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don't erase info in sndbuf_setup()

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set free'd pointers to NULL in sndbuf_free()
add a new function
This commit is contained in:
Cameron Grant 2001-05-27 14:39:34 +00:00
parent 58e7e3b406
commit fc60109d91
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=77265
2 changed files with 24 additions and 6 deletions
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29
sys/dev/sound/pcm/buffer.c
View File

@ -100,7 +100,6 @@ sndbuf_alloc(struct snd_dbuf *b, bus_dma_tag_t dmatag, unsigned int size)
int
sndbuf_setup(struct snd_dbuf *b, void *buf, unsigned int size)
{
bzero(b, sizeof(*b));
b->buf = buf;
b->maxsize = size;
b->bufsize = b->maxsize;
@ -119,6 +118,8 @@ sndbuf_free(struct snd_dbuf *b)
if (b->dmamap && b->buf)
bus_dmamem_free(b->dmatag, b->buf, b->dmamap);
b->dmamap = NULL;
b->buf = NULL;
}
int
@ -186,11 +187,6 @@ sndbuf_clear(struct snd_dbuf *b, unsigned int length)
else
data = 0x80;
if (b->fmt & AFMT_16BIT)
data <<= 8;
else
data |= data << 8;
i = sndbuf_getfreeptr(b);
p = sndbuf_getbuf(b);
while (length > 0) {
@ -202,6 +198,25 @@ sndbuf_clear(struct snd_dbuf *b, unsigned int length)
}
}
void
sndbuf_fillsilence(struct snd_dbuf *b)
{
int i;
u_char data, *p;
if (b->fmt & AFMT_SIGNED)
data = 0x00;
else
data = 0x80;
i = 0;
p = sndbuf_getbuf(b);
while (i < b->bufsize)
p[i++] = data;
b->rp = 0;
b->rl = b->bufsize;
}
void
sndbuf_reset(struct snd_dbuf *b)
{
@ -510,6 +525,8 @@ sndbuf_uiomove(struct snd_dbuf *b, struct uio *uio, unsigned int count)
int
sndbuf_feed(struct snd_dbuf *from, struct snd_dbuf *to, struct pcm_channel *channel, struct pcm_feeder *feeder, unsigned int count)
{
KASSERT(count > 0, ("can't feed 0 bytes"));
if (sndbuf_getfree(to) < count)
return EINVAL;

1
sys/dev/sound/pcm/buffer.h
View File

@ -45,6 +45,7 @@ int sndbuf_resize(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz);
int sndbuf_remalloc(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz);
void sndbuf_reset(struct snd_dbuf *b);
void sndbuf_clear(struct snd_dbuf *b, unsigned int length);
void sndbuf_fillsilence(struct snd_dbuf *b);
u_int32_t sndbuf_getfmt(struct snd_dbuf *b);
int sndbuf_setfmt(struct snd_dbuf *b, u_int32_t fmt);