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Using linker symbols for mp3 buffer

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@697 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Björn Stenberg 2002-05-24 15:27:55 +00:00
parent 6eb771721c
commit 3c2607790d
1 changed files with 105 additions and 39 deletions
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144
firmware/mpeg.c
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@ -29,7 +29,6 @@
#include "file.h"
#define MPEG_STACK_SIZE 0x2000
#define MPEG_BUFSIZE 0x100000
#define MPEG_CHUNKSIZE 0x20000
#define MPEG_LOW_WATER 0x30000
@ -118,7 +117,11 @@ static unsigned char fliptable[] =
static struct event_queue mpeg_queue;
static int mpeg_stack[MPEG_STACK_SIZE/sizeof(int)];
static unsigned char mp3buf[ MPEG_BUFSIZE ];
/* defined in linker script */
extern unsigned char mp3buf[];
extern unsigned char mp3end[];
static int mp3buflen;
static int mp3buf_write;
static int mp3buf_read;
@ -214,6 +217,52 @@ static void reset_mp3_buffer(void)
mp3buf_write = 0;
}
#pragma interrupt
void IRQ6(void)
{
stop_dma();
}
#pragma interrupt
void DEI3(void)
{
int unplayed_space_left;
int space_until_end_of_buffer;
if(playing)
{
mp3buf_read += last_dma_chunk_size;
if(mp3buf_read >= mp3buflen)
mp3buf_read = 0;
unplayed_space_left = mp3buf_write - mp3buf_read;
if(unplayed_space_left < 0)
unplayed_space_left = mp3buflen + unplayed_space_left;
space_until_end_of_buffer = mp3buflen - mp3buf_read;
if(!filling && unplayed_space_left < MPEG_LOW_WATER)
{
queue_post(&mpeg_queue, MPEG_NEED_DATA, 0);
}
if(unplayed_space_left)
{
last_dma_chunk_size = MIN(65536, unplayed_space_left);
last_dma_chunk_size = MIN(last_dma_chunk_size, space_until_end_of_buffer);
DTCR3 = last_dma_chunk_size & 0xffff;
SAR3 = (unsigned int)mp3buf + mp3buf_read;
}
else
{
DEBUGF("No more MP3 data. Stopping.\n");
CHCR3 = 0; /* Stop DMA interrupt */
}
}
CHCR3 &= ~0x0002; /* Clear DMA interrupt */
}
#pragma interrupt
void IMIA1(void)
{
@ -239,6 +288,7 @@ static void mpeg_thread(void)
switch(ev.id)
{
case MPEG_PLAY:
DEBUGF("MPEG_PLAY %s\n",ev.data);
/* Stop the current stream */
play_pending = false;
playing = false;
@ -263,18 +313,21 @@ static void mpeg_thread(void)
break;
case MPEG_STOP:
DEBUGF("MPEG_STOP\n");
/* Stop the current stream */
playing = false;
stop_dma();
break;
case MPEG_PAUSE:
DEBUGF("MPEG_PAUSE\n");
/* Stop the current stream */
playing = false;
stop_dma();
break;
case MPEG_RESUME:
DEBUGF("MPEG_RESUME\n");
/* Stop the current stream */
playing = true;
start_dma();
@ -285,7 +338,7 @@ static void mpeg_thread(void)
/* We interpret 0 as "empty buffer" */
if(free_space_left <= 0)
free_space_left = MPEG_BUFSIZE + free_space_left;
free_space_left = mp3buflen + free_space_left;
if(free_space_left <= MPEG_CHUNKSIZE)
{
@ -295,7 +348,7 @@ static void mpeg_thread(void)
}
amount_to_read = MIN(MPEG_CHUNKSIZE, free_space_left);
amount_to_read = MIN(MPEG_BUFSIZE - mp3buf_write, amount_to_read);
amount_to_read = MIN(mp3buflen - mp3buf_write, amount_to_read);
/* Read in a few seconds worth of MP3 data. We don't want to
read too large chunks because the bitswapping will take
@ -309,7 +362,7 @@ static void mpeg_thread(void)
bitswap(mp3buf + mp3buf_write, len);
mp3buf_write += len;
if(mp3buf_write >= MPEG_BUFSIZE)
if(mp3buf_write >= mp3buflen)
{
mp3buf_write = 0;
DEBUGF("W\n");
@ -406,11 +459,51 @@ static void setup_sci0(void)
SCR0 |= 0x20;
}
void mpeg_play(char* trackname)
{
queue_post(&mpeg_queue, MPEG_PLAY, trackname);
}
void mpeg_stop(void)
{
queue_post(&mpeg_queue, MPEG_STOP, NULL);
}
void mpeg_pause(void)
{
queue_post(&mpeg_queue, MPEG_PAUSE, NULL);
}
void mpeg_resume(void)
{
queue_post(&mpeg_queue, MPEG_RESUME, NULL);
}
void mpeg_volume(int percent)
{
int volume = 0x2c * percent / 100;
dac_volume(volume);
}
void mpeg_bass(int percent)
{
int bass = 15 * percent / 100;
mas_writereg(MAS_REG_KBASS, bass_table[bass]);
}
void mpeg_treble(int percent)
{
int treble = 15 * percent / 100;
mas_writereg(MAS_REG_KTREBLE, treble_table[treble]);
}
void mpeg_init(void)
{
int rc;
setup_sci0();
i2c_init();
#ifdef DEBUG
{
@ -453,42 +546,15 @@ void mpeg_init(void)
mas_poll_start(2);
mas_writereg(MAS_REG_KPRESCALE, 0xe9400);
}
void mpeg_play(char* trackname)
{
queue_post(&mpeg_queue, MPEG_PLAY, trackname);
}
mp3buflen = mp3end - mp3buf;
void mpeg_stop(void)
{
queue_post(&mpeg_queue, MPEG_STOP, NULL);
}
if(dac_config(0x04) < 0) {
DEBUGF("dac_config() failed\n");
}
void mpeg_pause(void)
{
queue_post(&mpeg_queue, MPEG_PAUSE, NULL);
}
mpeg_volume(70);
mpeg_bass(50);
mpeg_treble(50);
void mpeg_resume(void)
{
queue_post(&mpeg_queue, MPEG_RESUME, NULL);
}
void mpeg_volume(int percent)
{
int volume = 0x2c * percent / 100;
dac_volume(volume);
}
void mpeg_bass(int percent)
{
int bass = 15 * percent / 100;
mas_writereg(MAS_REG_KBASS, bass_table[bass]);
}
void mpeg_treble(int percent)
{
int treble = 15 * percent / 100;
mas_writereg(MAS_REG_KTREBLE, treble_table[treble]);
}