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Faster start of playback when Play/Next/Prev

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@2677 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Linus Nielsen Feltzing 2002-10-16 09:26:03 +00:00
parent fae212043b
commit 647db26fe8
1 changed files with 10 additions and 10 deletions
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20
firmware/mpeg.c
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@ -845,14 +845,19 @@ static void swap_one_chunk(void)
{ {
int free_space_left; int free_space_left;
int amount_to_swap; int amount_to_swap;
int t1, t2;
free_space_left = get_unswapped_space(); free_space_left = get_unswapped_space();
if(free_space_left == 0 && !play_pending) if(free_space_left == 0 && !play_pending)
return; return;
amount_to_swap = MIN(MPEG_SWAP_CHUNKSIZE, free_space_left); /* Swap in larger chunks when the user is waiting for the playback
to start */
if(play_pending)
amount_to_swap = MIN(MPEG_LOW_WATER_CHUNKSIZE, free_space_left);
else
amount_to_swap = MIN(MPEG_SWAP_CHUNKSIZE, free_space_left);
if(mp3buf_write < mp3buf_swapwrite) if(mp3buf_write < mp3buf_swapwrite)
amount_to_swap = MIN(mp3buflen - mp3buf_swapwrite, amount_to_swap = MIN(mp3buflen - mp3buf_swapwrite,
amount_to_swap); amount_to_swap);
@ -860,17 +865,12 @@ static void swap_one_chunk(void)
amount_to_swap = MIN(mp3buf_write - mp3buf_swapwrite, amount_to_swap = MIN(mp3buf_write - mp3buf_swapwrite,
amount_to_swap); amount_to_swap);
DEBUGF("B %x\n", amount_to_swap);
t1 = current_tick;
bitswap(mp3buf + mp3buf_swapwrite, amount_to_swap); bitswap(mp3buf + mp3buf_swapwrite, amount_to_swap);
t2 = current_tick;
DEBUGF("time: %d\n", t2 - t1);
mp3buf_swapwrite += amount_to_swap; mp3buf_swapwrite += amount_to_swap;
if(mp3buf_swapwrite >= mp3buflen) if(mp3buf_swapwrite >= mp3buflen)
{ {
mp3buf_swapwrite = 0; mp3buf_swapwrite = 0;
DEBUGF("BW\n");
} }
/* And while we're at it, see if we have started /* And while we're at it, see if we have started
@ -919,8 +919,6 @@ static void mpeg_thread(void)
while(1) while(1)
{ {
DEBUGF("S R:%x W:%x SW:%x\n",
mp3buf_read, mp3buf_write, mp3buf_swapwrite);
yield(); yield();
/* Swap if necessary, and don't block on the queue_wait() */ /* Swap if necessary, and don't block on the queue_wait() */
@ -931,6 +929,8 @@ static void mpeg_thread(void)
} }
else else
{ {
DEBUGF("S R:%x W:%x SW:%x\n",
mp3buf_read, mp3buf_write, mp3buf_swapwrite);
queue_wait(&mpeg_queue, &ev); queue_wait(&mpeg_queue, &ev);
} }