/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997-2004 Sam Lantinga

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 library 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

Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

Sam Lantinga

slouken@libsdl.org

*/

#include <errno.h>

#include <unistd.h>

#include <fcntl.h>

#include <signal.h>

#include <sys/types.h>

#include <sys/time.h>

#include <sched.h>

#include <sys/select.h>

#include <sys/neutrino.h>

#include <sys/asoundlib.h>

#include "SDL_timer.h"

#include "SDL_audio.h"

#include "SDL_audiomem.h"

#include "SDL_audio_c.h"

#include "SDL_nto_audio.h"

/* The tag name used by NTO audio */

#define DRIVER_NAME "qsa-nto"

/* default channel communication parameters */

#define DEFAULT_CPARAMS_RATE 22050

#define DEFAULT_CPARAMS_VOICES 1

/* FIXME: need to add in the near future flexible logic with frag_size and frags count */

#define DEFAULT_CPARAMS_FRAG_SIZE 4096

#define DEFAULT_CPARAMS_FRAGS_MIN 1

#define DEFAULT_CPARAMS_FRAGS_MAX 1

/* Open the audio device for playback, and don't block if busy */

#define OPEN_FLAGS SND_PCM_OPEN_PLAYBACK

#define QSA_NO_WORKAROUNDS 0x00000000

#define QSA_MMAP_WORKAROUND 0x00000001

struct BuggyCards

};

#define QSA_WA_CARDS 3

struct BuggyCards buggycards[QSA_WA_CARDS]=

{

{"Sound Blaster Live!", QSA_MMAP_WORKAROUND},

{"Vortex 8820", QSA_MMAP_WORKAROUND},

{"Vortex 8830", QSA_MMAP_WORKAROUND},

};

/* Audio driver functions */

static void NTO_ThreadInit(_THIS);

static int NTO_OpenAudio(_THIS, SDL_AudioSpec* spec);

static void NTO_WaitAudio(_THIS);

static void NTO_PlayAudio(_THIS);

static Uint8* NTO_GetAudioBuf(_THIS);

static void NTO_CloseAudio(_THIS);

/* card names check to apply the workarounds */

static int NTO_CheckBuggyCards(_THIS, unsigned long checkfor)

{

char scardname[33];

int it;

if (snd_card_get_name(cardno, scardname, 32)<0)

{

return 0;

}

for (it=0; it<QSA_WA_CARDS; it++)

{

if (SDL_strcmp(buggycards[it].cardname, scardname)==0)

{

if (buggycards[it].bugtype==checkfor)

{

return 1;

}

}

}

return 0;

}

static void NTO_ThreadInit(_THIS)

{

int status;

struct sched_param param;

/* increasing default 10 priority to 25 to avoid jerky sound */

status=SchedGet(0, 0, &param);

param.sched_priority=param.sched_curpriority+15;

status=SchedSet(0, 0, SCHED_NOCHANGE, &param);

}

/* PCM transfer channel parameters initialize function */

static void NTO_InitAudioParams(snd_pcm_channel_params_t* cpars)

{

SDL_memset(cpars, 0, sizeof(snd_pcm_channel_params_t));

cpars->channel = SND_PCM_CHANNEL_PLAYBACK;

cpars->mode = SND_PCM_MODE_BLOCK;

cpars->start_mode = SND_PCM_START_DATA;

cpars->stop_mode = SND_PCM_STOP_STOP;

cpars->format.format = SND_PCM_SFMT_S16_LE;

cpars->format.interleave = 1;

cpars->format.rate = DEFAULT_CPARAMS_RATE;

cpars->format.voices = DEFAULT_CPARAMS_VOICES;

cpars->buf.block.frag_size = DEFAULT_CPARAMS_FRAG_SIZE;

cpars->buf.block.frags_min = DEFAULT_CPARAMS_FRAGS_MIN;

cpars->buf.block.frags_max = DEFAULT_CPARAMS_FRAGS_MAX;

}

static int NTO_AudioAvailable(void)

{

/* See if we can open a nonblocking channel.

Return value '1' means we can.

Return value '0' means we cannot. */

int available;

int rval;

snd_pcm_t* handle;

available = 0;

handle = NULL;

rval = snd_pcm_open_preferred(&handle, NULL, NULL, OPEN_FLAGS);

if (rval >= 0)

{

available = 1;

if ((rval = snd_pcm_close(handle)) < 0)

{

SDL_SetError("NTO_AudioAvailable(): snd_pcm_close failed: %s\n", snd_strerror(rval));

available = 0;

}

}

else

{

SDL_SetError("NTO_AudioAvailable(): there are no available audio devices.\n");

}

return (available);

}

static void NTO_DeleteAudioDevice(SDL_AudioDevice *device)

{

if ((device)&&(device->hidden))

{

SDL_free(device->hidden);

}

if (device)

{

SDL_free(device);

}

}

static SDL_AudioDevice* NTO_CreateAudioDevice(int devindex)

{

SDL_AudioDevice *this;

/* Initialize all variables that we clean on shutdown */

this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));

if (this)

{

SDL_memset(this, 0, sizeof(SDL_AudioDevice));

this->hidden = (struct SDL_PrivateAudioData *)SDL_malloc(sizeof(struct SDL_PrivateAudioData));

}

if ((this == NULL) || (this->hidden == NULL))

{

SDL_OutOfMemory();

if (this)

{

SDL_free(this);

}

return (0);

}

SDL_memset(this->hidden, 0, sizeof(struct SDL_PrivateAudioData));

audio_handle = NULL;

/* Set the function pointers */

this->ThreadInit = NTO_ThreadInit;

this->OpenAudio = NTO_OpenAudio;

this->WaitAudio = NTO_WaitAudio;

this->PlayAudio = NTO_PlayAudio;

this->GetAudioBuf = NTO_GetAudioBuf;

this->CloseAudio = NTO_CloseAudio;

this->free = NTO_DeleteAudioDevice;

return this;

}

AudioBootStrap QNXNTOAUDIO_bootstrap =

{

DRIVER_NAME, "QNX6 QSA-NTO Audio",

NTO_AudioAvailable,

NTO_CreateAudioDevice

};

/* This function waits until it is possible to write a full sound buffer */

static void NTO_WaitAudio(_THIS)

{

fd_set wfds;

int selectret;

FD_ZERO(&wfds);

FD_SET(audio_fd, &wfds);

do {

selectret=select(audio_fd + 1, NULL, &wfds, NULL, NULL);

switch (selectret)

{

case -1:

case 0: SDL_SetError("NTO_WaitAudio(): select() failed: %s\n", strerror(errno));

return;

default: if (FD_ISSET(audio_fd, &wfds))

{

return;

}

break;

}

} while(1);

}

static void NTO_PlayAudio(_THIS)

{

int written, rval;

int towrite;

void* pcmbuffer;

if (!this->enabled)

{

return;

}

towrite = this->spec.size;

pcmbuffer = pcm_buf;

/* Write the audio data, checking for EAGAIN (buffer full) and underrun */

do {

written = snd_pcm_plugin_write(audio_handle, pcm_buf, towrite);

if (written != towrite)

{

if ((errno == EAGAIN) || (errno == EWOULDBLOCK))

{

/* Let a little CPU time go by and try to write again */

SDL_Delay(1);

/* if we wrote some data */

towrite -= written;

pcmbuffer += written * this->spec.channels;

continue;

}

else

{

if ((errno == EINVAL) || (errno == EIO))

{

SDL_memset(&cstatus, 0, sizeof(cstatus));

cstatus.channel = SND_PCM_CHANNEL_PLAYBACK;

if ((rval = snd_pcm_plugin_status(audio_handle, &cstatus)) < 0)

{

SDL_SetError("NTO_PlayAudio(): snd_pcm_plugin_status failed: %s\n", snd_strerror(rval));

return;

}

if ((cstatus.status == SND_PCM_STATUS_UNDERRUN) || (cstatus.status == SND_PCM_STATUS_READY))

{

if ((rval = snd_pcm_plugin_prepare(audio_handle, SND_PCM_CHANNEL_PLAYBACK)) < 0)

{

SDL_SetError("NTO_PlayAudio(): snd_pcm_plugin_prepare failed: %s\n", snd_strerror(rval));

return;

}

}

continue;

}

else

{

return;

}

}

}

else

{

/* we wrote all remaining data */

towrite -= written;

pcmbuffer += written * this->spec.channels;

}

} while ((towrite > 0) && (this->enabled));

/* If we couldn't write, assume fatal error for now */

if (towrite != 0)

{

this->enabled = 0;

}

return;

}

static Uint8* NTO_GetAudioBuf(_THIS)

{

return pcm_buf;

}

static void NTO_CloseAudio(_THIS)

{

int rval;

this->enabled = 0;

if (audio_handle != NULL)

{

if ((rval = snd_pcm_plugin_flush(audio_handle, SND_PCM_CHANNEL_PLAYBACK)) < 0)

{

SDL_SetError("NTO_CloseAudio(): snd_pcm_plugin_flush failed: %s\n", snd_strerror(rval));

return;

}

if ((rval = snd_pcm_close(audio_handle)) < 0)

{

SDL_SetError("NTO_CloseAudio(): snd_pcm_close failed: %s\n",snd_strerror(rval));

return;

}

audio_handle = NULL;

}

}

static int NTO_OpenAudio(_THIS, SDL_AudioSpec* spec)

{

int rval;

int format;

Uint16 test_format;

int found;

audio_handle = NULL;

this->enabled = 0;

if (pcm_buf != NULL)

{

SDL_FreeAudioMem(pcm_buf);

pcm_buf = NULL;

}

/* initialize channel transfer parameters to default */

NTO_InitAudioParams(&cparams);

/* Open the audio device */

rval = snd_pcm_open_preferred(&audio_handle, &cardno, &deviceno, OPEN_FLAGS);

if (rval < 0)

{

SDL_SetError("NTO_OpenAudio(): snd_pcm_open failed: %s\n", snd_strerror(rval));

return (-1);

}

if (!NTO_CheckBuggyCards(this, QSA_MMAP_WORKAROUND))

{

/* 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 */

format = 0;

/* can't use format as SND_PCM_SFMT_U8 = 0 in nto */

found = 0;

for (test_format=SDL_FirstAudioFormat(spec->format); !found ;)

{

/* if match found set format to equivalent ALSA format */

switch (test_format)

{

case AUDIO_U8:

format = SND_PCM_SFMT_U8;

found = 1;

break;

case AUDIO_S8:

format = SND_PCM_SFMT_S8;

found = 1;

break;

case AUDIO_S16LSB:

format = SND_PCM_SFMT_S16_LE;

found = 1;

break;

case AUDIO_S16MSB:

format = SND_PCM_SFMT_S16_BE;

found = 1;

break;

case AUDIO_U16LSB:

format = SND_PCM_SFMT_U16_LE;

found = 1;

break;

case AUDIO_U16MSB:

format = SND_PCM_SFMT_U16_BE;

found = 1;

break;

default:

break;

}

if (!found)

{

test_format = SDL_NextAudioFormat();

}

}

/* assumes test_format not 0 on success */

if (test_format == 0)

{

SDL_SetError("NTO_OpenAudio(): Couldn't find any hardware audio formats");

return (-1);

}

spec->format = test_format;

/* Set the audio format */

cparams.format.format = format;

/* Set mono or stereo audio (currently only two channels supported) */

cparams.format.voices = spec->channels;

/* Set rate */

cparams.format.rate = spec->freq;

/* Setup the transfer parameters according to cparams */

rval = snd_pcm_plugin_params(audio_handle, &cparams);

if (rval < 0)

{

SDL_SetError("NTO_OpenAudio(): snd_pcm_channel_params failed: %s\n", snd_strerror(rval));

return (-1);

}

/* Make sure channel is setup right one last time */

SDL_memset(&csetup, 0x00, sizeof(csetup));

csetup.channel = SND_PCM_CHANNEL_PLAYBACK;

if (snd_pcm_plugin_setup(audio_handle, &csetup) < 0)

{

SDL_SetError("NTO_OpenAudio(): Unable to setup playback channel\n");

return -1;

}

/* Calculate the final parameters for this audio specification */

SDL_CalculateAudioSpec(spec);

pcm_len = spec->size;

if (pcm_len==0)

{

pcm_len = csetup.buf.block.frag_size * spec->channels * (snd_pcm_format_width(format)/8);

}

/* Allocate memory to the audio buffer and initialize with silence (Note that

buffer size must be a multiple of fragment size, so find closest multiple)

*/

pcm_buf = (Uint8*)SDL_AllocAudioMem(pcm_len);

if (pcm_buf == NULL)

{

SDL_SetError("NTO_OpenAudio(): pcm buffer allocation failed\n");

return (-1);

}

SDL_memset(pcm_buf, spec->silence, pcm_len);

/* get the file descriptor */

if ((audio_fd = snd_pcm_file_descriptor(audio_handle, SND_PCM_CHANNEL_PLAYBACK)) < 0)

{

SDL_SetError("NTO_OpenAudio(): snd_pcm_file_descriptor failed with error code: %s\n", snd_strerror(rval));

return (-1);

}

/* Trigger audio playback */

rval = snd_pcm_plugin_prepare(audio_handle, SND_PCM_CHANNEL_PLAYBACK);

if (rval < 0)

{

SDL_SetError("snd_pcm_plugin_prepare failed: %s\n", snd_strerror(rval));

return (-1);

}

this->enabled = 1;

/* Get the parent process id (we're the parent of the audio thread) */

parent = getpid();

/* We're really ready to rock and roll. :-) */

return (0);

}