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arts/flow/audioiocsl.cc

641 lines
14 KiB

/*
Copyright (C) 2000-2002 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.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
/**
* only compile 'csl' AudioIO class if libcsl is present
*/
#ifdef HAVE_LIBCSL
#include <csl/csl.h>
/* g_newa */
#include <gsl/gsldefs.h>
#include <vector>
#include "audioio.h"
#include "audiosubsys.h"
#include "debug.h"
#include "dispatcher.h"
#include "iomanager.h"
namespace Arts {
class AudioIOCSL : public AudioIO,
public IONotify
{
protected:
CslPcmStream *inputStream, *outputStream;
CslDriver *cslDriver;
int requestedFragmentSize;
int requestedFragmentCount;
const char *cslDriverName;
std::vector<CslPollFD> cslFds, cslOldFds;
int csl2iomanager(int cslTypes);
void updateFds();
void notifyIO(int fd, int types);
static void handleRead(void *user_data, CslPcmStream *stream);
static void handleWrite(void *user_data, CslPcmStream *stream);
public:
AudioIOCSL(const char *driverName = 0);
void setParam(AudioParam param, int& value);
int getParam(AudioParam param);
bool open();
void close();
int read(void *buffer, int size);
int write(void *buffer, int size);
};
REGISTER_AUDIO_IO(AudioIOCSL,"csl","Common Sound Layer");
class AudioIOCSLFactory : public AudioIOFactory {
protected:
const char *driverName;
std::string _name;
std::string _fullName;
public:
AudioIOCSLFactory(const char *driverName)
: driverName(driverName)
{
_name = "csl-";
_name += driverName;
_fullName = "Common Sound Layer (";
_fullName += driverName;
_fullName += ")";
}
virtual ~AudioIOCSLFactory()
{
}
AudioIO *createAudioIO() { return new AudioIOCSL(driverName); }
virtual const char *name() { return _name.c_str(); }
virtual const char *fullName() { return _fullName.c_str(); }
};
static class AudioIOCSLInit {
protected:
std::list<AudioIOCSLFactory *> factories;
public:
AudioIOCSLInit()
{
unsigned int i,n;
const char **drivers = csl_list_drivers(&n);
for(i = 0; i < n; i++)
factories.push_back(new AudioIOCSLFactory(drivers[i]));
}
~AudioIOCSLInit()
{
std::list<AudioIOCSLFactory *>::iterator i;
for(i = factories.begin(); i != factories.end(); i++)
delete (*i);
factories.clear();
}
} aci;
};
using namespace std;
using namespace Arts;
AudioIOCSL::AudioIOCSL(const char *driverName)
: cslDriverName(driverName)
{
/*
* default parameters
*/
param(samplingRate) = 44100;
paramStr(deviceName) = "todo";
requestedFragmentSize = param(fragmentSize) = 1024;
requestedFragmentCount = param(fragmentCount) = 7;
param(channels) = 2;
param(direction) = 2;
#ifdef WORDS_BIGENDIAN
param(format) = 17;
#else
param(format) = 16;
#endif
}
bool AudioIOCSL::open()
{
string& errorMsg = paramStr(lastError);
string& _deviceName = paramStr(deviceName);
int& _channels = param(channels);
int& _fragmentSize = param(fragmentSize);
int& _fragmentCount = param(fragmentCount);
int& _samplingRate = param(samplingRate);
int& _format = param(format);
int fmt = 0;
char *env = 0;
if(cslDriverName && strcmp(cslDriverName, "arts") == 0)
env = arts_strdup_printf("ARTS_SERVER=%s",_deviceName.c_str());
if(env)
{
putenv(env);
arts_debug("AudioIOCsl: set %s\n",env);
}
CslErrorType error;
error = csl_driver_init(cslDriverName, &cslDriver); /* choose backend */
if(env)
{
putenv("ARTS_SERVER");
free(env);
}
if (error)
{
errorMsg = "unable to initialize CSL driver: ";
errorMsg += csl_strerror(error);
return false;
}
if(_format == 8)
fmt = CSL_PCM_FORMAT_U8;
else if(_format == 16)
fmt = CSL_PCM_FORMAT_S16_LE;
else if(_format == 17)
fmt = CSL_PCM_FORMAT_S16_BE;
inputStream = outputStream = 0;
if(param(direction) & directionRead)
{
/* open PCM output stream */
error = csl_pcm_open_output(cslDriver,
"artsd output",
_samplingRate,
_channels,
fmt, &inputStream);
if (error)
{
errorMsg = "failed to open CSL input stream: ";
errorMsg += csl_strerror(error);
return false;
}
csl_pcm_set_callback(inputStream, handleRead, 0, 0);
}
if(param(direction) & directionWrite)
{
/* open PCM output stream */
error = csl_pcm_open_output(cslDriver,
"artsd output",
_samplingRate,
_channels,
fmt, &outputStream);
if (error)
{
close();
errorMsg = "failed to open CSL output stream: ";
errorMsg += csl_strerror(error);
return false;
}
csl_pcm_set_callback(outputStream, handleWrite, 0, 0);
}
#if 0
if (_format && (ossBits(gotFormat) != ossBits(requestedFormat)))
{
char details[80];
sprintf(details," (_format = %d, asked driver to give %d, got %d)",
_format, requestedFormat, gotFormat);
_error = "Can't set playback format";
_error += details;
close();
return false;
}
if(gotFormat == AFMT_U8)
_format = 8;
else if(gotFormat == AFMT_S16_LE)
_format = 16;
else if(gotFormat == AFMT_S16_BE)
_format = 17;
else
{
char details[80];
sprintf(details," (_format = %d, asked driver to give %d, got %d)",
_format, requestedFormat, gotFormat);
_error = "unknown format given by driver";
_error += details;
close();
return false;
}
int stereo=-1; /* 0=mono, 1=stereo */
if(_channels == 1)
{
stereo = 0;
}
if(_channels == 2)
{
stereo = 1;
}
if(stereo == -1)
{
_error = "internal error; set channels to 1 (mono) or 2 (stereo)";
close();
return false;
}
int requeststereo = stereo;
if (ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo)==-1)
{
_error = "SNDCTL_DSP_STEREO failed - ";
_error += strerror(errno);
close();
return false;
}
if (requeststereo != stereo)
{
_error = "audio device doesn't support number of requested channels";
close();
return false;
}
int speed = _samplingRate;
if (ioctl(audio_fd, SNDCTL_DSP_SPEED, &speed)==-1)
{
_error = "SNDCTL_DSP_SPEED failed - ";
_error += strerror(errno);
close();
return false;
}
/*
* Some soundcards seem to be able to only supply "nearly" the requested
* sampling rate, especially PAS 16 cards seem to quite radical supplying
* something different than the requested sampling rate ;)
*
* So we have a quite large tolerance here (when requesting 44100 Hz, it
* will accept anything between 38690 Hz and 49510 Hz). Most parts of the
* aRts code will do resampling where appropriate, so it shouldn't affect
* sound quality.
*/
int tolerance = _samplingRate/10+1000;
if (abs(speed-_samplingRate) > tolerance)
{
_error = "can't set requested samplingrate";
char details[80];
sprintf(details," (requested rate %d, got rate %d)",
_samplingRate, speed);
_error += details;
close();
return false;
}
_samplingRate = speed;
/*
* set the fragment settings to what the user requested
*/
_fragmentSize = requestedFragmentSize;
_fragmentCount = requestedFragmentCount;
/*
* lower 16 bits are the fragment size (as 2^S)
* higher 16 bits are the number of fragments
*/
int frag_arg = 0;
int size = _fragmentSize;
while(size > 1) { size /= 2; frag_arg++; }
frag_arg += (_fragmentCount << 16);
if(ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_arg) == -1)
{
char buffer[1024];
_error = "can't set requested fragments settings";
sprintf(buffer,"size%d:count%d\n",_fragmentSize,_fragmentCount);
close();
return false;
}
/*
* now see what we really got as cards aren't required to supply what
* we asked for
*/
audio_buf_info info;
if(ioctl(audio_fd,SNDCTL_DSP_GETOSPACE, &info) == -1)
{
_error = "can't retrieve fragment settings";
close();
return false;
}
// update fragment settings with what we got
_fragmentSize = info.fragsize;
_fragmentCount = info.fragstotal;
artsdebug("buffering: %d fragments with %d bytes "
"(audio latency is %1.1f ms)", _fragmentCount, _fragmentSize,
(float)(_fragmentSize*_fragmentCount) /
(float)(2.0 * _samplingRate * _channels)*1000.0);
/*
* Workaround for broken kernel drivers: usually filling up the audio
* buffer is _only_ required if _fullDuplex is true. However, there
* are kernel drivers around (especially everything related to ES1370/1371)
* which will not trigger select()ing the file descriptor unless we have
* written something first.
*/
char *zbuffer = (char *)calloc(sizeof(char), _fragmentSize);
if(_format == 8)
for(int zpos = 0; zpos < _fragmentSize; zpos++)
zbuffer[zpos] |= 0x80;
for(int fill = 0; fill < _fragmentCount; fill++)
{
int len = ::write(audio_fd,zbuffer,_fragmentSize);
if(len != _fragmentSize)
{
arts_debug("AudioIOCSL: failed prefilling audio buffer (might cause synchronization problems in conjunction with full duplex)");
fill = _fragmentCount+1;
}
}
free(zbuffer);
/*
* Triggering - the original aRts code did this for full duplex:
*
* - stop audio i/o using SETTRIGGER(~(PCM_ENABLE_INPUT|PCM_ENABLE_OUTPUT))
* - fill buffer (see zbuffer code two lines above)
* - start audio i/o using SETTRIGGER(PCM_ENABLE_INPUT|PCM_ENABLE_OUTPUT)
*
* this should guarantee synchronous start of input/output. Today, it
* seems there are too many broken drivers around for this.
*/
if(device_caps & DSP_CAP_TRIGGER)
{
int enable_bits = 0;
if(param(direction) & 1) enable_bits |= PCM_ENABLE_INPUT;
if(param(direction) & 2) enable_bits |= PCM_ENABLE_OUTPUT;
if(ioctl(audio_fd,SNDCTL_DSP_SETTRIGGER, &enable_bits) == -1)
{
_error = "can't start sound i/o";
close();
return false;
}
}
#endif
updateFds();
return true;
}
void AudioIOCSL::close()
{
if(inputStream)
{
csl_pcm_close(inputStream);
inputStream = 0;
}
if(outputStream)
{
csl_pcm_close(outputStream);
outputStream = 0;
}
updateFds();
}
void AudioIOCSL::setParam(AudioParam p, int& value)
{
switch(p)
{
case fragmentSize:
param(p) = requestedFragmentSize = value;
break;
case fragmentCount:
param(p) = requestedFragmentCount = value;
break;
default:
param(p) = value;
break;
}
}
int AudioIOCSL::getParam(AudioParam p)
{
CslErrorType error;
CslPcmStatus status;
switch(p)
{
case canRead:
error = csl_pcm_get_status (inputStream, &status);
if (error) /* FIXME */
arts_fatal("unable to obtain csl stream status: %s",
csl_strerror (error));
updateFds();
return status.n_bytes_available;
break;
case canWrite:
error = csl_pcm_get_status(outputStream, &status);
if (error) /* FIXME */
arts_fatal("unable to obtain csl stream status: %s",
csl_strerror (error));
updateFds();
return status.n_bytes_available;
break;
case autoDetect:
/* CSL is pretty experimental currently */
return 1;
break;
default:
return param(p);
break;
}
}
int AudioIOCSL::read(void *buffer, int size)
{
arts_assert(inputStream != 0);
int result = csl_pcm_read(inputStream, size, buffer);
updateFds();
return result;
}
void AudioIOCSL::handleRead(void *, CslPcmStream *)
{
AudioSubSystem::the()->handleIO(AudioSubSystem::ioRead);
}
int AudioIOCSL::write(void *buffer, int size)
{
arts_assert(outputStream != 0);
int result = csl_pcm_write(outputStream, size, buffer);
updateFds();
return result;
}
void AudioIOCSL::handleWrite(void *, CslPcmStream *)
{
AudioSubSystem::the()->handleIO(AudioSubSystem::ioWrite);
}
/* mainloop integration: make CSL callbacks work inside the aRts mainloop */
int AudioIOCSL::csl2iomanager(int cslTypes)
{
/* FIXME: doublecheck this list */
int types = 0;
if(cslTypes & CSL_POLLIN)
types |= IOType::read;
if(cslTypes & CSL_POLLOUT)
types |= IOType::write;
if(cslTypes & CSL_POLLERR)
types |= IOType::except;
return types;
}
void AudioIOCSL::updateFds()
{
unsigned int n_fds = csl_poll_count_fds(cslDriver);
CslPollFD *newFds = g_newa(CslPollFD, n_fds);
unsigned int have_fds = csl_poll_get_fds(cslDriver, n_fds, newFds);
arts_assert(have_fds == n_fds);
cslFds.clear();
unsigned int i;
for(i = 0; i < have_fds; i++)
cslFds.push_back(newFds[i]);
/* FIXME: if csl provided a flag for this, we could save some work here */
bool fdsChanged;
if(cslFds.size() == cslOldFds.size())
{
fdsChanged = false;
for(i = 0; i < have_fds; i++)
{
if(cslFds[i].events != cslOldFds[i].events)
fdsChanged = true;
if(cslFds[i].fd != cslOldFds[i].fd)
fdsChanged = true;
}
}
else
{
fdsChanged = true;
}
if(!fdsChanged)
return;
vector<CslPollFD>::iterator ci;
/* remove old watches */
/*
* UGLY! due to broken API, we can only remove all watches here, and not
* do anything selectively - its not a problem for the code here, but it
* might be a problem elsewhere. Unfortunately, it can't be fixed without
* breaking BC.
*/
Dispatcher::the()->ioManager()->remove(this, IOType::all);
arts_debug("AudioIOCSL::updateFds(): removing watches");
/* add new watches */
for(ci = cslFds.begin(); ci < cslFds.end(); ci++)
{
int types = csl2iomanager(ci->events);
if(types)
{
Dispatcher::the()->ioManager()->watchFD(ci->fd, types, this);
arts_debug("AudioIOCSL::updateFds(): adding watch on %d", ci->fd);
}
}
cslOldFds = cslFds;
}
void AudioIOCSL::notifyIO(int fd, int type)
{
vector<CslPollFD>::iterator fi;
for(fi = cslFds.begin(); fi != cslFds.end(); fi++)
{
if(fi->fd == fd)
{
int ftype = csl2iomanager(fi->events);
fi->revents = 0;
if(type & ftype & IOType::read)
fi->revents |= CSL_POLLIN;
if(type & ftype & IOType::write)
fi->revents |= CSL_POLLOUT;
if(type & ftype & IOType::except)
fi->revents |= CSL_POLLERR;
if(fi->revents)
csl_poll_handle_fds(cslDriver, 1, &(*fi));
}
}
updateFds();
}
#endif