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Sound api improvements, rockboy sound, contributed by xshock.

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Playback of sound currently only works in boost mode, needs fixing.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6226 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michiel Van Der Kolk 2005-03-28 00:00:24 +00:00
parent 853bc3dcf8
commit 451dd48adc
11 changed files with 208 additions and 62 deletions
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111
apps/plugins/rockboy/rbsound.c
View file

@ -1,47 +1,120 @@
#include "rockmacros.h"
#include "defs.h"
#include "pcm.h"
#include "rc.h"
#define RBSOUND
struct pcm pcm;
static byte buf[4096];
#define BUF_SIZE (8192)
#define DMA_PORTION (1024)
static short buf1_unal[(BUF_SIZE / sizeof(short)) + 2]; // to make sure 4 byte aligned
static short* buf1;
static short front_buf[512];
static short* last_back_pos;
static bool newly_started;
static int turns;
rcvar_t pcm_exports[] =
{
RCV_END
RCV_END
};
void pcm_init(void)
{
pcm.hz = 44100;
pcm.stereo = 1;
pcm.buf = buf;
pcm.len = sizeof buf;
pcm.pos = 0;
buf1 = (signed short*)((((unsigned int)buf1_unal) >> 2) << 2); /* here i just make sure that buffer is aligned to 4 bytes*/
newly_started = true;
last_back_pos = buf1;
turns = 0;
pcm.hz = 11025;
pcm.stereo = 1;
pcm.buf = front_buf;
pcm.len = (sizeof(front_buf)) / sizeof(short); /* length in shorts, not bytes */
pcm.pos = 0;
rb->pcm_play_stop();
rb->pcm_set_frequency(11025);
rb->pcm_set_volume(200);
}
void pcm_close(void)
{
memset(&pcm, 0, sizeof pcm);
memset(&pcm, 0, sizeof pcm);
newly_started = true;
last_back_pos = buf1;
rb->pcm_play_stop();
}
void get_more(unsigned char** start, long* size)
{
int length;
unsigned int sar = (unsigned int)SAR0;
length = ((unsigned int)buf1) + BUF_SIZE - sar;
if(turns > 0)
{
newly_started = true;
last_back_pos = buf1;
turns = 0;
return;
} /* sound will stop if no one feeds data*/
if(length <= 0)
{
*start = (unsigned char*)buf1;
*size = DMA_PORTION;
turns++;
}
else
{
*start = (unsigned char*)sar;
if(length > DMA_PORTION)
*size = DMA_PORTION;
else
*size = length;
}
}
int pcm_submit(void)
{
#ifdef RBSOUND
rb->pcm_play_data(pcm.buf,pcm.pos,NULL);
while(rb->pcm_is_playing()); /* spinlock */
pcm.pos = 0;
return 1;
#ifdef RBSOUND
while( (turns < 0) && ((((unsigned int)last_back_pos) + pcm.pos * sizeof(short)) > ((unsigned int)SAR0)) && !newly_started) rb->yield(); /* wait until data is passed through DAC or until exit*/
int shorts_left = ((((unsigned int)buf1) + BUF_SIZE) - ((unsigned int)last_back_pos)) / sizeof(short);
if( shorts_left >= pcm.pos )
{
memcpy(last_back_pos,pcm.buf,pcm.pos * sizeof(short));
last_back_pos = &last_back_pos[pcm.pos];
}
else
{
int last_pos = shorts_left;
memcpy(last_back_pos,pcm.buf,shorts_left * sizeof(short));
last_back_pos = buf1;
shorts_left = pcm.pos - shorts_left;
memcpy(last_back_pos,&pcm.buf[last_pos],shorts_left * sizeof(short));
last_back_pos = &buf1[shorts_left];
turns--;
}
if(newly_started)
{
rb->pcm_play_data((unsigned char*)buf1,pcm.pos * sizeof(short),&get_more);
newly_started = false;
}
pcm.pos = 0;
return 1;
#else
pcm.pos = 0;
return 0;
pcm.pos = 0;
return 0;
#endif
}