ogg/vorbis/opus: Make them modules and unbundle thirdparty libs

Took the opportunity to undo the Godot changed made to the
opus source. The opus module should eventually be built in its
own environment to avoid polluting others with too many include
dirs and defines.

TODO: Fix the platform/ stuff for opus.

1 files changed, 73 insertions, 0 deletions

diff --git a/thirdparty/opus/silk/stereo_decode_pred.c b/thirdparty/opus/silk/stereo_decode_pred.c
new file mode 100644
index 0000000000..56ba3925e8
--- /dev/null
+++ b/thirdparty/opus/silk/stereo_decode_pred.c
@@ -0,0 +1,73 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "main.h"
+
+/* Decode mid/side predictors */
+void silk_stereo_decode_pred(
+    ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
+    opus_int32                  pred_Q13[]                      /* O    Predictors                                  */
+)
+{
+    opus_int   n, ix[ 2 ][ 3 ];
+    opus_int32 low_Q13, step_Q13;
+
+    /* Entropy decoding */
+    n = ec_dec_icdf( psRangeDec, silk_stereo_pred_joint_iCDF, 8 );
+    ix[ 0 ][ 2 ] = silk_DIV32_16( n, 5 );
+    ix[ 1 ][ 2 ] = n - 5 * ix[ 0 ][ 2 ];
+    for( n = 0; n < 2; n++ ) {
+        ix[ n ][ 0 ] = ec_dec_icdf( psRangeDec, silk_uniform3_iCDF, 8 );
+        ix[ n ][ 1 ] = ec_dec_icdf( psRangeDec, silk_uniform5_iCDF, 8 );
+    }
+
+    /* Dequantize */
+    for( n = 0; n < 2; n++ ) {
+        ix[ n ][ 0 ] += 3 * ix[ n ][ 2 ];
+        low_Q13 = silk_stereo_pred_quant_Q13[ ix[ n ][ 0 ] ];
+        step_Q13 = silk_SMULWB( silk_stereo_pred_quant_Q13[ ix[ n ][ 0 ] + 1 ] - low_Q13,
+            SILK_FIX_CONST( 0.5 / STEREO_QUANT_SUB_STEPS, 16 ) );
+        pred_Q13[ n ] = silk_SMLABB( low_Q13, step_Q13, 2 * ix[ n ][ 1 ] + 1 );
+    }
+
+    /* Subtract second from first predictor (helps when actually applying these) */
+    pred_Q13[ 0 ] -= pred_Q13[ 1 ];
+}
+
+/* Decode mid-only flag */
+void silk_stereo_decode_mid_only(
+    ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
+    opus_int                    *decode_only_mid                /* O    Flag that only mid channel has been coded   */
+)
+{
+    /* Decode flag that only mid channel is coded */
+    *decode_only_mid = ec_dec_icdf( psRangeDec, silk_stereo_only_code_mid_iCDF, 8 );
+}