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/*
* Purpose: Multi channel playback support for devices with multiple stereo engines.
*
* Some sound cards don't provide single multi channel output engine. Instead
* they have multiple stereo output pairs connected to the front, side,
* center/LFE and rear speakers. The remux driver is used by such drivers to
* redistribute multi channel streams to the individual stereo engines.
*/
/*
*
* This file is part of Open Sound System.
*
* Copyright (C) 4Front Technologies 1996-2008.
*
* This this source file is released under GPL v2 license (no other versions).
* See the COPYING file included in the main directory of this source
* distribution for the license terms and conditions.
*
*/
#include "oss_config.h"
#ifndef USE_REMUX
#error remux.c is not compatible with this architecture (endianess)
#endif
#ifdef OSS_BIG_ENDIAN
void
remux_install (char *name, oss_device_t * osdev, int frontdev, int reardev,
int center_lfe_dev, int surrounddev)
{
/* Not compatible with big endian yet */
}
#else
#include "remux.h"
static char *chnames[MAX_SUBDEVS] = {
"Front",
"Surr",
"C&L",
"Rear"
};
static const int bindings[MAX_SUBDEVS] = {
DSP_BIND_FRONT,
DSP_BIND_SURR,
DSP_BIND_CENTER_LFE,
DSP_BIND_REAR
};
static remux_devc dev_info = { 0 }, *devc = &dev_info;
/*
* Audio routines
*/
/*ARGSUSED*/
static void
remux_callback (int dev, int parm)
{
oss_audio_outputintr (devc->audio_dev, 1);
}
static int
remux_set_rate (int dev, int arg)
{
remux_devc *devc = audio_engines[dev]->devc;
return devc->speed =
audio_engines[devc->physdev[0]]->d->adrv_set_rate (devc->physdev[0], arg);
}
static short
remux_set_channels (int dev, short arg)
{
remux_devc *devc = audio_engines[dev]->devc;
if (arg == 0)
return devc->channels;
arg &= ~1; /* Make sure we have even number of channels */
if (arg < 2)
return devc->channels = 2;
if (arg > devc->maxchannels)
return devc->channels = devc->maxchannels;
return devc->channels = arg;
}
/*ARGSUSED*/
static unsigned int
remux_set_format (int dev, unsigned int arg)
{
return AFMT_S16_NE;
}
/*ARGSUSED*/
static int
remux_ioctl (int dev, unsigned int cmd, ioctl_arg arg)
{
return OSS_EINVAL;
}
static void remux_trigger (int dev, int state);
static void
remux_reset (int dev)
{
remux_trigger (dev, 0);
}
/*ARGSUSED*/
static int
remux_open (int dev, int mode, int open_flags)
{
remux_devc *devc = audio_engines[dev]->devc;
adev_p adev = audio_engines[devc->audio_dev];
oss_native_word flags;
int i, j, err;
if (mode & OPEN_READ)
{
cmn_err (CE_WARN, "Audio device %d cannot do recording\n", dev);
/* return OSS_ENOTSUP; */
}
MUTEX_ENTER_IRQDISABLE (devc->mutex, flags);
if (devc->open_mode != 0)
{
MUTEX_EXIT_IRQRESTORE (devc->mutex, flags);
return OSS_EBUSY;
}
devc->open_mode = mode;
MUTEX_EXIT_IRQRESTORE (devc->mutex, flags);
for (i = 0; i < devc->n_physdevs; i++)
{
adev_p pdev = audio_engines[devc->physdev[i]];
devc->finfo[i].mode = OPEN_WRITE;
devc->finfo[i].acc_flags = 0;
if ((err =
oss_audio_open_engine (devc->physdev[i], OSS_DEV_DSP,
&devc->finfo[i], 1, OF_SMALLFRAGS,
NULL)) < 0)
{
for (j = 0; j < i; j++)
{
oss_audio_release (devc->physdev[j], &devc->finfo[j]);
}
devc->open_mode = 0;
return err;
}
strcpy (pdev->cmd, chnames[i]);
pdev->pid = 0;
pdev->cooked_enable = 0;
if (pdev->d->adrv_bind != NULL)
{
int b = bindings[i];
pdev->d->adrv_bind (pdev->engine_num, SNDCTL_DSP_BIND_CHANNEL,
(ioctl_arg) & b);
}
if (pdev->flags & ADEV_FIXEDRATE)
{
adev->flags |= ADEV_FIXEDRATE;
adev->fixed_rate = pdev->fixed_rate;
}
else
adev->flags &= ~(ADEV_FIXEDRATE);
}
devc->speed = 48000;
devc->channels = 2;
adev->cooked_enable = 0;
return 0;
}
/*ARGSUSED*/
static void
remux_close (int dev, int mode)
{
int i;
remux_devc *devc = audio_engines[dev]->devc;
for (i = 0; i < devc->n_physdevs; i++)
oss_audio_release (devc->physdev[i], &devc->finfo[i]);
devc->open_mode = 0;
}
#if 0
static int sinebuf[48] = {
0, 4276, 8480, 12539, 16383, 19947, 23169, 25995,
28377, 30272, 31650, 32486, 32767, 32486, 31650, 30272,
28377, 25995, 23169, 19947, 16383, 12539, 8480, 4276,
0, -4276, -8480, -12539, -16383, -19947, -23169, -25995,
-28377, -30272, -31650, -32486, -32767, -32486, -31650, -30272,
-28377, -25995, -23169, -19947, -16383, -12539, -8480, -4276
};
#endif
/*ARGSUSED*/
static void
remux_output_block (int dev, oss_native_word buf, int count,
int fragsize, int intrflag)
{
/*
* This routine does the actual de-interleaving of stereo pairs to the
* individual devices. All data movement is done based on sample pairs
* 2*16=32 bit (2*short=int). Native endianess (AFMT_S16_NE) is assumed.
*/
adev_p adev = audio_engines[dev], pdev = audio_engines[devc->physdev[0]];
remux_devc *devc = adev->devc;
dmap_p dmap = adev->dmap_out, pdmap = pdev->dmap_out;
int ch, nc, nf = pdmap->nfrags;
int *inbuf;
int ptr, pos = 0;
ptr = ((unsigned long) dmap->byte_counter) % dmap->bytes_in_use;
inbuf = (int *) (dmap->dmabuf + ptr);
nc = devc->channels / 2;
for (ch = 0; ch < nc; ch++)
{
int *outbuf;
int i, ns;
pdev = audio_engines[devc->physdev[ch]];
pdmap = pdev->dmap_out;
if (ch == 0)
pos =
(pdmap->user_counter + pdmap->fragment_size) % pdmap->bytes_in_use;
outbuf = (int *) (pdmap->dmabuf + pos);
ns = dmap->fragment_size / (4 * nc);
for (i = 0; i < ns; i++)
{
#if 0
static int p[MAX_SUBDEVS] = { 0 };
short *s = (short *) &outbuf[i];
s[0] = s[1] = sinebuf[p[ch]];
p[ch] = (p[ch] + 1) % 48;
#else
outbuf[i] = inbuf[(i * nc) + ch];
#endif
}
pdmap->user_counter += ns * 4;
}
if (pdmap->user_counter - pdmap->byte_counter <
pdmap->fragment_size * (nf / 2))
{
oss_audio_outputintr (devc->audio_dev, 1);
}
}
/*ARGSUSED*/
static void
remux_start_input (int dev, oss_native_word buf, int count,
int fragsize, int intrflag)
{
}
static void
remux_trigger (int dev, int state)
{
remux_devc *devc = audio_engines[dev]->devc;
int i;
for (i = 0; i < devc->n_physdevs; i++)
{
int pd = devc->physdev[i];
adev_p pdev = audio_engines[pd];
pdev->d->adrv_trigger (pd, state);
if (state & PCM_ENABLE_OUTPUT)
pdev->dmap_out->flags |= DMAP_STARTED;
else
pdev->dmap_out->flags &= ~DMAP_STARTED;
}
}
/*ARGSUSED*/
static int
remux_prepare_for_input (int dev, int bsize, int bcount)
{
return OSS_EIO;
}
static int
remux_prepare_for_output (int dev, int bsize, int bcount)
{
remux_devc *devc = audio_engines[dev]->devc;
adev_p adev = audio_engines[dev];
int i, err, tmp, nd;
oss_native_word flags;
MUTEX_ENTER_IRQDISABLE (devc->mutex, flags);
nd = devc->channels / 2;
bsize = 240; /* Must be divisible by 3*4 and 4*4 */
for (i = 0; i < devc->n_physdevs; i++)
{
int pd = devc->physdev[i];
adev_p pdev = audio_engines[pd];
dmap_p dmap = pdev->dmap_out;
tmp = pdev->d->adrv_set_format (pd, AFMT_S16_NE);
if (tmp != AFMT_S16_NE)
{
cmn_err (CE_NOTE, "remux: Bad sample format %x\n", tmp);
MUTEX_EXIT_IRQRESTORE (devc->mutex, flags);
return OSS_EIO;
}
tmp = pdev->d->adrv_set_channels (pd, 2);
if (tmp != 2)
{
cmn_err (CE_NOTE, "remux: Bad number of channels %d\n", tmp);
MUTEX_EXIT_IRQRESTORE (devc->mutex, flags);
return OSS_EIO;
}
tmp = pdev->d->adrv_set_rate (pd, devc->speed);
if (tmp != devc->speed)
{
cmn_err (CE_NOTE, "remux: Bad sample rate %d\n", tmp);
MUTEX_EXIT_IRQRESTORE (devc->mutex, flags);
return OSS_EIO;
}
if (pdev->min_block > 0 && bsize < pdev->min_block)
bsize = pdev->min_block;
if (pdev->max_block > 0 && bsize > pdev->max_block)
bsize = pdev->max_block;
dmap->fragment_size = bsize;
bcount = dmap->buffsize / bsize;
dmap->bytes_in_use = bcount * bsize;
dmap->nfrags = bcount;
if ((err = pdev->d->adrv_prepare_for_output (pd, bsize, bcount)) < 0)
{
cmn_err (CE_WARN,
"remux: Preparing device #%d failed, error %d\n", pd, err);
MUTEX_EXIT_IRQRESTORE (devc->mutex, flags);
return err;
}
if (dmap->dmabuf == NULL)
{
cmn_err (CE_WARN, "dmabuf==NULL\n");
MUTEX_EXIT_IRQRESTORE (devc->mutex, flags);
return OSS_ENOMEM;
}
memset (dmap->dmabuf, 0, dmap->buffsize);
if (i == 0)
dmap->audio_callback = remux_callback;
dmap->dma_mode = PCM_ENABLE_OUTPUT;
dmap->flags |= DMAP_PREPARED;
dmap->data_rate = devc->speed * 4;
}
adev->dmap_out->fragment_size = bsize * nd;
adev->dmap_out->nfrags =
adev->dmap_out->bytes_in_use / adev->dmap_out->fragment_size;
adev->dmap_out->nfrags &= ~1;
if (adev->dmap_out->nfrags < 2)
adev->dmap_out->nfrags = 2;
adev->dmap_out->bytes_in_use =
adev->dmap_out->fragment_size * adev->dmap_out->nfrags;
MUTEX_EXIT_IRQRESTORE (devc->mutex, flags);
return 0;
}
static audiodrv_t remux_driver = {
remux_open,
remux_close,
remux_output_block,
remux_start_input,
remux_ioctl,
remux_prepare_for_input,
remux_prepare_for_output,
remux_reset,
NULL,
NULL,
NULL,
NULL,
remux_trigger,
remux_set_rate,
remux_set_format,
remux_set_channels,
NULL,
NULL,
NULL,
NULL,
NULL, /* remux_alloc_buffer */
NULL, /* remux_free_buffer */
NULL,
NULL,
NULL
};
static int
check_physdev (int dev)
{
adev_p adev = audio_engines[dev];
if (!(adev->oformat_mask & AFMT_S16_NE))
{
cmn_err (CE_NOTE,
"remux: Audio device %d doesn't support the 16 bit format\n",
dev);
return 0;
}
if (adev->flags & (ADEV_NOOUTPUT))
{
cmn_err (CE_NOTE, "remux: Audio device %d doesn't support output\n",
dev);
return 0;
}
#if 0
if (!(adev->flags & ADEV_AUTOMODE))
{
cmn_err (CE_NOTE, "remux: Audio device %d doesn't support auto-mode\n",
dev);
return 0;
}
#endif
return 1;
}
static int
countdevs (int frontdev, int reardev, int center_lfe_dev, int surrounddev)
{
if (frontdev < 0 || frontdev >= num_audio_engines)
return 0;
if (reardev < 0 || reardev >= num_audio_engines)
return 2;
if (center_lfe_dev < 0 || center_lfe_dev >= num_audio_engines)
return 4;
if (surrounddev < 0 || surrounddev >= num_audio_engines)
return 6;
return 8;
}
void
remux_install (char *name, oss_device_t * osdev, int frontdev, int reardev,
int center_lfe_dev, int surrounddev)
{
adev_p adev, pdev;
int n, i;
DDB (cmn_err (CE_CONT, "remux install %s: %d, %d, %d, %d\n",
name, frontdev, reardev, center_lfe_dev, surrounddev));
devc->osdev = osdev;
MUTEX_INIT (devc->osdev, devc->mutex, MH_DRV + 2);
n = countdevs (frontdev, reardev, center_lfe_dev, surrounddev);
if (n < 4)
{
cmn_err (CE_WARN, "remux: Bad devices (%d, %d, %d, %d)\n",
frontdev, reardev, center_lfe_dev, surrounddev);
return;
}
devc->maxchannels = n;
devc->n_physdevs = n / 2;
devc->physdev[0] = frontdev;
devc->physdev[1] = reardev;
devc->physdev[2] = center_lfe_dev;
devc->physdev[3] = surrounddev;
for (i = 0; i < devc->n_physdevs; i++)
if (!check_physdev (devc->physdev[i]))
return;
pdev = audio_engines[frontdev];
if ((devc->audio_dev = oss_install_audiodev (OSS_AUDIO_DRIVER_VERSION,
devc->osdev,
devc->osdev,
name,
&remux_driver,
sizeof (audiodrv_t),
ADEV_NOINPUT | ADEV_SPECIAL |
ADEV_DISABLE_VIRTUAL |
ADEV_NOSRC, AFMT_S16_NE, devc,
-1)) < 0)
{
devc->audio_dev = -1;
return;
}
adev = audio_engines[devc->audio_dev];
adev->devc = devc;
adev->min_channels = 2;
adev->max_channels = devc->maxchannels;
adev->min_rate = pdev->min_rate;
adev->max_rate = pdev->max_rate;
adev->rate_source = frontdev;
adev->caps |= DSP_CH_MULTI;
if (pdev->caps & PCM_CAP_FREERATE)
adev->caps |= PCM_CAP_FREERATE;
devc->open_mode = 0;
}
#endif
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