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Diffstat (limited to 'flow/synth_play_impl.cpp')
| -rw-r--r-- | flow/synth_play_impl.cpp | 284 |
1 files changed, 284 insertions, 0 deletions
diff --git a/flow/synth_play_impl.cpp b/flow/synth_play_impl.cpp new file mode 100644 index 0000000..cfb4c98 --- /dev/null +++ b/flow/synth_play_impl.cpp @@ -0,0 +1,284 @@ + /* + + Copyright (C) 2000 Stefan Westerfeld + stefan@space.twc.de + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public + License as published by the Free Software Foundation; either + version 2 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public License + along with this library; see the file COPYING.LIB. If not, write to + the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, + Boston, MA 02110-1301, USA. + + */ + +#include "artsflow.h" +#include "debug.h" +#include "convert.h" +#include "objectmanager.h" +#include "audiosubsys.h" +#include "dispatcher.h" +#include "iomanager.h" +#include "flowsystem.h" +#include "stdsynthmodule.h" +#include <stdio.h> +#include <iostream> + +using namespace std; +using namespace Arts; + +namespace Arts { + +class Synth_PLAY_impl : virtual public Synth_PLAY_skel, + virtual public ASProducer, + virtual public StdSynthModule, + virtual public IONotify, + virtual public TimeNotify +{ +protected: + AudioSubSystem *as; + bool haveSubSys; + /* + * these are to prevent the following situation + * 1) audio subsystem needs more data + * 2) calculation is started + * 3) somehow, some module makes a synchronous invocation to the outside + * world and waits for the result + * 4) since the audio subsystem still needs data, and since we are in an + * idle state now, another calculation will be started, which will of + * course fail due to reentrancy + * 5) repeat 4) until result is there => lots of wasted CPU cycles (when + * running with realtime priority: system freeze) + */ + bool inProgress; // we are just doing some calculations + bool restartIOHandling; // I/O handlers removed upon reaching 4: restart + + int audioReadFD; + int audioWriteFD; + bool audioOpen; + + typedef unsigned char uchar; + + unsigned char *outblock; + unsigned long maxsamples; + unsigned long channels; + int format; + int bits; + + bool retryOpen; +public: + /* + * functions from the SynthModule interface (which is inherited by + * SynthPlay) + */ + void streamInit() { + as = AudioSubSystem::the(); + + maxsamples = 0; + outblock = 0; + retryOpen = false; + audioOpen = false; + inProgress = false; + + haveSubSys = as->attachProducer(this); + if(!haveSubSys) + { + arts_info("Synth_PLAY: audio subsystem is already used"); + return; + } + + audioOpen = as->open(); + if(!audioOpen) + { + if(Dispatcher::the()->flowSystem()->suspended()) + { + arts_info("/dev/dsp currently unavailable (retrying)"); + Dispatcher::the()->ioManager()->addTimer(1000, this); + retryOpen = true; + } + else + { + arts_info("Synth_PLAY: audio subsystem init failed"); + arts_info("ASError = %s",as->error()); + } + audioReadFD = audioWriteFD = -1; + } + else + { + audioReadFD = as->selectReadFD(); + audioWriteFD = as->selectWriteFD(); + } + + channels = as->channels(); + format = as->format(); + bits = as->bits(); + arts_debug("audio format is %d Hz, %d bits, %d channels", + as->samplingRate(), bits, channels); + } + + void notifyTime() { + assert(retryOpen); + + audioOpen = as->open(); + + if(audioOpen) + { + audioReadFD = as->selectReadFD(); + audioWriteFD = as->selectWriteFD(); + + streamStart(); + arts_info("/dev/dsp ok"); + Dispatcher::the()->ioManager()->removeTimer(this); + retryOpen = false; + } + } + + void streamStart() { + IOManager *iom = Dispatcher::the()->ioManager(); + + if(audioReadFD >= 0) + iom->watchFD(audioReadFD, IOType::read|IOType::except, this); + + if(audioWriteFD >= 0) + iom->watchFD(audioWriteFD, IOType::write|IOType::except, this); + } + + void streamEnd() { + if(retryOpen) + Dispatcher::the()->ioManager()->removeTimer(this); + + arts_debug("Synth_PLAY: closing audio fd"); + if(audioReadFD >= 0 || audioWriteFD >= 0) + { + IOManager *iom = Dispatcher::the()->ioManager(); + iom->remove(this,IOType::all); + audioReadFD = audioWriteFD = -1; + } + AudioSubSystem::the()->detachProducer(); + + if(outblock) + { + delete[] outblock; + outblock = 0; + } + } + + AutoSuspendState autoSuspend() + { + return static_cast<AutoSuspendState>(asSuspendStop|asConsumer); + } + + void calculateBlock(unsigned long samples) + { + // no audio subsystem, no play + if(!as->running() || !haveSubSys) return; + + if(samples > maxsamples) + { + maxsamples = samples; + + if(outblock) delete[] outblock; + outblock = new uchar[maxsamples * channels * ( format & ( 8 | 16 | 32 ) ) / 8]; + } + + assert(channels); + + arts_assert(format == 8 || format == 16 || format == 17 || format == 32 ); + if(channels == 1) + { + if(format == 8) + convert_mono_float_8(samples,invalue_left,outblock); + else if(format == 16) + convert_mono_float_16le(samples,invalue_left,outblock); + else if(format == 17) + convert_mono_float_16be(samples,invalue_left,outblock); + else if(format == 32) + { + as->write( invalue_left, samples ); + return; + } + } + else if(channels == 2) + { + if(format == 8) + convert_stereo_2float_i8(samples,invalue_left,invalue_right, + outblock); + else if(format == 16) + convert_stereo_2float_i16le(samples,invalue_left,invalue_right, + outblock); + else if(format == 17) + convert_stereo_2float_i16be(samples,invalue_left,invalue_right, + outblock); + else if(format == 32) + { + float * buffer = ( float* )outblock; + float * end = invalue_left + samples; + while( invalue_left < end ) + { + *buffer++ = *invalue_left++; + *buffer++ = *invalue_right++; + } + as->write( outblock, 2 * samples * sizeof( float ) ); + return; + } + } + else arts_warning("channels != 1 && channels != 2?"); + + as->write(outblock,channels * (bits / 8) * samples); + } + + /** + * notifyIO from the IONotify interface (IOManager) + */ + void notifyIO(int fd, int type) + { + arts_return_if_fail(as->running()); + assert(fd == audioReadFD || fd == audioWriteFD); + + if(inProgress) + { + if(!restartIOHandling) + { + // prevent lots of retries - we just can't do calculations + // now, so we need to wait until the situation has resolved + Dispatcher::the()->ioManager()->remove(this,IOType::all); + restartIOHandling = true; + } + return; + } + + // convert iomanager notification types to audiosubsys notification + int asType = 0; + + if(type & IOType::read) asType |= AudioSubSystem::ioRead; + if(type & IOType::write) asType |= AudioSubSystem::ioWrite; + assert(asType != 0); + + restartIOHandling = false; + inProgress = true; + as->handleIO(asType); + inProgress = false; + if(restartIOHandling) streamStart(); + } + + /** + * needmore from the ASProducer interface (AudioSubSystem) + */ + void needMore() + { + _node()->requireFlow(); + } + +}; + +REGISTER_IMPLEMENTATION(Synth_PLAY_impl); + +} |