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pcm_oss.c
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pcm_oss.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Digital Audio (PCM) abstract layer / OSS compatible
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
*/
#if 0
#define PLUGIN_DEBUG
#endif
#if 0
#define OSS_DEBUG
#endif
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/sched/signal.h>
#include <linux/time.h>
#include <linux/vmalloc.h>
#include <linux/module.h>
#include <linux/math64.h>
#include <linux/string.h>
#include <linux/compat.h>
#include <sound/core.h>
#include <sound/minors.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include "pcm_plugin.h"
#include <sound/info.h>
#include <linux/soundcard.h>
#include <sound/initval.h>
#include <sound/mixer_oss.h>
#define OSS_ALSAEMULVER _SIOR ('M', 249, int)
static int dsp_map[SNDRV_CARDS];
static int adsp_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
static bool nonblock_open = 1;
MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
MODULE_DESCRIPTION("PCM OSS emulation for ALSA.");
MODULE_LICENSE("GPL");
module_param_array(dsp_map, int, NULL, 0444);
MODULE_PARM_DESC(dsp_map, "PCM device number assigned to 1st OSS device.");
module_param_array(adsp_map, int, NULL, 0444);
MODULE_PARM_DESC(adsp_map, "PCM device number assigned to 2nd OSS device.");
module_param(nonblock_open, bool, 0644);
MODULE_PARM_DESC(nonblock_open, "Don't block opening busy PCM devices.");
MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM);
MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM1);
static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file);
static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file);
static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file);
/*
* helper functions to process hw_params
*/
static int snd_interval_refine_min(struct snd_interval *i, unsigned int min, int openmin)
{
int changed = 0;
if (i->min < min) {
i->min = min;
i->openmin = openmin;
changed = 1;
} else if (i->min == min && !i->openmin && openmin) {
i->openmin = 1;
changed = 1;
}
if (i->integer) {
if (i->openmin) {
i->min++;
i->openmin = 0;
}
}
if (snd_interval_checkempty(i)) {
snd_interval_none(i);
return -EINVAL;
}
return changed;
}
static int snd_interval_refine_max(struct snd_interval *i, unsigned int max, int openmax)
{
int changed = 0;
if (i->max > max) {
i->max = max;
i->openmax = openmax;
changed = 1;
} else if (i->max == max && !i->openmax && openmax) {
i->openmax = 1;
changed = 1;
}
if (i->integer) {
if (i->openmax) {
i->max--;
i->openmax = 0;
}
}
if (snd_interval_checkempty(i)) {
snd_interval_none(i);
return -EINVAL;
}
return changed;
}
static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
{
struct snd_interval t;
t.empty = 0;
t.min = t.max = val;
t.openmin = t.openmax = 0;
t.integer = 1;
return snd_interval_refine(i, &t);
}
/**
* snd_pcm_hw_param_value_min
* @params: the hw_params instance
* @var: parameter to retrieve
* @dir: pointer to the direction (-1,0,1) or NULL
*
* Return the minimum value for field PAR.
*/
static unsigned int
snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var, int *dir)
{
if (hw_is_mask(var)) {
if (dir)
*dir = 0;
return snd_mask_min(hw_param_mask_c(params, var));
}
if (hw_is_interval(var)) {
const struct snd_interval *i = hw_param_interval_c(params, var);
if (dir)
*dir = i->openmin;
return snd_interval_min(i);
}
return -EINVAL;
}
/**
* snd_pcm_hw_param_value_max
* @params: the hw_params instance
* @var: parameter to retrieve
* @dir: pointer to the direction (-1,0,1) or NULL
*
* Return the maximum value for field PAR.
*/
static unsigned int
snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var, int *dir)
{
if (hw_is_mask(var)) {
if (dir)
*dir = 0;
return snd_mask_max(hw_param_mask_c(params, var));
}
if (hw_is_interval(var)) {
const struct snd_interval *i = hw_param_interval_c(params, var);
if (dir)
*dir = - (int) i->openmax;
return snd_interval_max(i);
}
return -EINVAL;
}
static int _snd_pcm_hw_param_mask(struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var,
const struct snd_mask *val)
{
int changed;
changed = snd_mask_refine(hw_param_mask(params, var), val);
if (changed > 0) {
params->cmask |= 1 << var;
params->rmask |= 1 << var;
}
return changed;
}
static int snd_pcm_hw_param_mask(struct snd_pcm_substream *pcm,
struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var,
const struct snd_mask *val)
{
int changed = _snd_pcm_hw_param_mask(params, var, val);
if (changed < 0)
return changed;
if (params->rmask) {
int err = snd_pcm_hw_refine(pcm, params);
if (err < 0)
return err;
}
return 0;
}
static int _snd_pcm_hw_param_min(struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var, unsigned int val,
int dir)
{
int changed;
int open = 0;
if (dir) {
if (dir > 0) {
open = 1;
} else if (dir < 0) {
if (val > 0) {
open = 1;
val--;
}
}
}
if (hw_is_mask(var))
changed = snd_mask_refine_min(hw_param_mask(params, var),
val + !!open);
else if (hw_is_interval(var))
changed = snd_interval_refine_min(hw_param_interval(params, var),
val, open);
else
return -EINVAL;
if (changed > 0) {
params->cmask |= 1 << var;
params->rmask |= 1 << var;
}
return changed;
}
/**
* snd_pcm_hw_param_min
* @pcm: PCM instance
* @params: the hw_params instance
* @var: parameter to retrieve
* @val: minimal value
* @dir: pointer to the direction (-1,0,1) or NULL
*
* Inside configuration space defined by PARAMS remove from PAR all
* values < VAL. Reduce configuration space accordingly.
* Return new minimum or -EINVAL if the configuration space is empty
*/
static int snd_pcm_hw_param_min(struct snd_pcm_substream *pcm,
struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var, unsigned int val,
int *dir)
{
int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0);
if (changed < 0)
return changed;
if (params->rmask) {
int err = snd_pcm_hw_refine(pcm, params);
if (err < 0)
return err;
}
return snd_pcm_hw_param_value_min(params, var, dir);
}
static int _snd_pcm_hw_param_max(struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var, unsigned int val,
int dir)
{
int changed;
int open = 0;
if (dir) {
if (dir < 0) {
open = 1;
} else if (dir > 0) {
open = 1;
val++;
}
}
if (hw_is_mask(var)) {
if (val == 0 && open) {
snd_mask_none(hw_param_mask(params, var));
changed = -EINVAL;
} else
changed = snd_mask_refine_max(hw_param_mask(params, var),
val - !!open);
} else if (hw_is_interval(var))
changed = snd_interval_refine_max(hw_param_interval(params, var),
val, open);
else
return -EINVAL;
if (changed > 0) {
params->cmask |= 1 << var;
params->rmask |= 1 << var;
}
return changed;
}
/**
* snd_pcm_hw_param_max
* @pcm: PCM instance
* @params: the hw_params instance
* @var: parameter to retrieve
* @val: maximal value
* @dir: pointer to the direction (-1,0,1) or NULL
*
* Inside configuration space defined by PARAMS remove from PAR all
* values >= VAL + 1. Reduce configuration space accordingly.
* Return new maximum or -EINVAL if the configuration space is empty
*/
static int snd_pcm_hw_param_max(struct snd_pcm_substream *pcm,
struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var, unsigned int val,
int *dir)
{
int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0);
if (changed < 0)
return changed;
if (params->rmask) {
int err = snd_pcm_hw_refine(pcm, params);
if (err < 0)
return err;
}
return snd_pcm_hw_param_value_max(params, var, dir);
}
static int boundary_sub(int a, int adir,
int b, int bdir,
int *c, int *cdir)
{
adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
*c = a - b;
*cdir = adir - bdir;
if (*cdir == -2) {
(*c)--;
} else if (*cdir == 2) {
(*c)++;
}
return 0;
}
static int boundary_lt(unsigned int a, int adir,
unsigned int b, int bdir)
{
if (adir < 0) {
a--;
adir = 1;
} else if (adir > 0)
adir = 1;
if (bdir < 0) {
b--;
bdir = 1;
} else if (bdir > 0)
bdir = 1;
return a < b || (a == b && adir < bdir);
}
/* Return 1 if min is nearer to best than max */
static int boundary_nearer(int min, int mindir,
int best, int bestdir,
int max, int maxdir)
{
int dmin, dmindir;
int dmax, dmaxdir;
boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
return boundary_lt(dmin, dmindir, dmax, dmaxdir);
}
/**
* snd_pcm_hw_param_near
* @pcm: PCM instance
* @params: the hw_params instance
* @var: parameter to retrieve
* @best: value to set
* @dir: pointer to the direction (-1,0,1) or NULL
*
* Inside configuration space defined by PARAMS set PAR to the available value
* nearest to VAL. Reduce configuration space accordingly.
* This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
* SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
* Return the value found.
*/
static int snd_pcm_hw_param_near(struct snd_pcm_substream *pcm,
struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var, unsigned int best,
int *dir)
{
struct snd_pcm_hw_params *save = NULL;
int v;
unsigned int saved_min;
int last = 0;
int min, max;
int mindir, maxdir;
int valdir = dir ? *dir : 0;
/* FIXME */
if (best > INT_MAX)
best = INT_MAX;
min = max = best;
mindir = maxdir = valdir;
if (maxdir > 0)
maxdir = 0;
else if (maxdir == 0)
maxdir = -1;
else {
maxdir = 1;
max--;
}
save = kmalloc(sizeof(*save), GFP_KERNEL);
if (save == NULL)
return -ENOMEM;
*save = *params;
saved_min = min;
min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
if (min >= 0) {
struct snd_pcm_hw_params *params1;
if (max < 0)
goto _end;
if ((unsigned int)min == saved_min && mindir == valdir)
goto _end;
params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
if (params1 == NULL) {
kfree(save);
return -ENOMEM;
}
*params1 = *save;
max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
if (max < 0) {
kfree(params1);
goto _end;
}
if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
*params = *params1;
last = 1;
}
kfree(params1);
} else {
*params = *save;
max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);
if (max < 0) {
kfree(save);
return max;
}
last = 1;
}
_end:
kfree(save);
if (last)
v = snd_pcm_hw_param_last(pcm, params, var, dir);
else
v = snd_pcm_hw_param_first(pcm, params, var, dir);
return v;
}
static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var, unsigned int val,
int dir)
{
int changed;
if (hw_is_mask(var)) {
struct snd_mask *m = hw_param_mask(params, var);
if (val == 0 && dir < 0) {
changed = -EINVAL;
snd_mask_none(m);
} else {
if (dir > 0)
val++;
else if (dir < 0)
val--;
changed = snd_mask_refine_set(hw_param_mask(params, var), val);
}
} else if (hw_is_interval(var)) {
struct snd_interval *i = hw_param_interval(params, var);
if (val == 0 && dir < 0) {
changed = -EINVAL;
snd_interval_none(i);
} else if (dir == 0)
changed = snd_interval_refine_set(i, val);
else {
struct snd_interval t;
t.openmin = 1;
t.openmax = 1;
t.empty = 0;
t.integer = 0;
if (dir < 0) {
t.min = val - 1;
t.max = val;
} else {
t.min = val;
t.max = val+1;
}
changed = snd_interval_refine(i, &t);
}
} else
return -EINVAL;
if (changed > 0) {
params->cmask |= 1 << var;
params->rmask |= 1 << var;
}
return changed;
}
/**
* snd_pcm_hw_param_set
* @pcm: PCM instance
* @params: the hw_params instance
* @var: parameter to retrieve
* @val: value to set
* @dir: pointer to the direction (-1,0,1) or NULL
*
* Inside configuration space defined by PARAMS remove from PAR all
* values != VAL. Reduce configuration space accordingly.
* Return VAL or -EINVAL if the configuration space is empty
*/
static int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm,
struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var, unsigned int val,
int dir)
{
int changed = _snd_pcm_hw_param_set(params, var, val, dir);
if (changed < 0)
return changed;
if (params->rmask) {
int err = snd_pcm_hw_refine(pcm, params);
if (err < 0)
return err;
}
return snd_pcm_hw_param_value(params, var, NULL);
}
static int _snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var)
{
int changed;
changed = snd_interval_setinteger(hw_param_interval(params, var));
if (changed > 0) {
params->cmask |= 1 << var;
params->rmask |= 1 << var;
}
return changed;
}
/*
* plugin
*/
#ifdef CONFIG_SND_PCM_OSS_PLUGINS
static int snd_pcm_oss_plugin_clear(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_pcm_plugin *plugin, *next;
plugin = runtime->oss.plugin_first;
while (plugin) {
next = plugin->next;
snd_pcm_plugin_free(plugin);
plugin = next;
}
runtime->oss.plugin_first = runtime->oss.plugin_last = NULL;
return 0;
}
static int snd_pcm_plugin_insert(struct snd_pcm_plugin *plugin)
{
struct snd_pcm_runtime *runtime = plugin->plug->runtime;
plugin->next = runtime->oss.plugin_first;
plugin->prev = NULL;
if (runtime->oss.plugin_first) {
runtime->oss.plugin_first->prev = plugin;
runtime->oss.plugin_first = plugin;
} else {
runtime->oss.plugin_last =
runtime->oss.plugin_first = plugin;
}
return 0;
}
int snd_pcm_plugin_append(struct snd_pcm_plugin *plugin)
{
struct snd_pcm_runtime *runtime = plugin->plug->runtime;
plugin->next = NULL;
plugin->prev = runtime->oss.plugin_last;
if (runtime->oss.plugin_last) {
runtime->oss.plugin_last->next = plugin;
runtime->oss.plugin_last = plugin;
} else {
runtime->oss.plugin_last =
runtime->oss.plugin_first = plugin;
}
return 0;
}
#endif /* CONFIG_SND_PCM_OSS_PLUGINS */
static long snd_pcm_oss_bytes(struct snd_pcm_substream *substream, long frames)
{
struct snd_pcm_runtime *runtime = substream->runtime;
long buffer_size = snd_pcm_lib_buffer_bytes(substream);
long bytes = frames_to_bytes(runtime, frames);
if (buffer_size == runtime->oss.buffer_bytes)
return bytes;
#if BITS_PER_LONG >= 64
return runtime->oss.buffer_bytes * bytes / buffer_size;
#else
{
u64 bsize = (u64)runtime->oss.buffer_bytes * (u64)bytes;
return div_u64(bsize, buffer_size);
}
#endif
}
static long snd_pcm_alsa_frames(struct snd_pcm_substream *substream, long bytes)
{
struct snd_pcm_runtime *runtime = substream->runtime;
long buffer_size = snd_pcm_lib_buffer_bytes(substream);
if (buffer_size == runtime->oss.buffer_bytes)
return bytes_to_frames(runtime, bytes);
return bytes_to_frames(runtime, (buffer_size * bytes) / runtime->oss.buffer_bytes);
}
static inline
snd_pcm_uframes_t get_hw_ptr_period(struct snd_pcm_runtime *runtime)
{
return runtime->hw_ptr_interrupt;
}
/* define extended formats in the recent OSS versions (if any) */
/* linear formats */
#define AFMT_S32_LE 0x00001000
#define AFMT_S32_BE 0x00002000
#define AFMT_S24_LE 0x00008000
#define AFMT_S24_BE 0x00010000
#define AFMT_S24_PACKED 0x00040000
/* other supported formats */
#define AFMT_FLOAT 0x00004000
#define AFMT_SPDIF_RAW 0x00020000
/* unsupported formats */
#define AFMT_AC3 0x00000400
#define AFMT_VORBIS 0x00000800
static snd_pcm_format_t snd_pcm_oss_format_from(int format)
{
switch (format) {
case AFMT_MU_LAW: return SNDRV_PCM_FORMAT_MU_LAW;
case AFMT_A_LAW: return SNDRV_PCM_FORMAT_A_LAW;
case AFMT_IMA_ADPCM: return SNDRV_PCM_FORMAT_IMA_ADPCM;
case AFMT_U8: return SNDRV_PCM_FORMAT_U8;
case AFMT_S16_LE: return SNDRV_PCM_FORMAT_S16_LE;
case AFMT_S16_BE: return SNDRV_PCM_FORMAT_S16_BE;
case AFMT_S8: return SNDRV_PCM_FORMAT_S8;
case AFMT_U16_LE: return SNDRV_PCM_FORMAT_U16_LE;
case AFMT_U16_BE: return SNDRV_PCM_FORMAT_U16_BE;
case AFMT_MPEG: return SNDRV_PCM_FORMAT_MPEG;
case AFMT_S32_LE: return SNDRV_PCM_FORMAT_S32_LE;
case AFMT_S32_BE: return SNDRV_PCM_FORMAT_S32_BE;
case AFMT_S24_LE: return SNDRV_PCM_FORMAT_S24_LE;
case AFMT_S24_BE: return SNDRV_PCM_FORMAT_S24_BE;
case AFMT_S24_PACKED: return SNDRV_PCM_FORMAT_S24_3LE;
case AFMT_FLOAT: return SNDRV_PCM_FORMAT_FLOAT;
case AFMT_SPDIF_RAW: return SNDRV_PCM_FORMAT_IEC958_SUBFRAME;
default: return SNDRV_PCM_FORMAT_U8;
}
}
static int snd_pcm_oss_format_to(snd_pcm_format_t format)
{
switch (format) {
case SNDRV_PCM_FORMAT_MU_LAW: return AFMT_MU_LAW;
case SNDRV_PCM_FORMAT_A_LAW: return AFMT_A_LAW;
case SNDRV_PCM_FORMAT_IMA_ADPCM: return AFMT_IMA_ADPCM;
case SNDRV_PCM_FORMAT_U8: return AFMT_U8;
case SNDRV_PCM_FORMAT_S16_LE: return AFMT_S16_LE;
case SNDRV_PCM_FORMAT_S16_BE: return AFMT_S16_BE;
case SNDRV_PCM_FORMAT_S8: return AFMT_S8;
case SNDRV_PCM_FORMAT_U16_LE: return AFMT_U16_LE;
case SNDRV_PCM_FORMAT_U16_BE: return AFMT_U16_BE;
case SNDRV_PCM_FORMAT_MPEG: return AFMT_MPEG;
case SNDRV_PCM_FORMAT_S32_LE: return AFMT_S32_LE;
case SNDRV_PCM_FORMAT_S32_BE: return AFMT_S32_BE;
case SNDRV_PCM_FORMAT_S24_LE: return AFMT_S24_LE;
case SNDRV_PCM_FORMAT_S24_BE: return AFMT_S24_BE;
case SNDRV_PCM_FORMAT_S24_3LE: return AFMT_S24_PACKED;
case SNDRV_PCM_FORMAT_FLOAT: return AFMT_FLOAT;
case SNDRV_PCM_FORMAT_IEC958_SUBFRAME: return AFMT_SPDIF_RAW;
default: return -EINVAL;
}
}
static int snd_pcm_oss_period_size(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *oss_params,
struct snd_pcm_hw_params *slave_params)
{
size_t s;
size_t oss_buffer_size, oss_period_size, oss_periods;
size_t min_period_size, max_period_size;
struct snd_pcm_runtime *runtime = substream->runtime;
size_t oss_frame_size;
oss_frame_size = snd_pcm_format_physical_width(params_format(oss_params)) *
params_channels(oss_params) / 8;
oss_buffer_size = snd_pcm_plug_client_size(substream,
snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, NULL)) * oss_frame_size;
oss_buffer_size = rounddown_pow_of_two(oss_buffer_size);
if (atomic_read(&substream->mmap_count)) {
if (oss_buffer_size > runtime->oss.mmap_bytes)
oss_buffer_size = runtime->oss.mmap_bytes;
}
if (substream->oss.setup.period_size > 16)
oss_period_size = substream->oss.setup.period_size;
else if (runtime->oss.fragshift) {
oss_period_size = 1 << runtime->oss.fragshift;
if (oss_period_size > oss_buffer_size / 2)
oss_period_size = oss_buffer_size / 2;
} else {
int sd;
size_t bytes_per_sec = params_rate(oss_params) * snd_pcm_format_physical_width(params_format(oss_params)) * params_channels(oss_params) / 8;
oss_period_size = oss_buffer_size;
do {
oss_period_size /= 2;
} while (oss_period_size > bytes_per_sec);
if (runtime->oss.subdivision == 0) {
sd = 4;
if (oss_period_size / sd > 4096)
sd *= 2;
if (oss_period_size / sd < 4096)
sd = 1;
} else
sd = runtime->oss.subdivision;
oss_period_size /= sd;
if (oss_period_size < 16)
oss_period_size = 16;
}
min_period_size = snd_pcm_plug_client_size(substream,
snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
min_period_size *= oss_frame_size;
min_period_size = roundup_pow_of_two(min_period_size);
if (oss_period_size < min_period_size)
oss_period_size = min_period_size;
max_period_size = snd_pcm_plug_client_size(substream,
snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
max_period_size *= oss_frame_size;
max_period_size = rounddown_pow_of_two(max_period_size);
if (oss_period_size > max_period_size)
oss_period_size = max_period_size;
oss_periods = oss_buffer_size / oss_period_size;
if (substream->oss.setup.periods > 1)
oss_periods = substream->oss.setup.periods;
s = snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
if (runtime->oss.maxfrags && s > runtime->oss.maxfrags)
s = runtime->oss.maxfrags;
if (oss_periods > s)
oss_periods = s;
s = snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
if (s < 2)
s = 2;
if (oss_periods < s)
oss_periods = s;
while (oss_period_size * oss_periods > oss_buffer_size)
oss_period_size /= 2;
if (oss_period_size < 16)
return -EINVAL;
runtime->oss.period_bytes = oss_period_size;
runtime->oss.period_frames = 1;
runtime->oss.periods = oss_periods;
return 0;
}
static int choose_rate(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params, unsigned int best_rate)
{
const struct snd_interval *it;
struct snd_pcm_hw_params *save;
unsigned int rate, prev;
save = kmalloc(sizeof(*save), GFP_KERNEL);
if (save == NULL)
return -ENOMEM;
*save = *params;
it = hw_param_interval_c(save, SNDRV_PCM_HW_PARAM_RATE);
/* try multiples of the best rate */
rate = best_rate;
for (;;) {
if (it->max < rate || (it->max == rate && it->openmax))
break;
if (it->min < rate || (it->min == rate && !it->openmin)) {
int ret;
ret = snd_pcm_hw_param_set(substream, params,
SNDRV_PCM_HW_PARAM_RATE,
rate, 0);
if (ret == (int)rate) {
kfree(save);
return rate;
}
*params = *save;
}
prev = rate;
rate += best_rate;
if (rate <= prev)
break;
}
/* not found, use the nearest rate */
kfree(save);
return snd_pcm_hw_param_near(substream, params, SNDRV_PCM_HW_PARAM_RATE, best_rate, NULL);
}
/* parameter locking: returns immediately if tried during streaming */
static int lock_params(struct snd_pcm_runtime *runtime)
{
if (mutex_lock_interruptible(&runtime->oss.params_lock))
return -ERESTARTSYS;
if (atomic_read(&runtime->oss.rw_ref)) {
mutex_unlock(&runtime->oss.params_lock);
return -EBUSY;
}
return 0;
}
static void unlock_params(struct snd_pcm_runtime *runtime)
{
mutex_unlock(&runtime->oss.params_lock);
}
/* call with params_lock held */
static int snd_pcm_oss_change_params_locked(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_pcm_hw_params *params, *sparams;
struct snd_pcm_sw_params *sw_params;
ssize_t oss_buffer_size, oss_period_size;
size_t oss_frame_size;
int err;
int direct;
snd_pcm_format_t format, sformat;
int n;
const struct snd_mask *sformat_mask;
struct snd_mask mask;
if (!runtime->oss.params)
return 0;
sw_params = kzalloc(sizeof(*sw_params), GFP_KERNEL);
params = kmalloc(sizeof(*params), GFP_KERNEL);
sparams = kmalloc(sizeof(*sparams), GFP_KERNEL);
if (!sw_params || !params || !sparams) {
err = -ENOMEM;
goto failure;
}
if (atomic_read(&substream->mmap_count))
direct = 1;
else
direct = substream->oss.setup.direct;
_snd_pcm_hw_params_any(sparams);
_snd_pcm_hw_param_setinteger(sparams, SNDRV_PCM_HW_PARAM_PERIODS);
_snd_pcm_hw_param_min(sparams, SNDRV_PCM_HW_PARAM_PERIODS, 2, 0);
snd_mask_none(&mask);
if (atomic_read(&substream->mmap_count))
snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
else {
snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED);
if (!direct)
snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
}
err = snd_pcm_hw_param_mask(substream, sparams, SNDRV_PCM_HW_PARAM_ACCESS, &mask);
if (err < 0) {
pcm_dbg(substream->pcm, "No usable accesses\n");
err = -EINVAL;
goto failure;
}
choose_rate(substream, sparams, runtime->oss.rate);
snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_CHANNELS, runtime->oss.channels, NULL);
format = snd_pcm_oss_format_from(runtime->oss.format);
sformat_mask = hw_param_mask_c(sparams, SNDRV_PCM_HW_PARAM_FORMAT);
if (direct)
sformat = format;
else
sformat = snd_pcm_plug_slave_format(format, sformat_mask);
if ((__force int)sformat < 0 ||
!snd_mask_test(sformat_mask, (__force int)sformat)) {
for (sformat = (__force snd_pcm_format_t)0;
(__force int)sformat <= (__force int)SNDRV_PCM_FORMAT_LAST;
sformat = (__force snd_pcm_format_t)((__force int)sformat + 1)) {
if (snd_mask_test(sformat_mask, (__force int)sformat) &&
snd_pcm_oss_format_to(sformat) >= 0)
break;
}
if ((__force int)sformat > (__force int)SNDRV_PCM_FORMAT_LAST) {
pcm_dbg(substream->pcm, "Cannot find a format!!!\n");
err = -EINVAL;
goto failure;
}
}
err = _snd_pcm_hw_param_set(sparams, SNDRV_PCM_HW_PARAM_FORMAT, (__force int)sformat, 0);
if (err < 0)
goto failure;
if (direct) {
memcpy(params, sparams, sizeof(*params));
} else {
_snd_pcm_hw_params_any(params);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
(__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED, 0);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
(__force int)snd_pcm_oss_format_from(runtime->oss.format), 0);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
runtime->oss.channels, 0);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
runtime->oss.rate, 0);
pdprintf("client: access = %i, format = %i, channels = %i, rate = %i\n",
params_access(params), params_format(params),
params_channels(params), params_rate(params));
}
pdprintf("slave: access = %i, format = %i, channels = %i, rate = %i\n",
params_access(sparams), params_format(sparams),
params_channels(sparams), params_rate(sparams));
oss_frame_size = snd_pcm_format_physical_width(params_format(params)) *
params_channels(params) / 8;
err = snd_pcm_oss_period_size(substream, params, sparams);
if (err < 0)
goto failure;
n = snd_pcm_plug_slave_size(substream, runtime->oss.period_bytes / oss_frame_size);
err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, n, NULL);
if (err < 0)
goto failure;
err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIODS,
runtime->oss.periods, NULL);
if (err < 0)
goto failure;
snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, sparams);
if (err < 0) {
pcm_dbg(substream->pcm, "HW_PARAMS failed: %i\n", err);
goto failure;
}
#ifdef CONFIG_SND_PCM_OSS_PLUGINS
snd_pcm_oss_plugin_clear(substream);
if (!direct) {
/* add necessary plugins */
snd_pcm_oss_plugin_clear(substream);
if ((err = snd_pcm_plug_format_plugins(substream,
params,
sparams)) < 0) {
pcm_dbg(substream->pcm,
"snd_pcm_plug_format_plugins failed: %i\n", err);
snd_pcm_oss_plugin_clear(substream);
goto failure;
}
if (runtime->oss.plugin_first) {
struct snd_pcm_plugin *plugin;
if ((err = snd_pcm_plugin_build_io(substream, sparams, &plugin)) < 0) {
pcm_dbg(substream->pcm,
"snd_pcm_plugin_build_io failed: %i\n", err);
snd_pcm_oss_plugin_clear(substream);
goto failure;
}
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
err = snd_pcm_plugin_append(plugin);
} else {
err = snd_pcm_plugin_insert(plugin);
}
if (err < 0) {
snd_pcm_oss_plugin_clear(substream);
goto failure;
}
}
}
#endif
if (runtime->oss.trigger) {
sw_params->start_threshold = 1;
} else {
sw_params->start_threshold = runtime->boundary;
}
if (atomic_read(&substream->mmap_count) ||
substream->stream == SNDRV_PCM_STREAM_CAPTURE)
sw_params->stop_threshold = runtime->boundary;
else
sw_params->stop_threshold = runtime->buffer_size;
sw_params->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
sw_params->period_step = 1;
sw_params->avail_min = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
1 : runtime->period_size;
if (atomic_read(&substream->mmap_count) ||
substream->oss.setup.nosilence) {
sw_params->silence_threshold = 0;