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quakeforge/libs/audio/targets/snd_alsa_0_9.c

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/*
snd_alsa_0_9.c
Support for ALSA 0.9 sound driver (cvs development version)
Copyright (C) 1999,2000 contributors of the QuakeForge project
Please see the file "AUTHORS" for a list of contributors
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
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, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
$Id$
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <sys/asoundlib.h>
#include "QF/console.h"
#include "QF/cvar.h"
#include "QF/plugin.h"
#include "QF/qargs.h"
#include "QF/sound.h"
static int snd_inited;
static snd_pcm_t *pcm;
static const char *pcmname = NULL;
size_t buffer_size;
int snd_blocked = 0;
volatile dma_t sn;
cvar_t *snd_stereo;
cvar_t *snd_rate;
cvar_t *snd_device;
cvar_t *snd_bits;
plugin_t plugin_info;
plugin_data_t plugin_info_data;
plugin_funcs_t plugin_info_funcs;
general_data_t plugin_info_general_data;
general_funcs_t plugin_info_general_funcs;
snd_output_data_t plugin_info_snd_output_data;
snd_output_funcs_t plugin_info_snd_output_funcs;
void
SNDDMA_Init_Cvars (void)
{
snd_stereo = Cvar_Get ("snd_stereo", "1", CVAR_ROM, NULL,
"sound stereo output");
snd_rate = Cvar_Get ("snd_rate", "0", CVAR_ROM, NULL,
"sound playback rate. 0 is system default");
snd_device = Cvar_Get ("snd_device", "", CVAR_ROM, NULL,
"sound device. \"\" is system default");
snd_bits = Cvar_Get ("snd_bits", "0", CVAR_ROM, NULL,
"sound sample depth. 0 is system default");
}
int SNDDMA_GetDMAPos (void);
qboolean
SNDDMA_Init (void)
{
int err;
int rate = -1, bps = -1, stereo = -1, frag_size;
snd_pcm_hw_params_t *hw;
snd_pcm_sw_params_t *sw;
snd_pcm_hw_params_alloca (&hw);
snd_pcm_sw_params_alloca (&sw);
if (snd_device->string[0])
pcmname = snd_device->string;
if (snd_bits->int_val) {
bps = snd_bits->int_val;
if (bps != 16 && bps != 8) {
Con_Printf ("Error: invalid sample bits: %d\n", bps);
return 0;
}
}
if (snd_rate->int_val) {
rate = snd_rate->int_val;
if (rate != 44100 && rate != 22050 && rate != 11025) {
Con_Printf ("Error: invalid sample rate: %d\n", rate);
return 0;
}
}
stereo = snd_stereo->int_val;
if (!pcmname)
pcmname = "plug:0,0";
if ((err = snd_pcm_open (&pcm, pcmname,
SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK)) < 0) {
Con_Printf ("Error: audio open error: %s\n", snd_strerror (err));
return 0;
}
Con_Printf ("Using PCM %s.\n", pcmname);
snd_pcm_hw_params_any (pcm, hw);
switch (rate) {
case -1:
if (snd_pcm_hw_params_set_rate_near (pcm, hw, 44100, 0) >= 0) {
frag_size = 256; /* assuming stereo 8 bit */
rate = 44100;
} else if (snd_pcm_hw_params_set_rate_near (pcm, hw, 22050, 0) >=
0) {
frag_size = 128; /* assuming stereo 8 bit */
rate = 22050;
} else if (snd_pcm_hw_params_set_rate_near (pcm, hw, 11025, 0) >=
0) {
frag_size = 64; /* assuming stereo 8 bit */
rate = 11025;
} else {
Con_Printf ("ALSA: no useable rates\n");
goto error;
}
break;
case 11025:
case 22050:
case 44100:
if (snd_pcm_hw_params_set_rate_near (pcm, hw, rate, 0) >= 0) {
frag_size = 64 * rate / 11025; /* assuming stereo 8 bit */
break;
}
/* Fall through */
default:
Con_Printf ("ALSA: desired rate not supported\n");
goto error;
}
switch (bps) {
case -1:
if (snd_pcm_hw_params_set_format (pcm, hw, SND_PCM_FORMAT_S16_LE)
>= 0) {
bps = 16;
} else if (snd_pcm_hw_params_set_format (pcm, hw,
SND_PCM_FORMAT_U8)
>= 0) {
bps = 8;
} else {
Con_Printf ("ALSA: no useable formats\n");
goto error;
}
break;
case 8:
case 16:
if (snd_pcm_hw_params_set_format (pcm, hw,
bps == 8 ? SND_PCM_FORMAT_U8 :
SND_PCM_FORMAT_S16) >= 0) {
break;
}
/* Fall through */
default:
Con_Printf ("ALSA: desired format not supported\n");
goto error;
}
if (snd_pcm_hw_params_set_access (pcm, hw,
SND_PCM_ACCESS_MMAP_INTERLEAVED) < 0) {
Con_Printf ("ALSA: interleaved is not supported\n");
goto error;
}
switch (stereo) {
case -1:
if (snd_pcm_hw_params_set_channels (pcm, hw, 2) >= 0) {
stereo = 1;
} else if (snd_pcm_hw_params_set_channels (pcm, hw, 1) >= 0) {
stereo = 0;
} else {
Con_Printf ("ALSA: no useable channels\n");
goto error;
}
break;
case 0:
case 1:
if (snd_pcm_hw_params_set_channels (pcm, hw, stereo ? 2 : 1) >= 0)
break;
/* Fall through */
default:
Con_Printf ("ALSA: desired channels not supported\n");
goto error;
}
snd_pcm_hw_params_set_period_size_near (pcm, hw, frag_size, 0);
err = snd_pcm_hw_params (pcm, hw);
if (err < 0) {
Con_Printf ("ALSA: unable to install hw params\n");
goto error;
}
snd_pcm_sw_params_current (pcm, sw);
snd_pcm_sw_params_set_start_threshold (pcm, sw, ~0U);
snd_pcm_sw_params_set_stop_threshold (pcm, sw, ~0U);
err = snd_pcm_sw_params (pcm, sw);
if (err < 0) {
Con_Printf ("ALSA: unable to install sw params\n");
goto error;
}
shm = &sn;
memset ((dma_t *) shm, 0, sizeof (*shm));
shm->splitbuffer = 0;
shm->channels = stereo + 1;
shm->submission_chunk = snd_pcm_hw_params_get_period_size (hw, 0); // don't
// mix less than this #
shm->samplepos = 0; // in mono samples
shm->samplebits = bps;
buffer_size = snd_pcm_hw_params_get_buffer_size (hw);
shm->samples = buffer_size * shm->channels; // mono samples in buffer
shm->speed = rate;
SNDDMA_GetDMAPos ();//XXX sets shm->buffer
Con_Printf ("%5d stereo\n", shm->channels - 1);
Con_Printf ("%5d samples\n", shm->samples);
Con_Printf ("%5d samplepos\n", shm->samplepos);
Con_Printf ("%5d samplebits\n", shm->samplebits);
Con_Printf ("%5d submission_chunk\n", shm->submission_chunk);
Con_Printf ("%5d speed\n", shm->speed);
Con_Printf ("0x%x dma buffer\n", (int) shm->buffer);
Con_Printf ("%5d total_channels\n", total_channels);
snd_inited = 1;
return 1;
error:
snd_pcm_close (pcm);
return 0;
}
int
SNDDMA_GetDMAPos (void)
{
snd_pcm_uframes_t offset;
snd_pcm_uframes_t nframes = shm->samples/shm->channels;
const snd_pcm_channel_area_t *areas;
if (!snd_inited)
return 0;
snd_pcm_mmap_begin (pcm, &areas, &offset, &nframes);
offset *= shm->channels;
nframes *= shm->channels;
shm->samplepos = offset;
shm->buffer = areas->addr;//XXX FIXME there's an area per channel
return shm->samplepos;
}
void
SNDDMA_Shutdown (void)
{
if (snd_inited) {
snd_pcm_close (pcm);
snd_inited = 0;
}
}
/*
SNDDMA_Submit
Send sound to device if buffer isn't really the dma buffer
*/
void
SNDDMA_Submit (void)
{
snd_pcm_uframes_t offset;
snd_pcm_uframes_t nframes;
const snd_pcm_channel_area_t *areas;
int state;
int count = *plugin_info_snd_output_data.paintedtime
- *plugin_info_snd_output_data.soundtime;
if (snd_blocked)
return;
nframes = count / shm->channels;
snd_pcm_mmap_begin (pcm, &areas, &offset, &nframes);
state = snd_pcm_state (pcm);
switch (state) {
case SND_PCM_STATE_PREPARED:
snd_pcm_mmap_commit (pcm, offset, nframes);
snd_pcm_start (pcm);
break;
case SND_PCM_STATE_RUNNING:
snd_pcm_mmap_commit (pcm, offset, nframes);
break;
default:
break;
}
}
void
SNDDMA_BlockSound (void)
{
if (++snd_blocked == 1)
snd_pcm_pause (pcm, 1);
}
void
SNDDMA_UnblockSound (void)
{
if (!snd_blocked)
return;
if (!--snd_blocked)
snd_pcm_pause (pcm, 0);
}
plugin_t *
PluginInfo (void)
{
plugin_info.type = qfp_snd_output;
plugin_info.api_version = QFPLUGIN_VERSION;
plugin_info.plugin_version = "0.1";
plugin_info.description = "ALSA 0.9.x digital output";
plugin_info.copyright = "Copyright (C) 1996-1997 id Software, Inc.\n"
"Copyright (C) 1999,2000,2001 contributors of the QuakeForge"
" project\n"
"Please see the file \"AUTHORS\" for a list of contributors";
plugin_info.functions = &plugin_info_funcs;
plugin_info.data = &plugin_info_data;
plugin_info_data.general = &plugin_info_general_data;
plugin_info_data.input = NULL;
plugin_info_data.snd_output = &plugin_info_snd_output_data;
plugin_info_funcs.general = &plugin_info_general_funcs;
plugin_info_funcs.input = NULL;
plugin_info_funcs.snd_output = &plugin_info_snd_output_funcs;
plugin_info_general_funcs.p_Init = SNDDMA_Init_Cvars;
plugin_info_general_funcs.p_Shutdown = NULL;
plugin_info_snd_output_funcs.pS_O_Init = SNDDMA_Init;
plugin_info_snd_output_funcs.pS_O_Shutdown = SNDDMA_Shutdown;
plugin_info_snd_output_funcs.pS_O_GetDMAPos = SNDDMA_GetDMAPos;
plugin_info_snd_output_funcs.pS_O_Submit = SNDDMA_Submit;
plugin_info_snd_output_funcs.pS_O_BlockSound = SNDDMA_BlockSound;
plugin_info_snd_output_funcs.pS_O_UnblockSound = SNDDMA_UnblockSound;
return &plugin_info;
}
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