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/*
** ClanLib SDK
** Copyright (c) 1997-2005 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
** (if your name is missing here, please add it)
*/
#include "Sound/precomp.h"
#include "soundoutput_generic.h"
#include "soundbuffer_session_generic.h"
#include "API/Core/System/threadfunc_v0.h"
#include "API/Sound/soundfilter.h"
#include <cstring>
/////////////////////////////////////////////////////////////////////////////
// CL_SoundOutput_Generic construction:
CL_SoundOutput_Generic::CL_SoundOutput_Generic(int mixing_frequency) :
mixing_frequency(mixing_frequency), volume(1.0f), pan(0.0f), mix_buffer_size(0), has_sound(true), ref_count(0)
{
mix_buffers[0] = 0;
mix_buffers[1] = 0;
temp_buffers[0] = 0;
temp_buffers[1] = 0;
stereo_buffer = 0;
}
CL_SoundOutput_Generic::~CL_SoundOutput_Generic()
{
int size = filters.size();
for (int i=0; i<size; i++) if (delete_filters[i]) delete filters[i];
delete[] stereo_buffer;
delete[] mix_buffers[0];
delete[] mix_buffers[1];
delete[] temp_buffers[0];
delete[] temp_buffers[1];
}
/////////////////////////////////////////////////////////////////////////////
// CL_SoundOutput_Generic attributes:
/////////////////////////////////////////////////////////////////////////////
// CL_SoundOutput_Generic operations:
void CL_SoundOutput_Generic::add_ref()
{
ref_count++;
}
void CL_SoundOutput_Generic::release_ref()
{
if (--ref_count == 0)
delete this;
}
void CL_SoundOutput_Generic::play_session(CL_MutexSharedPtr<CL_SoundBuffer_Session_Generic> session)
{
CL_MutexSection mutex_lock(&mutex);
sessions.push_back(session);
}
void CL_SoundOutput_Generic::stop_session(CL_MutexSharedPtr<CL_SoundBuffer_Session_Generic> session)
{
CL_MutexSection mutex_lock(&mutex);
sessions.remove(session);
}
void CL_SoundOutput_Generic::start_mixer_thread()
{
thread = CL_Thread(new CL_ThreadFunc_Runnable_v0<CL_SoundOutput_Generic>(this, &CL_SoundOutput_Generic::mixer_thread));
thread.start();
thread.set_priority(cl_priority_highest);
}
void CL_SoundOutput_Generic::stop_mixer_thread()
{
CL_MutexSection mutex_lock(&mutex);
stop_mixer.set_flag();
mutex_lock.leave();
if (thread.is_initialized())
{
thread.wait();
}
thread = CL_Thread();
}
void CL_SoundOutput_Generic::mix_fragment()
{
if (get_fragment_size() != mix_buffer_size)
{
delete[] stereo_buffer; stereo_buffer = 0;
delete[] mix_buffers[0]; mix_buffers[0] = 0;
delete[] mix_buffers[1]; mix_buffers[1] = 0;
delete[] temp_buffers[0]; temp_buffers[0] = 0;
delete[] temp_buffers[1]; temp_buffers[1] = 0;
mix_buffer_size = get_fragment_size();
mix_buffers[0] = new int[mix_buffer_size];
mix_buffers[1] = new int[mix_buffer_size];
temp_buffers[0] = new int[mix_buffer_size];
temp_buffers[1] = new int[mix_buffer_size];
stereo_buffer = new short[mix_buffer_size*2];
memset(stereo_buffer, 0, sizeof(short)*mix_buffer_size*2);
}
// Clear channel mixing buffers:
memset(mix_buffers[0], 0, sizeof(int)*mix_buffer_size);
memset(mix_buffers[1], 0, sizeof(int)*mix_buffer_size);
// Mix playing soundbuffers into mixing buffers:
CL_MutexSection mutex_lock(&mutex);
std::vector< CL_MutexSharedPtr<CL_SoundBuffer_Session_Generic> > ended_sessions;
std::list< CL_MutexSharedPtr<CL_SoundBuffer_Session_Generic> >::iterator it;
for (it = sessions.begin(); it != sessions.end(); ++it)
{
CL_MutexSharedPtr<CL_SoundBuffer_Session_Generic> session = *it;
bool playing = session->mix_to(mix_buffers, temp_buffers, mix_buffer_size, 2);
if (!playing) ended_sessions.push_back(session);
}
// Apply global filters to mixing buffers:
int size_filters = filters.size();
int i;
for (i = 0; i < size_filters; i++)
{
filters[i]->filter(mix_buffers, mix_buffer_size, 2);
}
// Release any sessions pending for removal:
int size_ended_sessions = ended_sessions.size();
for (i = 0; i < size_ended_sessions; i++) stop_session(ended_sessions[i]);
mutex_lock.leave();
// Make sure values stay inside 16 bit range:
for (int chan = 0; chan < 2; chan++)
{
for (int k=0; k<mix_buffer_size; k++)
{
if (mix_buffers[chan][k] > 32767) mix_buffers[chan][k] = 32767;
else if (mix_buffers[chan][k] < -32767) mix_buffers[chan][k] = -32767;
else mix_buffers[chan][k] = mix_buffers[chan][k];
}
}
// Calculate volume on left and right channel:
double left_pan = 1-pan;
double right_pan = 1+pan;
if (left_pan < 0.0) left_pan = 0.0;
if (left_pan > 1.0) left_pan = 1.0;
if (right_pan < 0.0) right_pan = 0.0;
if (right_pan > 1.0) right_pan = 1.0;
if (volume < 0.0) volume = 0.0;
if (volume > 1.0) volume = 1.0;
double left_volume = volume * left_pan;
double right_volume = volume * right_pan;
// Interleave channels before sending them to sound card:
short *ptr = stereo_buffer;
for (int k=0; k<mix_buffer_size; k++)
{
*(ptr++) = short(mix_buffers[0][k]*left_volume);
*(ptr++) = short(mix_buffers[1][k]*right_volume);
}
}
/////////////////////////////////////////////////////////////////////////////
// CL_SoundOutput_Generic implementation:
void CL_SoundOutput_Generic::mixer_thread()
{
while (true)
{
CL_MutexSection mutex_lock(&mutex);
if (stop_mixer.get_flag()) break;
mutex_lock.leave();
// Mix some audio:
mix_fragment();
// Send mixed data to sound card:
write_fragment(stereo_buffer);
// Wait for soundcard to want more:
wait();
}
}
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