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oss: OSS v4 support 

a. Use SNDCTL_DSP_POLICY instead of SNDCTL_DSP_SETFRAGMENT
b. Add ability to open device in exclusive mode, thus bypassing vmix

Signed-off-by: malc <av1474@comtv.ru>
This commit is contained in:
malc 2009-09-13 08:17:47 +04:00
parent 2305411129
commit 0b3652bc70
1 changed files with 50 additions and 9 deletions
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59
audio/ossaudio.c
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@ -64,13 +64,17 @@ static struct {
const char *devpath_out;
const char *devpath_in;
int debug;
int exclusive;
int policy;
} conf = {
.try_mmap = 0,
.nfrags = 4,
.fragsize = 4096,
.devpath_out = "/dev/dsp",
.devpath_in = "/dev/dsp",
.debug = 0
.debug = 0,
.exclusive = 0,
.policy = 5
};
struct oss_params {
@ -234,15 +238,16 @@ static int oss_open (int in, struct oss_params *req,
struct oss_params *obt, int *pfd)
{
int fd;
int oflags;
int mmmmssss;
int version;
int oflags = conf.exclusive ? O_EXCL : 0;
audio_buf_info abinfo;
int fmt, freq, nchannels;
const char *dspname = in ? conf.devpath_in : conf.devpath_out;
const char *typ = in ? "ADC" : "DAC";
/* Kludge needed to have working mmap on Linux */
oflags = conf.try_mmap ? O_RDWR : (in ? O_RDONLY : O_WRONLY);
oflags |= conf.try_mmap ? O_RDWR : (in ? O_RDONLY : O_WRONLY);
fd = open (dspname, oflags | O_NONBLOCK);
if (-1 == fd) {
oss_logerr2 (errno, typ, "Failed to open `%s'\n", dspname);
@ -274,11 +279,33 @@ static int oss_open (int in, struct oss_params *req,
goto err;
}
mmmmssss = (req->nfrags << 16) | ctz32 (req->fragsize);
if (ioctl (fd, SNDCTL_DSP_SETFRAGMENT, &mmmmssss)) {
oss_logerr2 (errno, typ, "Failed to set buffer length (%d, %d)\n",
req->nfrags, req->fragsize);
goto err;
if (ioctl (fd, OSS_GETVERSION, &version)) {
oss_logerr2 (errno, typ, "Failed to get OSS version\n");
version = 0;
}
if (conf.debug) {
dolog ("OSS version = %#x\n", version);
}
#ifdef SNDCTL_DSP_POLICY
if (conf.policy >= 0 && version >= 0x040000) {
int policy = conf.policy;
if (ioctl (fd, SNDCTL_DSP_POLICY, &policy)) {
oss_logerr2 (errno, typ, "Failed to set timing policy to %d\n",
conf.policy);
goto err;
}
}
else
#endif
{
int mmmmssss = (req->nfrags << 16) | ctz32 (req->fragsize);
if (ioctl (fd, SNDCTL_DSP_SETFRAGMENT, &mmmmssss)) {
oss_logerr2 (errno, typ, "Failed to set buffer length (%d, %d)\n",
req->nfrags, req->fragsize);
goto err;
}
}
if (ioctl (fd, in ? SNDCTL_DSP_GETISPACE : SNDCTL_DSP_GETOSPACE, &abinfo)) {
@ -839,6 +866,20 @@ static struct audio_option oss_options[] = {
.valp = &conf.devpath_in,
.descr = "Path to ADC device"
},
{
.name = "EXCLUSIVE",
.tag = AUD_OPT_BOOL,
.valp = &conf.exclusive,
.descr = "Open device in exclusive mode (vmix wont work)"
},
#ifdef SNDCTL_DSP_POLICY
{
.name = "POLICY",
.tag = AUD_OPT_INT,
.valp = &conf.policy,
.descr = "Set the timing policy of the device, -1 to use fragment mode",
},
#endif
{
.name = "DEBUG",
.tag = AUD_OPT_BOOL,