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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, 2004 by Benno Senoner and Christian Schoenebeck * |
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* Copyright (C) 2005 - 2007 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 "AudioOutputDeviceAlsa.h" |
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#include "AudioOutputDeviceFactory.h" |
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|
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namespace LinuxSampler { |
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|
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// *************** ParameterCard *************** |
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// * |
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|
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AudioOutputDeviceAlsa::ParameterCard::ParameterCard() : DeviceCreationParameterString() { |
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InitWithDefault(); // use default card |
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} |
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|
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AudioOutputDeviceAlsa::ParameterCard::ParameterCard(String s) throw (Exception) : DeviceCreationParameterString(s) { |
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} |
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|
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String AudioOutputDeviceAlsa::ParameterCard::Description() { |
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return "Sound card to be used"; |
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} |
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|
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bool AudioOutputDeviceAlsa::ParameterCard::Fix() { |
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return true; |
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} |
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|
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bool AudioOutputDeviceAlsa::ParameterCard::Mandatory() { |
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return false; |
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} |
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|
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std::map<String,DeviceCreationParameter*> AudioOutputDeviceAlsa::ParameterCard::DependsAsParameters() { |
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return std::map<String,DeviceCreationParameter*>(); // no dependencies |
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} |
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|
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optional<String> AudioOutputDeviceAlsa::ParameterCard::DefaultAsString(std::map<String,String> Parameters) { |
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std::vector<String> cards = PossibilitiesAsString(Parameters); |
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if (cards.empty()) throw Exception("AudioOutputDeviceAlsa: Can't find any card"); |
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return cards[0]; // first card by default |
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} |
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|
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std::vector<String> AudioOutputDeviceAlsa::ParameterCard::PossibilitiesAsString(std::map<String,String> Parameters) { |
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int err; |
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std::vector<String> CardNames; |
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|
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// iterate through all cards |
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int card_index = -1; |
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while (snd_card_next(&card_index) >= 0 && card_index >= 0) { |
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String hw_name = "hw:" + ToString(card_index); |
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snd_ctl_t* hCardCtrl; |
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if ((err = snd_ctl_open(&hCardCtrl, hw_name.c_str(), 0)) < 0) { |
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std::cerr << "AudioOutputDeviceAlsa: Cannot open sound control for card " << card_index << " - " << snd_strerror(err) << std::endl; |
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continue; |
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} |
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|
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// iterate through all devices of that card |
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int device_index = -1; |
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while (!snd_ctl_pcm_next_device(hCardCtrl, &device_index) && device_index >= 0) { |
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String name = ToString(card_index) + "," + ToString(device_index); |
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//dmsg(1,("[possibility:%s]", name.c_str())); |
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CardNames.push_back(name); |
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} |
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|
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snd_ctl_close(hCardCtrl); |
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} |
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|
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return CardNames; |
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} |
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|
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void AudioOutputDeviceAlsa::ParameterCard::OnSetValue(String s) throw (Exception) { |
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// not posssible, as parameter is fix |
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} |
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|
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String AudioOutputDeviceAlsa::ParameterCard::Name() { |
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return "CARD"; |
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} |
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|
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|
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|
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// *************** ParameterSampleRate *************** |
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// * |
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|
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AudioOutputDeviceAlsa::ParameterSampleRate::ParameterSampleRate() : AudioOutputDevice::ParameterSampleRate::ParameterSampleRate() { |
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} |
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|
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AudioOutputDeviceAlsa::ParameterSampleRate::ParameterSampleRate(String s) : AudioOutputDevice::ParameterSampleRate::ParameterSampleRate(s) { |
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} |
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|
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std::map<String,DeviceCreationParameter*> AudioOutputDeviceAlsa::ParameterSampleRate::DependsAsParameters() { |
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static ParameterCard card; |
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std::map<String,DeviceCreationParameter*> dependencies; |
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dependencies[card.Name()] = &card; |
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return dependencies; |
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} |
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|
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optional<int> AudioOutputDeviceAlsa::ParameterSampleRate::DefaultAsInt(std::map<String,String> Parameters) { |
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if (!Parameters.count("CARD")) return optional<int>::nothing; |
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|
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// obtain information from given sound card |
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ParameterCard card(Parameters["CARD"]); |
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String pcm_name = "hw:" + card.ValueAsString(); |
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snd_pcm_t* pcm_handle = NULL; |
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if (snd_pcm_open(&pcm_handle, pcm_name.c_str(), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK) < 0) return optional<int>::nothing; |
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snd_pcm_hw_params_t* hwparams; |
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snd_pcm_hw_params_alloca(&hwparams); |
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if (snd_pcm_hw_params_any(pcm_handle, hwparams) < 0) { |
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snd_pcm_close(pcm_handle); |
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return optional<int>::nothing; |
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} |
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uint rate = 44100; |
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if (snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &rate, NULL) < 0) { |
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snd_pcm_close(pcm_handle); |
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return optional<int>::nothing; |
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} |
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snd_pcm_close(pcm_handle); |
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return rate; |
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} |
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|
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optional<int> AudioOutputDeviceAlsa::ParameterSampleRate::RangeMinAsInt(std::map<String,String> Parameters) { |
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if (!Parameters.count("CARD")) return optional<int>::nothing; |
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|
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// obtain information from given sound card |
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ParameterCard card(Parameters["CARD"]); |
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String pcm_name = "hw:" + card.ValueAsString(); |
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snd_pcm_t* pcm_handle = NULL; |
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if (snd_pcm_open(&pcm_handle, pcm_name.c_str(), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK) < 0) return optional<int>::nothing; |
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snd_pcm_hw_params_t* hwparams; |
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snd_pcm_hw_params_alloca(&hwparams); |
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if (snd_pcm_hw_params_any(pcm_handle, hwparams) < 0) { |
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snd_pcm_close(pcm_handle); |
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return optional<int>::nothing; |
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} |
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uint rate; |
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if (snd_pcm_hw_params_get_rate_min(hwparams, &rate, NULL) < 0) { |
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snd_pcm_close(pcm_handle); |
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return optional<int>::nothing; |
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} |
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snd_pcm_close(pcm_handle); |
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return rate; |
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} |
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|
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optional<int> AudioOutputDeviceAlsa::ParameterSampleRate::RangeMaxAsInt(std::map<String,String> Parameters) { |
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if (!Parameters.count("CARD")) return optional<int>::nothing; |
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|
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// obtain information from given sound card |
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String pcm_name = "hw:" + Parameters["CARD"]; |
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snd_pcm_t* pcm_handle = NULL; |
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if (snd_pcm_open(&pcm_handle, pcm_name.c_str(), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK) < 0) return optional<int>::nothing; |
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snd_pcm_hw_params_t* hwparams; |
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snd_pcm_hw_params_alloca(&hwparams); |
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if (snd_pcm_hw_params_any(pcm_handle, hwparams) < 0) { |
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snd_pcm_close(pcm_handle); |
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return optional<int>::nothing; |
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} |
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uint rate; |
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if (snd_pcm_hw_params_get_rate_max(hwparams, &rate, NULL) < 0) { |
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snd_pcm_close(pcm_handle); |
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return optional<int>::nothing; |
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} |
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snd_pcm_close(pcm_handle); |
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return rate; |
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} |
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|
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|
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|
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// *************** ParameterChannels *************** |
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// * |
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|
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AudioOutputDeviceAlsa::ParameterChannels::ParameterChannels() : AudioOutputDevice::ParameterChannels::ParameterChannels() { |
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//InitWithDefault(); |
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// could not determine default value? ... |
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//if (ValueAsInt() == 0) SetValue(2); // ... then (try) a common value |
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} |
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|
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AudioOutputDeviceAlsa::ParameterChannels::ParameterChannels(String s) : AudioOutputDevice::ParameterChannels::ParameterChannels(s) { |
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} |
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|
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std::map<String,DeviceCreationParameter*> AudioOutputDeviceAlsa::ParameterChannels::DependsAsParameters() { |
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static ParameterCard card; |
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std::map<String,DeviceCreationParameter*> dependencies; |
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dependencies[card.Name()] = &card; |
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return dependencies; |
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} |
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|
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optional<int> AudioOutputDeviceAlsa::ParameterChannels::DefaultAsInt(std::map<String,String> Parameters) { |
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if (!Parameters.count("CARD")) return optional<int>::nothing; |
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|
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// obtain information from given sound card |
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ParameterCard card(Parameters["CARD"]); |
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String pcm_name = "hw:" + card.ValueAsString(); |
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snd_pcm_t* pcm_handle = NULL; |
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if (snd_pcm_open(&pcm_handle, pcm_name.c_str(), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK) < 0) return optional<int>::nothing; |
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snd_pcm_hw_params_t* hwparams; |
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snd_pcm_hw_params_alloca(&hwparams); |
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if (snd_pcm_hw_params_any(pcm_handle, hwparams) < 0) { |
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snd_pcm_close(pcm_handle); |
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return optional<int>::nothing; |
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} |
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uint channels = 2; |
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if (snd_pcm_hw_params_set_channels_near(pcm_handle, hwparams, &channels) < 0) { |
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snd_pcm_close(pcm_handle); |
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return optional<int>::nothing; |
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} |
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snd_pcm_close(pcm_handle); |
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return channels; |
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} |
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|
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optional<int> AudioOutputDeviceAlsa::ParameterChannels::RangeMinAsInt(std::map<String,String> Parameters) { |
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uint channels = 1; |
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if (!Parameters.count("CARD")) return channels; |
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|
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// obtain information from given sound card |
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ParameterCard card(Parameters["CARD"]); |
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String pcm_name = "hw:" + card.ValueAsString(); |
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snd_pcm_t* pcm_handle = NULL; |
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if (snd_pcm_open(&pcm_handle, pcm_name.c_str(), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK) < 0) return channels; |
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snd_pcm_hw_params_t* hwparams; |
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snd_pcm_hw_params_alloca(&hwparams); |
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if (snd_pcm_hw_params_any(pcm_handle, hwparams) < 0) { |
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snd_pcm_close(pcm_handle); |
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return channels; |
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} |
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|
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if (snd_pcm_hw_params_get_channels_min(hwparams, &channels) < 0) { |
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snd_pcm_close(pcm_handle); |
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return channels; |
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} |
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snd_pcm_close(pcm_handle); |
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return channels; |
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} |
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|
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optional<int> AudioOutputDeviceAlsa::ParameterChannels::RangeMaxAsInt(std::map<String,String> Parameters) { |
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uint channels = 100; |
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if (!Parameters.count("CARD")) return channels; |
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|
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// obtain information from given sound card |
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String pcm_name = "hw:" + Parameters["CARD"]; |
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snd_pcm_t* pcm_handle = NULL; |
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if (snd_pcm_open(&pcm_handle, pcm_name.c_str(), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK) < 0) return channels; |
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snd_pcm_hw_params_t* hwparams; |
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snd_pcm_hw_params_alloca(&hwparams); |
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if (snd_pcm_hw_params_any(pcm_handle, hwparams) < 0) { |
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snd_pcm_close(pcm_handle); |
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return channels; |
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} |
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|
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if (snd_pcm_hw_params_get_channels_max(hwparams, &channels) < 0) { |
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snd_pcm_close(pcm_handle); |
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return channels; |
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} |
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snd_pcm_close(pcm_handle); |
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return channels; |
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} |
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|
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|
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|
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// *************** ParameterFragments *************** |
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// * |
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|
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AudioOutputDeviceAlsa::ParameterFragments::ParameterFragments() : DeviceCreationParameterInt() { |
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InitWithDefault(); |
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} |
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|
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AudioOutputDeviceAlsa::ParameterFragments::ParameterFragments(String s) throw (Exception) : DeviceCreationParameterInt(s) { |
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} |
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|
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String AudioOutputDeviceAlsa::ParameterFragments::Description() { |
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return "Number of buffer fragments"; |
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} |
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|
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bool AudioOutputDeviceAlsa::ParameterFragments::Fix() { |
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return true; |
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} |
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|
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bool AudioOutputDeviceAlsa::ParameterFragments::Mandatory() { |
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return false; |
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} |
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|
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std::map<String,DeviceCreationParameter*> AudioOutputDeviceAlsa::ParameterFragments::DependsAsParameters() { |
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static ParameterCard card; |
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std::map<String,DeviceCreationParameter*> dependencies; |
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dependencies[card.Name()] = &card; |
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return dependencies; |
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} |
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|
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optional<int> AudioOutputDeviceAlsa::ParameterFragments::DefaultAsInt(std::map<String,String> Parameters) { |
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if (!Parameters.count("CARD")) return optional<int>::nothing; |
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|
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// obtain information from given sound card |
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ParameterCard card(Parameters["CARD"]); |
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String pcm_name = "hw:" + card.ValueAsString(); |
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snd_pcm_t* pcm_handle = NULL; |
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if (snd_pcm_open(&pcm_handle, pcm_name.c_str(), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK) < 0) return optional<int>::nothing; |
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snd_pcm_hw_params_t* hwparams; |
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snd_pcm_hw_params_alloca(&hwparams); |
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if (snd_pcm_hw_params_any(pcm_handle, hwparams) < 0) { |
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snd_pcm_close(pcm_handle); |
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return optional<int>::nothing; |
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} |
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uint segs = 2; |
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if (snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, &segs, NULL) < 0) { |
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snd_pcm_close(pcm_handle); |
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return optional<int>::nothing; |
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} |
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snd_pcm_close(pcm_handle); |
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return segs; |
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} |
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|
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optional<int> AudioOutputDeviceAlsa::ParameterFragments::RangeMinAsInt(std::map<String,String> Parameters) { |
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if (!Parameters.count("CARD")) return optional<int>::nothing; |
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|
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// obtain information from given sound card |
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ParameterCard card(Parameters["CARD"]); |
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String pcm_name = "hw:" + card.ValueAsString(); |
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snd_pcm_t* pcm_handle = NULL; |
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if (snd_pcm_open(&pcm_handle, pcm_name.c_str(), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK) < 0) return optional<int>::nothing; |
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snd_pcm_hw_params_t* hwparams; |
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snd_pcm_hw_params_alloca(&hwparams); |
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if (snd_pcm_hw_params_any(pcm_handle, hwparams) < 0) { |
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snd_pcm_close(pcm_handle); |
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return optional<int>::nothing; |
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} |
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int dir = 0; |
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uint periods_min; |
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if (snd_pcm_hw_params_get_periods_min(hwparams, &periods_min, &dir) < 0) { |
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snd_pcm_close(pcm_handle); |
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return optional<int>::nothing; |
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} |
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snd_pcm_close(pcm_handle); |
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return (int) periods_min; |
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} |
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|
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optional<int> AudioOutputDeviceAlsa::ParameterFragments::RangeMaxAsInt(std::map<String,String> Parameters) { |
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if (!Parameters.count("CARD")) return optional<int>::nothing; |
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|
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// obtain information from given sound card |
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ParameterCard card(Parameters["CARD"]); |
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String pcm_name = "hw:" + card.ValueAsString(); |
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snd_pcm_t* pcm_handle = NULL; |
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if (snd_pcm_open(&pcm_handle, pcm_name.c_str(), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK) < 0) return optional<int>::nothing; |
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snd_pcm_hw_params_t* hwparams; |
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snd_pcm_hw_params_alloca(&hwparams); |
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if (snd_pcm_hw_params_any(pcm_handle, hwparams) < 0) { |
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snd_pcm_close(pcm_handle); |
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return optional<int>::nothing; |
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} |
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int dir = 0; |
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uint periods_max; |
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if (snd_pcm_hw_params_get_periods_max(hwparams, &periods_max, &dir) < 0) { |
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snd_pcm_close(pcm_handle); |
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return optional<int>::nothing; |
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} |
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snd_pcm_close(pcm_handle); |
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return (int) periods_max; |
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} |
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|
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std::vector<int> AudioOutputDeviceAlsa::ParameterFragments::PossibilitiesAsInt(std::map<String,String> Parameters) { |
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return std::vector<int>(); |
378 |
} |
379 |
|
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void AudioOutputDeviceAlsa::ParameterFragments::OnSetValue(int i) throw (Exception) { |
381 |
// not posssible, as parameter is fix |
382 |
} |
383 |
|
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String AudioOutputDeviceAlsa::ParameterFragments::Name() { |
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return "FRAGMENTS"; |
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} |
387 |
|
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|
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|
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// *************** ParameterFragmentSize *************** |
391 |
// * |
392 |
|
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AudioOutputDeviceAlsa::ParameterFragmentSize::ParameterFragmentSize() : DeviceCreationParameterInt() { |
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InitWithDefault(); |
395 |
} |
396 |
|
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AudioOutputDeviceAlsa::ParameterFragmentSize::ParameterFragmentSize(String s) throw (Exception) : DeviceCreationParameterInt(s) { |
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} |
399 |
|
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String AudioOutputDeviceAlsa::ParameterFragmentSize::Description() { |
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return "Size of each buffer fragment"; |
402 |
} |
403 |
|
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bool AudioOutputDeviceAlsa::ParameterFragmentSize::Fix() { |
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return true; |
406 |
} |
407 |
|
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bool AudioOutputDeviceAlsa::ParameterFragmentSize::Mandatory() { |
409 |
return false; |
410 |
} |
411 |
|
412 |
std::map<String,DeviceCreationParameter*> AudioOutputDeviceAlsa::ParameterFragmentSize::DependsAsParameters() { |
413 |
static ParameterCard card; |
414 |
std::map<String,DeviceCreationParameter*> dependencies; |
415 |
dependencies[card.Name()] = &card; |
416 |
return dependencies; |
417 |
} |
418 |
|
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optional<int> AudioOutputDeviceAlsa::ParameterFragmentSize::DefaultAsInt(std::map<String,String> Parameters) { |
420 |
if (!Parameters.count("CARD")) return optional<int>::nothing; |
421 |
|
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// obtain information from given sound card |
423 |
ParameterCard card(Parameters["CARD"]); |
424 |
String pcm_name = "hw:" + card.ValueAsString(); |
425 |
snd_pcm_t* pcm_handle = NULL; |
426 |
if (snd_pcm_open(&pcm_handle, pcm_name.c_str(), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK) < 0) return optional<int>::nothing; |
427 |
snd_pcm_hw_params_t* hwparams; |
428 |
snd_pcm_hw_params_alloca(&hwparams); |
429 |
if (snd_pcm_hw_params_any(pcm_handle, hwparams) < 0) { |
430 |
snd_pcm_close(pcm_handle); |
431 |
return optional<int>::nothing; |
432 |
} |
433 |
snd_pcm_uframes_t size = 128; |
434 |
if (snd_pcm_hw_params_set_period_size_near(pcm_handle, hwparams, &size, NULL) < 0) { |
435 |
snd_pcm_close(pcm_handle); |
436 |
return optional<int>::nothing; |
437 |
} |
438 |
snd_pcm_close(pcm_handle); |
439 |
return size; |
440 |
} |
441 |
|
442 |
optional<int> AudioOutputDeviceAlsa::ParameterFragmentSize::RangeMinAsInt(std::map<String,String> Parameters) { |
443 |
if (!Parameters.count("CARD")) return optional<int>::nothing; |
444 |
|
445 |
// obtain information from given sound card |
446 |
ParameterCard card(Parameters["CARD"]); |
447 |
String pcm_name = "hw:" + card.ValueAsString(); |
448 |
snd_pcm_t* pcm_handle = NULL; |
449 |
if (snd_pcm_open(&pcm_handle, pcm_name.c_str(), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK) < 0) return optional<int>::nothing; |
450 |
snd_pcm_hw_params_t* hwparams; |
451 |
snd_pcm_hw_params_alloca(&hwparams); |
452 |
if (snd_pcm_hw_params_any(pcm_handle, hwparams) < 0) { |
453 |
snd_pcm_close(pcm_handle); |
454 |
return optional<int>::nothing; |
455 |
} |
456 |
int dir = 0; |
457 |
unsigned long period_size_min; |
458 |
if (snd_pcm_hw_params_get_period_size_min(hwparams, &period_size_min, &dir) < 0) { |
459 |
snd_pcm_close(pcm_handle); |
460 |
return optional<int>::nothing; |
461 |
} |
462 |
snd_pcm_close(pcm_handle); |
463 |
return (int) period_size_min; |
464 |
} |
465 |
|
466 |
optional<int> AudioOutputDeviceAlsa::ParameterFragmentSize::RangeMaxAsInt(std::map<String,String> Parameters) { |
467 |
if (!Parameters.count("CARD")) return optional<int>::nothing; |
468 |
|
469 |
// obtain information from given sound card |
470 |
ParameterCard card(Parameters["CARD"]); |
471 |
String pcm_name = "hw:" + card.ValueAsString(); |
472 |
snd_pcm_t* pcm_handle = NULL; |
473 |
if (snd_pcm_open(&pcm_handle, pcm_name.c_str(), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK) < 0) return optional<int>::nothing; |
474 |
snd_pcm_hw_params_t* hwparams; |
475 |
snd_pcm_hw_params_alloca(&hwparams); |
476 |
if (snd_pcm_hw_params_any(pcm_handle, hwparams) < 0) { |
477 |
snd_pcm_close(pcm_handle); |
478 |
return optional<int>::nothing; |
479 |
} |
480 |
int dir = 0; |
481 |
unsigned long period_size_max; |
482 |
if (snd_pcm_hw_params_get_period_size_max(hwparams, &period_size_max, &dir) < 0) { |
483 |
snd_pcm_close(pcm_handle); |
484 |
return optional<int>::nothing; |
485 |
} |
486 |
snd_pcm_close(pcm_handle); |
487 |
return (int) period_size_max; //FIXME: might overflow int limit |
488 |
} |
489 |
|
490 |
std::vector<int> AudioOutputDeviceAlsa::ParameterFragmentSize::PossibilitiesAsInt(std::map<String,String> Parameters) { |
491 |
return std::vector<int>(); |
492 |
} |
493 |
|
494 |
void AudioOutputDeviceAlsa::ParameterFragmentSize::OnSetValue(int i) throw (Exception) { |
495 |
// not posssible, as parameter is fix |
496 |
} |
497 |
|
498 |
String AudioOutputDeviceAlsa::ParameterFragmentSize::Name() { |
499 |
return "FRAGMENTSIZE"; |
500 |
} |
501 |
|
502 |
|
503 |
|
504 |
// *************** AudioOutputDeviceAlsa *************** |
505 |
// * |
506 |
|
507 |
/** |
508 |
* Create and initialize Alsa audio output device with given parameters. |
509 |
* |
510 |
* @param Parameters - optional parameters |
511 |
* @throws AudioOutputException if output device cannot be opened |
512 |
*/ |
513 |
AudioOutputDeviceAlsa::AudioOutputDeviceAlsa(std::map<String,DeviceCreationParameter*> Parameters) : AudioOutputDevice(Parameters), Thread(true, true, 1, 0) { |
514 |
pcm_handle = NULL; |
515 |
stream = SND_PCM_STREAM_PLAYBACK; |
516 |
this->uiAlsaChannels = ((DeviceCreationParameterInt*)Parameters["CHANNELS"])->ValueAsInt(); |
517 |
this->uiSamplerate = ((DeviceCreationParameterInt*)Parameters["SAMPLERATE"])->ValueAsInt(); |
518 |
this->FragmentSize = ((DeviceCreationParameterInt*)Parameters["FRAGMENTSIZE"])->ValueAsInt(); |
519 |
uint Fragments = ((DeviceCreationParameterInt*)Parameters["FRAGMENTS"])->ValueAsInt(); |
520 |
String Card = ((DeviceCreationParameterString*)Parameters["CARD"])->ValueAsString(); |
521 |
|
522 |
dmsg(2,("Checking if hw parameters supported...\n")); |
523 |
if (HardwareParametersSupported(Card, uiAlsaChannels, uiSamplerate, Fragments, FragmentSize)) { |
524 |
pcm_name = "hw:" + Card; |
525 |
} |
526 |
else { |
527 |
fprintf(stderr, "Warning: your soundcard doesn't support chosen hardware parameters; "); |
528 |
fprintf(stderr, "trying to compensate support lack with plughw..."); |
529 |
fflush(stdout); |
530 |
pcm_name = "plughw:" + Card; |
531 |
} |
532 |
dmsg(2,("HW check completed.\n")); |
533 |
|
534 |
int err; |
535 |
|
536 |
snd_pcm_hw_params_alloca(&hwparams); // Allocate the snd_pcm_hw_params_t structure on the stack. |
537 |
|
538 |
/* Open PCM. The last parameter of this function is the mode. */ |
539 |
/* If this is set to 0, the standard mode is used. Possible */ |
540 |
/* other values are SND_PCM_NONBLOCK and SND_PCM_ASYNC. */ |
541 |
/* If SND_PCM_NONBLOCK is used, read / write access to the */ |
542 |
/* PCM device will return immediately. If SND_PCM_ASYNC is */ |
543 |
/* specified, SIGIO will be emitted whenever a period has */ |
544 |
/* been completely processed by the soundcard. */ |
545 |
if ((err = snd_pcm_open(&pcm_handle, pcm_name.c_str(), stream, 0)) < 0) { |
546 |
throw AudioOutputException(String("Error opening PCM device ") + pcm_name + ": " + snd_strerror(err)); |
547 |
} |
548 |
|
549 |
if ((err = snd_pcm_hw_params_any(pcm_handle, hwparams)) < 0) { |
550 |
throw AudioOutputException(String("Error, cannot initialize hardware parameter structure: ") + snd_strerror(err)); |
551 |
} |
552 |
|
553 |
/* Set access type. This can be either */ |
554 |
/* SND_PCM_ACCESS_RW_INTERLEAVED or */ |
555 |
/* SND_PCM_ACCESS_RW_NONINTERLEAVED. */ |
556 |
if ((err = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) { |
557 |
throw AudioOutputException(String("Error snd_pcm_hw_params_set_access: ") + snd_strerror(err)); |
558 |
} |
559 |
|
560 |
/* Set sample format */ |
561 |
#if WORDS_BIGENDIAN |
562 |
if ((err = snd_pcm_hw_params_set_format(pcm_handle, hwparams, SND_PCM_FORMAT_S16_BE)) < 0) |
563 |
#else // little endian |
564 |
if ((err = snd_pcm_hw_params_set_format(pcm_handle, hwparams, SND_PCM_FORMAT_S16_LE)) < 0) |
565 |
#endif |
566 |
{ |
567 |
throw AudioOutputException(String("Error setting sample format: ") + snd_strerror(err)); |
568 |
} |
569 |
|
570 |
int dir = 0; |
571 |
|
572 |
/* Set sample rate. If the exact rate is not supported */ |
573 |
/* by the hardware, use nearest possible rate. */ |
574 |
#if ALSA_MAJOR > 0 |
575 |
if((err = snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &uiSamplerate, &dir)) < 0) |
576 |
#else |
577 |
if((err = snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, uiSamplerate, &dir)) < 0) |
578 |
#endif |
579 |
{ |
580 |
throw AudioOutputException(String("Error setting sample rate: ") + snd_strerror(err)); |
581 |
} |
582 |
|
583 |
if ((err = snd_pcm_hw_params_set_channels(pcm_handle, hwparams, uiAlsaChannels)) < 0) { |
584 |
throw AudioOutputException(String("Error setting number of channels: ") + snd_strerror(err)); |
585 |
} |
586 |
|
587 |
/* Set number of periods. Periods used to be called fragments. */ |
588 |
if ((err = snd_pcm_hw_params_set_periods(pcm_handle, hwparams, Fragments, dir)) < 0) { |
589 |
throw AudioOutputException(String("Error setting number of ") + ToString(Fragments) + " periods: " + snd_strerror(err)); |
590 |
} |
591 |
|
592 |
/* Set buffer size (in frames). The resulting latency is given by */ |
593 |
/* latency = periodsize * periods / (rate * bytes_per_frame) */ |
594 |
if ((err = snd_pcm_hw_params_set_buffer_size(pcm_handle, hwparams, (FragmentSize * Fragments))) < 0) { |
595 |
throw AudioOutputException(String("Error setting buffersize: ") + snd_strerror(err)); |
596 |
} |
597 |
|
598 |
/* Apply HW parameter settings to */ |
599 |
/* PCM device and prepare device */ |
600 |
if ((err = snd_pcm_hw_params(pcm_handle, hwparams)) < 0) { |
601 |
throw AudioOutputException(String("Error setting HW params: ") + snd_strerror(err)); |
602 |
} |
603 |
|
604 |
if (snd_pcm_sw_params_malloc(&swparams) != 0) { |
605 |
throw AudioOutputException(String("Error in snd_pcm_sw_params_malloc: ") + snd_strerror(err)); |
606 |
} |
607 |
|
608 |
if (snd_pcm_sw_params_current(pcm_handle, swparams) != 0) { |
609 |
throw AudioOutputException(String("Error in snd_pcm_sw_params_current: ") + snd_strerror(err)); |
610 |
} |
611 |
|
612 |
if (snd_pcm_sw_params_set_stop_threshold(pcm_handle, swparams, 0xffffffff) != 0) { |
613 |
throw AudioOutputException(String("Error in snd_pcm_sw_params_set_stop_threshold: ") + snd_strerror(err)); |
614 |
} |
615 |
|
616 |
if (snd_pcm_sw_params(pcm_handle, swparams) != 0) { |
617 |
throw AudioOutputException(String("Error in snd_pcm_sw_params: ") + snd_strerror(err)); |
618 |
} |
619 |
|
620 |
if ((err = snd_pcm_prepare(pcm_handle)) < 0) { |
621 |
throw AudioOutputException(String("Error snd_pcm_prepare: ") + snd_strerror(err)); |
622 |
} |
623 |
|
624 |
// allocate Alsa output buffer |
625 |
pAlsaOutputBuffer = new int16_t[uiAlsaChannels * FragmentSize]; |
626 |
|
627 |
// create audio channels for this audio device to which the sampler engines can write to |
628 |
for (int i = 0; i < uiAlsaChannels; i++) this->Channels.push_back(new AudioChannel(i, FragmentSize)); |
629 |
|
630 |
if (((DeviceCreationParameterBool*)Parameters["ACTIVE"])->ValueAsBool()) { |
631 |
Play(); |
632 |
} |
633 |
} |
634 |
|
635 |
AudioOutputDeviceAlsa::~AudioOutputDeviceAlsa() { |
636 |
//dmsg(0,("Stopping Alsa Thread...")); |
637 |
//StopThread(); //FIXME: commented out due to a bug in thread.cpp (StopThread() doesn't return at all) |
638 |
//dmsg(0,("OK\n")); |
639 |
|
640 |
snd_pcm_close(pcm_handle); |
641 |
|
642 |
if (pAlsaOutputBuffer) { |
643 |
//FIXME: currently commented out due to segfault |
644 |
//delete[] pOutputBuffer; |
645 |
} |
646 |
} |
647 |
|
648 |
/** |
649 |
* Checks if sound card supports the chosen parameters. |
650 |
* |
651 |
* @returns true if hardware supports it |
652 |
* @throws AudioOutputException - if device cannot be accessed |
653 |
*/ |
654 |
bool AudioOutputDeviceAlsa::HardwareParametersSupported(String card, uint channels, int samplerate, uint numfragments, uint fragmentsize) throw (AudioOutputException) { |
655 |
pcm_name = "hw:" + card; |
656 |
int err; |
657 |
if ((err = snd_pcm_open(&pcm_handle, pcm_name.c_str(), stream, SND_PCM_NONBLOCK)) < 0) { |
658 |
throw AudioOutputException(String("Error opening PCM device ") + pcm_name + ": " + snd_strerror(err)); |
659 |
} |
660 |
snd_pcm_hw_params_alloca(&hwparams); |
661 |
if (snd_pcm_hw_params_any(pcm_handle, hwparams) < 0) { |
662 |
snd_pcm_close(pcm_handle); |
663 |
return false; |
664 |
} |
665 |
if (snd_pcm_hw_params_test_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED) < 0) { |
666 |
snd_pcm_close(pcm_handle); |
667 |
return false; |
668 |
} |
669 |
#if WORDS_BIGENDIAN |
670 |
if (snd_pcm_hw_params_test_format(pcm_handle, hwparams, SND_PCM_FORMAT_S16_BE) < 0) |
671 |
#else // little endian |
672 |
if (snd_pcm_hw_params_test_format(pcm_handle, hwparams, SND_PCM_FORMAT_S16_LE) < 0) |
673 |
#endif |
674 |
{ |
675 |
snd_pcm_close(pcm_handle); |
676 |
return false; |
677 |
} |
678 |
int dir = 0; |
679 |
if (snd_pcm_hw_params_test_rate(pcm_handle, hwparams, samplerate, dir) < 0) { |
680 |
snd_pcm_close(pcm_handle); |
681 |
return false; |
682 |
} |
683 |
if (snd_pcm_hw_params_test_channels(pcm_handle, hwparams, channels) < 0) { |
684 |
snd_pcm_close(pcm_handle); |
685 |
return false; |
686 |
} |
687 |
if (snd_pcm_hw_params_test_periods(pcm_handle, hwparams, numfragments, dir) < 0) { |
688 |
snd_pcm_close(pcm_handle); |
689 |
return false; |
690 |
} |
691 |
if (snd_pcm_hw_params_test_buffer_size(pcm_handle, hwparams, (fragmentsize * numfragments)) < 0) { |
692 |
snd_pcm_close(pcm_handle); |
693 |
return false; |
694 |
} |
695 |
|
696 |
snd_pcm_close(pcm_handle); |
697 |
return true; |
698 |
} |
699 |
|
700 |
void AudioOutputDeviceAlsa::Play() { |
701 |
StartThread(); |
702 |
} |
703 |
|
704 |
bool AudioOutputDeviceAlsa::IsPlaying() { |
705 |
return IsRunning(); // if Thread is running |
706 |
} |
707 |
|
708 |
void AudioOutputDeviceAlsa::Stop() { |
709 |
StopThread(); |
710 |
} |
711 |
|
712 |
AudioChannel* AudioOutputDeviceAlsa::CreateChannel(uint ChannelNr) { |
713 |
// just create a mix channel |
714 |
return new AudioChannel(ChannelNr, Channel(ChannelNr % uiAlsaChannels)); |
715 |
} |
716 |
|
717 |
uint AudioOutputDeviceAlsa::MaxSamplesPerCycle() { |
718 |
return FragmentSize; |
719 |
} |
720 |
|
721 |
uint AudioOutputDeviceAlsa::SampleRate() { |
722 |
return uiSamplerate; |
723 |
} |
724 |
|
725 |
String AudioOutputDeviceAlsa::Name() { |
726 |
return "ALSA"; |
727 |
} |
728 |
|
729 |
String AudioOutputDeviceAlsa::Driver() { |
730 |
return Name(); |
731 |
} |
732 |
|
733 |
String AudioOutputDeviceAlsa::Description() { |
734 |
return "Advanced Linux Sound Architecture"; |
735 |
} |
736 |
|
737 |
String AudioOutputDeviceAlsa::Version() { |
738 |
String s = "$Revision: 1.24 $"; |
739 |
return s.substr(11, s.size() - 13); // cut dollar signs, spaces and CVS macro keyword |
740 |
} |
741 |
|
742 |
/** |
743 |
* Entry point for the thread. |
744 |
*/ |
745 |
int AudioOutputDeviceAlsa::Main() { |
746 |
while (true) { |
747 |
|
748 |
// let all connected engines render 'FragmentSize' sample points |
749 |
RenderAudio(FragmentSize); |
750 |
|
751 |
// convert from DSP value range (-1.0..+1.0) to 16 bit integer value |
752 |
// range (-32768..+32767), check clipping and copy to Alsa output buffer |
753 |
// (note: we use interleaved output method to Alsa) |
754 |
for (int c = 0; c < uiAlsaChannels; c++) { |
755 |
float* in = Channels[c]->Buffer(); |
756 |
for (int i = 0, o = c; i < FragmentSize; i++ , o += uiAlsaChannels) { |
757 |
float sample_point = in[i] * 32768.0f; |
758 |
if (sample_point < -32768.0) sample_point = -32768.0; |
759 |
if (sample_point > 32767.0) sample_point = 32767.0; |
760 |
pAlsaOutputBuffer[o] = (int16_t) sample_point; |
761 |
} |
762 |
} |
763 |
|
764 |
// output sound |
765 |
int res = Output(); |
766 |
if (res < 0) { |
767 |
fprintf(stderr, "Alsa: Audio output error, exiting.\n"); |
768 |
exit(EXIT_FAILURE); |
769 |
} |
770 |
} |
771 |
// just to suppress compiler warning |
772 |
return EXIT_FAILURE; |
773 |
} |
774 |
|
775 |
/** |
776 |
* Will be called after every audio fragment cycle, to output the audio data |
777 |
* of the current fragment to the soundcard. |
778 |
* |
779 |
* @returns 0 on success, a value < 0 on error |
780 |
*/ |
781 |
int AudioOutputDeviceAlsa::Output() { |
782 |
int err = snd_pcm_writei(pcm_handle, pAlsaOutputBuffer, FragmentSize); |
783 |
if (err < 0) { |
784 |
fprintf(stderr, "Error snd_pcm_writei failed: %s\n", snd_strerror(err)); |
785 |
return -1; |
786 |
} |
787 |
return 0; |
788 |
} |
789 |
|
790 |
} // namespace LinuxSampler |