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/* pulsesound.c: pulseaudio (Linux) sound I/O
Copyright (c) 2010-2019 Grzegorz Jablonski, Sergio Baldoví
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <config.h>
#include <stdio.h>
#include <string.h>
#include <libspectrum.h>
#include <pulse/error.h>
#include <pulse/simple.h>
#include <pulse/timeval.h>
#include "sound.h"
#define PULSEAUDIO_DEBUG 0
static pa_simple *pulse_s;
static int verbose = 0;
void
sound_lowlevel_end( void )
{
pa_simple_free( pulse_s );
}
int
sound_lowlevel_init( const char *device, int *freqptr, int *stereoptr )
{
pa_sample_spec ss;
pa_buffer_attr buf;
unsigned int n;
unsigned int val;
const char *option;
char tmp;
int err;
int bsize = 0;
int bdelay = 30; /* default to 30ms */
/* scan explicitly given parameters */
option = device;
while( option && *option ) {
tmp = '*';
if( ( err = sscanf( option, " tlength=%ims %n%c", &val, &n, &tmp ) > 0 ) &&
( tmp == ',' || strlen( option ) == n ) ) {
if( val < 1 ) {
fprintf( stderr, "Bad value for PULSEAUDIO tlength, using default\n" );
} else {
bdelay = val;
}
} else if( ( err = sscanf( option, " tlength=%i %n%c", &val, &n, &tmp ) > 0 ) &&
( tmp == ',' || strlen( option ) == n ) ) {
if( val < 1 ) {
fprintf( stderr, "Bad value for PULSEAUDIO tlength, using default\n" );
} else {
bsize = val;
}
} else if( ( err = sscanf( option, " verbose %n%c", &n, &tmp ) == 1 ) &&
( tmp == ',' || ( strlen( option ) == n ) ) ) {
verbose = 1;
}
option += n + ( tmp == ',' );
}
#if defined WORDS_BIGENDIAN
ss.format = PA_SAMPLE_S16BE;
#else
ss.format = PA_SAMPLE_S16LE;
#endif
ss.channels = ( *stereoptr )? 2 : 1;
ss.rate = *freqptr;
/* Reduce latency to 30ms or the user-defined value. pulseaudio does
not guarantee that */
buf.tlength = (bsize)? bsize :
pa_usec_to_bytes( bdelay * PA_USEC_PER_MSEC, &ss );
buf.maxlength = buf.tlength * 4;
buf.minreq = buf.tlength / 4;
buf.prebuf = (uint32_t) -1;
buf.fragsize = (uint32_t) -1;
if( verbose ) {
fprintf( stdout, "buffer requested: maxlength=%lu, tlength=%lu, prebuf=%lu,"
" minreq=%lu\n",
(unsigned long) buf.maxlength,
(unsigned long) buf.tlength,
(unsigned long) buf.prebuf,
(unsigned long) buf.minreq );
}
pulse_s = pa_simple_new( NULL, PACKAGE, PA_STREAM_PLAYBACK, NULL,
"Spectrum", &ss, NULL, &buf, &err );
if( pulse_s == NULL ) {
fprintf( stderr, "pulseaudio: pa_simple_new() failed: %s\n",
pa_strerror( err ) );
return 1;
}
return 0;
}
void
sound_lowlevel_frame( libspectrum_signed_word *data, int len )
{
int retval, error;
/* Measure sound lag */
if( PULSEAUDIO_DEBUG ) {
pa_usec_t latency;
latency = pa_simple_get_latency( pulse_s, &error );
if( latency == (pa_usec_t) - 1 ) {
fprintf( stderr, "pulseaudio: pa_simple_get_latency() failed: %s\n",
pa_strerror( error ) );
} else {
fprintf( stderr, "%0.0f ", (float)latency / PA_USEC_PER_MSEC );
}
}
retval = pa_simple_write( pulse_s, data, 2 * len, &error );
if( verbose && retval < 0 ) {
fprintf( stderr, "pulseaudio: pa_simple_write() failed: %s\n",
pa_strerror( error ) );
}
}
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