Nyaaori/rockbox
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

New version of the DMA underrun handling

Browse source 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@2547 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Linus Nielsen Feltzing 2002-10-09 13:25:03 +00:00
parent 2bfd326fc9
commit 33060d00c2
1 changed files with 17 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

29
firmware/mpeg.c
View file

@ -54,7 +54,6 @@ extern void bitswap(unsigned char *data, int length);
#define MPEG_NEED_DATA 100
#define MPEG_SWAP_DATA 101
#define MPEG_TRACK_CHANGE 102
#define MPEG_DMA_UNDERRUN 103
extern char* playlist_peek(int steps);
extern int playlist_next(int steps);
@ -434,6 +433,8 @@ static bool playing; /* We are playing an MP3 stream */
static bool play_pending; /* We are about to start playing */
static bool is_playing; /* We are (attempting to) playing MP3 files */
static bool filling; /* We are filling the buffer with data from disk */
static bool dma_underrun; /* True when the DMA has stopped because of
slow disk reading (read error, shaking) */
static int mpeg_file;
@ -490,7 +491,7 @@ static int dbg_cnt2us(unsigned int cnt)
}
#endif
static int get_unplayed_space(void)
int get_unplayed_space(void)
{
int space = mp3buf_write - mp3buf_read;
if (space < 0)
@ -537,6 +538,7 @@ static void init_dma(void)
DTCR3 = last_dma_chunk_size & 0xffff;
DMAOR = 0x0001; /* Enable DMA */
CHCR3 |= 0x0001; /* Enable DMA IRQ */
dma_underrun = false;
}
static void start_dma(void)
@ -639,13 +641,19 @@ void DEI3(void)
}
else
{
DEBUGF("No more MP3 data. Stopping.\n");
/* Check if the end of data is because of a hard disk error */
if(filling)
queue_post(&mpeg_queue, MPEG_DMA_UNDERRUN, 0);
/* Check if the end of data is because of a hard disk error.
If there is an open file handle, we are still playing music.
If not, the last file has been loaded, and the file handle is
closed. */
if(mpeg_file >= 0)
{
DEBUGF("DMA underrun.\n");
dma_underrun = true;
}
else
{
DEBUGF("No more MP3 data. Stopping.\n");
queue_post(&mpeg_queue, MPEG_TRACK_CHANGE, 0);
playing = false;
is_playing = false;
@ -1239,7 +1247,7 @@ static void mpeg_thread(void)
/* And while we're at it, see if we have started
playing yet. If not, do it. */
if(play_pending)
if(play_pending || dma_underrun)
{
/* If the filling has stopped, and we still haven't reached
the watermark, the file must be smaller than the
@ -1305,6 +1313,7 @@ static void mpeg_thread(void)
DEBUGF("R\n");
t1 = current_tick;
len = read(mpeg_file, mp3buf+mp3buf_write, amount_to_read);
if(len > 0)
{
t2 = current_tick;
@ -1365,10 +1374,6 @@ static void mpeg_thread(void)
track_change();
break;
case MPEG_DMA_UNDERRUN:
CHCR3 |= 0x0001; /* Enable the DMA interrupt */
break;
case SYS_USB_CONNECTED:
stop_playing();
#ifndef SIMULATOR