trunk/src/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() {
}

/**
 *  Initializes and triggers the voice, a disk stream will be launched if
 *  needed.
 *
 *  @returns  0 on success, a value < 0 if something failed
 */
int Voice::Trigger(int MIDIKey, uint8_t Velocity, gig::Instrument* Instrument) {
    Active          = true;
    this->MIDIKey   = MIDIKey;
    pRegion         = Instrument->GetRegion(MIDIKey);
    PlaybackState   = playback_state_ram; // we always start playback from RAM cache and switch then to disk if needed
    Pos             = 0;
    ReleaseVelocity = 127; // default release velocity value

    if (!pRegion) {
        std::cerr << "Audio Thread: No Region defined for MIDI key " << MIDIKey << std::endl << std::flush;
        Kill();
        return -1;
    }

    //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;
        if (pDiskThread->OrderNewStream(&DiskStreamRef, pSample, MaxRAMPos) < 0) {
            dmsg(1,("Disk stream order failed!\n"));
            Kill();
            return -1;
        }
        dmsg(5,("Disk voice launched (cached samples: %d, total Samples: %d, MaxRAMPos: %d\n", cachedsamples, pSample->SamplesTotal, MaxRAMPos));
    }
    else {
        MaxRAMPos = cachedsamples;
        dmsg(5,("RAM only voice launched\n"));
    }

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

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

    return 0; // success
}

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(5,("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;
                        Kill();
                        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:
            Kill(); // free voice
            break;
    }
}

void Voice::Interpolate(sample_t* pSrc) {
    float effective_volume = this->Volume;
    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) {
            int   pos_int   = double_to_int(this->Pos);  // integer position
            float pos_fract = this->Pos - pos_int;       // fractional part of position
            pos_int <<= 1;

            #if USE_LINEAR_INTERPOLATION
                // 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
                // calculate left channel
                float xm1 = pSrc[pos_int];
                float x0  = pSrc[pos_int+2];
                float x1  = pSrc[pos_int+4];
                float x2  = pSrc[pos_int+6];
                float a   = (3 * (x0 - x1) - xm1 + x2) / 2;
                float b   = 2 * x1 + xm1 - (5 * x0 + x2) / 2;
                float c   = (x1 - xm1) / 2;
                this->pOutput[i++] += effective_volume * ((((a * pos_fract) + b) * pos_fract + c) * pos_fract + x0);

                //calculate right channel
                xm1 = pSrc[pos_int+1];
                x0  = pSrc[pos_int+3];
                x1  = pSrc[pos_int+5];
                x2  = pSrc[pos_int+7];
                a   = (3 * (x0 - x1) - xm1 + x2) / 2;
                b   = 2 * x1 + xm1 - (5 * x0 + x2) / 2;
                c   = (x1 - xm1) / 2;
                this->pOutput[i++] += 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) {
            int   pos_int   = double_to_int(this->Pos);  // integer position
            float pos_fract = this->Pos - pos_int;       // fractional part of position

            #if USE_LINEAR_INTERPOLATION
                float sample_point  = effective_volume * (pSrc[pos_int] + pos_fract * (pSrc[pos_int+1] - pSrc[pos_int]));
            #else // polynomial interpolation
                float xm1 = pSrc[pos_int];
                float x0  = pSrc[pos_int+1];
                float x1  = pSrc[pos_int+2];
                float x2  = pSrc[pos_int+3];
                float a   = (3 * (x0 - x1) - xm1 + x2) / 2;
                float b   = 2 * x1 + xm1 - (5 * x0 + x2) / 2;
                float c   = (x1 - xm1) / 2;
                float sample_point = effective_volume * ((((a * pos_fract) + b) * pos_fract + c) * pos_fract + x0);
            #endif // USE_LINEAR_INTERPOLATION

            this->pOutput[i++] += sample_point;
            this->pOutput[i++] += sample_point;

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

void Voice::Kill() {
    if (DiskVoice && DiskStreamRef.State != Stream::state_unused) {
        pDiskThread->OrderDeletionOfStream(&DiskStreamRef);
    }
    DiskStreamRef.pStream = NULL;
    DiskStreamRef.hStream = 0;
    DiskStreamRef.State   = Stream::state_unused;
    DiskStreamRef.OrderID = 0;
    Active = false;
}
1	/***************************************************************************
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	/**
38	* Initializes and triggers the voice, a disk stream will be launched if
39	* needed.
40	*
41	* @returns 0 on success, a value < 0 if something failed
42	*/
43	int Voice::Trigger(int MIDIKey, uint8_t Velocity, gig::Instrument* Instrument) {
44	Active = true;
45	this->MIDIKey = MIDIKey;
46	pRegion = Instrument->GetRegion(MIDIKey);
47	PlaybackState = playback_state_ram; // we always start playback from RAM cache and switch then to disk if needed
48	Pos = 0;
49	ReleaseVelocity = 127; // default release velocity value
50
51	if (!pRegion) {
52	std::cerr << "Audio Thread: No Region defined for MIDI key " << MIDIKey << std::endl << std::flush;
53	Kill();
54	return -1;
55	}
56
57	//TODO: current MIDI controller values are not taken into account yet
58	gig::DimensionRegion* pDimRgn = NULL;
59	for (int i = pRegion->Dimensions - 1; i >= 0; i--) { // Check if instrument has a velocity split
60	if (pRegion->pDimensionDefinitions[i].dimension == gig::dimension_velocity) {
61	uint DimValues[5] = {0,0,0,0,0};
62	DimValues[i] = Velocity;
63	pDimRgn = pRegion->GetDimensionRegionByValue(DimValues[4],DimValues[3],DimValues[2],DimValues[1],DimValues[0]);
64	break;
65	}
66	}
67	if (!pDimRgn) { // if there was no velocity split
68	pDimRgn = pRegion->GetDimensionRegionByValue(0,0,0,0,0);
69	}
70
71	pSample = pDimRgn->pSample; // sample won't change until the voice is finished
72
73	// Check if the sample needs disk streaming or is too short for that
74	long cachedsamples = pSample->GetCache().Size / pSample->FrameSize;
75	DiskVoice = cachedsamples < pSample->SamplesTotal;
76
77	if (DiskVoice) {
78	MaxRAMPos = cachedsamples - (OutputBufferSize << MAX_PITCH) / pSample->Channels;
79	if (pDiskThread->OrderNewStream(&DiskStreamRef, pSample, MaxRAMPos) < 0) {
80	dmsg(1,("Disk stream order failed!\n"));
81	Kill();
82	return -1;
83	}
84	dmsg(5,("Disk voice launched (cached samples: %d, total Samples: %d, MaxRAMPos: %d\n", cachedsamples, pSample->SamplesTotal, MaxRAMPos));
85	}
86	else {
87	MaxRAMPos = cachedsamples;
88	dmsg(5,("RAM only voice launched\n"));
89	}
90
91	CurrentPitch = pow(2, (double) (MIDIKey - (int) pSample->MIDIUnityNote) / (double) 12);
92	Volume = pDimRgn->GetVelocityAttenuation(Velocity);
93
94	// ************************************************
95	// TODO: ARTICULATION DATA HANDLING IS MISSING HERE
96	// ************************************************
97
98	return 0; // success
99	}
100
101	void Voice::RenderAudio() {
102
103	switch (this->PlaybackState) {
104
105	case playback_state_ram: {
106	Interpolate((sample_t*) pSample->GetCache().pStart);
107	if (DiskVoice) {
108	// check if we reached the allowed limit of the sample RAM cache
109	if (Pos > MaxRAMPos) {
110	dmsg(5,("Voice: switching to disk playback (Pos=%f)\n", Pos));
111	this->PlaybackState = playback_state_disk;
112	}
113	}
114	else if (Pos >= pSample->GetCache().Size / pSample->FrameSize) {
115	this->PlaybackState = playback_state_end;
116	}
117	}
118	break;
119
120	case playback_state_disk: {
121	if (!DiskStreamRef.pStream) {
122	// check if the disk thread created our ordered disk stream in the meantime
123	DiskStreamRef.pStream = pDiskThread->AskForCreatedStream(DiskStreamRef.OrderID);
124	if (!DiskStreamRef.pStream) {
125	std::cout << stderr << "Disk stream not available in time!" << std::endl << std::flush;
126	Kill();
127	return;
128	}
129	DiskStreamRef.pStream->IncrementReadPos(pSample->Channels * (double_to_int(Pos) - MaxRAMPos));
130	Pos -= double_to_int(Pos);
131	}
132
133	// add silence sample at the end if we reached the end of the stream (for the interpolator)
134	if (DiskStreamRef.State == Stream::state_end && DiskStreamRef.pStream->GetReadSpace() < (OutputBufferSize << MAX_PITCH) / pSample->Channels) {
135	DiskStreamRef.pStream->WriteSilence((OutputBufferSize << MAX_PITCH) / pSample->Channels);
136	this->PlaybackState = playback_state_end;
137	}
138
139	sample_t* ptr = DiskStreamRef.pStream->GetReadPtr(); // get the current read_ptr within the ringbuffer where we read the samples from
140	Interpolate(ptr);
141	DiskStreamRef.pStream->IncrementReadPos(double_to_int(Pos) * pSample->Channels);
142	Pos -= double_to_int(Pos);
143	}
144	break;
145
146	case playback_state_end:
147	Kill(); // free voice
148	break;
149	}
150	}
151
152	void Voice::Interpolate(sample_t* pSrc) {
153	float effective_volume = this->Volume;
154	int i = 0;
155
156	// ************************************************
157	// TODO: ARTICULATION DATA HANDLING IS MISSING HERE
158	// ************************************************
159
160	// FIXME: assuming either mono or stereo
161	if (this->pSample->Channels == 2) { // Stereo Sample
162	while (i < this->OutputBufferSize) {
163	int pos_int = double_to_int(this->Pos); // integer position
164	float pos_fract = this->Pos - pos_int; // fractional part of position
165	pos_int <<= 1;
166
167	#if USE_LINEAR_INTERPOLATION
168	// left channel
169	this->pOutput[i++] += effective_volume * (pSrc[pos_int] + pos_fract * (pSrc[pos_int+2] - pSrc[pos_int]));
170	// right channel
171	this->pOutput[i++] += effective_volume * (pSrc[pos_int+1] + pos_fract * (pSrc[pos_int+3] - pSrc[pos_int+1]));
172	#else // polynomial interpolation
173	// calculate left channel
174	float xm1 = pSrc[pos_int];
175	float x0 = pSrc[pos_int+2];
176	float x1 = pSrc[pos_int+4];
177	float x2 = pSrc[pos_int+6];
178	float a = (3 * (x0 - x1) - xm1 + x2) / 2;
179	float b = 2 * x1 + xm1 - (5 * x0 + x2) / 2;
180	float c = (x1 - xm1) / 2;
181	this->pOutput[i++] += effective_volume * ((((a * pos_fract) + b) * pos_fract + c) * pos_fract + x0);
182
183	//calculate right channel
184	xm1 = pSrc[pos_int+1];
185	x0 = pSrc[pos_int+3];
186	x1 = pSrc[pos_int+5];
187	x2 = pSrc[pos_int+7];
188	a = (3 * (x0 - x1) - xm1 + x2) / 2;
189	b = 2 * x1 + xm1 - (5 * x0 + x2) / 2;
190	c = (x1 - xm1) / 2;
191	this->pOutput[i++] += effective_volume * ((((a * pos_fract) + b) * pos_fract + c) * pos_fract + x0);
192	#endif // USE_LINEAR_INTERPOLATION
193
194	this->Pos += this->CurrentPitch;
195	}
196	}
197	else { // Mono Sample
198	while (i < this->OutputBufferSize) {
199	int pos_int = double_to_int(this->Pos); // integer position
200	float pos_fract = this->Pos - pos_int; // fractional part of position
201
202	#if USE_LINEAR_INTERPOLATION
203	float sample_point = effective_volume * (pSrc[pos_int] + pos_fract * (pSrc[pos_int+1] - pSrc[pos_int]));
204	#else // polynomial interpolation
205	float xm1 = pSrc[pos_int];
206	float x0 = pSrc[pos_int+1];
207	float x1 = pSrc[pos_int+2];
208	float x2 = pSrc[pos_int+3];
209	float a = (3 * (x0 - x1) - xm1 + x2) / 2;
210	float b = 2 * x1 + xm1 - (5 * x0 + x2) / 2;
211	float c = (x1 - xm1) / 2;
212	float sample_point = effective_volume * ((((a * pos_fract) + b) * pos_fract + c) * pos_fract + x0);
213	#endif // USE_LINEAR_INTERPOLATION
214
215	this->pOutput[i++] += sample_point;
216	this->pOutput[i++] += sample_point;
217
218	this->Pos += this->CurrentPitch;
219	}
220	}
221	}
222
223	void Voice::Kill() {
224	if (DiskVoice && DiskStreamRef.State != Stream::state_unused) {
225	pDiskThread->OrderDeletionOfStream(&DiskStreamRef);
226	}
227	DiskStreamRef.pStream = NULL;
228	DiskStreamRef.hStream = 0;
229	DiskStreamRef.State = Stream::state_unused;
230	DiskStreamRef.OrderID = 0;
231	Active = false;
232	}