tags/start/voice.cpp

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003 by Benno Senoner and 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 "voice.h"

// FIXME: no support for layers (nor crossfades) yet

DiskThread* Voice::pDiskThread = NULL;

Voice::Voice(DiskThread* pDiskThread) {
    Active             = false;
    Voice::pDiskThread = pDiskThread;
}

Voice::~Voice() {
}

void Voice::Trigger(int MIDIKey, uint8_t Velocity, gig::Instrument* Instrument) {
    Active        = true;
    pRegion       = Instrument->GetRegion(MIDIKey);
    PlaybackState = playback_state_ram; // we always start playback from RAM cache and switch then to disk if needed
    Pos           = 0;

    if (!pRegion) {
        std::cerr << "Audio Thread: No Region defined for MIDI key " << MIDIKey << std::endl << std::flush;
        Active = false;
        return;
    }

    //TODO: current MIDI controller values are not taken into account yet
    gig::DimensionRegion* pDimRgn = NULL;
    for (int i = pRegion->Dimensions - 1; i >= 0; i--) { // Check if instrument has a velocity split
        if (pRegion->pDimensionDefinitions[i].dimension == gig::dimension_velocity) {
            uint DimValues[5] = {0,0,0,0,0};
                 DimValues[i] = Velocity;
            pDimRgn = pRegion->GetDimensionRegionByValue(DimValues[4],DimValues[3],DimValues[2],DimValues[1],DimValues[0]);
            break;
        }
    }
    if (!pDimRgn) { // if there was no velocity split
        pDimRgn = pRegion->GetDimensionRegionByValue(0,0,0,0,0);
    }

    pSample = pDimRgn->pSample; // sample won't change until the voice is finished

    // Check if the sample needs disk streaming or is too short for that
    long cachedsamples = pSample->GetCache().Size / pSample->FrameSize;
    DiskVoice          = cachedsamples < pSample->SamplesTotal;

    if (DiskVoice) {
        MaxRAMPos = cachedsamples - (OutputBufferSize << MAX_PITCH) / pSample->Channels;
        pDiskThread->OrderNewStream(&DiskStreamRef, pSample, MaxRAMPos);
        dmsg(("Disk voice launched (cached samples: %d, total Samples: %d, MaxRAMPos: %d\n", cachedsamples, pSample->SamplesTotal, MaxRAMPos));
    }
    else {
        MaxRAMPos = cachedsamples;
        dmsg(("RAM only voice launched\n"));
    }

    CurrentPitch = pow(2, (double) (MIDIKey - (int) pSample->MIDIUnityNote) / (double) 12);

    // ************************************************
    // TODO: ARTICULATION DATA HANDLING IS MISSING HERE
    // ************************************************
}

void Voice::RenderAudio() {

    switch (this->PlaybackState) {

        case playback_state_ram: {
                Interpolate((sample_t*) pSample->GetCache().pStart);
                if (DiskVoice) {
                    // check if we reached the allowed limit of the sample RAM cache
                    if (Pos > MaxRAMPos) {
                        dmsg(("Voice: switching to disk playback (Pos=%f)\n", Pos));
                        this->PlaybackState = playback_state_disk;
                    }
                }
                else if (Pos >= pSample->GetCache().Size / pSample->FrameSize) {
                    this->PlaybackState = playback_state_end;
                }
            }
            break;

        case playback_state_disk: {
                if (!DiskStreamRef.pStream) {
                    // check if the disk thread created our ordered disk stream in the meantime
                    DiskStreamRef.pStream = pDiskThread->AskForCreatedStream(DiskStreamRef.OrderID);
                    if (!DiskStreamRef.pStream) {
                        std::cout << stderr << "Disk stream not available in time!" << std::endl << std::flush;
                        pDiskThread->OrderDeletionOfStream(&DiskStreamRef);
                        this->Active = false;
                        return;
                    }
                    DiskStreamRef.pStream->IncrementReadPos(pSample->Channels * (double_to_int(Pos) - MaxRAMPos));
                    Pos -= double_to_int(Pos);
                }

                // add silence sample at the end if we reached the end of the stream (for the interpolator)
                if (DiskStreamRef.State == Stream::state_end && DiskStreamRef.pStream->GetReadSpace() < (OutputBufferSize << MAX_PITCH) / pSample->Channels) {
                    DiskStreamRef.pStream->WriteSilence((OutputBufferSize << MAX_PITCH) / pSample->Channels);
                    this->PlaybackState = playback_state_end;
                }

                sample_t* ptr = DiskStreamRef.pStream->GetReadPtr(); // get the current read_ptr within the ringbuffer where we read the samples from
                Interpolate(ptr);
                DiskStreamRef.pStream->IncrementReadPos(double_to_int(Pos) * pSample->Channels);
                Pos -= double_to_int(Pos);
            }
            break;

        case playback_state_end:
            this->Active = false; // free voice
            break;
    }
}

void Voice::Interpolate(sample_t* pSrc) {
    float effective_volume = 1;  // TODO: use the art. data instead
    int   i = 0;

    // ************************************************
    // TODO: ARTICULATION DATA HANDLING IS MISSING HERE
    // ************************************************

    // FIXME: assuming either mono or stereo
    if (this->pSample->Channels == 2) { // Stereo Sample
        while (i < this->OutputBufferSize) {
            #ifdef USE_LINEAR_INTERPOLATION
                int   pos_int   = double_to_int(this->Pos);  // integer position
                float pos_fract = this->Pos - pos_int;       // fractional part of position
                pos_int <<= 1;
                // left channel
                this->pOutput[i++] += effective_volume * (pSrc[pos_int]   + pos_fract * (pSrc[pos_int+2] - pSrc[pos_int]));
                // right channel
                this->pOutput[i++] += effective_volume * (pSrc[pos_int+1] + pos_fract * (pSrc[pos_int+3] - pSrc[pos_int+1]));
            #else // polynomial interpolation
                //FIXME: !!!THIS WON'T WORK!!! needs to be adjusted for stereo, use linear interpolation meanwhile
                xm1 = pSrc[pos_int];
                x0  = pSrc[pos_int+1];
                x1  = pSrc[pos_int+2];
                x2  = pSrc[pos_int+3];
                a   = (3 * (x0-x1) - xm1 + x2) / 2;
                b   = 2 * x1 + xm1 - (5 * x0 + x2) / 2;
                c   = (x1 - xm1) / 2;
                this->pOutput[u] += effective_volume*((((a * pos_fract) + b) * pos_fract + c) * pos_fract + x0);
            #endif // USE_LINEAR_INTERPOLATION

            this->Pos += this->CurrentPitch;
        }
    }
    else { // Mono Sample
        while (i < this->OutputBufferSize) {
            #ifdef USE_LINEAR_INTERPOLATION
                int   pos_int       = double_to_int(this->Pos);  // integer position
                float pos_fract     = this->Pos - pos_int;       // fractional part of position
                float sample_point  = effective_volume * (pSrc[pos_int] + pos_fract * (pSrc[pos_int+1] - pSrc[pos_int]));
                this->pOutput[i]   += sample_point;
                this->pOutput[i+1] += sample_point;
                i += 2;
            #else // polynomial interpolation
                //FIXME: !!!THIS WON'T WORK!!! needs to be adjusted for stereo, use linear interpolation meanwhile
                xm1 = pSrc[pos_int];
                x0  = pSrc[pos_int+1];
                x1  = pSrc[pos_int+2];
                x2  = pSrc[pos_int+3];
                a   = (3 * (x0-x1) - xm1 + x2) / 2;
                b   = 2 * x1 + xm1 - (5 * x0 + x2) / 2;
                c   = (x1 - xm1) / 2;
               this->pOutput[u] += effective_volume*((((a * pos_fract) + b) * pos_fract + c) * pos_fract + x0);
            #endif

            this->Pos += this->CurrentPitch;
        }
    }
}

void Voice::Kill() {
    if (DiskVoice && DiskStreamRef.State != Stream::state_unused) {
        pDiskThread->OrderDeletionOfStream(&DiskStreamRef);
    }
    Active = false;
}
1	schoenebeck	5	/***************************************************************************
2			* *
3			* LinuxSampler - modular, streaming capable sampler *
4			* *
5			* Copyright (C) 2003 by Benno Senoner and Christian Schoenebeck *
6			* *
7			* This program is free software; you can redistribute it and/or modify *
8			* it under the terms of the GNU General Public License as published by *
9			* the Free Software Foundation; either version 2 of the License, or *
10			* (at your option) any later version. *
11			* *
12			* This program is distributed in the hope that it will be useful, *
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of *
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
15			* GNU General Public License for more details. *
16			* *
17			* You should have received a copy of the GNU General Public License *
18			* along with this program; if not, write to the Free Software *
19			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
20			* MA 02111-1307 USA *
21			***************************************************************************/
22
23			#include "voice.h"
24
25			// FIXME: no support for layers (nor crossfades) yet
26
27			DiskThread* Voice::pDiskThread = NULL;
28
29			Voice::Voice(DiskThread* pDiskThread) {
30			Active = false;
31			Voice::pDiskThread = pDiskThread;
32			}
33
34			Voice::~Voice() {
35			}
36
37			void Voice::Trigger(int MIDIKey, uint8_t Velocity, gig::Instrument* Instrument) {
38			Active = true;
39			pRegion = Instrument->GetRegion(MIDIKey);
40			PlaybackState = playback_state_ram; // we always start playback from RAM cache and switch then to disk if needed
41			Pos = 0;
42
43			if (!pRegion) {
44			std::cerr << "Audio Thread: No Region defined for MIDI key " << MIDIKey << std::endl << std::flush;
45			Active = false;
46			return;
47			}
48
49			//TODO: current MIDI controller values are not taken into account yet
50			gig::DimensionRegion* pDimRgn = NULL;
51			for (int i = pRegion->Dimensions - 1; i >= 0; i--) { // Check if instrument has a velocity split
52			if (pRegion->pDimensionDefinitions[i].dimension == gig::dimension_velocity) {
53			uint DimValues[5] = {0,0,0,0,0};
54			DimValues[i] = Velocity;
55			pDimRgn = pRegion->GetDimensionRegionByValue(DimValues[4],DimValues[3],DimValues[2],DimValues[1],DimValues[0]);
56			break;
57			}
58			}
59			if (!pDimRgn) { // if there was no velocity split
60			pDimRgn = pRegion->GetDimensionRegionByValue(0,0,0,0,0);
61			}
62
63			pSample = pDimRgn->pSample; // sample won't change until the voice is finished
64
65			// Check if the sample needs disk streaming or is too short for that
66			long cachedsamples = pSample->GetCache().Size / pSample->FrameSize;
67			DiskVoice = cachedsamples < pSample->SamplesTotal;
68
69			if (DiskVoice) {
70			MaxRAMPos = cachedsamples - (OutputBufferSize << MAX_PITCH) / pSample->Channels;
71			pDiskThread->OrderNewStream(&DiskStreamRef, pSample, MaxRAMPos);
72			dmsg(("Disk voice launched (cached samples: %d, total Samples: %d, MaxRAMPos: %d\n", cachedsamples, pSample->SamplesTotal, MaxRAMPos));
73			}
74			else {
75			MaxRAMPos = cachedsamples;
76			dmsg(("RAM only voice launched\n"));
77			}
78
79			CurrentPitch = pow(2, (double) (MIDIKey - (int) pSample->MIDIUnityNote) / (double) 12);
80
81			// ************************************************
82			// TODO: ARTICULATION DATA HANDLING IS MISSING HERE
83			// ************************************************
84			}
85
86			void Voice::RenderAudio() {
87
88			switch (this->PlaybackState) {
89
90			case playback_state_ram: {
91			Interpolate((sample_t*) pSample->GetCache().pStart);
92			if (DiskVoice) {
93			// check if we reached the allowed limit of the sample RAM cache
94			if (Pos > MaxRAMPos) {
95			dmsg(("Voice: switching to disk playback (Pos=%f)\n", Pos));
96			this->PlaybackState = playback_state_disk;
97			}
98			}
99			else if (Pos >= pSample->GetCache().Size / pSample->FrameSize) {
100			this->PlaybackState = playback_state_end;
101			}
102			}
103			break;
104
105			case playback_state_disk: {
106			if (!DiskStreamRef.pStream) {
107			// check if the disk thread created our ordered disk stream in the meantime
108			DiskStreamRef.pStream = pDiskThread->AskForCreatedStream(DiskStreamRef.OrderID);
109			if (!DiskStreamRef.pStream) {
110			std::cout << stderr << "Disk stream not available in time!" << std::endl << std::flush;
111			pDiskThread->OrderDeletionOfStream(&DiskStreamRef);
112			this->Active = false;
113			return;
114			}
115			DiskStreamRef.pStream->IncrementReadPos(pSample->Channels * (double_to_int(Pos) - MaxRAMPos));
116			Pos -= double_to_int(Pos);
117			}
118
119			// add silence sample at the end if we reached the end of the stream (for the interpolator)
120			if (DiskStreamRef.State == Stream::state_end && DiskStreamRef.pStream->GetReadSpace() < (OutputBufferSize << MAX_PITCH) / pSample->Channels) {
121			DiskStreamRef.pStream->WriteSilence((OutputBufferSize << MAX_PITCH) / pSample->Channels);
122			this->PlaybackState = playback_state_end;
123			}
124
125			sample_t* ptr = DiskStreamRef.pStream->GetReadPtr(); // get the current read_ptr within the ringbuffer where we read the samples from
126			Interpolate(ptr);
127			DiskStreamRef.pStream->IncrementReadPos(double_to_int(Pos) * pSample->Channels);
128			Pos -= double_to_int(Pos);
129			}
130			break;
131
132			case playback_state_end:
133			this->Active = false; // free voice
134			break;
135			}
136			}
137
138			void Voice::Interpolate(sample_t* pSrc) {
139			float effective_volume = 1; // TODO: use the art. data instead
140			int i = 0;
141
142			// ************************************************
143			// TODO: ARTICULATION DATA HANDLING IS MISSING HERE
144			// ************************************************
145
146			// FIXME: assuming either mono or stereo
147			if (this->pSample->Channels == 2) { // Stereo Sample
148			while (i < this->OutputBufferSize) {
149			#ifdef USE_LINEAR_INTERPOLATION
150			int pos_int = double_to_int(this->Pos); // integer position
151			float pos_fract = this->Pos - pos_int; // fractional part of position
152			pos_int <<= 1;
153			// left channel
154			this->pOutput[i++] += effective_volume * (pSrc[pos_int] + pos_fract * (pSrc[pos_int+2] - pSrc[pos_int]));
155			// right channel
156			this->pOutput[i++] += effective_volume * (pSrc[pos_int+1] + pos_fract * (pSrc[pos_int+3] - pSrc[pos_int+1]));
157			#else // polynomial interpolation
158			//FIXME: !!!THIS WON'T WORK!!! needs to be adjusted for stereo, use linear interpolation meanwhile
159			xm1 = pSrc[pos_int];
160			x0 = pSrc[pos_int+1];
161			x1 = pSrc[pos_int+2];
162			x2 = pSrc[pos_int+3];
163			a = (3 * (x0-x1) - xm1 + x2) / 2;
164			b = 2 * x1 + xm1 - (5 * x0 + x2) / 2;
165			c = (x1 - xm1) / 2;
166			this->pOutput[u] += effective_volume((((a pos_fract) + b) * pos_fract + c) * pos_fract + x0);
167			#endif // USE_LINEAR_INTERPOLATION
168
169			this->Pos += this->CurrentPitch;
170			}
171			}
172			else { // Mono Sample
173			while (i < this->OutputBufferSize) {
174			#ifdef USE_LINEAR_INTERPOLATION
175			int pos_int = double_to_int(this->Pos); // integer position
176			float pos_fract = this->Pos - pos_int; // fractional part of position
177			float sample_point = effective_volume * (pSrc[pos_int] + pos_fract * (pSrc[pos_int+1] - pSrc[pos_int]));
178			this->pOutput[i] += sample_point;
179			this->pOutput[i+1] += sample_point;
180			i += 2;
181			#else // polynomial interpolation
182			//FIXME: !!!THIS WON'T WORK!!! needs to be adjusted for stereo, use linear interpolation meanwhile
183			xm1 = pSrc[pos_int];
184			x0 = pSrc[pos_int+1];
185			x1 = pSrc[pos_int+2];
186			x2 = pSrc[pos_int+3];
187			a = (3 * (x0-x1) - xm1 + x2) / 2;
188			b = 2 * x1 + xm1 - (5 * x0 + x2) / 2;
189			c = (x1 - xm1) / 2;
190			this->pOutput[u] += effective_volume((((a pos_fract) + b) * pos_fract + c) * pos_fract + x0);
191			#endif
192
193			this->Pos += this->CurrentPitch;
194			}
195			}
196			}
197
198			void Voice::Kill() {
199			if (DiskVoice && DiskStreamRef.State != Stream::state_unused) {
200			pDiskThread->OrderDeletionOfStream(&DiskStreamRef);
201			}
202			Active = false;
203			}