Add a "control" method to the audio drivers, to allow pause/resume of the

playback stream and to flush buffered samples from from the audio driver.
(Currently implemented in the 'Sun' audio driver, + some untested code in the
alsa 0.9 driver).
The pause/resume method can be used by the engine to immediatelly stop playing
buffered audio samples when the video is paused.
Flushing buffered samples is useful when a video is stopped.  And it'll be
useful for better seeking support, too.

CVS patchset: 1556
CVS date: 2002/03/11 19:58:00

9 files changed, 255 insertions, 45 deletions

diff --git a/src/audio_out/audio_alsa_out.c b/src/audio_out/audio_alsa_out.c
index 574c5ca0f..5f9226b25 100644
--- a/src/audio_out/audio_alsa_out.c
+++ b/src/audio_out/audio_alsa_out.c
@@ -26,7 +26,7 @@
  * (c) 2001 James Courtier-Dutton <James@superbug.demon.co.uk>
  *
  * 
- * $Id: audio_alsa_out.c,v 1.46 2002/02/08 13:13:47 f1rmb Exp $
+ * $Id: audio_alsa_out.c,v 1.47 2002/03/11 19:58:00 jkeil Exp $
  */
 
 #ifdef HAVE_CONFIG_H
@@ -60,7 +60,7 @@
 # endif
 #endif
 
-#define AO_OUT_ALSA_IFACE_VERSION 3
+#define AO_OUT_ALSA_IFACE_VERSION 4
 
 #define GAP_TOLERANCE             5000
 
@@ -77,6 +77,7 @@ typedef struct alsa_driver_s {
   snd_pcm_t    *audio_fd;
   int           capabilities;
   int           open_mode;
+  int		has_pause_resume;
 
   int32_t       output_sample_rate, input_sample_rate;
   double        sample_rate_factor;
@@ -633,6 +634,34 @@ static int ao_alsa_set_property (ao_driver_t *this_gen, int property, int value)
   return ~value;
 }
 
+
+static int ao_alsa_ctrl(ao_driver_t *this_gen, int cmd, ...) {
+  alsa_driver_t *this = (alsa_driver_t *) this_gen;
+
+#if 0
+  switch (cmd) {
+
+  case AO_CTRL_PLAY_PAUSE:
+    if (this->has_pause_resume)
+      snd_pcm_pause(this->audio_fd, 1);
+    break;
+
+  case AO_CTRL_PLAY_RESUME:
+    if (this->has_pause_resume)
+      snd_pcm_pause(this->audio_fd, 0);
+    break;
+
+  case AO_CTRL_FLUSH_BUFFERS:
+    snd_pcm_drop(this->audio_fd);
+    snd_pcm_prepare(this->audio_fd);
+    break;
+  }
+#endif
+
+  return 0;
+}
+
+
 static void ao_alsa_mixer_init(ao_driver_t *this_gen) {
   alsa_driver_t        *this = (alsa_driver_t *) this_gen;
   config_values_t      *config = this->config;
@@ -961,6 +990,9 @@ ao_driver_t *init_audio_out_plugin (config_values_t *config) {
     printf ("(5.1-channel not enabled in xine config) " );
   }
  
+  this->has_pause_resume = ( snd_pcm_hw_params_can_pause (this->audio_fd)
+			    && snd_pcm_hw_params_can_resume (this->audio_fd) );
+
   snd_pcm_close (this->audio_fd);
   this->audio_fd=NULL;
   this->output_sample_rate = 0;
@@ -1005,6 +1037,7 @@ ao_driver_t *init_audio_out_plugin (config_values_t *config) {
   this->ao_driver.close               = ao_alsa_close;
   this->ao_driver.exit                = ao_alsa_exit;
   this->ao_driver.get_gap_tolerance   = ao_alsa_get_gap_tolerance;
+  this->ao_driver.control	      = ao_alsa_ctrl;
 
   return &this->ao_driver;
 }
diff --git a/src/audio_out/audio_arts_out.c b/src/audio_out/audio_arts_out.c
index b4d3933b2..6a98e6738 100644
--- a/src/audio_out/audio_arts_out.c
+++ b/src/audio_out/audio_arts_out.c
@@ -17,7 +17,7 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
  *
- * $Id: audio_arts_out.c,v 1.8 2001/11/18 15:08:30 guenter Exp $
+ * $Id: audio_arts_out.c,v 1.9 2002/03/11 19:58:00 jkeil Exp $
  */
 
 /* required for swab() */
@@ -41,7 +41,7 @@
 #include "xineutils.h"
 #include "audio_out.h"
 
-#define AO_OUT_ARTS_IFACE_VERSION 3
+#define AO_OUT_ARTS_IFACE_VERSION 4
 
 #define AUDIO_NUM_FRAGMENTS     15
 #define AUDIO_FRAGMENT_SIZE   8192
@@ -239,6 +239,28 @@ static int ao_arts_set_property (ao_driver_t *this, int property, int value) {
   return ~value;
 }
 
+/*
+ *
+ */
+static int ao_arts_ctrl(ao_driver_t *this_gen, int cmd, ...) {
+  arts_driver_t *this = (arts_driver_t *) this_gen;
+
+  switch (cmd) {
+
+  case AO_CTRL_PLAY_PAUSE:
+    break;
+
+  case AO_CTRL_PLAY_RESUME:
+    break;
+
+  case AO_CTRL_FLUSH_BUFFERS:
+    break;
+  }
+
+  return 0;
+}
+
+
 ao_driver_t *init_audio_out_plugin (config_values_t *config) {
 
   arts_driver_t *this;
@@ -278,7 +300,8 @@ ao_driver_t *init_audio_out_plugin (config_values_t *config) {
   this->ao_driver.close               = ao_arts_close;
   this->ao_driver.exit                = ao_arts_exit;
   this->ao_driver.get_gap_tolerance   = ao_arts_get_gap_tolerance;
-  
+  this->ao_driver.control	      = ao_arts_ctrl;
+
   return &this->ao_driver;
 }
 
diff --git a/src/audio_out/audio_esd_out.c b/src/audio_out/audio_esd_out.c
index 1c3036cbd..a04e3525a 100644
--- a/src/audio_out/audio_esd_out.c
+++ b/src/audio_out/audio_esd_out.c
@@ -17,7 +17,7 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
  *
- * $Id: audio_esd_out.c,v 1.17 2001/12/18 22:46:16 f1rmb Exp $
+ * $Id: audio_esd_out.c,v 1.18 2002/03/11 19:58:00 jkeil Exp $
  */
 
 #ifdef HAVE_CONFIG_H
@@ -39,7 +39,7 @@
 #include "audio_out.h"
 #include "metronom.h"
 
-#define AO_OUT_ESD_IFACE_VERSION 3
+#define AO_OUT_ESD_IFACE_VERSION 4
 
 #define GAP_TOLERANCE         5000
 
@@ -343,6 +343,25 @@ static int ao_esd_set_property (ao_driver_t *this_gen, int property, int value)
   return ~value;
 }
 
+static int ao_esd_ctrl(ao_driver_t *this_gen, int cmd, ...) {
+  esd_driver_t *this = (esd_driver_t *) this_gen;
+
+
+  switch (cmd) {
+
+  case AO_CTRL_PLAY_PAUSE:
+    break;
+
+  case AO_CTRL_PLAY_RESUME:
+    break;
+
+  case AO_CTRL_FLUSH_BUFFERS:
+    break;
+  }
+
+  return 0;
+}
+
 ao_driver_t *init_audio_out_plugin (config_values_t *config) {
 
   esd_driver_t *this;
@@ -406,6 +425,7 @@ ao_driver_t *init_audio_out_plugin (config_values_t *config) {
   this->ao_driver.write		      = ao_esd_write;
   this->ao_driver.close               = ao_esd_close;
   this->ao_driver.exit                = ao_esd_exit;
+  this->ao_driver.control	      = ao_esd_ctrl;
 
   return &this->ao_driver;
 }
diff --git a/src/audio_out/audio_irixal_out.c b/src/audio_out/audio_irixal_out.c
index d026b643b..04ba8ecc8 100644
--- a/src/audio_out/audio_irixal_out.c
+++ b/src/audio_out/audio_irixal_out.c
@@ -17,7 +17,7 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
  *
- * $Id: audio_irixal_out.c,v 1.5 2002/01/09 15:16:37 mshopf Exp $
+ * $Id: audio_irixal_out.c,v 1.6 2002/03/11 19:58:00 jkeil Exp $
  */
 
 #ifdef HAVE_CONFIG_H
@@ -50,7 +50,7 @@
 //# endif
 //#endif
 
-#define AO_IRIXAL_IFACE_VERSION 3
+#define AO_IRIXAL_IFACE_VERSION 4
 
 #define DEFAULT_GAP_TOLERANCE         5000
 
@@ -286,6 +286,27 @@ static int ao_irixal_set_property (ao_driver_t *this, int property, int value) {
   return ~value;
 }
 
+/*
+ *
+ */
+static int ao_irixal_ctrl(ao_driver_t *this_gen, int cmd, ...) {
+  irixal_driver_t *this = (irixal_driver_t *) this_gen;
+
+  switch (cmd) {
+
+  case AO_CTRL_PLAY_PAUSE:
+    break;
+
+  case AO_CTRL_PLAY_RESUME:
+    break;
+
+  case AO_CTRL_FLUSH_BUFFERS:
+    break;
+  }
+
+  return 0;
+}
+
 ao_driver_t *init_audio_out_plugin (config_values_t *config)
 {
   irixal_driver_t *this;
@@ -372,6 +393,7 @@ ao_driver_t *init_audio_out_plugin (config_values_t *config)
   this->ao_driver.close               = ao_irixal_close;
   this->ao_driver.exit                = ao_irixal_exit;
   this->ao_driver.get_gap_tolerance   = ao_irixal_get_gap_tolerance;
+  this->ao_driver.control	      = ao_irixal_ctrl;
 
   return &this->ao_driver;
 }
diff --git a/src/audio_out/audio_oss_out.c b/src/audio_out/audio_oss_out.c
index 553425927..3fcc7942f 100644
--- a/src/audio_out/audio_oss_out.c
+++ b/src/audio_out/audio_oss_out.c
@@ -17,7 +17,7 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
  *
- * $Id: audio_oss_out.c,v 1.58 2002/03/11 09:01:37 f1rmb Exp $
+ * $Id: audio_oss_out.c,v 1.59 2002/03/11 19:58:00 jkeil Exp $
  *
  * 20-8-2001 First implementation of Audio sync and Audio driver separation.
  * Copyright (C) 2001 James Courtier-Dutton James@superbug.demon.co.uk
@@ -79,7 +79,7 @@
 #       define AFMT_AC3         0x00000400  
 #endif
 
-#define AO_OUT_OSS_IFACE_VERSION 3
+#define AO_OUT_OSS_IFACE_VERSION 4
 
 #define AUDIO_NUM_FRAGMENTS     15
 #define AUDIO_FRAGMENT_SIZE   8192
@@ -561,6 +561,24 @@ static int ao_oss_set_property (ao_driver_t *this_gen, int property, int value)
   return ~value;
 }
 
+static int ao_oss_ctrl(ao_driver_t *this_gen, int cmd, ...) {
+  oss_driver_t *this = (oss_driver_t *) this_gen;
+
+  switch (cmd) {
+
+  case AO_CTRL_PLAY_PAUSE:
+    break;
+
+  case AO_CTRL_PLAY_RESUME:
+    break;
+
+  case AO_CTRL_FLUSH_BUFFERS:
+    break;
+  }
+
+  return 0;
+}
+
 ao_driver_t *init_audio_out_plugin (config_values_t *config) {
 
   oss_driver_t *this;
@@ -837,6 +855,7 @@ ao_driver_t *init_audio_out_plugin (config_values_t *config) {
   this->ao_driver.close               = ao_oss_close;
   this->ao_driver.exit                = ao_oss_exit;
   this->ao_driver.get_gap_tolerance   = ao_oss_get_gap_tolerance;
+  this->ao_driver.control	      = ao_oss_ctrl;
 
   return &this->ao_driver;
 }
diff --git a/src/audio_out/audio_sun_out.c b/src/audio_out/audio_sun_out.c
index f4fb5ec00..9250e2228 100644
--- a/src/audio_out/audio_sun_out.c
+++ b/src/audio_out/audio_sun_out.c
@@ -17,7 +17,7 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
  *
- * $Id: audio_sun_out.c,v 1.17 2002/02/23 17:22:09 jkeil Exp $
+ * $Id: audio_sun_out.c,v 1.18 2002/03/11 19:58:01 jkeil Exp $
  */
 
 #ifdef HAVE_CONFIG_H
@@ -56,7 +56,7 @@
 #define	AUDIO_PRECISION_16	16
 #endif
 
-#define AO_SUN_IFACE_VERSION 3
+#define AO_SUN_IFACE_VERSION 4
 
 #define GAP_TOLERANCE         5000
 #define GAP_NONRT_TOLERANCE  15000
@@ -598,6 +598,55 @@ static int ao_sun_set_property (ao_driver_t *this_gen, int property, int value)
   return ~value;
 }
 
+static int ao_sun_ctrl(ao_driver_t *this_gen, int cmd, ...) {
+  sun_driver_t *this = (sun_driver_t *) this_gen;
+  audio_info_t	info;
+
+  switch (cmd) {
+
+  case AO_CTRL_PLAY_PAUSE:
+    AUDIO_INITINFO(&info);
+    info.play.pause = 1;
+    ioctl(this->audio_fd, AUDIO_SETINFO, &info);
+    break;
+
+  case AO_CTRL_PLAY_RESUME:
+    AUDIO_INITINFO(&info);
+    info.play.pause = 0;
+    ioctl(this->audio_fd, AUDIO_SETINFO, &info);
+    break;
+
+  case AO_CTRL_FLUSH_BUFFERS:
+#ifdef	__svr4__
+    /* flush buffered STEAMS data first */
+    ioctl(this->audio_fd, I_FLUSH, FLUSHW);
+
+    /* 
+     * the flush above discarded an unknown amount of data from the
+     * audio device.  To get the "*_delay" computation in sync again,
+     * reset the audio device's sample counter to 0, after waiting
+     * that all samples still active playing on the sound hardware
+     * have finished playing.
+     */
+    AUDIO_INITINFO(&info);
+    info.play.pause = 0;
+    ioctl(this->audio_fd, AUDIO_SETINFO, &info);
+
+    ioctl(this->audio_fd, AUDIO_DRAIN);
+
+    AUDIO_INITINFO(&info);
+    info.play.samples = 0;
+    ioctl(this->audio_fd, AUDIO_SETINFO, &info);
+
+    this->frames_in_buffer = 0;
+    this->last_samplecnt = 0;
+#endif
+    break;
+  }
+
+  return 0;
+}
+
 ao_driver_t *init_audio_out_plugin (config_values_t *config) {
 
   sun_driver_t	  *this;
@@ -683,6 +732,7 @@ ao_driver_t *init_audio_out_plugin (config_values_t *config) {
   this->ao_driver.close			= ao_sun_close;
   this->ao_driver.exit			= ao_sun_exit;
   this->ao_driver.get_gap_tolerance     = ao_sun_get_gap_tolerance;
+  this->ao_driver.control		= ao_sun_ctrl;
 
   return &this->ao_driver;
 }
diff --git a/src/xine-engine/audio_out.c b/src/xine-engine/audio_out.c
index 56f777469..4d97da9d1 100644
--- a/src/xine-engine/audio_out.c
+++ b/src/xine-engine/audio_out.c
@@ -17,7 +17,7 @@
  * along with self program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
  *
- * $Id: audio_out.c,v 1.44 2002/03/11 12:31:26 guenter Exp $
+ * $Id: audio_out.c,v 1.45 2002/03/11 19:58:01 jkeil Exp $
  * 
  * 22-8-2001 James imported some useful AC3 sections from the previous alsa driver.
  *   (c) 2001 Andy Lo A Foe <andy@alsaplayer.org>
@@ -240,7 +240,8 @@ static void *ao_loop (void *this_gen) {
   int64_t         cur_time;
   int             num_output_frames ;
   int             paused_wait;
-  
+
+
   while ((this->audio_loop_running) ||
 	 (!this->audio_loop_running && this->out_fifo->first)) {
 
@@ -564,6 +565,20 @@ static int ao_set_property (ao_instance_t *this, int property, int value) {
   return(this->driver->set_property(this->driver, property, value));
 }
 
+static int ao_control (ao_instance_t *this, int cmd, ...) {
+
+  va_list args;
+  void *arg;
+  int rval;
+
+  va_start(args, cmd);
+  arg = va_arg(args, void*);
+  rval = this->driver->control(this->driver, cmd, arg);
+  va_end(args);
+
+  return rval;
+}
+
 ao_instance_t *ao_new_instance (ao_driver_t *driver, xine_t *xine) {
  
   config_values_t *config = xine->config;
@@ -585,6 +600,7 @@ ao_instance_t *ao_new_instance (ao_driver_t *driver, xine_t *xine) {
   this->get_capabilities      = ao_get_capabilities;
   this->get_property          = ao_get_property;
   this->set_property          = ao_set_property;
+  this->control		      = ao_control;
   this->audio_loop_running    = 0;
   this->audio_paused          = 0;
   /* FIXME: is 4* good enough for all resample cases?? */
diff --git a/src/xine-engine/audio_out.h b/src/xine-engine/audio_out.h
index dd820a6f4..471c21a2e 100644
--- a/src/xine-engine/audio_out.h
+++ b/src/xine-engine/audio_out.h
@@ -17,7 +17,7 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
  *
- * $Id: audio_out.h,v 1.25 2002/03/11 12:31:26 guenter Exp $
+ * $Id: audio_out.h,v 1.26 2002/03/11 19:58:01 jkeil Exp $
  */
 #ifndef HAVE_AUDIO_OUT_H
 #define HAVE_AUDIO_OUT_H
@@ -37,7 +37,7 @@ extern "C" {
 #endif
 
 
-#define AUDIO_OUT_IFACE_VERSION  3
+#define AUDIO_OUT_IFACE_VERSION  4
 
 /*
  * ao_driver_s contains the driver every audio output
@@ -113,12 +113,19 @@ struct ao_driver_s {
    * get_property() return 1 in success, 0 on failure.
    * set_property() return value on success, ~value on failure.
    *
-   * See AC_PROP_* bellow for available properties.
+   * See AO_PROP_* below for available properties.
    */
   int (*get_property) (ao_driver_t *this, int property);
 
-  int (*set_property) (ao_driver_t *this,  int property, int value);
+  int (*set_property) (ao_driver_t *this, int property, int value);
 
+
+  /*
+   * misc control operations on the audio device.
+   *
+   * See AO_CTRL_* below.
+   */
+  int (*control) (ao_driver_t *this, int cmd, /* arg */ ...);
 };
 
 /*
@@ -179,6 +186,14 @@ struct ao_instance_s {
   /* called on xine exit */
   void (*exit) (ao_instance_t *this);
 
+  /*
+   * misc control operations on the audio device.
+   *
+   * See AO_CTRL_* below.
+   */
+  int (*control) (ao_driver_t *this, int cmd, /* arg */ ...);
+
+
   /* private stuff */
 
   ao_driver_t    *driver;
@@ -252,6 +267,13 @@ ao_instance_t *ao_new_instance (ao_driver_t *driver, xine_t *xine) ;
 #define AO_PROP_PCM_VOL         1
 #define AO_PROP_MUTE_VOL        2
 
+
+/* audio device control ops */
+#define AO_CTRL_PLAY_PAUSE	0
+#define AO_CTRL_PLAY_RESUME	1
+#define	AO_CTRL_FLUSH_BUFFERS	2
+
+
 typedef struct ao_info_s {
 
   int     interface_version;
diff --git a/src/xine-engine/xine.c b/src/xine-engine/xine.c
index 691700e91..2e0a2f527 100644
--- a/src/xine-engine/xine.c
+++ b/src/xine-engine/xine.c
@@ -17,7 +17,7 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
  *
- * $Id: xine.c,v 1.106 2002/03/11 12:31:26 guenter Exp $
+ * $Id: xine.c,v 1.107 2002/03/11 19:58:01 jkeil Exp $
  *
  * top-level xine functions
  *
@@ -144,6 +144,27 @@ static void update_osd_display(void *this_gen, cfg_entry_t *entry)
   this->osd_display = entry->num_value;
 }
 
+
+static void xine_set_speed_internal (xine_t *this, int speed) {
+
+  this->metronom->set_speed (this->metronom, speed);
+
+  /* see coment on audio_out loop about audio_paused */
+  if( this->audio_out ) {
+    this->audio_out->audio_paused = (speed != SPEED_NORMAL) + 
+                                    (speed == SPEED_PAUSE);
+
+    if (speed != SPEED_NORMAL && speed != SPEED_PAUSE)
+	this->audio_out->control(this->audio_out, AO_CTRL_FLUSH_BUFFERS);
+
+    this->audio_out->control(this->audio_out,
+			     speed == SPEED_PAUSE ? AO_CTRL_PLAY_PAUSE : AO_CTRL_PLAY_RESUME);
+  }
+
+  this->speed = speed;
+}
+
+
 void xine_stop_internal (xine_t *this) {
 
   pthread_mutex_lock (&this->xine_lock);
@@ -158,12 +179,10 @@ void xine_stop_internal (xine_t *this) {
     return;
   }
 
+  if (this->audio_out)
+    this->audio_out->control(this->audio_out, AO_CTRL_FLUSH_BUFFERS);
 
-  this->metronom->set_speed (this->metronom, SPEED_NORMAL);
-  this->speed      = SPEED_NORMAL;
-
-  if( this->audio_out )
-    this->audio_out->audio_paused = 0;
+  xine_set_speed_internal(this, SPEED_NORMAL);
 
   this->status = XINE_STOP;
   LOG_MSG(this, _("xine_stop: stopping demuxer\n"));
@@ -300,6 +319,9 @@ int xine_play (xine_t *this, char *mrl,
 	this->cur_input_plugin->stop(this->cur_input_plugin);
     }
 
+    if (this->audio_out)
+      this->audio_out->control(this->audio_out, AO_CTRL_FLUSH_BUFFERS);
+
     this->status = XINE_STOP;
   }
 
@@ -378,11 +400,7 @@ int xine_play (xine_t *this, char *mrl,
     this->status = XINE_PLAY;
     strncpy (this->cur_mrl, mrl, 1024);
     
-    this->metronom->set_speed (this->metronom, SPEED_NORMAL);
-
-    if( this->audio_out )
-      this->audio_out->audio_paused = 0;
-    this->speed = SPEED_NORMAL;
+    xine_set_speed_internal (this, SPEED_NORMAL);
 
     /* osd */
     xine_internal_osd (this, ">", 0, 300000);
@@ -679,8 +697,6 @@ int xine_get_av_offset (xine_t *this) {
 
 void xine_set_speed (xine_t *this, int speed) {
 
-  struct timespec tenth_sec;
-
   pthread_mutex_lock (&this->xine_lock);
 
   if (speed <= SPEED_PAUSE) 
@@ -712,21 +728,10 @@ void xine_set_speed (xine_t *this, int speed) {
   } 
 
   /* make sure osd can be displayed */
-  tenth_sec.tv_sec = 0;
-  tenth_sec.tv_nsec = 100000000;
-
-  nanosleep (&tenth_sec, NULL);
+  xine_usec_sleep(100000);
 
   LOG_MSG(this, _("xine: set_speed %d\n"), speed);
-
-  this->metronom->set_speed (this->metronom, speed);
-
-  /* see coment on audio_out loop about audio_paused */
-  if( this->audio_out )
-    this->audio_out->audio_paused = (speed != SPEED_NORMAL) + 
-                                    (speed == SPEED_PAUSE);
-
-  this->speed      = speed;
+  xine_set_speed_internal (this, speed);
 
   pthread_mutex_unlock (&this->xine_lock);
 }