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/* -*- c-basic-offset: 8 -*-
rdesktop: A Remote Desktop Protocol client.
Sound Channel Process Functions - libao-driver
Copyright (C) Matthew Chapman <matthewc.unsw.edu.au> 2003-2008
Copyright (C) GuoJunBo <guojunbo@ict.ac.cn> 2003
Copyright (C) Michael Gernoth <mike@zerfleddert.de> 2005-2008
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 3 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, see <http://www.gnu.org/licenses/>.
*/
/*
* Oracle GPL Disclaimer: For the avoidance of doubt, except that if any license choice
* other than GPL or LGPL is available it will apply instead, Oracle elects to use only
* the General Public License version 2 (GPLv2) at this time for any software where
* a choice of GPL license versions is made available with the language indicating
* that GPLv2 or any later version may be used, or where a choice of which version
* of the GPL is applied is otherwise unspecified.
*/
#include "rdesktop.h"
#include "rdpsnd.h"
#include "rdpsnd_dsp.h"
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <ao/ao.h>
#include <sys/time.h>
#define WAVEOUTLEN 16
static ao_device *o_device = NULL;
static int default_driver;
static RD_BOOL reopened;
static char *libao_device = NULL;
void libao_play(void);
void
libao_add_fds(int *n, fd_set * rfds, fd_set * wfds, struct timeval *tv)
{
/* We need to be called rather often... */
if (o_device != NULL && !rdpsnd_queue_empty())
FD_SET(0, wfds);
}
void
libao_check_fds(fd_set * rfds, fd_set * wfds)
{
if (o_device == NULL)
return;
if (!rdpsnd_queue_empty())
libao_play();
}
RD_BOOL
libao_open(void)
{
ao_sample_format format;
ao_initialize();
if (libao_device)
{
default_driver = ao_driver_id(libao_device);
}
else
{
default_driver = ao_default_driver_id();
}
format.bits = 16;
format.channels = 2;
format.rate = 44100;
format.byte_format = AO_FMT_NATIVE;
o_device = ao_open_live(default_driver, &format, NULL);
if (o_device == NULL)
{
return False;
}
reopened = True;
return True;
}
void
libao_close(void)
{
/* Ack all remaining packets */
while (!rdpsnd_queue_empty())
{
rdpsnd_queue_next(0);
}
if (o_device != NULL)
ao_close(o_device);
o_device = NULL;
ao_shutdown();
}
RD_BOOL
libao_set_format(RD_WAVEFORMATEX * pwfx)
{
ao_sample_format format;
format.bits = pwfx->wBitsPerSample;
format.channels = pwfx->nChannels;
format.rate = 44100;
format.byte_format = AO_FMT_NATIVE;
if (o_device != NULL)
ao_close(o_device);
o_device = ao_open_live(default_driver, &format, NULL);
if (o_device == NULL)
{
return False;
}
if (rdpsnd_dsp_resample_set(44100, pwfx->wBitsPerSample, pwfx->nChannels) == False)
{
return False;
}
reopened = True;
return True;
}
void
libao_play(void)
{
struct audio_packet *packet;
STREAM out;
int len;
static long prev_s, prev_us;
unsigned int duration;
struct timeval tv;
int next_tick;
if (reopened)
{
reopened = False;
gettimeofday(&tv, NULL);
prev_s = tv.tv_sec;
prev_us = tv.tv_usec;
}
/* We shouldn't be called if the queue is empty, but still */
if (rdpsnd_queue_empty())
return;
packet = rdpsnd_queue_current_packet();
out = &packet->s;
next_tick = rdpsnd_queue_next_tick();
len = (WAVEOUTLEN > (out->end - out->p)) ? (out->end - out->p) : WAVEOUTLEN;
ao_play(o_device, (char *) out->p, len);
out->p += len;
gettimeofday(&tv, NULL);
duration = ((tv.tv_sec - prev_s) * 1000000 + (tv.tv_usec - prev_us)) / 1000;
if (packet->tick > next_tick)
next_tick += 65536;
if ((out->p == out->end) || duration > next_tick - packet->tick + 500)
{
unsigned int delay_us;
prev_s = tv.tv_sec;
prev_us = tv.tv_usec;
if (abs((next_tick - packet->tick) - duration) > 20)
{
DEBUG(("duration: %d, calc: %d, ", duration, next_tick - packet->tick));
DEBUG(("last: %d, is: %d, should: %d\n", packet->tick,
(packet->tick + duration) % 65536, next_tick % 65536));
}
delay_us = ((out->size / 4) * (1000000 / 44100));
rdpsnd_queue_next(delay_us);
}
}
struct audio_driver *
libao_register(char *options)
{
static struct audio_driver libao_driver;
memset(&libao_driver, 0, sizeof(libao_driver));
libao_driver.name = "libao";
libao_driver.description = "libao output driver, default device: system dependent";
libao_driver.add_fds = libao_add_fds;
libao_driver.check_fds = libao_check_fds;
libao_driver.wave_out_open = libao_open;
libao_driver.wave_out_close = libao_close;
libao_driver.wave_out_format_supported = rdpsnd_dsp_resample_supported;
libao_driver.wave_out_set_format = libao_set_format;
libao_driver.wave_out_volume = rdpsnd_dsp_softvol_set;
libao_driver.need_byteswap_on_be = 1;
libao_driver.need_resampling = 1;
if (options)
{
libao_device = xstrdup(options);
}
return &libao_driver;
}
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