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Diffstat (limited to 'pd/src/s_audio_oss.c')
-rw-r--r--pd/src/s_audio_oss.c110
1 files changed, 71 insertions, 39 deletions
diff --git a/pd/src/s_audio_oss.c b/pd/src/s_audio_oss.c
index 382e6a75..b612b458 100644
--- a/pd/src/s_audio_oss.c
+++ b/pd/src/s_audio_oss.c
@@ -78,25 +78,37 @@ static char ossdsp[] = "/dev/dsp%d";
#define FMAX 0x7ffff000
#define CLIP32(x) (((x)>FMAX)?FMAX:((x) < -FMAX)?-FMAX:(x))
+/* ---------------- public routines ----------------------- */
-/* ------------- private routines for all APIS ------------------- */
+static int oss_ndev = 0;
-static void linux_flush_all_underflows_to_zero(void)
+ /* find out how many OSS devices we have. Since this has to
+ open the devices to find out if they're there, we have
+ to be called before audio is actually started up. So we
+ cache the results, which in effect are the number of available
+ devices. */
+void oss_init(void)
{
-/*
- TODO: Implement similar thing for linux (GGeiger)
-
- One day we will figure this out, I hope, because it
- costs CPU time dearly on Intel - LT
- */
- /* union fpc_csr f;
- f.fc_word = get_fpc_csr();
- f.fc_struct.flush = 1;
- set_fpc_csr(f.fc_word);
- */
+ int fd, i;
+ static int countedthem = 0;
+ if (countedthem)
+ return;
+ for (i = 0; i < 10; i++)
+ {
+ char devname[100];
+ if (i == 0)
+ strcpy(devname, "/dev/dsp");
+ else sprintf(devname, "/dev/dsp%d", i);
+ if ( (fd = open(devname, O_WRONLY|O_NONBLOCK)) != -1)
+ {
+ oss_ndev++;
+ close(fd);
+ }
+ else break;
+ }
+ countedthem = 1;
}
-
void oss_set32bit( void)
{
oss_32bit = 1;
@@ -172,11 +184,12 @@ void oss_configure(t_oss_dev *dev, int srate, int dac, int skipblocksize)
{
int fragbytes, logfragsize, nfragment;
/* setting fragment count and size. */
+ linux_fragsize = sys_blocksize;
if (!linux_fragsize)
{
linux_fragsize = OSS_DEFFRAGSIZE;
while (linux_fragsize > DEFDACBLKSIZE
- && linux_fragsize * 4 > sys_advance_samples)
+ && linux_fragsize * 6 > sys_advance_samples)
linux_fragsize = linux_fragsize/2;
}
/* post("adv_samples %d", sys_advance_samples); */
@@ -239,14 +252,14 @@ static int oss_setchannels(int fd, int wantchannels, char *devname)
{ /* IOhannes */
int param = wantchannels;
- while (param>1) {
- int save = param;
- if (ioctl(fd, SNDCTL_DSP_CHANNELS, &param) == -1) {
- error("OSS: SNDCTL_DSP_CHANNELS failed %s",devname);
- } else {
- if (param == save) return (param);
- }
- param=save-1;
+ while (param > 1)
+ {
+ int save = param;
+ if (ioctl(fd, SNDCTL_DSP_CHANNELS, &param) == -1)
+ error("OSS: SNDCTL_DSP_CHANNELS failed %s",devname);
+ else if (param == save)
+ return (param);
+ param = save - 1;
}
return (0);
@@ -268,11 +281,9 @@ int oss_open_audio(int nindev, int *indev, int nchin, int *chin,
audio_buf_info ainfo;
linux_nindevs = linux_noutdevs = 0;
-
-
- /* mark input devices unopened */
+ /* mark devices unopened */
for (i = 0; i < OSS_MAXDEV; i++)
- linux_adcs[i].d_fd = -1;
+ linux_adcs[i].d_fd = linux_dacs[i].d_fd = -1;
/* open output devices */
wantmore=0;
@@ -282,16 +293,15 @@ int oss_open_audio(int nindev, int *indev, int nchin, int *chin,
for (n = 0; n < noutdev; n++)
{
int gotchans, j, inindex = -1;
- int thisdevice = (outdev[n] >= 0 ? outdev[n] : n-1);
+ int thisdevice = (outdev[n] >= 0 ? outdev[n] : 0);
int wantchannels = (nchout>n) ? chout[n] : wantmore;
fd = -1;
if (!wantchannels)
goto end_out_loop;
- if (thisdevice > 1)
- sprintf(devname, "/dev/dsp%d", thisdevice-1);
+ if (thisdevice > 0)
+ sprintf(devname, "/dev/dsp%d", thisdevice);
else sprintf(devname, "/dev/dsp");
-
/* search for input request for same device. Succeed only
if the number of channels matches. */
for (j = 0; j < nindev; j++)
@@ -369,14 +379,14 @@ int oss_open_audio(int nindev, int *indev, int nchin, int *chin,
for (n = 0; n < nindev; n++)
{
int gotchans=0;
- int thisdevice = (indev[n] >= 0 ? indev[n] : n-1);
+ int thisdevice = (indev[n] >= 0 ? indev[n] : 0);
int wantchannels = (nchin>n)?chin[n]:wantmore;
int alreadyopened = 0;
if (!wantchannels)
goto end_in_loop;
- if (thisdevice > 1)
- sprintf(devname, "/dev/dsp%d", thisdevice - 1);
+ if (thisdevice > 0)
+ sprintf(devname, "/dev/dsp%d", thisdevice);
else sprintf(devname, "/dev/dsp");
sys_setalarm(1000000);
@@ -399,12 +409,13 @@ int oss_open_audio(int nindev, int *indev, int nchin, int *chin,
post("opened %s for reading only\n", devname);
}
linux_adcs[linux_nindevs].d_fd = fd;
+
gotchans = oss_setchannels(fd,
(wantchannels>OSS_MAXCHPERDEV)?OSS_MAXCHPERDEV:wantchannels,
devname);
if (sys_verbose)
- post("opened audio input device %s; got %d channels",
- devname, gotchans);
+ post("opened audio input device %s; got %d channels",
+ devname, gotchans);
if (gotchans < 1)
{
@@ -442,6 +453,17 @@ int oss_open_audio(int nindev, int *indev, int nchin, int *chin,
if (sys_verbose)
fprintf(stderr, "...done.\n");
}
+ /* now go and fill all the output buffers. */
+ for (i = 0; i < linux_noutdevs; i++)
+ {
+ int j;
+ memset(buf, 0, linux_dacs[i].d_bytespersamp *
+ linux_dacs[i].d_nchannels * DEFDACBLKSIZE);
+ for (j = 0; j < sys_advance_samples/DEFDACBLKSIZE; j++)
+ write(linux_dacs[i].d_fd, buf,
+ linux_dacs[i].d_bytespersamp *
+ linux_dacs[i].d_nchannels * DEFDACBLKSIZE);
+ }
sys_setalarm(0);
return (0);
}
@@ -765,8 +787,18 @@ int oss_send_dacs(void)
return (rtnval);
}
-void oss_listdevs( void)
+void oss_getdevs(char *indevlist, int *nindevs,
+ char *outdevlist, int *noutdevs, int *canmulti,
+ int maxndev, int devdescsize)
{
- post("device listing not implemented in OSS yet\n");
+ int i, ndev;
+ *canmulti = 2; /* supports multiple devices */
+ if ((ndev = oss_ndev) > maxndev)
+ ndev = maxndev;
+ for (i = 0; i < ndev; i++)
+ {
+ sprintf(indevlist + i * devdescsize, "OSS device #%d", i+1);
+ sprintf(outdevlist + i * devdescsize, "OSS device #%d", i+1);
+ }
+ *nindevs = *noutdevs = ndev;
}
-
generated by cgit v1.2.1 (git 2.18.0) at 2024-06-29 13:48:50 +0000