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fluid_portaudio.c
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fluid_portaudio.c
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/* FluidSynth - A Software Synthesizer
*
* Copyright (C) 2003 Peter Hanappe and others.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA
*/
/* fluid_portaudio.c
*
* Drivers for the PortAudio API : www.portaudio.com
* Implementation files for PortAudio on each platform have to be added
*
* Stephane Letz (letz@grame.fr) Grame
* 12/20/01 Adapdation for new audio drivers
*
* Josh Green <jgreen@users.sourceforge.net>
* 2009-01-28 Overhauled for PortAudio 19 API and current FluidSynth API (was broken)
*/
#include "fluid_synth.h"
#include "fluid_settings.h"
#include "fluid_adriver.h"
#if PORTAUDIO_SUPPORT
#include <portaudio.h>
/** fluid_portaudio_driver_t
*
* This structure should not be accessed directly. Use audio port
* functions instead.
*/
typedef struct
{
fluid_audio_driver_t driver;
fluid_synth_t *synth;
fluid_audio_callback_t read;
PaStream *stream;
} fluid_portaudio_driver_t;
static int
fluid_portaudio_run(const void *input, void *output, unsigned long frameCount,
const PaStreamCallbackTimeInfo *timeInfo,
PaStreamCallbackFlags statusFlags, void *userData);
#define PORTAUDIO_DEFAULT_DEVICE "PortAudio Default"
/**
* Checks if device_num is a valid device and returns the name of the portaudio device.
* A device is valid if it is an output device with at least 2 channels.
*
* @param device_num index of the portaudio device to check.
* @param name_ptr if device_num is valid, set to a unique device name, ignored otherwise
*
* The name returned is unique for each num_device index, so this
* name is useful to identify any available host audio device.
* This name is convenient for audio.portaudio.device setting.
*
* The format of the name is: device_index:host_api_name:host_device_name
*
* example: 5:MME:SB PCI
*
* 5: is the portaudio device index.
* MME: is the host API name.
* SB PCI: is the host device name.
*
* @return #FLUID_OK if device_num is a valid output device, #FLUID_FAILED otherwise.
* When #FLUID_OK, the name is returned in allocated memory. The caller must check
* the name pointer for a valid memory allocation and should free the memory.
*/
static int fluid_portaudio_get_device_name(int device_num, char **name_ptr)
{
const PaDeviceInfo *deviceInfo = Pa_GetDeviceInfo(device_num);
if(deviceInfo->maxOutputChannels >= 2)
{
const PaHostApiInfo *hostInfo = Pa_GetHostApiInfo(deviceInfo->hostApi);
/* The size of the buffer name for the following format:
device_index:host_api_name:host_device_name.
*/
int i = device_num;
size_t size = 0;
do
{
size++;
i = i / 10 ;
}
while(i); /* index size */
/* host API size + host device size + 2 separators + zero termination */
size += FLUID_STRLEN(hostInfo->name) + FLUID_STRLEN(deviceInfo->name) + 3u;
*name_ptr = FLUID_MALLOC(size);
if(*name_ptr)
{
/* the name is filled if allocation is successful */
FLUID_SPRINTF(*name_ptr, "%d:%s:%s", device_num,
hostInfo->name, deviceInfo->name);
}
return FLUID_OK; /* device_num is a valid device */
}
else
{
return FLUID_FAILED; /* device_num is an invalid device */
}
}
/**
* Initializes "audio.portaudio.device" setting with an options list of unique device names
* of available sound card devices.
* @param settings pointer to settings.
*/
void
fluid_portaudio_driver_settings(fluid_settings_t *settings)
{
int numDevices;
PaError err;
int i;
fluid_settings_register_str(settings, "audio.portaudio.device", PORTAUDIO_DEFAULT_DEVICE, 0);
fluid_settings_add_option(settings, "audio.portaudio.device", PORTAUDIO_DEFAULT_DEVICE);
err = Pa_Initialize();
if(err != paNoError)
{
FLUID_LOG(FLUID_ERR, "Error initializing PortAudio driver: %s",
Pa_GetErrorText(err));
return;
}
numDevices = Pa_GetDeviceCount();
if(numDevices < 0)
{
FLUID_LOG(FLUID_ERR, "PortAudio returned unexpected device count %d", numDevices);
}
else
{
for(i = 0; i < numDevices; i++)
{
char *name;
if(fluid_portaudio_get_device_name(i, &name) == FLUID_OK)
{
/* the device i is a valid output device */
if(name)
{
/* registers this name in the option list */
fluid_settings_add_option(settings, "audio.portaudio.device", name);
FLUID_FREE(name);
}
else
{
FLUID_LOG(FLUID_ERR, "Out of memory");
break;
}
}
}
}
/* done with PortAudio for now, may get reopened later */
err = Pa_Terminate();
if(err != paNoError)
{
printf("PortAudio termination error: %s\n", Pa_GetErrorText(err));
}
}
/**
* Creates the portaudio driver and opens the portaudio device
* indicated by audio.portaudio.device setting.
*
* @param settings pointer to settings
* @param synth the synthesizer instance
* @return pointer to the driver on success, NULL otherwise.
*/
fluid_audio_driver_t *
new_fluid_portaudio_driver(fluid_settings_t *settings, fluid_synth_t *synth)
{
fluid_portaudio_driver_t *dev = NULL;
PaStreamParameters outputParams;
char *device = NULL; /* the portaudio device name to work with */
double sample_rate; /* intended sample rate */
int period_size; /* intended buffer size */
PaError err;
dev = FLUID_NEW(fluid_portaudio_driver_t);
if(dev == NULL)
{
FLUID_LOG(FLUID_ERR, "Out of memory");
return NULL;
}
err = Pa_Initialize();
if(err != paNoError)
{
FLUID_LOG(FLUID_ERR, "Error initializing PortAudio driver: %s",
Pa_GetErrorText(err));
FLUID_FREE(dev);
return NULL;
}
FLUID_MEMSET(dev, 0, sizeof(fluid_portaudio_driver_t));
dev->synth = synth;
/* gets audio parameters from the settings */
fluid_settings_getint(settings, "audio.period-size", &period_size);
fluid_settings_getnum(settings, "synth.sample-rate", &sample_rate);
fluid_settings_dupstr(settings, "audio.portaudio.device", &device); /* ++ alloc device name */
memset(&outputParams, 0, sizeof(outputParams));
outputParams.channelCount = 2; /* For stereo output */
outputParams.suggestedLatency = (PaTime)period_size / sample_rate;
/* Locate the device if specified */
if(FLUID_STRCMP(device, PORTAUDIO_DEFAULT_DEVICE) != 0)
{
/* The intended device is not the default device name, so we search
a device among available devices */
int numDevices;
int i;
numDevices = Pa_GetDeviceCount();
if(numDevices < 0)
{
FLUID_LOG(FLUID_ERR, "PortAudio returned unexpected device count %d", numDevices);
goto error_recovery;
}
for(i = 0; i < numDevices; i++)
{
char *name;
if(fluid_portaudio_get_device_name(i, &name) == FLUID_OK)
{
/* the device i is a valid output device */
if(name)
{
/* We see if the name corresponds to audio.portaudio.device */
char found = (FLUID_STRCMP(device, name) == 0);
FLUID_FREE(name);
if(found)
{
/* the device index is found */
outputParams.device = i;
/* The search is finished */
break;
}
}
else
{
FLUID_LOG(FLUID_ERR, "Out of memory");
goto error_recovery;
}
}
}
if(i == numDevices)
{
FLUID_LOG(FLUID_ERR, "PortAudio device '%s' was not found", device);
goto error_recovery;
}
}
else
{
/* the default device will be used */
outputParams.device = Pa_GetDefaultOutputDevice();
}
/* The device is found. We set the sample format and the audio rendering
function suited to this format.
*/
if(fluid_settings_str_equal(settings, "audio.sample-format", "16bits"))
{
outputParams.sampleFormat = paInt16;
dev->read = fluid_synth_write_s16;
}
else if(fluid_settings_str_equal(settings, "audio.sample-format", "float"))
{
outputParams.sampleFormat = paFloat32;
dev->read = fluid_synth_write_float;
}
else
{
FLUID_LOG(FLUID_ERR, "Unknown sample format");
goto error_recovery;
}
/* PortAudio section */
/* Open an audio I/O stream. */
err = Pa_OpenStream(&dev->stream,
NULL, /* Input parameters */
&outputParams, /* Output parameters */
sample_rate,
period_size,
paNoFlag,
fluid_portaudio_run, /* callback */
dev);
if(err != paNoError)
{
FLUID_LOG(FLUID_ERR, "Error opening PortAudio stream: %s",
Pa_GetErrorText(err));
goto error_recovery;
}
err = Pa_StartStream(dev->stream); /* starts the I/O stream */
if(err != paNoError)
{
FLUID_LOG(FLUID_ERR, "Error starting PortAudio stream: %s",
Pa_GetErrorText(err));
goto error_recovery;
}
if(device)
{
FLUID_FREE(device); /* -- free device name */
}
return (fluid_audio_driver_t *)dev;
error_recovery:
if(device)
{
FLUID_FREE(device); /* -- free device name */
}
delete_fluid_portaudio_driver((fluid_audio_driver_t *)dev);
return NULL;
}
/* PortAudio callback
* fluid_portaudio_run
*/
static int
fluid_portaudio_run(const void *input, void *output, unsigned long frameCount,
const PaStreamCallbackTimeInfo *timeInfo,
PaStreamCallbackFlags statusFlags, void *userData)
{
fluid_portaudio_driver_t *dev = (fluid_portaudio_driver_t *)userData;
/* it's as simple as that: */
dev->read(dev->synth, frameCount, output, 0, 2, output, 1, 2);
return 0;
}
/*
* delete_fluid_portaudio_driver
*/
void
delete_fluid_portaudio_driver(fluid_audio_driver_t *p)
{
fluid_portaudio_driver_t *dev = (fluid_portaudio_driver_t *)p;
PaError err;
fluid_return_if_fail(dev != NULL);
/* PortAudio section */
if(dev->stream)
{
Pa_CloseStream(dev->stream);
}
err = Pa_Terminate();
if(err != paNoError)
{
printf("PortAudio termination error: %s\n", Pa_GetErrorText(err));
}
FLUID_FREE(dev);
}
#endif /* PORTAUDIO_SUPPORT */