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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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* * |
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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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REGISTER_AUDIO_OUTPUT_DRIVER(AudioOutputDeviceAlsa); |
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|
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/* Common parameters for now they'll have to be registered here. */ |
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REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAlsa, ParameterActive); |
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REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAlsa, ParameterSampleRate); |
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REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAlsa, ParameterChannels); |
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|
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/* Driver specific parameters */ |
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REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAlsa, ParameterCard); |
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REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAlsa, ParameterFragments); |
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REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAlsa, ParameterFragmentSize); |
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|
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|
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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 (LinuxSamplerException) : DeviceCreationParameterString(s) { |
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SetValue(s); // try to use given card |
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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 LinuxSamplerException("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 (LinuxSamplerException) { |
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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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// *************** 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 (LinuxSamplerException) : 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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return 2; // until done |
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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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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, 0) < 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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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, 0) < 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>(); |
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} |
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|
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void AudioOutputDeviceAlsa::ParameterFragments::OnSetValue(int i) throw (LinuxSamplerException) { |
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// not posssible, as parameter is fix |
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} |
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|
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String AudioOutputDeviceAlsa::ParameterFragments::Name() { |
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return "FRAGMENTS"; |
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} |
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|
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|
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|
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// *************** ParameterFragmentSize *************** |
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// * |
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|
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AudioOutputDeviceAlsa::ParameterFragmentSize::ParameterFragmentSize() : DeviceCreationParameterInt() { |
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InitWithDefault(); |
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} |
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|
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AudioOutputDeviceAlsa::ParameterFragmentSize::ParameterFragmentSize(String s) throw (LinuxSamplerException) : DeviceCreationParameterInt(s) { |
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} |
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|
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String AudioOutputDeviceAlsa::ParameterFragmentSize::Description() { |
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return "Size of each buffer fragment"; |
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} |
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|
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bool AudioOutputDeviceAlsa::ParameterFragmentSize::Fix() { |
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return true; |
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} |
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|
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bool AudioOutputDeviceAlsa::ParameterFragmentSize::Mandatory() { |
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return false; |
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} |
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|
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std::map<String,DeviceCreationParameter*> AudioOutputDeviceAlsa::ParameterFragmentSize::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::ParameterFragmentSize::DefaultAsInt(std::map<String,String> Parameters) { |
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return 128; // until done |
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} |
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|
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optional<int> AudioOutputDeviceAlsa::ParameterFragmentSize::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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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, 0) < 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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unsigned long period_size_min; |
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if (snd_pcm_hw_params_get_period_size_min(hwparams, &period_size_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) period_size_min; |
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} |
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|
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optional<int> AudioOutputDeviceAlsa::ParameterFragmentSize::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, 0) < 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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unsigned long period_size_max; |
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if (snd_pcm_hw_params_get_period_size_max(hwparams, &period_size_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) period_size_max; //FIXME: might overflow int limit |
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} |
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|
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std::vector<int> AudioOutputDeviceAlsa::ParameterFragmentSize::PossibilitiesAsInt(std::map<String,String> Parameters) { |
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return std::vector<int>(); |
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} |
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|
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void AudioOutputDeviceAlsa::ParameterFragmentSize::OnSetValue(int i) throw (LinuxSamplerException) { |
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// not posssible, as parameter is fix |
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} |
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|
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String AudioOutputDeviceAlsa::ParameterFragmentSize::Name() { |
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return "FRAGMENTSIZE"; |
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} |
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|
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|
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|
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// *************** AudioOutputDeviceAlsa *************** |
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// * |
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|
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/** |
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* Create and initialize Alsa audio output device with given parameters. |
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* |
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* @param Parameters - optional parameters |
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* @throws AudioOutputException if output device cannot be opened |
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*/ |
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AudioOutputDeviceAlsa::AudioOutputDeviceAlsa(std::map<String,DeviceCreationParameter*> Parameters) : AudioOutputDevice(Parameters), Thread(true, 1, 0) { |
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pcm_handle = NULL; |
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stream = SND_PCM_STREAM_PLAYBACK; |
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this->uiAlsaChannels = ((DeviceCreationParameterInt*)Parameters["CHANNELS"])->ValueAsInt(); |
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this->uiSamplerate = ((DeviceCreationParameterInt*)Parameters["SAMPLERATE"])->ValueAsInt(); |
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this->FragmentSize = ((DeviceCreationParameterInt*)Parameters["FRAGMENTSIZE"])->ValueAsInt(); |
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uint Fragments = ((DeviceCreationParameterInt*)Parameters["FRAGMENTS"])->ValueAsInt(); |
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String Card = ((DeviceCreationParameterString*)Parameters["CARD"])->ValueAsString(); |
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|
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dmsg(1,("Checking if hw parameters supported...\n")); |
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if (HardwareParametersSupported(Card, uiAlsaChannels, uiSamplerate, Fragments, FragmentSize)) { |
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pcm_name = "hw:" + Card; |
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} |
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else { |
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printf("Warning: your soundcard doesn't support chosen hardware parameters; "); |
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printf("trying to compensate support lack with plughw..."); |
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fflush(stdout); |
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pcm_name = "plughw:" + Card; |
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} |
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dmsg(1,("HW check completed.\n")); |
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|
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int err; |
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|
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snd_pcm_hw_params_alloca(&hwparams); // Allocate the snd_pcm_hw_params_t structure on the stack. |
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|
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/* Open PCM. The last parameter of this function is the mode. */ |
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/* If this is set to 0, the standard mode is used. Possible */ |
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/* other values are SND_PCM_NONBLOCK and SND_PCM_ASYNC. */ |
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/* If SND_PCM_NONBLOCK is used, read / write access to the */ |
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/* PCM device will return immediately. If SND_PCM_ASYNC is */ |
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/* specified, SIGIO will be emitted whenever a period has */ |
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/* been completely processed by the soundcard. */ |
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if ((err = snd_pcm_open(&pcm_handle, pcm_name.c_str(), stream, 0)) < 0) { |
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throw AudioOutputException(String("Error opening PCM device ") + pcm_name + ": " + snd_strerror(err)); |
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} |
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|
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if ((err = snd_pcm_hw_params_any(pcm_handle, hwparams)) < 0) { |
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throw AudioOutputException(String("Error, cannot initialize hardware parameter structure: ") + snd_strerror(err)); |
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} |
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|
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/* Set access type. This can be either */ |
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/* SND_PCM_ACCESS_RW_INTERLEAVED or */ |
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/* SND_PCM_ACCESS_RW_NONINTERLEAVED. */ |
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if ((err = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) { |
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throw AudioOutputException(String("Error snd_pcm_hw_params_set_access: ") + snd_strerror(err)); |
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} |
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|
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/* Set sample format */ |
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#if WORDS_BIGENDIAN |
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if ((err = snd_pcm_hw_params_set_format(pcm_handle, hwparams, SND_PCM_FORMAT_S16_BE)) < 0) |
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#else // little endian |
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if ((err = snd_pcm_hw_params_set_format(pcm_handle, hwparams, SND_PCM_FORMAT_S16_LE)) < 0) |
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#endif |
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{ |
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throw AudioOutputException(String("Error setting sample format: ") + snd_strerror(err)); |
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} |
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|
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int dir = 0; |
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|
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/* Set sample rate. If the exact rate is not supported */ |
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/* by the hardware, use nearest possible rate. */ |
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#if ALSA_MAJOR > 0 |
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if((err = snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &uiSamplerate, &dir)) < 0) |
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#else |
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if((err = snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, uiSamplerate, &dir)) < 0) |
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#endif |
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{ |
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throw AudioOutputException(String("Error setting sample rate: ") + snd_strerror(err)); |
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} |
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|
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if ((err = snd_pcm_hw_params_set_channels(pcm_handle, hwparams, uiAlsaChannels)) < 0) { |
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throw AudioOutputException(String("Error setting number of channels: ") + snd_strerror(err)); |
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} |
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|
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/* Set number of periods. Periods used to be called fragments. */ |
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if ((err = snd_pcm_hw_params_set_periods(pcm_handle, hwparams, Fragments, dir)) < 0) { |
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throw AudioOutputException(String("Error setting number of periods: ") + snd_strerror(err)); |
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} |
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|
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/* Set buffer size (in frames). The resulting latency is given by */ |
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/* latency = periodsize * periods / (rate * bytes_per_frame) */ |
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if ((err = snd_pcm_hw_params_set_buffer_size(pcm_handle, hwparams, (FragmentSize * Fragments))) < 0) { |
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throw AudioOutputException(String("Error setting buffersize: ") + snd_strerror(err)); |
391 |
} |
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|
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/* Apply HW parameter settings to */ |
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/* PCM device and prepare device */ |
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if ((err = snd_pcm_hw_params(pcm_handle, hwparams)) < 0) { |
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throw AudioOutputException(String("Error setting HW params: ") + snd_strerror(err)); |
397 |
} |
398 |
|
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if (snd_pcm_sw_params_malloc(&swparams) != 0) { |
400 |
throw AudioOutputException(String("Error in snd_pcm_sw_params_malloc: ") + snd_strerror(err)); |
401 |
} |
402 |
|
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if (snd_pcm_sw_params_current(pcm_handle, swparams) != 0) { |
404 |
throw AudioOutputException(String("Error in snd_pcm_sw_params_current: ") + snd_strerror(err)); |
405 |
} |
406 |
|
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if (snd_pcm_sw_params_set_stop_threshold(pcm_handle, swparams, 0xffffffff) != 0) { |
408 |
throw AudioOutputException(String("Error in snd_pcm_sw_params_set_stop_threshold: ") + snd_strerror(err)); |
409 |
} |
410 |
|
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if (snd_pcm_sw_params(pcm_handle, swparams) != 0) { |
412 |
throw AudioOutputException(String("Error in snd_pcm_sw_params: ") + snd_strerror(err)); |
413 |
} |
414 |
|
415 |
if ((err = snd_pcm_prepare(pcm_handle)) < 0) { |
416 |
throw AudioOutputException(String("Error snd_pcm_prepare: ") + snd_strerror(err)); |
417 |
} |
418 |
|
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// allocate Alsa output buffer |
420 |
pAlsaOutputBuffer = new int16_t[uiAlsaChannels * FragmentSize]; |
421 |
|
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// create audio channels for this audio device to which the sampler engines can write to |
423 |
for (int i = 0; i < uiAlsaChannels; i++) this->Channels.push_back(new AudioChannel(i, FragmentSize)); |
424 |
|
425 |
if (((DeviceCreationParameterBool*)Parameters["ACTIVE"])->ValueAsBool()) { |
426 |
Play(); |
427 |
} |
428 |
} |
429 |
|
430 |
AudioOutputDeviceAlsa::~AudioOutputDeviceAlsa() { |
431 |
//dmsg(0,("Stopping Alsa Thread...")); |
432 |
//StopThread(); //FIXME: commented out due to a bug in thread.cpp (StopThread() doesn't return at all) |
433 |
//dmsg(0,("OK\n")); |
434 |
|
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//FIXME: currently commented out due to segfault |
436 |
//snd_pcm_close(pcm_handle); |
437 |
|
438 |
if (pAlsaOutputBuffer) { |
439 |
//FIXME: currently commented out due to segfault |
440 |
//delete[] pOutputBuffer; |
441 |
} |
442 |
} |
443 |
|
444 |
/** |
445 |
* Checks if sound card supports the chosen parameters. |
446 |
* |
447 |
* @returns true if hardware supports it |
448 |
*/ |
449 |
bool AudioOutputDeviceAlsa::HardwareParametersSupported(String card, uint channels, int samplerate, uint numfragments, uint fragmentsize) { |
450 |
pcm_name = "hw:" + card; |
451 |
if (snd_pcm_open(&pcm_handle, pcm_name.c_str(), stream, 0) < 0) return false; |
452 |
snd_pcm_hw_params_alloca(&hwparams); |
453 |
if (snd_pcm_hw_params_any(pcm_handle, hwparams) < 0) { |
454 |
snd_pcm_close(pcm_handle); |
455 |
return false; |
456 |
} |
457 |
if (snd_pcm_hw_params_test_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED) < 0) { |
458 |
snd_pcm_close(pcm_handle); |
459 |
return false; |
460 |
} |
461 |
#if WORDS_BIGENDIAN |
462 |
if (snd_pcm_hw_params_test_format(pcm_handle, hwparams, SND_PCM_FORMAT_S16_BE) < 0) |
463 |
#else // little endian |
464 |
if (snd_pcm_hw_params_test_format(pcm_handle, hwparams, SND_PCM_FORMAT_S16_LE) < 0) |
465 |
#endif |
466 |
{ |
467 |
snd_pcm_close(pcm_handle); |
468 |
return false; |
469 |
} |
470 |
int dir = 0; |
471 |
if (snd_pcm_hw_params_test_rate(pcm_handle, hwparams, samplerate, dir) < 0) { |
472 |
snd_pcm_close(pcm_handle); |
473 |
return false; |
474 |
} |
475 |
if (snd_pcm_hw_params_test_channels(pcm_handle, hwparams, channels) < 0) { |
476 |
snd_pcm_close(pcm_handle); |
477 |
return false; |
478 |
} |
479 |
if (snd_pcm_hw_params_test_periods(pcm_handle, hwparams, numfragments, dir) < 0) { |
480 |
snd_pcm_close(pcm_handle); |
481 |
return false; |
482 |
} |
483 |
if (snd_pcm_hw_params_test_buffer_size(pcm_handle, hwparams, (fragmentsize * numfragments)) < 0) { |
484 |
snd_pcm_close(pcm_handle); |
485 |
return false; |
486 |
} |
487 |
|
488 |
snd_pcm_close(pcm_handle); |
489 |
return true; |
490 |
} |
491 |
|
492 |
void AudioOutputDeviceAlsa::Play() { |
493 |
StartThread(); |
494 |
} |
495 |
|
496 |
bool AudioOutputDeviceAlsa::IsPlaying() { |
497 |
return IsRunning(); // if Thread is running |
498 |
} |
499 |
|
500 |
void AudioOutputDeviceAlsa::Stop() { |
501 |
StopThread(); |
502 |
} |
503 |
|
504 |
AudioChannel* AudioOutputDeviceAlsa::CreateChannel(uint ChannelNr) { |
505 |
// just create a mix channel |
506 |
return new AudioChannel(ChannelNr, Channel(ChannelNr % uiAlsaChannels)); |
507 |
} |
508 |
|
509 |
uint AudioOutputDeviceAlsa::MaxSamplesPerCycle() { |
510 |
return FragmentSize; |
511 |
} |
512 |
|
513 |
uint AudioOutputDeviceAlsa::SampleRate() { |
514 |
return uiSamplerate; |
515 |
} |
516 |
|
517 |
String AudioOutputDeviceAlsa::Name() { |
518 |
return "ALSA"; |
519 |
} |
520 |
|
521 |
String AudioOutputDeviceAlsa::Driver() { |
522 |
return Name(); |
523 |
} |
524 |
|
525 |
String AudioOutputDeviceAlsa::Description() { |
526 |
return "Advanced Linux Sound Architecture"; |
527 |
} |
528 |
|
529 |
String AudioOutputDeviceAlsa::Version() { |
530 |
String s = "$Revision: 1.14 $"; |
531 |
return s.substr(11, s.size() - 13); // cut dollar signs, spaces and CVS macro keyword |
532 |
} |
533 |
|
534 |
/** |
535 |
* Entry point for the thread. |
536 |
*/ |
537 |
int AudioOutputDeviceAlsa::Main() { |
538 |
while (true) { |
539 |
|
540 |
// let all connected engines render 'FragmentSize' sample points |
541 |
RenderAudio(FragmentSize); |
542 |
|
543 |
// convert from DSP value range (-1.0..+1.0) to 16 bit integer value |
544 |
// range (-32768..+32767), check clipping and copy to Alsa output buffer |
545 |
// (note: we use interleaved output method to Alsa) |
546 |
for (int c = 0; c < uiAlsaChannels; c++) { |
547 |
float* in = Channels[c]->Buffer(); |
548 |
for (int i = 0, o = c; i < FragmentSize; i++ , o += uiAlsaChannels) { |
549 |
float sample_point = in[i] * 32768.0f; |
550 |
if (sample_point < -32768.0) sample_point = -32768.0; |
551 |
if (sample_point > 32767.0) sample_point = 32767.0; |
552 |
pAlsaOutputBuffer[o] = (int16_t) sample_point; |
553 |
} |
554 |
} |
555 |
|
556 |
// output sound |
557 |
int res = Output(); |
558 |
if (res < 0) { |
559 |
fprintf(stderr, "Alsa: Audio output error, exiting.\n"); |
560 |
exit(EXIT_FAILURE); |
561 |
} |
562 |
} |
563 |
} |
564 |
|
565 |
/** |
566 |
* Will be called after every audio fragment cycle, to output the audio data |
567 |
* of the current fragment to the soundcard. |
568 |
* |
569 |
* @returns 0 on success, a value < 0 on error |
570 |
*/ |
571 |
int AudioOutputDeviceAlsa::Output() { |
572 |
int err = snd_pcm_writei(pcm_handle, pAlsaOutputBuffer, FragmentSize); |
573 |
if (err < 0) { |
574 |
fprintf(stderr, "Error snd_pcm_writei failed: %s\n", snd_strerror(err)); |
575 |
return -1; |
576 |
} |
577 |
return 0; |
578 |
} |
579 |
|
580 |
} // namespace LinuxSampler |