* Copyright (C) 2009 Grigor Iliev *
8	schoenebeck	53	* *
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	schoenebeck	1424	#include "../../common/global_private.h"
27
28	schoenebeck	53	namespace LinuxSampler { namespace gig {
29
30	iliev	2012	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	schoenebeck	53
38	iliev	2012	long Stream::Read(uint8_t* pBuf, long SamplesToRead) {
39			::gig::Sample* pSample = pRegion->pSample;
40	schoenebeck	53	long total_readsamples = 0, readsamples = 0;
41			bool endofsamplereached;
42
43			// refill the disk stream buffer
44			if (this->DoLoop) { // honor looping
45	iliev	2012	::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	schoenebeck	53	endofsamplereached = (this->PlaybackState.position >= pSample->SamplesTotal);
55	persson	2837	dmsg(5,("Refilled stream %d with %ld (SamplePos: %lu)", this->hThis, total_readsamples, this->PlaybackState.position));
56	schoenebeck	53	}
57			else { // normal forward playback
58
59			pSample->SetPos(this->SampleOffset); // recover old position
60
61			do {
62	iliev	2012	readsamples = pSample->Read(&pBuf[total_readsamples * pSample->FrameSize], SamplesToRead, pDecompressionBuffer);
63			SamplesToRead -= readsamples;
64	schoenebeck	53	total_readsamples += readsamples;
65	iliev	2012	} while (SamplesToRead && readsamples > 0);
66	schoenebeck	53
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	persson	2837	dmsg(5,("Refilled stream %d with %ld (SamplePos: %lu)", this->hThis, total_readsamples, this->SampleOffset));
72	schoenebeck	53	}
73
74			// update stream state
75			if (endofsamplereached) SetState(state_end);
76			else SetState(state_active);
77
78			return total_readsamples;
79			}
80
81	iliev	2012	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	schoenebeck	3054	info.TotalSampleCount = (int)pRgn->pSample->SamplesTotal;
93	schoenebeck	53
94	iliev	2012	Sample::PlaybackState playbackState;
95			playbackState.position = SampleOffset;
96			playbackState.reverse = false;
97			playbackState.loop_cycles_left = pRgn->pSample->LoopPlayCount;
98	schoenebeck	53
99	schoenebeck	3917	// assuming libgig's file-IO-per-thread feature is enabled: by default
100			// the file stream is closed for this thread, so open it for being able
101			// to read the .gig file (see libgig's RIFF::File::SetIOPerThread() for
102			// details)
103			::gig::File* gig = (::gig::File*) pRgn->pSample->GetParent();
104			::RIFF::File* riff = gig->GetRiffFile();
105			if (riff->GetMode() == ::RIFF::stream_mode_closed) {
106			try {
107			riff->SetMode(::RIFF::stream_mode_read);
108			} catch (...) {
109			dmsg(1,("Failed opening disk stream\n"));
110			}
111			}
112
113	iliev	2012	LinuxSampler::StreamBase< ::gig::DimensionRegion>::Launch (
114			hStream, pExportReference, pRgn, info, playbackState, SampleOffset, DoLoop
115			);
116	schoenebeck	53	}
117
118			}} // namespace LinuxSampler::gig