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device.c
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device.c
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/*
* Copyright (C) 2012 Mark Hills <mark@pogo.org.uk>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2, as published by the Free Software Foundation.
*
* 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 version 2 for more details.
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
*/
#include <assert.h>
#include <stddef.h>
#include "device.h"
#include "player.h"
#include "timecoder.h"
void device_connect_timecoder(struct device *dv, struct timecoder *tc)
{
dv->timecoder = tc;
}
void device_connect_player(struct device *dv, struct player *pl)
{
dv->player = pl;
}
/*
* Return: the sample rate of the device in Hz
*/
unsigned int device_sample_rate(struct device *dv)
{
assert(dv->ops->sample_rate != NULL);
return dv->ops->sample_rate(dv);
}
/*
* Start the device inputting and outputting audio
*/
void device_start(struct device *dv)
{
if (dv->ops->start != NULL)
dv->ops->start(dv);
}
/*
* Stop the device
*/
void device_stop(struct device *dv)
{
if (dv->ops->stop != NULL)
dv->ops->stop(dv);
}
/*
* Clear (destruct) the device. The corresponding constructor is
* specific to each particular audio system
*/
void device_clear(struct device *dv)
{
if (dv->ops->clear != NULL)
dv->ops->clear(dv);
}
/*
* Get file descriptors which should be polled for this device
*
* Do not return anything for callback-based audio systems. If the
* return value is > 0, there must be a handle() function available.
*
* Return: the number of pollfd filled, or -1 on error
*/
ssize_t device_pollfds(struct device *dv, struct pollfd *pe, size_t z)
{
if (dv->ops->pollfds != NULL)
return dv->ops->pollfds(dv, pe, z);
else
return 0;
}
/*
* Handle any available input or output on the device
*
* This function can be called when there is activity on any file
* descriptor, not specifically one returned by this device.
*
* Return: 0 on success, or -1 if an error occured
*/
int device_handle(struct device *dv)
{
assert(dv->ops->handle != NULL);
return dv->ops->handle(dv);
}
/*
* Send audio from a device for processing
*
* Pre: buffer pcm contains n stereo samples
*/
void device_submit(struct device *dv, signed short *pcm, size_t n)
{
assert(dv->timecoder != NULL);
timecoder_submit(dv->timecoder, pcm, n);
}
/*
* Collect audio from the processing to send to a device
*
* Post: buffer pcm is filled with n stereo samples
*/
void device_collect(struct device *dv, signed short *pcm, size_t n)
{
assert(dv->player != NULL);
player_collect(dv->player, pcm, n);
}