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Commit e146cd9a authored by Sam Lantinga's avatar Sam Lantinga
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Updated the QNX audio code for QNX 6.2 (thanks Travis!) 

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extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%40419
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src/audio/nto/SDL_nto_audio.c
View file @ e146cd9a
Date: Sun, 16 Jun 2002 00:59:13 -0300
From: Travis <smallfri@bigfoot.com>
To: slouken@libsdl.org
Subject: NTO Audio Fixes
/* /*
SDL - Simple DirectMedia Layer SDL - Simple DirectMedia Layer
Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
...@@ -20,10 +25,6 @@ ...@@ -20,10 +25,6 @@
slouken@libsdl.org slouken@libsdl.org
*/ */
/* Allow access to a raw mixing buffer */
#include <stdlib.h> #include <stdlib.h>
#include <stdio.h> #include <stdio.h>
#include <string.h> #include <string.h>
...@@ -35,6 +36,7 @@ ...@@ -35,6 +36,7 @@
#include <sys/time.h> #include <sys/time.h>
#include <sched.h> #include <sched.h>
#include <sys/asoundlib.h> #include <sys/asoundlib.h>
#include <sys/select.h>
#include "SDL_audio.h" #include "SDL_audio.h"
#include "SDL_error.h" #include "SDL_error.h"
...@@ -46,19 +48,15 @@ ...@@ -46,19 +48,15 @@
/* The tag name used by NTO audio */ /* The tag name used by NTO audio */
#define DRIVER_NAME "nto" #define DRIVER_NAME "nto"
/* default card and device numbers as listed in dev/snd */
static int card_no = 0;
static int device_no = 0;
/* default channel communication parameters */ /* default channel communication parameters */
#define DEFAULT_CPARAMS_RATE 22050 #define DEFAULT_CPARAMS_RATE 22050
#define DEFAULT_CPARAMS_VOICES 1 #define DEFAULT_CPARAMS_VOICES 1
#define DEFAULT_CPARAMS_FRAG_SIZE 4096 //was 512 #define DEFAULT_CPARAMS_FRAG_SIZE 4096
#define DEFAULT_CPARAMS_FRAGS_MIN 1 #define DEFAULT_CPARAMS_FRAGS_MIN 1
#define DEFAULT_CPARAMS_FRAGS_MAX 1 #define DEFAULT_CPARAMS_FRAGS_MAX 1
/* Open the audio device for playback, and don't block if busy */ /* Open the audio device for playback, and don't block if busy */
#define OPEN_FLAGS SND_PCM_OPEN_PLAYBACK #define OPEN_FLAGS SND_PCM_OPEN_PLAYBACK
/* Audio driver functions */ /* Audio driver functions */
static int NTO_OpenAudio(_THIS, SDL_AudioSpec *spec); static int NTO_OpenAudio(_THIS, SDL_AudioSpec *spec);
...@@ -68,8 +66,8 @@ static Uint8 *NTO_GetAudioBuf(_THIS); ...@@ -68,8 +66,8 @@ static Uint8 *NTO_GetAudioBuf(_THIS);
static void NTO_CloseAudio(_THIS); static void NTO_CloseAudio(_THIS);
static snd_pcm_channel_status_t cstatus; static snd_pcm_channel_status_t cstatus;
static snd_pcm_channel_params_t cparams; static snd_pcm_channel_params_t cparams;
static snd_pcm_channel_setup_t csetup; static snd_pcm_channel_setup_t csetup;
/* PCM transfer channel parameters initialize function */ /* PCM transfer channel parameters initialize function */
static void init_pcm_cparams(snd_pcm_channel_params_t* cparams) static void init_pcm_cparams(snd_pcm_channel_params_t* cparams)
...@@ -78,7 +76,7 @@ static void init_pcm_cparams(snd_pcm_channel_params_t* cparams) ...@@ -78,7 +76,7 @@ static void init_pcm_cparams(snd_pcm_channel_params_t* cparams)
cparams->channel = SND_PCM_CHANNEL_PLAYBACK; cparams->channel = SND_PCM_CHANNEL_PLAYBACK;
cparams->mode = SND_PCM_MODE_BLOCK; cparams->mode = SND_PCM_MODE_BLOCK;
cparams->start_mode = SND_PCM_START_DATA; //_FULL cparams->start_mode = SND_PCM_START_DATA;
cparams->stop_mode = SND_PCM_STOP_STOP; cparams->stop_mode = SND_PCM_STOP_STOP;
cparams->format.format = SND_PCM_SFMT_S16_LE; cparams->format.format = SND_PCM_SFMT_S16_LE;
cparams->format.interleave = 1; cparams->format.interleave = 1;
...@@ -89,54 +87,48 @@ static void init_pcm_cparams(snd_pcm_channel_params_t* cparams) ...@@ -89,54 +87,48 @@ static void init_pcm_cparams(snd_pcm_channel_params_t* cparams)
cparams->buf.block.frags_max = DEFAULT_CPARAMS_FRAGS_MAX; cparams->buf.block.frags_max = DEFAULT_CPARAMS_FRAGS_MAX;
} }
/* Audio driver bootstrap functions */
static int Audio_Available(void) static int Audio_Available(void)
/*
See if we can open a nonblocking channel.
Return value '1' means we can.
Return value '0' means we cannot.
*/
{ {
/*
See if we can open a nonblocking channel.
Return value '1' means we can.
Return value '0' means we cannot.
*/
int available; int available;
int rval; int rval;
snd_pcm_t *handle; snd_pcm_t *handle;
available = 0; available = 0;
handle = NULL; handle = NULL;
//JB modified to take advantage of software mixer
rval = snd_pcm_open_preferred(&handle, &card_no, &device_no, OPEN_FLAGS);
if (rval >= 0) rval = snd_pcm_open_preferred(&handle, NULL, NULL, OPEN_FLAGS);
{
available = 1;
if ((rval = snd_pcm_close(handle)) < 0) if (rval >= 0){
{ available = 1;
SDL_SetError("snd_pcm_close failed: %s\n",snd_strerror(rval));
if ((rval = snd_pcm_close(handle)) < 0){
SDL_SetError("snd_pcm_close failed: %s\n",snd_strerror(rval));
available = 0; available = 0;
} }
} }
else else{
{ SDL_SetError("snd_pcm_open failed: %s\n", snd_strerror(rval));
SDL_SetError("snd_pcm_open failed: %s\n", snd_strerror(rval));
} }
#ifdef DEBUG_AUDIO #ifdef DEBUG_AUDIO
fprintf(stderr,"AudioAvailable rtns %d\n", available); fprintf(stderr,"AudioAvailable rtns %d\n", available);
#endif #endif
return(available); return(available);
} }
static void Audio_DeleteDevice(SDL_AudioDevice *device) static void Audio_DeleteDevice(SDL_AudioDevice *device)
{ {
#ifdef DEBUG_AUDIO #ifdef DEBUG_AUDIO
fprintf(stderr,"Audio_DeleteDevice\n"); fprintf(stderr,"Audio_DeleteDevice\n");
#endif #endif
free(device->hidden); free(device->hidden);
free(device); free(device);
} }
...@@ -144,15 +136,15 @@ static void Audio_DeleteDevice(SDL_AudioDevice *device) ...@@ -144,15 +136,15 @@ static void Audio_DeleteDevice(SDL_AudioDevice *device)
static SDL_AudioDevice *Audio_CreateDevice(int devindex) static SDL_AudioDevice *Audio_CreateDevice(int devindex)
{ {
SDL_AudioDevice *this; SDL_AudioDevice *this;
#ifdef DEBUG_AUDIO #ifdef DEBUG_AUDIO
fprintf(stderr,"Audio_CreateDevice\n"); fprintf(stderr,"Audio_CreateDevice\n");
#endif #endif
/* Initialize all variables that we clean on shutdown */ /* Initialize all variables that we clean on shutdown */
this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
if ( this ) { if ( this ) {
memset(this, 0, (sizeof *this)); memset(this, 0, (sizeof *this));
this->hidden = (struct SDL_PrivateAudioData *) this->hidden = (struct SDL_PrivateAudioData *)
malloc((sizeof *this->hidden)); malloc((sizeof *this->hidden));
} }
if ( (this == NULL) || (this->hidden == NULL) ) { if ( (this == NULL) || (this->hidden == NULL) ) {
SDL_OutOfMemory(); SDL_OutOfMemory();
...@@ -185,117 +177,92 @@ AudioBootStrap ALSA_bootstrap = { ...@@ -185,117 +177,92 @@ AudioBootStrap ALSA_bootstrap = {
/* This function waits until it is possible to write a full sound buffer */ /* This function waits until it is possible to write a full sound buffer */
static void NTO_WaitAudio(_THIS) static void NTO_WaitAudio(_THIS)
{ {
int rval; fd_set wfds;
int totalbytes,roomavail;
/*we consider a full sound buffer to be of size pcm_len bytes */
#ifdef DEBUG_AUDIO
fprintf(stderr,"NTO_WaitAudio\n");
#endif
while(1) FD_SET( audio_fd, &wfds );
switch( select( audio_fd + 1, NULL, &wfds, NULL, NULL ) )
{ {
memset(&cstatus, 0, sizeof(cstatus)); case -1:
if( (rval = snd_pcm_plugin_status(audio_handle, &cstatus)) < 0 ) case 0:
{ /* Error */
SDL_SetError("snd_pcm_plugin_status failed: %s\n", snd_strerror(rval)); SDL_SetError("select() in NTO_WaitAudio failed: %s\n", strerror(errno));
return; break;
} default:
if(FD_ISSET(audio_fd, &wfds))
totalbytes = csetup.buf.block.frag_size *csetup.buf.block.frags; return;
roomavail = totalbytes - cstatus.count; }
#ifdef DEBUG_AUDIO
fprintf(stderr,"NTO_WaitAudio roomavail %d pcm_len %d\n",roomavail,pcm_len);
#endif
if ((roomavail >= pcm_len) || (roomavail < 0))
return;
SDL_Delay(10);
}
} }
static void NTO_PlayAudio(_THIS) static void NTO_PlayAudio(_THIS)
{ {
int written, rval; int written, rval;
int towrite; int towrite;
#ifdef DEBUG_AUDIO #ifdef DEBUG_AUDIO
fprintf(stderr, "NTO_PlayAudio\n"); fprintf(stderr, "NTO_PlayAudio\n");
#endif #endif
if( !this->enabled) if( !this->enabled){
return; return;
}
towrite = pcm_len; towrite = pcm_len;
/* Write the audio data, checking for EAGAIN (buffer full) and underrun */
/* Write the audio data, checking for EAGAIN (buffer full) and underrun */ do {
do {
written = snd_pcm_plugin_write(audio_handle, pcm_buf, towrite); written = snd_pcm_plugin_write(audio_handle, pcm_buf, towrite);
#ifdef DEBUG_AUDIO #ifdef DEBUG_AUDIO
fprintf(stderr, "NTO_PlayAudio: written = %d towrite = %d\n",written,towrite); fprintf(stderr, "NTO_PlayAudio: written = %d towrite = %d\n",written,towrite);
#endif #endif
if (written != towrite) if (written != towrite){
{ if ((errno == EAGAIN) || (errno == EWOULDBLOCK)){
if ((errno == EAGAIN) || (errno == EWOULDBLOCK)) SDL_Delay(1); /* Let a little CPU time go by and try to write again */
{ #ifdef DEBUG_AUDIO
SDL_Delay(1); /* Let a little CPU time go by and try to write again */
#ifdef DEBUG_AUDIO
fprintf(stderr, "errno == EAGAIN written %d\n", written); fprintf(stderr, "errno == EAGAIN written %d\n", written);
#endif
towrite -= written; //we wrote some data towrite -= written; //we wrote some data
#endif
continue; continue;
} }
else if((errno == EINVAL) || (errno == EIO)) else if((errno == EINVAL) || (errno == EIO)){
{ if(errno == EIO){
#ifdef DEBUG_AUDIO #ifdef DEBUG_AUDIO
if(errno == EIO) fprintf(stderr,"snd_pcm_plugin_write failed EIO: %s\n", snd_strerror(written));
fprintf(stderr,"snd_pcm_plugin_write failed EIO: %s\n", snd_strerror(written)); #endif
if(errno == EINVAL) }
fprintf(stderr,"snd_pcm_plugin_write failed EINVAL: %s\n", snd_strerror(written)); if(errno == EINVAL){
#ifdef DEBUG_AUDIO
#endif fprintf(stderr,"snd_pcm_plugin_write failed EINVAL: %s\n", snd_strerror(written));
#endif
memset(&cstatus, 0, sizeof(cstatus)); }
if( (rval = snd_pcm_plugin_status(audio_handle, &cstatus)) < 0 )
{ memset(&cstatus, 0, sizeof(cstatus));
#ifdef DEBUG_AUDIO if( (rval = snd_pcm_plugin_status(audio_handle, &cstatus)) < 0 ){
#ifdef DEBUG_AUDIO
fprintf(stderr, "snd_pcm_plugin_status failed %s\n",snd_strerror(rval)); fprintf(stderr, "snd_pcm_plugin_status failed %s\n",snd_strerror(rval));
#endif #endif
SDL_SetError("snd_pcm_plugin_status failed: %s\n", snd_strerror(rval)); SDL_SetError("snd_pcm_plugin_status failed: %s\n", snd_strerror(rval));
return; return;
} }
if ( (cstatus.status == SND_PCM_STATUS_UNDERRUN) || if ( (cstatus.status == SND_PCM_STATUS_UNDERRUN) || (cstatus.status == SND_PCM_STATUS_READY) ){
(cstatus.status == SND_PCM_STATUS_READY) ) #ifdef DEBUG_AUDIO
{
#ifdef DEBUG_AUDIO
fprintf(stderr, "buffer underrun\n"); fprintf(stderr, "buffer underrun\n");
#endif #endif
if ( (rval = snd_pcm_plugin_prepare (audio_handle,SND_PCM_CHANNEL_PLAYBACK)) < 0 ) if ( (rval = snd_pcm_plugin_prepare (audio_handle,SND_PCM_CHANNEL_PLAYBACK)) < 0 ){
{ #ifdef DEBUG_AUDIO
#ifdef DEBUG_AUDIO
fprintf(stderr, "NTO_PlayAudio: prepare failed %s\n",snd_strerror(rval)); fprintf(stderr, "NTO_PlayAudio: prepare failed %s\n",snd_strerror(rval));
#endif #endif
SDL_SetError("snd_pcm_plugin_prepare failed: %s\n",snd_strerror(rval) ); SDL_SetError("snd_pcm_plugin_prepare failed: %s\n",snd_strerror(rval) );
return; return;
} }
} }
continue; continue;
} }
else else{
{ #ifdef DEBUG_AUDIO
#ifdef DEBUG_AUDIO fprintf(stderr, "NTO_PlayAudio: snd_pcm_plugin_write failed unknown errno %d %s\n",errno, snd_strerror(rval));
fprintf(stderr, "NTO_PlayAudio: snd_pcm_plugin_write failed unknown errno %d %s\n",errno, snd_strerror(rval)); #endif
#endif
return; return;
} }
} }
...@@ -303,41 +270,39 @@ static void NTO_PlayAudio(_THIS) ...@@ -303,41 +270,39 @@ static void NTO_PlayAudio(_THIS)
{ {
towrite -= written; //we wrote all remaining data towrite -= written; //we wrote all remaining data
} }
} while ( (towrite > 0) && (this->enabled) ); } while ( (towrite > 0) && (this->enabled) );
/* If we couldn't write, assume fatal error for now */ /* If we couldn't write, assume fatal error for now */
if ( towrite != 0 ) { if ( towrite != 0 ) {
this->enabled = 0; this->enabled = 0;
} }
return; return;
} }
static Uint8 *NTO_GetAudioBuf(_THIS) static Uint8 *NTO_GetAudioBuf(_THIS)
{ {
#ifdef DEBUG_AUDIO #ifdef DEBUG_AUDIO
fprintf(stderr, "NTO_GetAudioBuf: pcm_buf %X\n",(Uint8 *)pcm_buf); fprintf(stderr, "NTO_GetAudioBuf: pcm_buf %X\n",(Uint8 *)pcm_buf);
#endif #endif
return(pcm_buf); return(pcm_buf);
} }
static void NTO_CloseAudio(_THIS) static void NTO_CloseAudio(_THIS)
{ {
int rval; int rval;
#ifdef DEBUG_AUDIO
fprintf(stderr, "NTO_CloseAudio\n");
#endif
this->enabled = 0; #ifdef DEBUG_AUDIO
fprintf(stderr, "NTO_CloseAudio\n");
#endif
this->enabled = 0;
if ( audio_handle != NULL ) { if ( audio_handle != NULL ) {
if ((rval = snd_pcm_plugin_flush(audio_handle,SND_PCM_CHANNEL_PLAYBACK)) < 0) if ((rval = snd_pcm_plugin_flush(audio_handle,SND_PCM_CHANNEL_PLAYBACK)) < 0){
{ SDL_SetError("snd_pcm_plugin_flush failed: %s\n",snd_strerror(rval));
SDL_SetError("snd_pcm_plugin_flush failed: %s\n",snd_strerror(rval));
return; return;
} }
if ((rval = snd_pcm_close(audio_handle)) < 0) if ((rval = snd_pcm_close(audio_handle)) < 0){
{
SDL_SetError("snd_pcm_close failed: %s\n",snd_strerror(rval)); SDL_SetError("snd_pcm_close failed: %s\n",snd_strerror(rval));
return; return;
} }
...@@ -353,12 +318,12 @@ static int NTO_OpenAudio(_THIS, SDL_AudioSpec *spec) ...@@ -353,12 +318,12 @@ static int NTO_OpenAudio(_THIS, SDL_AudioSpec *spec)
int twidth; int twidth;
int found; int found;
#ifdef DEBUG_AUDIO #ifdef DEBUG_AUDIO
fprintf(stderr, "NTO_OpenAudio\n"); fprintf(stderr, "NTO_OpenAudio\n");
#endif #endif
audio_handle = NULL; audio_handle = NULL;
this->enabled = 0; this->enabled = 0;
if ( pcm_buf != NULL ) { if ( pcm_buf != NULL ) {
free((Uint8 *)pcm_buf); free((Uint8 *)pcm_buf);
...@@ -369,67 +334,51 @@ static int NTO_OpenAudio(_THIS, SDL_AudioSpec *spec) ...@@ -369,67 +334,51 @@ static int NTO_OpenAudio(_THIS, SDL_AudioSpec *spec)
init_pcm_cparams(&cparams); init_pcm_cparams(&cparams);
/* Open the audio device */ /* Open the audio device */
rval = snd_pcm_open_preferred(&audio_handle, NULL, NULL, OPEN_FLAGS);
rval = snd_pcm_open_preferred(&audio_handle, &card_no, &device_no, OPEN_FLAGS);
if ( rval < 0 ) { if ( rval < 0 ) {
SDL_SetError("snd_pcm_open failed: %s\n", snd_strerror(rval)); SDL_SetError("snd_pcm_open failed: %s\n", snd_strerror(rval));
return(-1); return(-1);
} }
/* set to nonblocking mode */ /* enable count status parameter */
if ((rval = snd_pcm_nonblock_mode(audio_handle, 1))<0) //I assume 1 means on if ((rval = snd_pcm_plugin_set_disable(audio_handle, PLUGIN_DISABLE_MMAP))<0){
{ SDL_SetError("snd_pcm_plugin_set_disable failed: %s\n", snd_strerror(rval));
SDL_SetError("snd_pcm_nonblock_mode failed: %s\n", snd_strerror(rval)); return(-1);
return(-1); }
}
/* enable count status parameter */
if ((rval = snd_pcm_plugin_set_disable(audio_handle, PLUGIN_DISABLE_MMAP))<0)
{
SDL_SetError("snd_pcm_plugin_set_disable failed: %s\n", snd_strerror(rval));
return(-1);
}
/* Try for a closest match on audio format */ /* Try for a closest match on audio format */
format = 0; format = 0;
found = 0; // can't use format as SND_PCM_SFMT_U8 = 0 in nto found = 0; /* can't use format as SND_PCM_SFMT_U8 = 0 in nto */
for ( test_format = SDL_FirstAudioFormat(spec->format); !found ; ) for ( test_format = SDL_FirstAudioFormat(spec->format); !found ; )
{ {
#ifdef DEBUG_AUDIO #ifdef DEBUG_AUDIO
fprintf(stderr, "Trying format 0x%4.4x spec->samples %d\n", test_format,spec->samples); fprintf(stderr, "Trying format 0x%4.4x spec->samples %d\n", test_format,spec->samples);
#endif #endif
/* if match found set format to equivalent ALSA format */
switch ( test_format ) { /* if match found set format to equivalent ALSA format */
switch ( test_format ) {
case AUDIO_U8: case AUDIO_U8:
format = SND_PCM_SFMT_U8; format = SND_PCM_SFMT_U8;
cparams.buf.block.frag_size = spec->samples * spec->channels;
found = 1; found = 1;
break; break;
case AUDIO_S8: case AUDIO_S8:
format = SND_PCM_SFMT_S8; format = SND_PCM_SFMT_S8;
cparams.buf.block.frag_size = spec->samples * spec->channels;
found = 1; found = 1;
break; break;
case AUDIO_S16LSB: case AUDIO_S16LSB:
format = SND_PCM_SFMT_S16_LE; format = SND_PCM_SFMT_S16_LE;
cparams.buf.block.frag_size = spec->samples*2 * spec->channels;
found = 1; found = 1;
break; break;
case AUDIO_S16MSB: case AUDIO_S16MSB:
format = SND_PCM_SFMT_S16_BE; format = SND_PCM_SFMT_S16_BE;
cparams.buf.block.frag_size = spec->samples*2 * spec->channels;
found = 1; found = 1;
break; break;
case AUDIO_U16LSB: case AUDIO_U16LSB:
format = SND_PCM_SFMT_U16_LE; format = SND_PCM_SFMT_U16_LE;
cparams.buf.block.frag_size = spec->samples*2 * spec->channels;
found = 1; found = 1;
break; break;
case AUDIO_U16MSB: case AUDIO_U16MSB:
format = SND_PCM_SFMT_U16_BE; format = SND_PCM_SFMT_U16_BE;
cparams.buf.block.frag_size = spec->samples*2 * spec->channels;
found = 1; found = 1;
break; break;
default: default:
...@@ -439,13 +388,13 @@ static int NTO_OpenAudio(_THIS, SDL_AudioSpec *spec) ...@@ -439,13 +388,13 @@ static int NTO_OpenAudio(_THIS, SDL_AudioSpec *spec)
test_format = SDL_NextAudioFormat(); test_format = SDL_NextAudioFormat();
} }
} }
/* assumes test_format not 0 on success */ /* assumes test_format not 0 on success */
if ( test_format == 0 ) { if ( test_format == 0 ) {
SDL_SetError("Couldn't find any hardware audio formats"); SDL_SetError("Couldn't find any hardware audio formats");
return(-1); return(-1);
} }
spec->format = test_format; spec->format = test_format;
/* Set the audio format */ /* Set the audio format */
...@@ -454,11 +403,10 @@ static int NTO_OpenAudio(_THIS, SDL_AudioSpec *spec) ...@@ -454,11 +403,10 @@ static int NTO_OpenAudio(_THIS, SDL_AudioSpec *spec)
/* Set mono or stereo audio (currently only two channels supported) */ /* Set mono or stereo audio (currently only two channels supported) */
cparams.format.voices = spec->channels; cparams.format.voices = spec->channels;
#ifdef DEBUG_AUDIO #ifdef DEBUG_AUDIO
fprintf(stderr,"intializing channels %d\n", cparams.format.voices); fprintf(stderr,"intializing channels %d\n", cparams.format.voices);
#endif #endif
/* Set rate */ /* Set rate */
cparams.format.rate = spec->freq ; cparams.format.rate = spec->freq ;
...@@ -469,80 +417,77 @@ static int NTO_OpenAudio(_THIS, SDL_AudioSpec *spec) ...@@ -469,80 +417,77 @@ static int NTO_OpenAudio(_THIS, SDL_AudioSpec *spec)
return(-1); return(-1);
} }
/* Make sure channel is setup right one last time */ /* Make sure channel is setup right one last time */
memset( &csetup, 0, sizeof( csetup ) ); memset( &csetup, 0, sizeof( csetup ) );
csetup.channel = SND_PCM_CHANNEL_PLAYBACK; csetup.channel = SND_PCM_CHANNEL_PLAYBACK;
if ( snd_pcm_plugin_setup( audio_handle, &csetup ) < 0 ) if ( snd_pcm_plugin_setup( audio_handle, &csetup ) < 0 )
{ {
SDL_SetError("Unable to setup playback channel\n" ); SDL_SetError("Unable to setup playback channel\n" );
return(-1); return(-1);
} }
else else
{ {
#ifdef DEBUG_AUDIO #ifdef DEBUG_AUDIO
fprintf(stderr,"requested format: %d\n",cparams.format.format); fprintf(stderr,"requested format: %d\n",cparams.format.format);
fprintf(stderr,"requested frag size: %d\n",cparams.buf.block.frag_size); fprintf(stderr,"requested frag size: %d\n",cparams.buf.block.frag_size);
fprintf(stderr,"requested max frags: %d\n\n",cparams.buf.block.frags_max); fprintf(stderr,"requested max frags: %d\n\n",cparams.buf.block.frags_max);
fprintf(stderr,"real format: %d\n", csetup.format.format ); fprintf(stderr,"real format: %d\n", csetup.format.format );
fprintf(stderr,"real frag size : %d\n", csetup.buf.block.frag_size ); fprintf(stderr,"real frag size : %d\n", csetup.buf.block.frag_size );
fprintf(stderr,"real max frags : %d\n", csetup.buf.block.frags_max ); fprintf(stderr,"real max frags : %d\n", csetup.buf.block.frags_max );
#endif // DEBUG_AUDIO #endif
} }
/*
/* Allocate memory to the audio buffer and initialize with silence Allocate memory to the audio buffer and initialize with silence (Note that
(Note that buffer size must be a multiple of fragment size, so find closest multiple) buffer size must be a multiple of fragment size, so find closest multiple)
*/ */
twidth = snd_pcm_format_width(format); twidth = snd_pcm_format_width(format);
if (twidth < 0) { if (twidth < 0) {
printf("snd_pcm_format_width failed\n"); printf("snd_pcm_format_width failed\n");
twidth = 0; twidth = 0;
} }
#ifdef DEBUG_AUDIO #ifdef DEBUG_AUDIO
fprintf(stderr,"format is %d bits wide\n",twidth); fprintf(stderr,"format is %d bits wide\n",twidth);
#endif #endif
pcm_len = spec->size ; pcm_len = spec->size ;
#ifdef DEBUG_AUDIO
#ifdef DEBUG_AUDIO fprintf(stderr,"pcm_len set to %d\n", pcm_len);
fprintf(stderr,"pcm_len set to %d\n", pcm_len); #endif
#endif
if (pcm_len == 0){
if (pcm_len == 0) pcm_len = csetup.buf.block.frag_size;
{ }
pcm_len = csetup.buf.block.frag_size;
} pcm_buf = (Uint8*)malloc(pcm_len);
if (pcm_buf == NULL) {
pcm_buf = (Uint8*)malloc(pcm_len); SDL_SetError("pcm_buf malloc failed\n");
if (pcm_buf == NULL) { return(-1);
SDL_SetError("pcm_buf malloc failed\n"); }
return(-1); memset(pcm_buf,spec->silence,pcm_len);
}
memset(pcm_buf,spec->silence,pcm_len); #ifdef DEBUG_AUDIO
#ifdef DEBUG_AUDIO
fprintf(stderr,"pcm_buf malloced and silenced.\n"); fprintf(stderr,"pcm_buf malloced and silenced.\n");
#endif #endif
/* get the file descriptor */ /* get the file descriptor */
if( (audio_fd = snd_pcm_file_descriptor(audio_handle, SND_PCM_CHANNEL_PLAYBACK)) < 0) if( (audio_fd = snd_pcm_file_descriptor(audio_handle, SND_PCM_CHANNEL_PLAYBACK)) < 0){
{ fprintf(stderr, "snd_pcm_file_descriptor failed with error code: %d\n", audio_fd);
fprintf(stderr, "snd_pcm_file_descriptor failed with error code: %d\n", audio_fd); }
}
/* Trigger audio playback */ /* Trigger audio playback */
rval = snd_pcm_plugin_prepare( audio_handle, SND_PCM_CHANNEL_PLAYBACK); rval = snd_pcm_plugin_prepare( audio_handle, SND_PCM_CHANNEL_PLAYBACK);
if (rval < 0) { if (rval < 0) {
SDL_SetError("snd_pcm_plugin_prepare failed: %s\n", snd_strerror (rval)); SDL_SetError("snd_pcm_plugin_prepare failed: %s\n", snd_strerror (rval));
return(-1); return(-1);
} }
this->enabled = 1; this->enabled = 1;
/* Get the parent process id (we're the parent of the audio thread) */ /* Get the parent process id (we're the parent of the audio thread) */
parent = getpid(); parent = getpid();
...@@ -550,5 +495,3 @@ static int NTO_OpenAudio(_THIS, SDL_AudioSpec *spec) ...@@ -550,5 +495,3 @@ static int NTO_OpenAudio(_THIS, SDL_AudioSpec *spec)
return(0); return(0);
} }
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