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/* MikMod sound library
(c) 1998, 1999, 2000 Miodrag Vallat and others - see file AUTHORS for
complete list.
This library is free software; you can redistribute it and/or modify
it under the terms of the GNU Library 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 Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.
*/
/*==============================================================================
$Id$
Driver for Advanced Linux Sound Architecture (ALSA)
==============================================================================*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "mikmod_internals.h"
#ifdef DRV_ALSA
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_MEMORY_H
#include <memory.h>
#endif
#ifdef MIKMOD_DYNAMIC
#include <dlfcn.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <alsa/asoundlib.h>
#if defined(SND_LIB_VERSION) && (SND_LIB_VERSION >= 0x20000)
#undef DRV_ALSA
#endif
#if defined(SND_LIB_VERSION) && (SND_LIB_VERSION < 0x600)
#error ALSA Version too old. Please upgrade your Linux distribution.
#endif
#endif /* DRV_ALSA */
#ifdef DRV_ALSA
#ifdef MIKMOD_DYNAMIC
/* runtime link with libasound */
#ifndef HAVE_RTLD_GLOBAL
#define RTLD_GLOBAL (0)
#endif
static int (*alsa_pcm_subformat_mask_malloc)(snd_pcm_subformat_mask_t **);
static const char * (*alsa_strerror)(int);
static int (*alsa_pcm_resume)(snd_pcm_t *);
static int (*alsa_pcm_prepare)(snd_pcm_t *);
static int (*alsa_pcm_hw_params_any)(snd_pcm_t *, snd_pcm_hw_params_t *);
static int (*alsa_pcm_hw_params)(snd_pcm_t *, snd_pcm_hw_params_t *);
static int (*alsa_pcm_hw_params_current)(snd_pcm_t *, snd_pcm_hw_params_t *);
static int (*alsa_pcm_hw_params_set_access)(snd_pcm_t *, snd_pcm_hw_params_t *, snd_pcm_access_t);
static int (*alsa_pcm_hw_params_set_format)(snd_pcm_t *, snd_pcm_hw_params_t *, snd_pcm_format_t);
static int (*alsa_pcm_hw_params_set_rate_near)(snd_pcm_t *, snd_pcm_hw_params_t *, unsigned int *, int *);
static int (*alsa_pcm_hw_params_set_channels_near)(snd_pcm_t *, snd_pcm_hw_params_t *, unsigned int *);
static int (*alsa_pcm_hw_params_set_buffer_time_near)(snd_pcm_t *, snd_pcm_hw_params_t *, unsigned int *, int *);
static int (*alsa_pcm_hw_params_set_period_time_near)(snd_pcm_t *, snd_pcm_hw_params_t *, unsigned int *, int *);
static int (*alsa_pcm_hw_params_get_buffer_size)(const snd_pcm_hw_params_t *, snd_pcm_uframes_t *);
static int (*alsa_pcm_hw_params_get_period_size)(const snd_pcm_hw_params_t *, snd_pcm_uframes_t *, int *);
static int (*alsa_pcm_sw_params_sizeof)(void);
static int (*alsa_pcm_hw_params_sizeof)(void);
static int (*alsa_pcm_open)(snd_pcm_t**, const char *, int, int);
static int (*alsa_pcm_close)(snd_pcm_t*);
static int (*alsa_pcm_drain)(snd_pcm_t*);
static int (*alsa_pcm_drop)(snd_pcm_t*);
static int (*alsa_pcm_start)(snd_pcm_t *);
static snd_pcm_sframes_t (*alsa_pcm_writei)(snd_pcm_t*,const void*,snd_pcm_uframes_t);
static void* libasound = NULL;
#else
/* compile-time link with libasound */
#define alsa_pcm_subformat_mask_malloc snd_pcm_subformat_mask_malloc
#define alsa_strerror snd_strerror
#define alsa_pcm_hw_params_any snd_pcm_hw_params_any
#define alsa_pcm_hw_params snd_pcm_hw_params
#define alsa_pcm_hw_params_current snd_pcm_hw_params_current
#define alsa_pcm_hw_params_set_access snd_pcm_hw_params_set_access
#define alsa_pcm_hw_params_set_format snd_pcm_hw_params_set_format
#define alsa_pcm_hw_params_set_rate_near snd_pcm_hw_params_set_rate_near
#define alsa_pcm_hw_params_set_channels_near snd_pcm_hw_params_set_channels_near
#define alsa_pcm_hw_params_set_buffer_time_near snd_pcm_hw_params_set_buffer_time_near
#define alsa_pcm_hw_params_set_period_time_near snd_pcm_hw_params_set_period_time_near
#define alsa_pcm_hw_params_get_buffer_size snd_pcm_hw_params_get_buffer_size
#define alsa_pcm_hw_params_get_period_size snd_pcm_hw_params_get_period_size
#define alsa_pcm_resume snd_pcm_resume
#define alsa_pcm_prepare snd_pcm_prepare
#define alsa_pcm_close snd_pcm_close
#define alsa_pcm_drain snd_pcm_drain
#define alsa_pcm_drop snd_pcm_drop
#define alsa_pcm_start snd_pcm_start
#define alsa_pcm_open snd_pcm_open
#define alsa_pcm_writei snd_pcm_writei
#endif /* MIKMOD_DYNAMIC */
#if defined(MIKMOD_DEBUG)
# define dbgprint fprintf
#elif defined (__GNUC__) && !(defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L)
# define dbgprint(f, fmt, args...) do {} while (0)
#else
# define dbgprint(f, ...) do {} while (0)
#endif
static BOOL enabled = 0;
static snd_pcm_t *pcm_h = NULL;
static SBYTE *audiobuffer = NULL;
static snd_pcm_sframes_t period_size;
static int bytes_written = 0, bytes_played = 0;
static int global_frame_size;
#ifdef MIKMOD_DYNAMIC
static int ALSA_Link(void)
{
if (libasound) return 0;
/* load libasound.so */
libasound = dlopen("libasound.so.2",RTLD_LAZY|RTLD_GLOBAL);
if (!libasound) libasound = dlopen("libasound.so",RTLD_LAZY|RTLD_GLOBAL);
if (!libasound) return 1;
if (!(alsa_pcm_subformat_mask_malloc = (int (*)(snd_pcm_subformat_mask_t **))
dlsym(libasound,"snd_pcm_subformat_mask_malloc"))) return 1;
if (!(alsa_strerror = (const char* (*)(int))
dlsym(libasound,"snd_strerror"))) return 1;
if (!(alsa_pcm_prepare = (int (*)(snd_pcm_t *))
dlsym(libasound,"snd_pcm_prepare"))) return 1;
if (!(alsa_pcm_sw_params_sizeof = (int (*)(void))
dlsym(libasound,"snd_pcm_sw_params_sizeof"))) return 1;
if (!(alsa_pcm_hw_params_sizeof = (int (*)(void))
dlsym(libasound,"snd_pcm_hw_params_sizeof"))) return 1;
if (!(alsa_pcm_resume = (int (*)(snd_pcm_t *))
dlsym(libasound,"snd_pcm_resume"))) return 1;
if (!(alsa_pcm_hw_params_any = (int (*)(snd_pcm_t *, snd_pcm_hw_params_t *))
dlsym(libasound,"snd_pcm_hw_params_any"))) return 1;
if (!(alsa_pcm_hw_params = (int (*)(snd_pcm_t *, snd_pcm_hw_params_t *))
dlsym(libasound,"snd_pcm_hw_params"))) return 1;
if (!(alsa_pcm_hw_params_current = (int (*)(snd_pcm_t *, snd_pcm_hw_params_t *))
dlsym(libasound,"snd_pcm_hw_params_current"))) return 1;
if (!(alsa_pcm_hw_params_set_access = (int (*)(snd_pcm_t *, snd_pcm_hw_params_t *, snd_pcm_access_t))
dlsym(libasound,"snd_pcm_hw_params_set_access"))) return 1;
if (!(alsa_pcm_hw_params_set_format = (int (*)(snd_pcm_t *, snd_pcm_hw_params_t *, snd_pcm_format_t))
dlsym(libasound,"snd_pcm_hw_params_set_format"))) return 1;
if (!(alsa_pcm_hw_params_set_rate_near = (int (*)(snd_pcm_t *, snd_pcm_hw_params_t *, unsigned int *, int *))
dlsym(libasound,"snd_pcm_hw_params_set_rate_near"))) return 1;
if (!(alsa_pcm_hw_params_set_channels_near = (int (*)(snd_pcm_t *, snd_pcm_hw_params_t *, unsigned int *))
dlsym(libasound,"snd_pcm_hw_params_set_channels_near"))) return 1;
if (!(alsa_pcm_hw_params_set_buffer_time_near = (int (*)(snd_pcm_t *, snd_pcm_hw_params_t *, unsigned int *, int *))
dlsym(libasound,"snd_pcm_hw_params_set_buffer_time_near"))) return 1;
if (!(alsa_pcm_hw_params_set_period_time_near = (int (*)(snd_pcm_t *, snd_pcm_hw_params_t *, unsigned int *, int *))
dlsym(libasound,"snd_pcm_hw_params_set_period_time_near"))) return 1;
if (!(alsa_pcm_hw_params_get_buffer_size = (int (*)(const snd_pcm_hw_params_t *, snd_pcm_uframes_t *))
dlsym(libasound,"snd_pcm_hw_params_get_buffer_size"))) return 1;
if (!(alsa_pcm_hw_params_get_period_size = (int (*)(const snd_pcm_hw_params_t *, snd_pcm_uframes_t *, int *))
dlsym(libasound,"snd_pcm_hw_params_get_period_size"))) return 1;
if (!(alsa_pcm_open = (int (*)(snd_pcm_t**, const char *, int, int))
dlsym(libasound,"snd_pcm_open"))) return 1;
if (!(alsa_pcm_close = (int (*)(snd_pcm_t*))
dlsym(libasound,"snd_pcm_close"))) return 1;
if (!(alsa_pcm_drain = (int (*)(snd_pcm_t*))
dlsym(libasound,"snd_pcm_drain"))) return 1;
if (!(alsa_pcm_drop = (int (*)(snd_pcm_t*))
dlsym(libasound,"snd_pcm_drop"))) return 1;
if (!(alsa_pcm_start = (int (*)(snd_pcm_t *))
dlsym(libasound,"snd_pcm_start"))) return 1;
if (!(alsa_pcm_writei = (snd_pcm_sframes_t (*)(snd_pcm_t*,const void*,snd_pcm_uframes_t))
dlsym(libasound,"snd_pcm_writei"))) return 1;
return 0;
}
static void ALSA_Unlink(void)
{
alsa_pcm_subformat_mask_malloc = NULL;
alsa_strerror = NULL;
alsa_pcm_resume = NULL;
alsa_pcm_prepare = NULL;
alsa_pcm_hw_params_any = NULL;
alsa_pcm_hw_params = NULL;
alsa_pcm_hw_params_current = NULL;
alsa_pcm_hw_params_set_access = NULL;
alsa_pcm_hw_params_set_format = NULL;
alsa_pcm_hw_params_set_rate_near = NULL;
alsa_pcm_hw_params_set_channels_near = NULL;
alsa_pcm_hw_params_set_buffer_time_near = NULL;
alsa_pcm_hw_params_set_period_time_near = NULL;
alsa_pcm_hw_params_get_buffer_size = NULL;
alsa_pcm_hw_params_get_period_size = NULL;
alsa_pcm_close = NULL;
alsa_pcm_drain = NULL;
alsa_pcm_drop = NULL;
alsa_pcm_start = NULL;
alsa_pcm_open = NULL;
alsa_pcm_writei = NULL;
if (libasound) {
dlclose(libasound);
libasound = NULL;
}
}
/* This is done to override the identifiers expanded
* in the macros provided by the ALSA includes which are
* not available.
* */
#define snd_strerror alsa_strerror
#define snd_pcm_sw_params_sizeof alsa_pcm_sw_params_sizeof
#define snd_pcm_hw_params_sizeof alsa_pcm_hw_params_sizeof
#endif /* MIKMOD_DYNAMIC */
static void ALSA_CommandLine(const CHAR *cmdline)
{
/* no options */
}
static BOOL ALSA_IsThere(void)
{
snd_pcm_subformat_mask_t *ptr = NULL;
BOOL retval;
#ifdef MIKMOD_DYNAMIC
if (ALSA_Link()) return 0;
#endif
retval = (alsa_pcm_subformat_mask_malloc(&ptr) == 0) && (ptr != NULL);
free(ptr);
#ifdef MIKMOD_DYNAMIC
ALSA_Unlink();
#endif
return retval;
}
static int ALSA_Init_internal(void)
{
snd_pcm_format_t pformat;
unsigned int btime = 250000; /* 250ms */
unsigned int ptime = 50000; /* 50ms */
snd_pcm_uframes_t psize;
snd_pcm_uframes_t bsize;
unsigned int rate, channels;
snd_pcm_hw_params_t * hwparams;
int err;
/* setup playback format structure */
pformat = (md_mode&DMODE_FLOAT)? SND_PCM_FORMAT_FLOAT :
(md_mode&DMODE_16BITS)? SND_PCM_FORMAT_S16 : SND_PCM_FORMAT_U8;
channels = (md_mode&DMODE_STEREO)?2:1;
rate = md_mixfreq;
#define MIKMOD_ALSA_DEVICE "default"
if ((err = alsa_pcm_open(&pcm_h, MIKMOD_ALSA_DEVICE, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK)) < 0) {
_mm_errno = MMERR_OPENING_AUDIO;
goto END;
}
snd_pcm_hw_params_alloca(&hwparams);
err = alsa_pcm_hw_params_any(pcm_h, hwparams);
if (err < 0) {
_mm_errno = MMERR_ALSA_NOCONFIG;
goto END;
}
err = alsa_pcm_hw_params_set_access(pcm_h, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED);
if (!err) err = alsa_pcm_hw_params_set_format(pcm_h, hwparams, pformat);
if (!err) err = alsa_pcm_hw_params_set_rate_near(pcm_h, hwparams, &rate, NULL);
if (!err) err = alsa_pcm_hw_params_set_channels_near(pcm_h, hwparams, &channels);
if (!err) err = alsa_pcm_hw_params_set_buffer_time_near(pcm_h, hwparams, &btime, NULL);
if (!err) err = alsa_pcm_hw_params_set_period_time_near(pcm_h, hwparams, &ptime, NULL);
if (!err) err = alsa_pcm_hw_params(pcm_h, hwparams);
if (err < 0) {
_mm_errno = MMERR_ALSA_SETPARAMS;
goto END;
}
if (rate != md_mixfreq) {
_mm_errno = MMERR_ALSA_SETRATE;
goto END;
}
if (!(md_mode&DMODE_STEREO) && channels != 1) {
_mm_errno = MMERR_ALSA_SETCHANNELS;
goto END;
}
if ((md_mode&DMODE_STEREO) && channels != 2) {
_mm_errno = MMERR_ALSA_SETCHANNELS;
goto END;
}
err = alsa_pcm_hw_params_current(pcm_h, hwparams);
if (!err) err = alsa_pcm_hw_params_get_buffer_size(hwparams, &bsize);
if (!err) err = alsa_pcm_hw_params_get_period_size(hwparams, &psize, NULL);
if (err < 0) {
_mm_errno = MMERR_ALSA_BUFFERSIZE;
goto END;
}
period_size = psize;
global_frame_size = channels *
((md_mode&DMODE_FLOAT)? 4 : (md_mode&DMODE_16BITS)? 2 : 1);
if (!(audiobuffer=(SBYTE*)MikMod_malloc(period_size * global_frame_size))) {
_mm_errno = MMERR_OUT_OF_MEMORY;
goto END;
}
/* sound device is ready to work */
if (!VC_Init()) {
enabled = 1;
return 0;
}
END:
alsa_pcm_close(pcm_h);
pcm_h = NULL;
return 1;
}
static int ALSA_Init(void)
{
#ifdef HAVE_SSE2
/* TODO : Detect SSE2, then set md_mode |= DMODE_SIMDMIXER;*/
#endif
#ifdef MIKMOD_DYNAMIC
if (ALSA_Link()) {
_mm_errno=MMERR_DYNAMIC_LINKING;
return 1;
}
#endif
return ALSA_Init_internal();
}
static void ALSA_Exit_internal(void)
{
enabled = 0;
VC_Exit();
if (pcm_h) {
alsa_pcm_drain(pcm_h);
alsa_pcm_close(pcm_h);
pcm_h = NULL;
}
MikMod_free(audiobuffer);
audiobuffer = NULL;
}
static void ALSA_Exit(void)
{
ALSA_Exit_internal();
#ifdef MIKMOD_DYNAMIC
ALSA_Unlink();
#endif
}
/* Underrun and suspend recovery - from alsa-lib:test/pcm.c
*/
static int xrun_recovery(snd_pcm_t *handle, int err)
{
if (err == -EPIPE) { /* under-run */
err = alsa_pcm_prepare(handle);
if (err < 0)
dbgprint(stderr, "Can't recover from underrun, prepare failed: %s\n", snd_strerror(err));
return 0;
}
else if (err == -ESTRPIPE) {
while ((err = alsa_pcm_resume(handle)) == -EAGAIN)
sleep(1); /* wait until the suspend flag is released */
if (err < 0) {
err = alsa_pcm_prepare(handle);
if (err < 0)
dbgprint(stderr, "Can't recover from suspend, prepare failed: %s\n", snd_strerror(err));
}
return 0;
}
return err;
}
static void ALSA_Update(void)
{
int err;
if (!enabled) return;
if (bytes_written == 0 || bytes_played == bytes_written) {
bytes_written = VC_WriteBytes(audiobuffer,period_size * global_frame_size);
bytes_played = 0;
}
while (bytes_played < bytes_written)
{
err = alsa_pcm_writei(pcm_h, &audiobuffer[bytes_played], (bytes_written - bytes_played) / global_frame_size);
if (err == -EAGAIN)
continue;
if (err < 0) {
if ((err = xrun_recovery(pcm_h, err)) < 0) {
_mm_errno = MMERR_ALSA_PCM_RECOVER;
enabled = 0;
dbgprint(stderr, "Write error: %s\n", alsa_strerror(err));
}
break;
}
bytes_played += err * global_frame_size;
}
}
static int ALSA_PlayStart(void)
{
int err;
if (pcm_h == NULL) return 1;
err = alsa_pcm_prepare(pcm_h);
if (err == 0)
err = alsa_pcm_start(pcm_h);
if (err < 0) {
enabled = 0;
_mm_errno = MMERR_ALSA_PCM_START;
return 1;
}
return VC_PlayStart();
}
static void ALSA_PlayStop(void)
{
VC_PlayStop();
if (pcm_h) alsa_pcm_drop(pcm_h);
}
static int ALSA_Reset(void)
{
ALSA_Exit_internal();
return ALSA_Init_internal();
}
MIKMODAPI MDRIVER drv_alsa = {
NULL,
"ALSA",
"Advanced Linux Sound Architecture (ALSA) driver v1.11",
0,255,
"alsa",
NULL,
ALSA_CommandLine,
ALSA_IsThere,
VC_SampleLoad,
VC_SampleUnload,
VC_SampleSpace,
VC_SampleLength,
ALSA_Init,
ALSA_Exit,
ALSA_Reset,
VC_SetNumVoices,
ALSA_PlayStart,
ALSA_PlayStop,
ALSA_Update,
NULL,
VC_VoiceSetVolume,
VC_VoiceGetVolume,
VC_VoiceSetFrequency,
VC_VoiceGetFrequency,
VC_VoiceSetPanning,
VC_VoiceGetPanning,
VC_VoicePlay,
VC_VoiceStop,
VC_VoiceStopped,
VC_VoiceGetPosition,
VC_VoiceRealVolume
};
#else
MISSING(drv_alsa);
#endif
/* ex:set ts=8: */
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