trunk/src/jackio.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 "jackio.h"

#if HAVE_JACK

JackIO::JackIO() : AudioIO() {
    PendingSamples = 0;
}

int JackIO::Initialize(uint Channels, String OutputPorts[2]) {
    this->uiChannels   = Channels;
    this->bInterleaved = false;

    if ((Client = jack_client_new("LinuxSampler")) == 0) {
        fprintf (stderr, "Seems Jack server not running.\n");
        return -1;
    }

    jack_set_process_callback(Client, __libjack_process_callback, this);
    jack_on_shutdown(Client, __libjack_shutdown_callback, this);

    this->uiMaxSamplesPerCycle = jack_get_buffer_size(Client);
    this->uiSamplerate         = jack_get_sample_rate(Client);
    this->bInitialized         = true;

    // Acquire given output ports
    if(OutputPorts[0] != "")
        if ((this->playback_port[0] = jack_port_by_name(Client, OutputPorts[0].c_str())) == 0)
            fprintf (stderr, "JackIO: Invalid playback port %s.\n", OutputPorts[0].c_str());
    if(OutputPorts[1] != "")
        if ((this->playback_port[1] = jack_port_by_name(Client, OutputPorts[1].c_str())) == 0)
            fprintf (stderr, "JackIO: Invalid playback port %s.\n", OutputPorts[1].c_str());

    return 0;
}

void JackIO::Activate() {
    if (jack_activate(Client)) {
        fprintf (stderr, "JackIO: Cannot activate Jack client, exiting.\n");
        exit(EXIT_FAILURE);
    }

    if ((Ports[0] = jack_port_register(Client, "LinuxSampler:1", JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0)) == 0) {
        fprintf (stderr, "JackIO: Cannot register Jack output port, exiting.\n");
        Close();
        exit(-1);
    }

    if ((Ports[1] = jack_port_register(Client, "LinuxSampler:2", JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0)) == 0) {
        fprintf (stderr, "JackIO: Cannot register Jack output port, exiting.\n");
        Close();
        exit(-1);
    }

    // Connect to given output ports
    if (playback_port[0])
        if (jack_connect(Client, jack_port_name(Ports[0]), jack_port_name(playback_port[0])))
            fprintf (stderr, "JackIO: Cannot connect port 0.\n");
    if (playback_port[1])
        if (jack_connect(Client, jack_port_name(Ports[1]), jack_port_name(playback_port[1])))
            fprintf (stderr, "JackIO: Cannot connect port 1.\n");
}

int JackIO::Process(uint Samples) {
    if (!pEngine) {
        fprintf(stderr, "JackIO: No Sampler Engine assigned, exiting.\n");
        exit(EXIT_FAILURE);
    }
    PendingSamples = Samples;


    // let the engine render audio for the current fragment
    int res = pEngine->RenderAudio(Samples);


    // check clipping (16 bit) in the audio sum and copy to output buffer
    float sample_point;
    for (uint c = 0; c < uiChannels; c++) {
        float* psumbuffer = pEngine->GetAudioSumBuffer(c);
        float* poutput    = (float*) GetChannelOutputBufer(c);
        for (uint s = 0; s < Samples; s++) {
            sample_point = psumbuffer[s] * pEngine->Volume;
            if (sample_point < -32768.0) sample_point = -32768.0;
            if (sample_point >  32767.0) sample_point =  32767.0;
            poutput[s] = sample_point / 32768.0;
        }
    }


    return res;
}

void JackIO::Close() {
    if (bInitialized) {
        jack_client_close (Client);
        bInitialized = false;
    }
}

void* JackIO::GetInterleavedOutputBuffer() {
    fprintf(stderr, "JackIO::GetInterleavedOutputBuffer(): No interleaved access allowed, exiting.\n");
    exit(EXIT_FAILURE);
    // just to avoid compiler warnings
    return NULL;
}

void* JackIO::GetChannelOutputBufer(uint Channel) {
    return (jack_default_audio_sample_t *) jack_port_get_buffer(Ports[Channel], PendingSamples);
}

int __libjack_process_callback(jack_nframes_t nframes, void* arg) {
    JackIO* pJackIO = (JackIO*) arg;
    return pJackIO->Process(nframes);
}

void __libjack_shutdown_callback(void* arg) {
    JackIO* pJackIO = (JackIO*) arg;
    pJackIO->Close();
    fprintf(stderr, "JackIO: Jack server shutdown, exiting.\n");
    exit(EXIT_FAILURE);
}

#endif // HAVE_JACK
1	schoenebeck	31	/***************************************************************************
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 "jackio.h"
24
25			#if HAVE_JACK
26
27			JackIO::JackIO() : AudioIO() {
28			PendingSamples = 0;
29			}
30
31	schoenebeck	33	int JackIO::Initialize(uint Channels, String OutputPorts[2]) {
32	schoenebeck	31	this->uiChannels = Channels;
33			this->bInterleaved = false;
34
35			if ((Client = jack_client_new("LinuxSampler")) == 0) {
36			fprintf (stderr, "Seems Jack server not running.\n");
37			return -1;
38			}
39
40			jack_set_process_callback(Client, __libjack_process_callback, this);
41			jack_on_shutdown(Client, __libjack_shutdown_callback, this);
42
43			this->uiMaxSamplesPerCycle = jack_get_buffer_size(Client);
44			this->uiSamplerate = jack_get_sample_rate(Client);
45			this->bInitialized = true;
46
47	schoenebeck	33	// Acquire given output ports
48			if(OutputPorts[0] != "")
49			if ((this->playback_port[0] = jack_port_by_name(Client, OutputPorts[0].c_str())) == 0)
50			fprintf (stderr, "JackIO: Invalid playback port %s.\n", OutputPorts[0].c_str());
51			if(OutputPorts[1] != "")
52			if ((this->playback_port[1] = jack_port_by_name(Client, OutputPorts[1].c_str())) == 0)
53			fprintf (stderr, "JackIO: Invalid playback port %s.\n", OutputPorts[1].c_str());
54
55	schoenebeck	31	return 0;
56			}
57
58			void JackIO::Activate() {
59			if (jack_activate(Client)) {
60			fprintf (stderr, "JackIO: Cannot activate Jack client, exiting.\n");
61			exit(EXIT_FAILURE);
62			}
63
64			if ((Ports[0] = jack_port_register(Client, "LinuxSampler:1", JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0)) == 0) {
65			fprintf (stderr, "JackIO: Cannot register Jack output port, exiting.\n");
66			Close();
67			exit(-1);
68			}
69
70			if ((Ports[1] = jack_port_register(Client, "LinuxSampler:2", JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0)) == 0) {
71			fprintf (stderr, "JackIO: Cannot register Jack output port, exiting.\n");
72			Close();
73			exit(-1);
74			}
75	schoenebeck	33
76			// Connect to given output ports
77			if (playback_port[0])
78			if (jack_connect(Client, jack_port_name(Ports[0]), jack_port_name(playback_port[0])))
79			fprintf (stderr, "JackIO: Cannot connect port 0.\n");
80			if (playback_port[1])
81			if (jack_connect(Client, jack_port_name(Ports[1]), jack_port_name(playback_port[1])))
82			fprintf (stderr, "JackIO: Cannot connect port 1.\n");
83	schoenebeck	31	}
84
85			int JackIO::Process(uint Samples) {
86			if (!pEngine) {
87			fprintf(stderr, "JackIO: No Sampler Engine assigned, exiting.\n");
88			exit(EXIT_FAILURE);
89			}
90			PendingSamples = Samples;
91
92
93			// let the engine render audio for the current fragment
94			int res = pEngine->RenderAudio(Samples);
95
96
97			// check clipping (16 bit) in the audio sum and copy to output buffer
98			float sample_point;
99			for (uint c = 0; c < uiChannels; c++) {
100			float* psumbuffer = pEngine->GetAudioSumBuffer(c);
101			float* poutput = (float*) GetChannelOutputBufer(c);
102			for (uint s = 0; s < Samples; s++) {
103			sample_point = psumbuffer[s] * pEngine->Volume;
104			if (sample_point < -32768.0) sample_point = -32768.0;
105			if (sample_point > 32767.0) sample_point = 32767.0;
106			poutput[s] = sample_point / 32768.0;
107			}
108			}
109
110
111			return res;
112			}
113
114			void JackIO::Close() {
115			if (bInitialized) {
116			jack_client_close (Client);
117			bInitialized = false;
118			}
119			}
120
121			void* JackIO::GetInterleavedOutputBuffer() {
122			fprintf(stderr, "JackIO::GetInterleavedOutputBuffer(): No interleaved access allowed, exiting.\n");
123			exit(EXIT_FAILURE);
124			// just to avoid compiler warnings
125			return NULL;
126			}
127
128			void* JackIO::GetChannelOutputBufer(uint Channel) {
129			return (jack_default_audio_sample_t *) jack_port_get_buffer(Ports[Channel], PendingSamples);
130			}
131
132			int __libjack_process_callback(jack_nframes_t nframes, void* arg) {
133			JackIO* pJackIO = (JackIO*) arg;
134			return pJackIO->Process(nframes);
135			}
136
137			void __libjack_shutdown_callback(void* arg) {
138			JackIO* pJackIO = (JackIO*) arg;
139			pJackIO->Close();
140			fprintf(stderr, "JackIO: Jack server shutdown, exiting.\n");
141			exit(EXIT_FAILURE);
142			}
143
144			#endif // HAVE_JACK