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/*************************************************************************** |
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* * |
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* LinuxSampler - modular, streaming capable sampler * |
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* * |
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* Copyright (C) 2003 by Benno Senoner and Christian Schoenebeck * |
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* * |
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* This program is free software; you can redistribute it and/or modify * |
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* it under the terms of the GNU General Public License as published by * |
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* the Free Software Foundation; either version 2 of the License, or * |
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* (at your option) any later version. * |
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* * |
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* This program is distributed in the hope that it will be useful, * |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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* GNU General Public License for more details. * |
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* * |
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* You should have received a copy of the GNU General Public License * |
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* along with this program; if not, write to the Free Software * |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, * |
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* MA 02111-1307 USA * |
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***************************************************************************/ |
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|
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#include "AudioOutputDeviceJack.h" |
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|
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#if HAVE_JACK |
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|
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namespace LinuxSampler { |
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|
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/** |
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* Open and initialize connection to the JACK system. The two arguments |
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* are optional; they allow auto connection to already existing Jack |
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* playback ports. If there are no playback ports to which we should |
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* autoconnect to, then no output ports will be created and the |
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* AcquireChannels() method has to be called to order a minimum amount |
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* of output channels which will then be created. |
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* |
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* @param AutoConnectPortIDs - (optional) array of Jack IDs of ports to |
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* which we should autoconnect to |
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* @param AutoConnectPorts - (optional) size of the AutoConnectPortIDs |
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* array |
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* @throws AudioOutputException on error |
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* @see AcquireChannels() |
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*/ |
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AudioOutputDeviceJack::AudioOutputDeviceJack(String* AutoConnectPortIDs, uint AutoConnectPorts) : AudioOutputDevice() { |
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if ((hJackClient = jack_client_new("LinuxSampler")) == 0) |
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throw AudioOutputException("Seems Jack server not running."); |
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|
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jack_set_process_callback(hJackClient, __libjack_process_callback, this); |
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jack_on_shutdown(hJackClient, __libjack_shutdown_callback, this); |
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if (jack_activate(hJackClient)) |
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throw AudioOutputException("Jack: Cannot activate Jack client."); |
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|
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uiMaxSamplesPerCycle = jack_get_buffer_size(hJackClient); |
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|
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// create amount of audio channels and jack output ports we need for autoconnect |
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for (uint p = 0; p < AutoConnectPorts; p++) { |
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// create jack output port |
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std::stringstream portid; portid << "LinuxSampler:" << p; |
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jack_port_t* newport; |
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if (newport = jack_port_register(hJackClient, portid.str().c_str(), JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0)) { |
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hJackPorts.push_back(newport); |
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} |
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else throw AudioOutputException("Jack: Cannot register Jack output port."); |
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|
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// create LS audio channel |
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std::stringstream chanid; chanid << "Jack:" << p; |
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Channels.push_back(new AudioChannel((float*) jack_port_get_buffer(newport, uiMaxSamplesPerCycle), uiMaxSamplesPerCycle, chanid.str())); |
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|
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// autoconnect port |
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if (jack_connect(hJackClient, portid.str().c_str(), AutoConnectPortIDs[p].c_str())) { |
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std::stringstream err; err << "Jack: Cannot auto connect port " << p; |
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throw AudioOutputException(err.str()); |
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} |
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} |
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} |
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|
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AudioOutputDeviceJack::~AudioOutputDeviceJack() { |
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// destroy all audio channels |
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for (int c = 0; c < Channels.size(); c++) delete Channels[c]; |
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// destroy jack client |
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jack_client_close(hJackClient); |
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} |
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|
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/** |
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* This method should not be called directly! It will be called by |
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* libjack to demand transmission of further sample points. |
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*/ |
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int AudioOutputDeviceJack::Process(uint Samples) { |
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if (csIsPlaying.Pop()) { |
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// let all connected engines render 'Samples' sample points |
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return RenderAudio(Samples); |
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} |
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else { |
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// playback stop by zeroing output buffer(s) and not calling connected sampler engines to render audio |
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return RenderSilence(Samples); |
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} |
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} |
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|
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void AudioOutputDeviceJack::Play() { |
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csIsPlaying.PushAndUnlock(true); |
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} |
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|
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bool AudioOutputDeviceJack::IsPlaying() { |
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csIsPlaying.GetUnsafe(); |
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} |
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|
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void AudioOutputDeviceJack::Stop() { |
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csIsPlaying.PushAndUnlock(false); |
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} |
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|
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void AudioOutputDeviceJack::AcquireChannels(uint uiChannels) { |
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if (uiChannels > this->Channels.size()) { |
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for (int c = uiChannels; c < uiChannels; c++) { |
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// create new jack output port |
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std::stringstream portid; portid << "LinuxSampler:" << c; |
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jack_port_t* newport; |
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if (newport = jack_port_register(hJackClient, portid.str().c_str(), JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0)) { |
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hJackPorts.push_back(newport); |
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} |
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else throw AudioOutputException("Jack: Cannot register Jack output port."); |
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|
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// create LS audio channel |
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std::stringstream chanid; chanid << "Jack:" << c; |
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Channels.push_back(new AudioChannel((float*) jack_port_get_buffer(newport, uiMaxSamplesPerCycle), uiMaxSamplesPerCycle, chanid.str())); |
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} |
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} |
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} |
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|
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uint AudioOutputDeviceJack::MaxSamplesPerCycle() { |
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return jack_get_buffer_size(hJackClient); |
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} |
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|
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uint AudioOutputDeviceJack::SampleRate() { |
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return jack_get_sample_rate(hJackClient); |
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} |
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|
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|
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|
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// libjack callback functions |
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|
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int __libjack_process_callback(jack_nframes_t nframes, void* arg) { |
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AudioOutputDeviceJack* pAudioOutputDeviceJack = (AudioOutputDeviceJack*) arg; |
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return pAudioOutputDeviceJack->Process(nframes); |
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} |
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|
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void __libjack_shutdown_callback(void* arg) { |
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AudioOutputDeviceJack* pAudioOutputDeviceJack = (AudioOutputDeviceJack*) arg; |
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pAudioOutputDeviceJack->Stop(); |
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fprintf(stderr, "Jack: Jack server shutdown, exiting.\n"); |
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} |
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|
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} // namespace LinuxSampler |
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|
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#endif // HAVE_JACK |