Report NBC buffer stats to the application using new event XINE_EVENT_NBC_STATS

This event reports the buffer status for network streams (NBC) back to the
application, providing a way to measure if the stream delivers data fast
enough. This enables the application to slow down the stream playback to
get the buffers filling more quickly. (This is only a sample application of
the event.)

The event reports all vital data like fill percentage, remaining buffer in
seconds and discontinuity, separately for audio and video, whether the nbc
layer is actually buffering, the operation type (put or get) and also if the
buffering is enabled at all.

In essence, it's the output you get from nbc if you run xine-lib in
verbose mode on the console, but in raw data.

1 files changed, 27 insertions, 1 deletions

diff --git a/src/input/net_buf_ctrl.c b/src/input/net_buf_ctrl.c
index e8af1ae3f..ba17423fb 100644
--- a/src/input/net_buf_ctrl.c
+++ b/src/input/net_buf_ctrl.c
@@ -96,7 +96,6 @@ static void report_progress (xine_stream_t *stream, int p) {
   xine_event_send (stream, &event);
 }
 
-
 static void nbc_set_speed_pause (nbc_t *this) {
   xine_stream_t *stream = this->stream;
 
@@ -138,6 +137,29 @@ static void display_stats (nbc_t *this) {
   fflush(stdout);
 }
 
+static void report_stats (nbc_t *this, int type) {
+  xine_event_t             event;
+  xine_nbc_stats_data_t    bs;
+
+  bs.v_percent = this->video_fifo_fill;
+  bs.v_remaining = this->video_fifo_length;
+  bs.v_bitrate = this->video_br;
+  bs.v_in_disc = this->video_in_disc;
+  bs.a_percent = this->audio_fifo_fill;
+  bs.a_remaining = this->audio_fifo_length;
+  bs.a_bitrate = this->audio_br;
+  bs.a_in_disc = this->audio_in_disc;
+  bs.buffering = this->buffering;
+  bs.enabled = this->enabled;
+  bs.type = type;
+
+  event.type = XINE_EVENT_NBC_STATS;
+  event.data = &bs;
+  event.data_length = sizeof (xine_nbc_stats_data_t);
+
+  xine_event_send (this->stream, &event);
+}
+
 /*  Try to compute the length of the fifo in 1/1000 s
  *  2 methods :
  *    if the bitrate is known
@@ -347,6 +369,8 @@ static void nbc_put_cb (fifo_buffer_t *fifo,
       }
       if(this->stream->xine->verbosity >= XINE_VERBOSITY_DEBUG)
         display_stats(this);
+
+      report_stats(this, 0);
     }
   } else {
 
@@ -466,6 +490,8 @@ static void nbc_get_cb (fifo_buffer_t *fifo,
 
       if(this->stream->xine->verbosity >= XINE_VERBOSITY_DEBUG)
         display_stats(this);
+
+      report_stats(this, 1);
     }
   } else {
     /* discontinuity management */