summaryrefslogtreecommitdiff
path: root/sys/oss/gstosshelper.c
diff options
context:
space:
mode:
Diffstat (limited to 'sys/oss/gstosshelper.c')
-rw-r--r--sys/oss/gstosshelper.c407
1 files changed, 407 insertions, 0 deletions
diff --git a/sys/oss/gstosshelper.c b/sys/oss/gstosshelper.c
new file mode 100644
index 0000000..6d7e6bd
--- /dev/null
+++ b/sys/oss/gstosshelper.c
@@ -0,0 +1,407 @@
+/* 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;
+ /* FIXME: this is not working for all cards, see bug #518474 */
+ 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;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-21 17:07:53 +0000