Miscellaneous changes split from https://codereview.webrtc.org/1230503003 .

webrtc/modules/audio_coding/codecs/isac/main/source/isac.c

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 732 matching lines @@
   }
 
   /* Generate CRC if required. */
   if ((instISAC->bandwidthKHz != isac8kHz) && (streamLenUB > 0)) {
     uint32_t crc;
 
     WebRtcIsac_GetCrc((int16_t*)(&(encoded[streamLenLB + 1])),
                       streamLenUB + garbageLen, &crc);
 #ifndef WEBRTC_ARCH_BIG_ENDIAN
     for (k = 0; k < LEN_CHECK_SUM_WORD8; k++) {
-      encoded[streamLen - LEN_CHECK_SUM_WORD8 + k] = crc >> (24 - k * 8);
+      encoded[streamLen - LEN_CHECK_SUM_WORD8 + k] =
+          (uint8_t)(crc >> (24 - k * 8));
     }
 #else
     memcpy(&encoded[streamLenLB + streamLenUB + 1], &crc, LEN_CHECK_SUM_WORD8);
 #endif
   }
   return streamLen;
 }
 
 
 /******************************************************************************
@@ skipping 1644 matching lines @@
 }
 
 void WebRtcIsac_SetEncSampRateInDecoder(ISACStruct* inst,
                                         int sample_rate_hz) {
   ISACMainStruct* instISAC = (ISACMainStruct*)inst;
   assert(instISAC->initFlag & BIT_MASK_DEC_INIT);
   assert(!(instISAC->initFlag & BIT_MASK_ENC_INIT));
   assert(sample_rate_hz == 16000 || sample_rate_hz == 32000);
   instISAC->encoderSamplingRateKHz = sample_rate_hz / 1000;
 }