Fix common misspellings

I stumbled upon the typo in README.draft, so took the opportunity to
grep for common misspellings using List_of_common_misspellings.txt for
hunspell.

Author: foolip

README.draft

@@ -51,4 +51,4 @@ options:
 -loss <perc>         : simulate packet loss, in percent (0-100); default: 0
 
 input and output are little endian signed 16-bit PCM files or opus bitstreams
-with simple opus_demo propritary framing.
+with simple opus_demo proprietary framing.

doc/Doxyfile.in

@@ -835,7 +835,7 @@ HTML_FILE_EXTENSION    = .html
 # standard header. Note that when using a custom header you are responsible
 # for the proper inclusion of any scripts and style sheets that doxygen
 # needs, which is dependent on the configuration options used.
-# It is adviced to generate a default header using "doxygen -w html
+# It is advised to generate a default header using "doxygen -w html
 # header.html footer.html stylesheet.css YourConfigFile" and then modify
 # that header. Note that the header is subject to change so you typically
 # have to redo this when upgrading to a newer version of doxygen or when changing the value of configuration settings such as GENERATE_TREEVIEW!

doc/draft-ietf-codec-opus.xml

@@ -7528,7 +7528,7 @@ implementation. The passing threshold (quality 0) was calibrated in such a way t
 additive white noise with a 48 dB SNR (similar to what can be obtained on a cassette deck).
 It is still possible for an implementation to sound very good with such a low quality measure
 (e.g. if the deviation is due to inaudible phase distortion), but unless this is verified by
-listening tests, it is RECOMMENDED that implementations achive a quality above 90 for 48 kHz
+listening tests, it is RECOMMENDED that implementations achieve a quality above 90 for 48 kHz
 decoding. For other sampling rates, it is normal for the quality metric to be lower
 (typically as low as 50 even for a good implementation) because of harmless mismatch with
 the delay and phase of the internal sampling rate conversion.

doc/draft-spittka-payload-rtp-opus.xml

@@ -761,7 +761,7 @@
               "maxcodedaudiobandwidth" as this would lead to inefficient use of network resources. The "maxcodedaudiobandwidth" parameter does not
 	      affect interoperability. Also, this parameter SHOULD NOT be used
 	      to adjust the audio bandwidth as a function of the bitrates, as this
-	      is the responsability of the Opus encoder implementation.
+	      is the responsibility of the Opus encoder implementation.
             </t>
 
             <t>The parameter "maxaveragebitrate" is a unidirectional receive-only

include/opus.h

@@ -371,7 +371,7 @@ OPUS_EXPORT int opus_encoder_ctl(OpusEncoder *st, int request, ...) OPUS_ARG_NON
   * @li max_size is the max duration of the frame in samples (per channel) that can fit into the decoded_frame array
   *
   * opus_decode() and opus_decode_float() return the number of samples (per channel) decoded from the packet.
-  * If that value is negative, then an error has occured. This can occur if the packet is corrupted or if the audio
+  * If that value is negative, then an error has occurred. This can occur if the packet is corrupted or if the audio
   * buffer is too small to hold the decoded audio.
   *
   * Opus is a stateful codec with overlapping blocks and as a result Opus

include/opus_multistream.h

@@ -108,7 +108,7 @@ extern "C" {
   * elementary Opus stream, the encoder and decoder must negotiate the channel
   * configuration before the decoder can successfully interpret the data in the
   * packets produced by the encoder. Some basic information, such as packet
-  * duration, can be computed without any special negotation.
+  * duration, can be computed without any special negotiation.
   *
   * The format for multistream Opus packets is defined in the
   * <a href="http://tools.ietf.org/html/draft-terriberry-oggopus">Ogg

opus.m4

@@ -102,7 +102,7 @@ int main ()
        echo "*** If you have an old version installed, it is best to remove it, although"
        echo "*** you may also be able to get things to work by modifying LD_LIBRARY_PATH"],
        [ echo "*** The test program failed to compile or link. See the file config.log for the"
-       echo "*** exact error that occured. This usually means Opus was incorrectly installed"
+       echo "*** exact error that occurred. This usually means Opus was incorrectly installed"
        echo "*** or that you have moved Opus since it was installed." ])
        CFLAGS="$ac_save_CFLAGS"
        LIBS="$ac_save_LIBS"

silk/NLSF_stabilize.c

@@ -31,7 +31,7 @@ POSSIBILITY OF SUCH DAMAGE.
 
 /* NLSF stabilizer:                                         */
 /*                                                          */
-/* - Moves NLSFs futher apart if they are too close         */
+/* - Moves NLSFs further apart if they are too close        */
 /* - Moves NLSFs away from borders if they are too close    */
 /* - High effort to achieve a modification with minimum     */
 /*     Euclidean distance to input vector                   */

silk/PLC.c

@@ -363,7 +363,7 @@ static inline void silk_PLC_conceal(
     RESTORE_STACK;
 }
 
-/* Glues concealed frames with new good recieved frames */
+/* Glues concealed frames with new good received frames */
 void silk_PLC_glue_frames(
     silk_decoder_state                  *psDec,             /* I/O decoder state        */
     opus_int16                          frame[],            /* I/O signal               */

silk/SigProc_FIX.h

@@ -313,7 +313,7 @@ void silk_burg_modified(
     opus_int32                  A_Q16[],            /* O    Prediction coefficients (length order)                      */
     const opus_int16            x[],                /* I    Input signal, length: nb_subfr * ( D + subfr_length )       */
     const opus_int32            minInvGain_Q30,     /* I    Inverse of max prediction gain                              */
-    const opus_int              subfr_length,       /* I    Input signal subframe length (incl. D preceeding samples)   */
+    const opus_int              subfr_length,       /* I    Input signal subframe length (incl. D preceding samples)    */
     const opus_int              nb_subfr,           /* I    Number of subframes stacked in x                            */
     const opus_int              D                   /* I    Order                                                       */
 );
@@ -379,7 +379,7 @@ static inline opus_int32 silk_ROR32( opus_int32 a32, opus_int rot )
     }
 }
 
-/* Allocate opus_int16 alligned to 4-byte memory address */
+/* Allocate opus_int16 aligned to 4-byte memory address */
 #if EMBEDDED_ARM
 #define silk_DWORD_ALIGN __attribute__((aligned(4)))
 #else