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/*
** ClanLib SDK
** Copyright (c) 1997-2008 The ClanLib Team
**
** This software is provided 'as-is', without any express or implied
** warranty. In no event will the authors be held liable for any damages
** arising from the use of this software.
**
** Permission is granted to anyone to use this software for any purpose,
** including commercial applications, and to alter it and redistribute it
** freely, subject to the following restrictions:
**
** 1. The origin of this software must not be misrepresented; you must not
** claim that you wrote the original software. If you use this software
** in a product, an acknowledgment in the product documentation would be
** appreciated but is not required.
** 2. Altered source versions must be plainly marked as such, and must not be
** misrepresented as being the original software.
** 3. This notice may not be removed or altered from any source distribution.
**
** Note: Some of the libraries ClanLib may link to may have additional
** requirements or restrictions.
**
** File Author(s):
**
** Magnus Norddahl
** Hans de Goede
** (if your name is missing here, please add it)
*/
#include "Sound/precomp.h"
#include "soundoutput_alsa.h"
#include "API/Core/System/error.h"
#include "API/Core/System/cl_assert.h"
#include "API/Core/System/system.h"
#include "API/Core/System/log.h"
#ifdef __linux__
/////////////////////////////////////////////////////////////////////////////
// CL_SoundOutput_alsa construction:
CL_SoundOutput_alsa::CL_SoundOutput_alsa(int mixing_frequency) :
CL_SoundOutput_Generic(mixing_frequency), frames_in_buffer(4096),
frames_in_period(1024)
{
int rc;
snd_pcm_hw_params_t *hwparams;
rc = snd_pcm_open(&handle, "default", SND_PCM_STREAM_PLAYBACK, 0);
if (rc < 0)
{
CL_Log::log("warn", "ClanSound: Couldn't open sound device, disabling sound");
handle = NULL;
return;
}
snd_pcm_hw_params_alloca(&hwparams);
snd_pcm_hw_params_any(handle, hwparams);
snd_pcm_hw_params_set_access(handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED);
snd_pcm_hw_params_set_format(handle, hwparams, SND_PCM_FORMAT_S16);
snd_pcm_hw_params_set_channels(handle, hwparams, 2);
snd_pcm_hw_params_set_rate_near(handle, hwparams,
(unsigned int *)&this->mixing_frequency, 0);
snd_pcm_hw_params_set_buffer_size_near(handle, hwparams, &frames_in_buffer);
frames_in_period = frames_in_buffer / 4;
snd_pcm_hw_params_set_period_size_near(handle, hwparams, &frames_in_period, 0);
rc = snd_pcm_hw_params(handle, hwparams);
if (rc < 0)
{
CL_Log::log("warn", "ClanSound: Couldn't initialize sound device, disabling sound");
snd_pcm_close(handle);
handle = NULL;
return;
}
snd_pcm_hw_params_get_period_size(hwparams, &frames_in_period, 0);
start_mixer_thread();
}
CL_SoundOutput_alsa::~CL_SoundOutput_alsa()
{
stop_mixer_thread();
if (handle) {
snd_pcm_close(handle);
handle = NULL;
}
}
/////////////////////////////////////////////////////////////////////////////
// CL_SoundOutput_alsa operations:
void CL_SoundOutput_alsa::silence()
{
/* Note: not supported by all hardware! */
if (handle)
snd_pcm_pause(handle, 1);
}
bool CL_SoundOutput_alsa::is_full()
{
int rc;
snd_pcm_sframes_t delay;
if (handle == NULL) return false;
rc = snd_pcm_delay(handle, &delay);
if (rc < 0) {
CL_Log::log("debug", "ClanSound: snd_pcm_delay() failed!?");
return false;
}
/* See if there is more then one period free in the buffer */
return delay > (snd_pcm_sframes_t)(frames_in_buffer - frames_in_period);
}
int CL_SoundOutput_alsa::get_fragment_size()
{
return frames_in_period;
}
void CL_SoundOutput_alsa::write_fragment(short *data)
{
snd_pcm_sframes_t rc;
if (handle == NULL) return;
switch(snd_pcm_state(handle)) {
case SND_PCM_STATE_XRUN:
case SND_PCM_STATE_SUSPENDED:
snd_pcm_prepare(handle);
break;
case SND_PCM_STATE_PAUSED:
snd_pcm_pause(handle, 0);
break;
default:
break;
}
rc = snd_pcm_writei(handle, data, frames_in_period);
if (rc < 0)
CL_Log::log("debug", "ClanSound: snd_pcm_writei() failed!");
}
void CL_SoundOutput_alsa::wait()
{
if(handle == NULL)
{
CL_System::sleep(100);
return;
}
/* wait upto 1 second */
snd_pcm_wait(handle, 1000);
}
/////////////////////////////////////////////////////////////////////////////
// CL_SoundOutput_alsa implementation:
#endif
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