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/*
* AdPlay/UNIX - OPL2 audio player
* Copyright (C) 2001 - 2004 Simon Peter <dn.tlp@gmx.net>
*
* 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 2, 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, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "defines.h"
#include "alsa.h"
#define DEFAULT_DEVICE "default" // Default ALSA output device
ALSAPlayer::ALSAPlayer(Copl *nopl, const char *device, unsigned char bits,
int channels, int freq, unsigned long bufsize)
: EmuPlayer(nopl, bits, channels, freq, bufsize)
{
snd_pcm_hw_params_t *hwparams;
unsigned int nfreq = freq;
unsigned long nbufsize;
if(!device) device = DEFAULT_DEVICE;
snd_pcm_hw_params_malloc(&hwparams);
// Try to open audio device
if(snd_pcm_open(&pcm_handle, device, SND_PCM_STREAM_PLAYBACK, 0) < 0) {
message(MSG_ERROR, "error opening PCM device -- %s", device);
exit(EXIT_FAILURE);
}
// Init hwparams with full configuration space
if(snd_pcm_hw_params_any(pcm_handle, hwparams) < 0) {
message(MSG_ERROR, "cannot configure this PCM device -- %s", device);
exit(EXIT_FAILURE);
}
// Set access type
if(snd_pcm_hw_params_set_access(pcm_handle, hwparams,
SND_PCM_ACCESS_RW_INTERLEAVED) < 0) {
message(MSG_ERROR, "error setting access type");
exit(EXIT_FAILURE);
}
// Set sample format
if (snd_pcm_hw_params_set_format(pcm_handle, hwparams, bits == 16 ?
SND_PCM_FORMAT_S16 : SND_PCM_FORMAT_U8) < 0) {
message(MSG_ERROR, "error setting format");
exit(EXIT_FAILURE);
}
// Set sample rate (nearest possible)
if(snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &nfreq, 0) < 0) {
message(MSG_ERROR, "error setting sample rate");
exit(EXIT_FAILURE);
}
if(nfreq != (unsigned int)freq)
message(MSG_NOTE, "%d Hz sample rate not supported by your hardware, using "
"%d Hz instead", freq, nfreq);
// Set number of channels
if(snd_pcm_hw_params_set_channels(pcm_handle, hwparams, channels) < 0) {
message(MSG_ERROR, "error setting channels");
exit(EXIT_FAILURE);
}
// Set number of periods
if(snd_pcm_hw_params_set_periods(pcm_handle, hwparams, 4, 0) < 0) {
message(MSG_ERROR, "error setting periods");
exit(EXIT_FAILURE);
}
// Set the preferred buffer size (in samples)
if(snd_pcm_hw_params_set_buffer_size(pcm_handle, hwparams, bufsize / getsampsize()) < 0) {
if (snd_pcm_hw_params_get_buffer_size(hwparams, &nbufsize) < 0) {
message(MSG_ERROR, "error setting and getting buffer size");
exit(EXIT_FAILURE);
}
setbufsize(nbufsize);
message(MSG_NOTE, "couldn't set buffersize to %ld, using default of %ld instead", bufsize, nbufsize);
}
// Apply HW parameter settings to PCM device and prepare device
if(snd_pcm_hw_params(pcm_handle, hwparams) < 0) {
message(MSG_ERROR, "error setting HW params");
exit(EXIT_FAILURE);
}
snd_pcm_hw_params_free(hwparams);
}
ALSAPlayer::~ALSAPlayer()
{
// stop playback immediately
snd_pcm_drop(pcm_handle);
snd_pcm_close(pcm_handle);
}
void ALSAPlayer::output(const void *buf, unsigned long size)
{
if(snd_pcm_writei(pcm_handle, buf, size / getsampsize()) < 0)
snd_pcm_prepare(pcm_handle);
}
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