gstreamer/sys/oss/gstosshelper.c

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wim.taymans@chello.be>
*
* gstosshelper.c: OSS helper routines
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gst/gst-i18n-plugin.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#ifdef HAVE_OSS_INCLUDE_IN_SYS
# include <sys/soundcard.h>
#else
# ifdef HAVE_OSS_INCLUDE_IN_ROOT
# include <soundcard.h>
# else
# ifdef HAVE_OSS_INCLUDE_IN_MACHINE
# include <machine/soundcard.h>
# else
# error "What to include?"
# endif /* HAVE_OSS_INCLUDE_IN_MACHINE */
# endif /* HAVE_OSS_INCLUDE_IN_ROOT */
#endif /* HAVE_OSS_INCLUDE_IN_SYS */
#include <gst/interfaces/propertyprobe.h>
#include "gstosshelper.h"
#include "gstossmixer.h"
GST_DEBUG_CATEGORY_EXTERN (oss_debug);
#define GST_CAT_DEFAULT oss_debug
typedef struct _GstOssProbe GstOssProbe;
struct _GstOssProbe
{
int fd;
int format;
int n_channels;
GArray *rates;
int min;
int max;
};
typedef struct _GstOssRange GstOssRange;
struct _GstOssRange
{
int min;
int max;
};
static GstStructure *gst_oss_helper_get_format_structure (unsigned int
format_bit);
static gboolean gst_oss_helper_rate_probe_check (GstOssProbe * probe);
static int gst_oss_helper_rate_check_rate (GstOssProbe * probe, int irate);
static void gst_oss_helper_rate_add_range (GQueue * queue, int min, int max);
static void gst_oss_helper_rate_add_rate (GArray * array, int rate);
static int gst_oss_helper_rate_int_compare (gconstpointer a, gconstpointer b);
GstCaps *
gst_oss_helper_probe_caps (gint fd)
{
GstOssProbe *probe;
int i;
gboolean ret;
GstStructure *structure;
unsigned int format_bit;
unsigned int format_mask;
GstCaps *caps;
/* FIXME test make sure we're not currently playing */
/* FIXME test both mono and stereo */
format_mask = AFMT_U8 | AFMT_S8;
if (G_BYTE_ORDER == G_LITTLE_ENDIAN)
format_mask |= AFMT_S16_LE | AFMT_U16_LE;
else
format_mask |= AFMT_S16_BE | AFMT_U16_BE;
caps = gst_caps_new_empty ();
/* assume that the most significant bit of format_mask is 0 */
for (format_bit = 1 << 31; format_bit > 0; format_bit >>= 1) {
if (format_bit & format_mask) {
GValue rate_value = { 0 };
probe = g_new0 (GstOssProbe, 1);
probe->fd = fd;
probe->format = format_bit;
probe->n_channels = 2;
ret = gst_oss_helper_rate_probe_check (probe);
if (probe->min == -1 || probe->max == -1) {
g_array_free (probe->rates, TRUE);
g_free (probe);
continue;
}
if (ret) {
GValue value = { 0 };
g_array_sort (probe->rates, gst_oss_helper_rate_int_compare);
g_value_init (&rate_value, GST_TYPE_LIST);
g_value_init (&value, G_TYPE_INT);
for (i = 0; i < probe->rates->len; i++) {
g_value_set_int (&value, g_array_index (probe->rates, int, i));
gst_value_list_append_value (&rate_value, &value);
}
g_value_unset (&value);
} else {
/* one big range */
g_value_init (&rate_value, GST_TYPE_INT_RANGE);
gst_value_set_int_range (&rate_value, probe->min, probe->max);
}
g_array_free (probe->rates, TRUE);
g_free (probe);
structure = gst_oss_helper_get_format_structure (format_bit);
gst_structure_set (structure, "channels", GST_TYPE_INT_RANGE, 1, 2, NULL);
gst_structure_set_value (structure, "rate", &rate_value);
g_value_unset (&rate_value);
gst_caps_append_structure (caps, structure);
}
}
if (gst_caps_is_empty (caps)) {
/* fixme: make user-visible */
GST_WARNING ("Your OSS device could not be probed correctly");
}
GST_DEBUG ("probed caps: %" GST_PTR_FORMAT, caps);
return caps;
}
static GstStructure *
gst_oss_helper_get_format_structure (unsigned int format_bit)
{
GstStructure *structure;
int endianness;
gboolean sign;
int width;
switch (format_bit) {
case AFMT_U8:
endianness = 0;
sign = FALSE;
width = 8;
break;
case AFMT_S16_LE:
endianness = G_LITTLE_ENDIAN;
sign = TRUE;
width = 16;
break;
case AFMT_S16_BE:
endianness = G_BIG_ENDIAN;
sign = TRUE;
width = 16;
break;
case AFMT_S8:
endianness = 0;
sign = TRUE;
width = 8;
break;
case AFMT_U16_LE:
endianness = G_LITTLE_ENDIAN;
sign = FALSE;
width = 16;
break;
case AFMT_U16_BE:
endianness = G_BIG_ENDIAN;
sign = FALSE;
width = 16;
break;
default:
g_assert_not_reached ();
return NULL;
}
structure = gst_structure_new ("audio/x-raw-int",
"width", G_TYPE_INT, width,
"depth", G_TYPE_INT, width, "signed", G_TYPE_BOOLEAN, sign, NULL);
if (endianness) {
gst_structure_set (structure, "endianness", G_TYPE_INT, endianness, NULL);
}
return structure;
}
static gboolean
gst_oss_helper_rate_probe_check (GstOssProbe * probe)
{
GstOssRange *range;
GQueue *ranges;
int exact_rates = 0;
gboolean checking_exact_rates = TRUE;
int n_checks = 0;
gboolean result = TRUE;
ranges = g_queue_new ();
probe->rates = g_array_new (FALSE, FALSE, sizeof (int));
probe->min = gst_oss_helper_rate_check_rate (probe, 1000);
n_checks++;
probe->max = gst_oss_helper_rate_check_rate (probe, 100000);
/* a little bug workaround */
{
int max;
max = gst_oss_helper_rate_check_rate (probe, 48000);
if (max > probe->max) {
GST_ERROR
("Driver bug recognized (driver does not round rates correctly). Please file a bug report.");
probe->max = max;
}
}
n_checks++;
if (probe->min == -1 || probe->max == -1) {
/* This is a workaround for drivers that return -EINVAL (or another
* error) for rates outside of [8000,48000]. If this fails, the
* driver is seriously buggy, and probably doesn't work with other
* media libraries/apps. */
probe->min = gst_oss_helper_rate_check_rate (probe, 8000);
probe->max = gst_oss_helper_rate_check_rate (probe, 48000);
}
if (probe->min == -1 || probe->max == -1) {
GST_DEBUG ("unexpected check_rate error");
return FALSE;
}
gst_oss_helper_rate_add_range (ranges, probe->min + 1, probe->max - 1);
while ((range = g_queue_pop_head (ranges))) {
int min1;
int max1;
int mid;
int mid_ret;
GST_DEBUG ("checking [%d,%d]", range->min, range->max);
mid = (range->min + range->max) / 2;
mid_ret = gst_oss_helper_rate_check_rate (probe, mid);
if (mid_ret == -1) {
/* FIXME ioctl returned an error. do something */
GST_DEBUG ("unexpected check_rate error");
}
n_checks++;
if (mid == mid_ret && checking_exact_rates) {
int max_exact_matches = 20;
exact_rates++;
if (exact_rates > max_exact_matches) {
GST_DEBUG ("got %d exact rates, assuming all are exact",
max_exact_matches);
result = FALSE;
g_free (range);
break;
}
} else {
checking_exact_rates = FALSE;
}
/* Assume that the rate is arithmetically rounded to the nearest
* supported rate. */
if (mid == mid_ret) {
min1 = mid - 1;
max1 = mid + 1;
} else {
if (mid < mid_ret) {
min1 = mid - (mid_ret - mid);
max1 = mid_ret + 1;
} else {
min1 = mid_ret - 1;
max1 = mid + (mid - mid_ret);
}
}
gst_oss_helper_rate_add_range (ranges, range->min, min1);
gst_oss_helper_rate_add_range (ranges, max1, range->max);
g_free (range);
}
while ((range = g_queue_pop_head (ranges))) {
g_free (range);
}
g_queue_free (ranges);
return result;
}
static void
gst_oss_helper_rate_add_range (GQueue * queue, int min, int max)
{
if (min <= max) {
GstOssRange *range = g_new0 (GstOssRange, 1);
range->min = min;
range->max = max;
g_queue_push_tail (queue, range);
/* push_head also works, but has different probing behavior */
/*g_queue_push_head (queue, range); */
}
}
static int
gst_oss_helper_rate_check_rate (GstOssProbe * probe, int irate)
{
int rate;
int format;
int n_channels;
int ret;
rate = irate;
format = probe->format;
n_channels = probe->n_channels;
GST_LOG ("checking format %d, channels %d, rate %d",
format, n_channels, rate);
ret = ioctl (probe->fd, SNDCTL_DSP_SETFMT, &format);
if (ret < 0 || format != probe->format) {
GST_DEBUG ("unsupported format: %d (%d)", probe->format, format);
return -1;
}
ret = ioctl (probe->fd, SNDCTL_DSP_CHANNELS, &n_channels);
if (ret < 0 || n_channels != probe->n_channels) {
GST_DEBUG ("unsupported channels: %d (%d)", probe->n_channels, n_channels);
return -1;
}
ret = ioctl (probe->fd, SNDCTL_DSP_SPEED, &rate);
if (ret < 0) {
GST_DEBUG ("unsupported rate: %d (%d)", irate, rate);
return -1;
}
GST_DEBUG ("rate %d -> %d", irate, rate);
if (rate == irate - 1 || rate == irate + 1) {
rate = irate;
}
gst_oss_helper_rate_add_rate (probe->rates, rate);
return rate;
}
static void
gst_oss_helper_rate_add_rate (GArray * array, int rate)
{
int i;
int val;
for (i = 0; i < array->len; i++) {
val = g_array_index (array, int, i);
if (val == rate)
return;
}
GST_DEBUG ("supported rate: %d", rate);
g_array_append_val (array, rate);
}
static int
gst_oss_helper_rate_int_compare (gconstpointer a, gconstpointer b)
{
const int *va = (const int *) a;
const int *vb = (const int *) b;
if (*va < *vb)
return -1;
if (*va > *vb)
return 1;
return 0;
}