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fluid_pulse.c
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fluid_pulse.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_pulse.c
*
* Audio driver for PulseAudio.
*
*/
#include "fluid_synth.h"
#include "fluid_adriver.h"
#include "fluid_settings.h"
#if PULSE_SUPPORT
#include <pulse/simple.h>
#include <pulse/error.h>
/** fluid_pulse_audio_driver_t
*
* This structure should not be accessed directly. Use audio port
* functions instead.
*/
typedef struct
{
fluid_audio_driver_t driver;
pa_simple *pa_handle;
fluid_audio_func_t callback;
void *data;
int buffer_size;
fluid_thread_t *thread;
int cont;
float *left;
float *right;
float *buf;
} fluid_pulse_audio_driver_t;
static fluid_thread_return_t fluid_pulse_audio_run(void *d);
static fluid_thread_return_t fluid_pulse_audio_run2(void *d);
void fluid_pulse_audio_driver_settings(fluid_settings_t *settings)
{
fluid_settings_register_str(settings, "audio.pulseaudio.server", "default", 0);
fluid_settings_register_str(settings, "audio.pulseaudio.device", "default", 0);
fluid_settings_register_str(settings, "audio.pulseaudio.media-role", "music", 0);
fluid_settings_register_int(settings, "audio.pulseaudio.adjust-latency", 1, 0, 1,
FLUID_HINT_TOGGLED);
}
fluid_audio_driver_t *
new_fluid_pulse_audio_driver(fluid_settings_t *settings,
fluid_synth_t *synth)
{
return new_fluid_pulse_audio_driver2(settings, NULL, synth);
}
fluid_audio_driver_t *
new_fluid_pulse_audio_driver2(fluid_settings_t *settings,
fluid_audio_func_t func, void *data)
{
fluid_pulse_audio_driver_t *dev;
pa_sample_spec samplespec;
pa_buffer_attr bufattr;
double sample_rate;
int period_size, period_bytes, adjust_latency, periods;
char *server = NULL;
char *device = NULL;
char *media_role = NULL;
int realtime_prio = 0;
int err = 0;
float *left = NULL,
*right = NULL,
*buf = NULL;
dev = FLUID_NEW(fluid_pulse_audio_driver_t);
if(dev == NULL)
{
FLUID_LOG(FLUID_ERR, "Out of memory");
return NULL;
}
FLUID_MEMSET(dev, 0, sizeof(fluid_pulse_audio_driver_t));
fluid_settings_getint(settings, "audio.periods", &periods);
fluid_settings_getint(settings, "audio.period-size", &period_size);
fluid_settings_getnum(settings, "synth.sample-rate", &sample_rate);
fluid_settings_dupstr(settings, "audio.pulseaudio.server", &server); /* ++ alloc server string */
fluid_settings_dupstr(settings, "audio.pulseaudio.device", &device); /* ++ alloc device string */
fluid_settings_dupstr(settings, "audio.pulseaudio.media-role", &media_role); /* ++ alloc media-role string */
fluid_settings_getint(settings, "audio.realtime-prio", &realtime_prio);
fluid_settings_getint(settings, "audio.pulseaudio.adjust-latency", &adjust_latency);
if(media_role != NULL)
{
if(FLUID_STRCMP(media_role, "") != 0)
{
g_setenv("PULSE_PROP_media.role", media_role, TRUE);
}
FLUID_FREE(media_role); /* -- free media_role string */
}
if(server && FLUID_STRCMP(server, "default") == 0)
{
FLUID_FREE(server); /* -- free server string */
server = NULL;
}
if(device && FLUID_STRCMP(device, "default") == 0)
{
FLUID_FREE(device); /* -- free device string */
device = NULL;
}
dev->data = data;
dev->callback = func;
dev->cont = 1;
dev->buffer_size = period_size;
samplespec.format = PA_SAMPLE_FLOAT32NE;
samplespec.channels = 2;
samplespec.rate = sample_rate;
period_bytes = period_size * sizeof(float) * 2;
bufattr.maxlength = adjust_latency ? -1 : period_bytes * periods;
bufattr.tlength = period_bytes;
bufattr.minreq = -1;
bufattr.prebuf = -1; /* Just initialize to same value as tlength */
bufattr.fragsize = -1; /* Not used */
dev->pa_handle = pa_simple_new(server, "FluidSynth", PA_STREAM_PLAYBACK,
device, "FluidSynth output", &samplespec,
NULL, /* pa_channel_map */
&bufattr,
&err);
if(!dev->pa_handle || err != PA_OK)
{
FLUID_LOG(FLUID_ERR, "Failed to create PulseAudio connection, because pa_simple_new() failed with error: %s", pa_strerror(err));
goto error_recovery;
}
FLUID_LOG(FLUID_INFO, "Using PulseAudio driver");
if(func != NULL)
{
left = FLUID_ARRAY(float, period_size);
right = FLUID_ARRAY(float, period_size);
if(left == NULL || right == NULL)
{
FLUID_LOG(FLUID_ERR, "Out of memory.");
goto error_recovery;
}
}
buf = FLUID_ARRAY(float, period_size * 2);
if(buf == NULL)
{
FLUID_LOG(FLUID_ERR, "Out of memory.");
goto error_recovery;
}
dev->left = left;
dev->right = right;
dev->buf = buf;
/* Create the audio thread */
dev->thread = new_fluid_thread("pulse-audio", func ? fluid_pulse_audio_run2 : fluid_pulse_audio_run,
dev, realtime_prio, FALSE);
if(!dev->thread)
{
goto error_recovery;
}
FLUID_FREE(server); /* -- free server string */
FLUID_FREE(device); /* -- free device string */
return (fluid_audio_driver_t *) dev;
error_recovery:
FLUID_FREE(server); /* -- free server string */
FLUID_FREE(device); /* -- free device string */
FLUID_FREE(left);
FLUID_FREE(right);
FLUID_FREE(buf);
delete_fluid_pulse_audio_driver((fluid_audio_driver_t *) dev);
return NULL;
}
void delete_fluid_pulse_audio_driver(fluid_audio_driver_t *p)
{
fluid_pulse_audio_driver_t *dev = (fluid_pulse_audio_driver_t *) p;
fluid_return_if_fail(dev != NULL);
dev->cont = 0;
if(dev->thread)
{
fluid_thread_join(dev->thread);
delete_fluid_thread(dev->thread);
}
if(dev->pa_handle)
{
pa_simple_free(dev->pa_handle);
}
FLUID_FREE(dev->left);
FLUID_FREE(dev->right);
FLUID_FREE(dev->buf);
FLUID_FREE(dev);
}
/* Thread without audio callback, more efficient */
static fluid_thread_return_t
fluid_pulse_audio_run(void *d)
{
fluid_pulse_audio_driver_t *dev = (fluid_pulse_audio_driver_t *) d;
float *buf = dev->buf;
int buffer_size = dev->buffer_size;
int err = 0;
while(dev->cont)
{
fluid_synth_write_float(dev->data, buffer_size, buf, 0, 2, buf, 1, 2);
if(pa_simple_write(dev->pa_handle, buf,
buffer_size * sizeof(float) * 2, &err) < 0)
{
FLUID_LOG(FLUID_ERR, "Error writing to PulseAudio connection: %s", pa_strerror(err));
break;
}
#if 0
{
pa_usec_t pa_latency = pa_simple_get_latency(dev->pa_handle, &err);
if(err == PA_OK)
{
FLUID_LOG(FLUID_DBG, "PulseAudio latency: %d ms", (int) pa_latency / 1000);
}
}
#endif
} /* while (dev->cont) */
return FLUID_THREAD_RETURN_VALUE;
}
static fluid_thread_return_t
fluid_pulse_audio_run2(void *d)
{
fluid_pulse_audio_driver_t *dev = (fluid_pulse_audio_driver_t *) d;
fluid_synth_t *synth = (fluid_synth_t *)(dev->data);
float *left = dev->left,
*right = dev->right,
*buf = dev->buf;
float *handle[2];
int buffer_size = dev->buffer_size;
int err = 0;
int i;
handle[0] = left;
handle[1] = right;
while(dev->cont)
{
FLUID_MEMSET(left, 0, buffer_size * sizeof(float));
FLUID_MEMSET(right, 0, buffer_size * sizeof(float));
(*dev->callback)(synth, buffer_size, 0, NULL, 2, handle);
/* Interleave the floating point data */
for(i = 0; i < buffer_size; i++)
{
buf[i * 2] = left[i];
buf[i * 2 + 1] = right[i];
}
if(pa_simple_write(dev->pa_handle, buf,
buffer_size * sizeof(float) * 2, &err) < 0)
{
FLUID_LOG(FLUID_ERR, "Error writing to PulseAudio connection: %s", pa_strerror(err));
break;
}
#if 0
{
pa_usec_t pa_latency = pa_simple_get_latency(dev->pa_handle, &err);
if(err == PA_OK)
{
FLUID_LOG(FLUID_DBG, "PulseAudio latency: %d ms", (int) pa_latency / 1000);
}
}
#endif
} /* while (dev->cont) */
return FLUID_THREAD_RETURN_VALUE;
}
#endif /* PULSE_SUPPORT */