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Add a mode_info call to obtain the sampling rate of the current mode.

--- a/libcelt/celt.h

+++ b/libcelt/celt.h

@@ -87,6 +87,8 @@

 #define CELT_GET_LOOKAHEAD    1001

 /** GET the number of channels used in the current mode */

 #define CELT_GET_NB_CHANNELS  1002

+/** GET the sample rate used in the current mode */

+#define CELT_GET_SAMPLE_RATE  1003

 /** GET the bit-stream version for compatibility check */

 #define CELT_GET_BITSTREAM_VERSION 2000

--- a/libcelt/modes.c

+++ b/libcelt/modes.c

@@ -68,6 +68,9 @@

       case CELT_GET_BITSTREAM_VERSION:

          *value = CELT_BITSTREAM_VERSION;

          break;

+      case CELT_GET_SAMPLE_RATE:

+         *value = mode->Fs;

+         break;

       default:

          return CELT_UNIMPLEMENTED;

    }