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Small refactoring + cleanup

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This commit is contained in:
simon.kagstrom 2009-01-05 17:28:38 +00:00
parent bc8ae7ea85
commit 1ff938c50c
2 changed files with 20 additions and 17 deletions
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35
Src/gcaudio.c
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@ -15,9 +15,15 @@
#define SAMPLERATE 48000
#define MIXBUFSIZE_BYTES 16000
#define MIXBUFSIZE_SHORT (MIXBUFSIZE_BYTES / 2)
#define MIXBUFSIZE_WORDS (MIXBUFSIZE_BYTES / 4)
#define SOUNDBUFSIZE 3840
static u8 ConfigRequested = 0;
static u8 soundbuffer[2][3840] ATTRIBUTE_ALIGN(32);
static u8 mixbuffer[16000];
static u8 soundbuffer[2][SOUNDBUFSIZE] ATTRIBUTE_ALIGN(32);
static u8 mixbuffer[MIXBUFSIZE_BYTES];
static int mixhead = 0;
static int mixtail = 0;
static int whichab = 0;
@ -41,14 +47,14 @@ static int MixerCollect( u8 *outbuffer, int len )
while ( ( mixtail != mixhead ) && ( done < len ) )
{
*dst++ = src[mixtail++];
if (mixtail == 4000) mixtail = 0;
if (mixtail == MIXBUFSIZE_WORDS) mixtail = 0;
done += 4;
}
// Realign to 32 bytes for DMA
mixtail -= ((done&0x1f) >> 2);
if (mixtail < 0)
mixtail += 4000;
mixtail += MIXBUFSIZE_WORDS;
done &= ~0x1f;
if (!done)
return len >> 1;
@ -65,7 +71,7 @@ static void AudioSwitchBuffers()
{
if ( !ConfigRequested )
{
int len = MixerCollect( soundbuffer[whichab], 3840 );
int len = MixerCollect( soundbuffer[whichab], SOUNDBUFSIZE );
DCFlushRange(soundbuffer[whichab], len);
AUDIO_InitDMA((u32)soundbuffer[whichab], len);
AUDIO_StartDMA();
@ -85,8 +91,8 @@ void InitialiseAudio()
AUDIO_Init(NULL); // Start audio subsystem
AUDIO_SetDSPSampleRate(AI_SAMPLERATE_48KHZ);
AUDIO_RegisterDMACallback( AudioSwitchBuffers );
memset(soundbuffer, 0, 3840*2);
memset(mixbuffer, 0, 16000);
memset(soundbuffer, 0, SOUNDBUFSIZE*2);
memset(mixbuffer, 0, MIXBUFSIZE_BYTES);
}
/****************************************************************************
@ -107,8 +113,8 @@ void StopAudio()
***************************************************************************/
void ResetAudio()
{
memset(soundbuffer, 0, 3840*2);
memset(mixbuffer, 0, 16000);
memset(soundbuffer, 0, SOUNDBUFSIZE*2);
memset(mixbuffer, 0, MIXBUFSIZE_BYTES);
mixhead = mixtail = 0;
}
@ -120,21 +126,18 @@ void ResetAudio()
****************************************************************************/
void PlaySound( int16_t *Buffer, int count )
{
int i;
u16 sample;
u32 *dst = (u32 *)mixbuffer;
u32 level;
int i;
/* Protect against interrupts while adjusting head */
level = IRQ_Disable();
for( i = 0; i < count; i++ )
{
u16 sample;
sample = (Buffer[i] & 0xffff);
dst[mixhead++] = sample | ( sample << 16);
if (mixhead == 4000)
if (mixhead == MIXBUFSIZE_WORDS)
mixhead = 0;
}
IRQ_Restore(level);
// Restart Sound Processing if stopped
if (IsPlaying == 0)