/* PulseAudio Output.
*
* Copyright (C) 2016 Reece H. Dunn
*
* This file is part of pcaudiolib.
*
* pcaudiolib 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 3 of the License, or
* (at your option) any later version.
*
* pcaudiolib 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 pcaudiolib. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "audio_priv.h"
#ifdef HAVE_PULSE_SIMPLE_H
#include <pulse/error.h>
#include <pulse/simple.h>
#include <string.h>
#include <stdbool.h>
struct pulseaudio_object
{
struct audio_object vtable;
pa_sample_spec ss;
pa_simple *s;
char *device;
char *application_name;
char *description;
};
#define to_pulseaudio_object(object) container_of(object, struct pulseaudio_object, vtable)
int
pulseaudio_object_open(struct audio_object *object,
enum audio_object_format format,
uint32_t rate,
uint8_t channels)
{
struct pulseaudio_object *self = to_pulseaudio_object(object);
if (self->s)
return PA_ERR_EXIST;
self->ss.rate = rate;
self->ss.channels = channels;
switch (format)
{
case AUDIO_OBJECT_FORMAT_ALAW: self->ss.format = PA_SAMPLE_ALAW; break;
case AUDIO_OBJECT_FORMAT_ULAW: self->ss.format = PA_SAMPLE_ULAW; break;
case AUDIO_OBJECT_FORMAT_U8: self->ss.format = PA_SAMPLE_U8; break;
case AUDIO_OBJECT_FORMAT_S16LE: self->ss.format = PA_SAMPLE_S16LE; break;
case AUDIO_OBJECT_FORMAT_S16BE: self->ss.format = PA_SAMPLE_S16BE; break;
#ifdef PA_SAMPLE_S24LE
case AUDIO_OBJECT_FORMAT_S24LE: self->ss.format = PA_SAMPLE_S24LE; break;
case AUDIO_OBJECT_FORMAT_S24BE: self->ss.format = PA_SAMPLE_S24BE; break;
case AUDIO_OBJECT_FORMAT_S24_32LE: self->ss.format = PA_SAMPLE_S24_32LE; break;
case AUDIO_OBJECT_FORMAT_S24_32BE: self->ss.format = PA_SAMPLE_S24_32BE; break;
#endif
case AUDIO_OBJECT_FORMAT_S32LE: self->ss.format = PA_SAMPLE_S32LE; break;
case AUDIO_OBJECT_FORMAT_S32BE: self->ss.format = PA_SAMPLE_S32BE; break;
case AUDIO_OBJECT_FORMAT_FLOAT32LE: self->ss.format = PA_SAMPLE_FLOAT32LE; break;
case AUDIO_OBJECT_FORMAT_FLOAT32BE: self->ss.format = PA_SAMPLE_FLOAT32BE; break;
default: return PA_ERR_INVALID; // Invalid argument.
}
int error = 0;
self->s = pa_simple_new(NULL,
self->application_name,
PA_STREAM_PLAYBACK,
self->device,
self->description,
&self->ss,
NULL,
NULL,
&error);
return error;
}
void
pulseaudio_object_close(struct audio_object *object)
{
struct pulseaudio_object *self = to_pulseaudio_object(object);
if (self->s) {
pa_simple_free(self->s);
self->s = NULL;
}
}
void
pulseaudio_object_destroy(struct audio_object *object)
{
struct pulseaudio_object *self = to_pulseaudio_object(object);
free(self->device);
free(self->application_name);
free(self->description);
free(self);
}
int
pulseaudio_object_drain(struct audio_object *object)
{
struct pulseaudio_object *self = to_pulseaudio_object(object);
if (!self->s)
return 0;
int error = 0;
pa_simple_drain(self->s, &error);
return error;
}
int
pulseaudio_object_flush(struct audio_object *object)
{
struct pulseaudio_object *self = to_pulseaudio_object(object);
if (!self->s)
return 0;
int error = 0;
pa_simple_flush(self->s, &error);
return error;
}
int
pulseaudio_object_write(struct audio_object *object,
const void *data,
size_t bytes)
{
struct pulseaudio_object *self = to_pulseaudio_object(object);
if (!self->s)
return 0;
int error = 0;
pa_simple_write(self->s, data, bytes, &error);
return error;
}
const char *
pulseaudio_object_strerror(struct audio_object *object,
int error)
{
return pa_strerror(error);
}
static bool
pulseaudio_is_available(const char *device,
const char *application_name,
const char *description)
{
pa_sample_spec ss;
ss.format = PA_SAMPLE_S16LE;
ss.rate = 44100;
ss.channels = 1;
pa_simple *s = pa_simple_new(NULL,
application_name,
PA_STREAM_PLAYBACK,
device,
description,
&ss,
NULL,
NULL,
NULL);
if (!s)
return false;
pa_simple_free(s);
return true;
}
struct audio_object *
create_pulseaudio_object(const char *device,
const char *application_name,
const char *description)
{
if (!pulseaudio_is_available(device, application_name, description))
return NULL;
struct pulseaudio_object *self = malloc(sizeof(struct pulseaudio_object));
if (!self)
return NULL;
self->s = NULL;
self->device = device ? strdup(device) : NULL;
self->application_name = application_name ? strdup(application_name) : NULL;
self->description = description ? strdup(description) : NULL;
self->vtable.open = pulseaudio_object_open;
self->vtable.close = pulseaudio_object_close;
self->vtable.destroy = pulseaudio_object_destroy;
self->vtable.write = pulseaudio_object_write;
self->vtable.drain = pulseaudio_object_drain;
self->vtable.flush = pulseaudio_object_flush;
self->vtable.strerror = pulseaudio_object_strerror;
return &self->vtable;
}
#else
struct audio_object *
create_pulseaudio_object(const char *device,
const char *application_name,
const char *description)
{
return NULL;
}
#endif