/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997-2006 Sam Lantinga

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Lesser General Public

License as published by the Free Software Foundation; either

version 2.1 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

Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public

License along with this library; if not, write to the Free Software

Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

Carsten Griwodz

griff@kom.tu-darmstadt.de

based on linux/SDL_dspaudio.c by Sam Lantinga

*/

/* Allow access to a raw mixing buffer */

#include <errno.h>

#include <unistd.h>

#include <fcntl.h>

#include <sys/types.h>

#include <sys/time.h>

#include <sys/ioctl.h>

#include <sys/stat.h>

#include <sys/mman.h>

#include "SDL_audio.h"

#include "SDL_audio_c.h"

#include "SDL_audiodev_c.h"

#include "SDL_umsaudio.h"

/* The tag name used by UMS audio */

#define UMS_DRIVER_NAME "ums"

#define DEBUG_AUDIO 1

/* Audio driver functions */

static int UMS_OpenAudio(_THIS, SDL_AudioSpec *spec);

static void UMS_PlayAudio(_THIS);

static Uint8 *UMS_GetAudioBuf(_THIS);

static void UMS_CloseAudio(_THIS);

static UMSAudioDevice_ReturnCode UADOpen(_THIS, string device, string mode, long flags);

static UMSAudioDevice_ReturnCode UADClose(_THIS);

static UMSAudioDevice_ReturnCode UADGetBitsPerSample(_THIS, long* bits);

static UMSAudioDevice_ReturnCode UADSetBitsPerSample(_THIS, long bits);

static UMSAudioDevice_ReturnCode UADSetSampleRate(_THIS, long rate, long* set_rate);

static UMSAudioDevice_ReturnCode UADSetByteOrder(_THIS, string byte_order);

static UMSAudioDevice_ReturnCode UADSetAudioFormatType(_THIS, string fmt);

static UMSAudioDevice_ReturnCode UADSetNumberFormat(_THIS, string fmt);

static UMSAudioDevice_ReturnCode UADInitialize(_THIS);

static UMSAudioDevice_ReturnCode UADStart(_THIS);

static UMSAudioDevice_ReturnCode UADStop(_THIS);

static UMSAudioDevice_ReturnCode UADSetTimeFormat(_THIS, UMSAudioTypes_TimeFormat fmt );

static UMSAudioDevice_ReturnCode UADWriteBuffSize(_THIS, long* buff_size );

static UMSAudioDevice_ReturnCode UADWriteBuffRemain(_THIS, long* buff_size );

static UMSAudioDevice_ReturnCode UADWriteBuffUsed(_THIS, long* buff_size );

static UMSAudioDevice_ReturnCode UADSetDMABufferSize(_THIS, long bytes, long* bytes_ret );

static UMSAudioDevice_ReturnCode UADSetVolume(_THIS, long volume );

static UMSAudioDevice_ReturnCode UADSetBalance(_THIS, long balance );

static UMSAudioDevice_ReturnCode UADSetChannels(_THIS, long channels );

static UMSAudioDevice_ReturnCode UADPlayRemainingData(_THIS, boolean block );

static UMSAudioDevice_ReturnCode UADEnableOutput(_THIS, string output, long* left_gain, long* right_gain);

static UMSAudioDevice_ReturnCode UADWrite(_THIS, UMSAudioTypes_Buffer* buff, long samples, long* samples_written);

/* Audio driver bootstrap functions */

static int Audio_Available(void)

{

return 1;

}

static void Audio_DeleteDevice(_THIS)

{

if(this->hidden->playbuf._buffer) SDL_free(this->hidden->playbuf._buffer);

if(this->hidden->fillbuf._buffer) SDL_free(this->hidden->fillbuf._buffer);

_somFree( this->hidden->umsdev );

SDL_free(this->hidden);

SDL_free(this);

}

static SDL_AudioDevice *Audio_CreateDevice(int devindex)

{

SDL_AudioDevice *this;

/*

* Allocate and initialize management storage and private management

* storage for this SDL-using library.

*/

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

if ( this ) {

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

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

}

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

SDL_OutOfMemory();

if ( this ) {

SDL_free(this);

}

return(0);

}

SDL_memset(this->hidden, 0, (sizeof *this->hidden));

#ifdef DEBUG_AUDIO

fprintf(stderr, "Creating UMS Audio device\n");

#endif

/*

* Calls for UMS env initialization and audio object construction.

*/

this->hidden->ev = somGetGlobalEnvironment();

this->hidden->umsdev = UMSAudioDeviceNew();

/*

* Set the function pointers.

*/

this->OpenAudio = UMS_OpenAudio;

this->WaitAudio = NULL; /* we do blocking output */

this->PlayAudio = UMS_PlayAudio;

this->GetAudioBuf = UMS_GetAudioBuf;

this->CloseAudio = UMS_CloseAudio;

this->free = Audio_DeleteDevice;

#ifdef DEBUG_AUDIO

fprintf(stderr, "done\n");

#endif

return this;

}

AudioBootStrap UMS_bootstrap = {

UMS_DRIVER_NAME, "AUX UMS audio",

Audio_Available, Audio_CreateDevice

};

static Uint8 *UMS_GetAudioBuf(_THIS)

{

#ifdef DEBUG_AUDIO

fprintf(stderr, "enter UMS_GetAudioBuf\n");

#endif

return this->hidden->fillbuf._buffer;

/*

long bufSize;

UMSAudioDevice_ReturnCode rc;

rc = UADSetTimeFormat(this, UMSAudioTypes_Bytes );

rc = UADWriteBuffSize(this, bufSize );

*/

}

static void UMS_CloseAudio(_THIS)

{

UMSAudioDevice_ReturnCode rc;

#ifdef DEBUG_AUDIO

fprintf(stderr, "enter UMS_CloseAudio\n");

#endif

rc = UADPlayRemainingData(this, TRUE);

rc = UADStop(this);

rc = UADClose(this);

}

static void UMS_PlayAudio(_THIS)

{

UMSAudioDevice_ReturnCode rc;

long samplesToWrite;

long samplesWritten;

UMSAudioTypes_Buffer swpbuf;

#ifdef DEBUG_AUDIO

fprintf(stderr, "enter UMS_PlayAudio\n");

#endif

samplesToWrite = this->hidden->playbuf._length/this->hidden->bytesPerSample;

do

{

rc = UADWrite(this, &this->hidden->playbuf,

samplesToWrite,

&samplesWritten );

samplesToWrite -= samplesWritten;

/* rc values: UMSAudioDevice_Success

* UMSAudioDevice_Failure

* UMSAudioDevice_Preempted

* UMSAudioDevice_Interrupted

* UMSAudioDevice_DeviceError

*/

if ( rc == UMSAudioDevice_DeviceError ) {

#ifdef DEBUG_AUDIO

fprintf(stderr, "Returning from PlayAudio with devices error\n");

#endif

return;

}

}

while(samplesToWrite>0);

SDL_LockAudio();

SDL_memcpy( &swpbuf, &this->hidden->playbuf, sizeof(UMSAudioTypes_Buffer) );

SDL_memcpy( &this->hidden->playbuf, &this->hidden->fillbuf, sizeof(UMSAudioTypes_Buffer) );

SDL_memcpy( &this->hidden->fillbuf, &swpbuf, sizeof(UMSAudioTypes_Buffer) );

SDL_UnlockAudio();

#ifdef DEBUG_AUDIO

fprintf(stderr, "Wrote audio data and swapped buffer\n");

#endif

}

#if 0

// /* Set the DSP frequency */

// value = spec->freq;

// if ( ioctl(this->hidden->audio_fd, SOUND_PCM_WRITE_RATE, &value) < 0 ) {

// SDL_SetError("Couldn't set audio frequency");

// return(-1);

// }

// spec->freq = value;

#endif

static int UMS_OpenAudio(_THIS, SDL_AudioSpec *spec)

{

char* audiodev = "/dev/paud0";

long lgain;

long rgain;

long outRate;

long outBufSize;

long bitsPerSample;

long samplesPerSec;

long success;

Uint16 test_format;

int frag_spec;

UMSAudioDevice_ReturnCode rc;

#ifdef DEBUG_AUDIO

fprintf(stderr, "enter UMS_OpenAudio\n");

#endif

rc = UADOpen(this, audiodev,"PLAY", UMSAudioDevice_BlockingIO);

if ( rc != UMSAudioDevice_Success ) {

SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));

return -1;

}

rc = UADSetAudioFormatType(this, "PCM");

success = 0;

test_format = SDL_FirstAudioFormat(spec->format);

do

{

#ifdef DEBUG_AUDIO

fprintf(stderr, "Trying format 0x%4.4x\n", test_format);

#endif

switch ( test_format )

{

case AUDIO_U8:

/* from the mac code: better ? */

/* sample_bits = spec->size / spec->samples / spec->channels * 8; */

success = 1;

bitsPerSample = 8;

rc = UADSetSampleRate(this, spec->freq << 16, &outRate );

rc = UADSetByteOrder(this, "MSB"); /* irrelevant */

rc = UADSetNumberFormat(this, "UNSIGNED");

break;

case AUDIO_S8:

success = 1;

bitsPerSample = 8;

rc = UADSetSampleRate(this, spec->freq << 16, &outRate );

rc = UADSetByteOrder(this, "MSB"); /* irrelevant */

rc = UADSetNumberFormat(this, "SIGNED");

break;

case AUDIO_S16LSB:

success = 1;

bitsPerSample = 16;

rc = UADSetSampleRate(this, spec->freq << 16, &outRate );

rc = UADSetByteOrder(this, "LSB");

rc = UADSetNumberFormat(this, "SIGNED");

break;

case AUDIO_S16MSB:

success = 1;

bitsPerSample = 16;

rc = UADSetSampleRate(this, spec->freq << 16, &outRate );

rc = UADSetByteOrder(this, "MSB");

rc = UADSetNumberFormat(this, "SIGNED");

break;

case AUDIO_U16LSB:

success = 1;

bitsPerSample = 16;

rc = UADSetSampleRate(this, spec->freq << 16, &outRate );

rc = UADSetByteOrder(this, "LSB");

rc = UADSetNumberFormat(this, "UNSIGNED");

break;

case AUDIO_U16MSB:

success = 1;

bitsPerSample = 16;

rc = UADSetSampleRate(this, spec->freq << 16, &outRate );

rc = UADSetByteOrder(this, "MSB");

rc = UADSetNumberFormat(this, "UNSIGNED");

break;

default:

break;

}

if ( ! success ) {

test_format = SDL_NextAudioFormat();

}

}

while ( ! success && test_format );

if ( success == 0 ) {

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

return -1;

}

spec->format = test_format;

for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec );

if ( (0x01<<frag_spec) != spec->size ) {

SDL_SetError("Fragment size must be a power of two");

return -1;

}

if ( frag_spec > 2048 ) frag_spec = 2048;

this->hidden->bytesPerSample = (bitsPerSample / 8) * spec->channels;

samplesPerSec = this->hidden->bytesPerSample * outRate;

this->hidden->playbuf._length = 0;

this->hidden->playbuf._maximum = spec->size;

this->hidden->playbuf._buffer = (unsigned char*)SDL_malloc(spec->size);

this->hidden->fillbuf._length = 0;

this->hidden->fillbuf._maximum = spec->size;

this->hidden->fillbuf._buffer = (unsigned char*)SDL_malloc(spec->size);

rc = UADSetBitsPerSample(this, bitsPerSample );

rc = UADSetDMABufferSize(this, frag_spec, &outBufSize );

rc = UADSetChannels(this, spec->channels); /* functions reduces to mono or stereo */

lgain = 100; /*maximum left input gain*/

rgain = 100; /*maimum right input gain*/

rc = UADEnableOutput(this, "LINE_OUT",&lgain,&rgain);

rc = UADInitialize(this);

rc = UADStart(this);

rc = UADSetVolume(this, 100);

rc = UADSetBalance(this, 0);

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

return 0;

}



static UMSAudioDevice_ReturnCode UADGetBitsPerSample(_THIS, long* bits)

{

return UMSAudioDevice_get_bits_per_sample( this->hidden->umsdev,

this->hidden->ev,

bits );

}

static UMSAudioDevice_ReturnCode UADSetBitsPerSample(_THIS, long bits)

{

return UMSAudioDevice_set_bits_per_sample( this->hidden->umsdev,

this->hidden->ev,

bits );

}

static UMSAudioDevice_ReturnCode UADSetSampleRate(_THIS, long rate, long* set_rate)

{

/* from the mac code: sample rate = spec->freq << 16; */

return UMSAudioDevice_set_sample_rate( this->hidden->umsdev,

this->hidden->ev,

rate,

set_rate );

}

static UMSAudioDevice_ReturnCode UADSetByteOrder(_THIS, string byte_order)

{

return UMSAudioDevice_set_byte_order( this->hidden->umsdev,

this->hidden->ev,

byte_order );

}

static UMSAudioDevice_ReturnCode UADSetAudioFormatType(_THIS, string fmt)

{

/* possible PCM, A_LAW or MU_LAW */

return UMSAudioDevice_set_audio_format_type( this->hidden->umsdev,

this->hidden->ev,

fmt );

}

static UMSAudioDevice_ReturnCode UADSetNumberFormat(_THIS, string fmt)

{

/* possible SIGNED, UNSIGNED, or TWOS_COMPLEMENT */

return UMSAudioDevice_set_number_format( this->hidden->umsdev,

this->hidden->ev,

fmt );

}

static UMSAudioDevice_ReturnCode UADInitialize(_THIS)

{

return UMSAudioDevice_initialize( this->hidden->umsdev,

this->hidden->ev );

}

static UMSAudioDevice_ReturnCode UADStart(_THIS)

{

return UMSAudioDevice_start( this->hidden->umsdev,

this->hidden->ev );

}

static UMSAudioDevice_ReturnCode UADSetTimeFormat(_THIS, UMSAudioTypes_TimeFormat fmt )

{

/*

* Switches the time format to the new format, immediately.

* possible UMSAudioTypes_Msecs, UMSAudioTypes_Bytes or UMSAudioTypes_Samples

*/

return UMSAudioDevice_set_time_format( this->hidden->umsdev,

this->hidden->ev,

fmt );

}

static UMSAudioDevice_ReturnCode UADWriteBuffSize(_THIS, long* buff_size )

{

/*

* returns write buffer size in the current time format

*/

return UMSAudioDevice_write_buff_size( this->hidden->umsdev,

this->hidden->ev,

buff_size );

}

static UMSAudioDevice_ReturnCode UADWriteBuffRemain(_THIS, long* buff_size )

{

/*

* returns amount of available space in the write buffer

* in the current time format

*/

return UMSAudioDevice_write_buff_remain( this->hidden->umsdev,

this->hidden->ev,

buff_size );

}

static UMSAudioDevice_ReturnCode UADWriteBuffUsed(_THIS, long* buff_size )

{

/*

* returns amount of filled space in the write buffer

* in the current time format

*/

return UMSAudioDevice_write_buff_used( this->hidden->umsdev,

this->hidden->ev,

buff_size );

}

static UMSAudioDevice_ReturnCode UADSetDMABufferSize(_THIS, long bytes, long* bytes_ret )

{

/*

* Request a new DMA buffer size, maximum requested size 2048.

* Takes effect with next initialize() call.

* Devices may or may not support DMA.

*/

return UMSAudioDevice_set_DMA_buffer_size( this->hidden->umsdev,

this->hidden->ev,

bytes,

bytes_ret );

}

static UMSAudioDevice_ReturnCode UADSetVolume(_THIS, long volume )

{

/*

* Set the volume.

* Takes effect immediately.

*/

return UMSAudioDevice_set_volume( this->hidden->umsdev,

this->hidden->ev,

volume );

}

static UMSAudioDevice_ReturnCode UADSetBalance(_THIS, long balance )

{

/*

* Set the balance.

* Takes effect immediately.

*/

return UMSAudioDevice_set_balance( this->hidden->umsdev,

this->hidden->ev,

balance );

}

static UMSAudioDevice_ReturnCode UADSetChannels(_THIS, long channels )

{

/*

* Set mono or stereo.

* Takes effect with next initialize() call.

*/

if ( channels != 1 ) channels = 2;

return UMSAudioDevice_set_number_of_channels( this->hidden->umsdev,

this->hidden->ev,

channels );

}

static UMSAudioDevice_ReturnCode UADOpen(_THIS, string device, string mode, long flags)

{

return UMSAudioDevice_open( this->hidden->umsdev,

this->hidden->ev,

device,

mode,

flags );

}

static UMSAudioDevice_ReturnCode UADWrite(_THIS, UMSAudioTypes_Buffer* buff,

long samples,

long* samples_written)

{

return UMSAudioDevice_write( this->hidden->umsdev,

this->hidden->ev,

buff,

samples,

samples_written );

}

static UMSAudioDevice_ReturnCode UADPlayRemainingData(_THIS, boolean block )

{

return UMSAudioDevice_play_remaining_data( this->hidden->umsdev,

this->hidden->ev,

block);

}

static UMSAudioDevice_ReturnCode UADStop(_THIS)

{

return UMSAudioDevice_stop( this->hidden->umsdev,

this->hidden->ev );

}

static UMSAudioDevice_ReturnCode UADClose(_THIS)

{

return UMSAudioDevice_close( this->hidden->umsdev,

this->hidden->ev );

}

static UMSAudioDevice_ReturnCode UADEnableOutput(_THIS, string output, long* left_gain, long* right_gain)

{

return UMSAudioDevice_enable_output( this->hidden->umsdev,

this->hidden->ev,

output,

left_gain,

right_gain );

}