diff options
Diffstat (limited to 'third_party/libwebrtc/modules/audio_coding/codecs/ilbc/index_conv_dec.c')
-rw-r--r-- | third_party/libwebrtc/modules/audio_coding/codecs/ilbc/index_conv_dec.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/audio_coding/codecs/ilbc/index_conv_dec.c b/third_party/libwebrtc/modules/audio_coding/codecs/ilbc/index_conv_dec.c new file mode 100644 index 0000000000..d78f81a897 --- /dev/null +++ b/third_party/libwebrtc/modules/audio_coding/codecs/ilbc/index_conv_dec.c @@ -0,0 +1,40 @@ +/* + * Copyright (c) 2011 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. + */ + +/****************************************************************** + + iLBC Speech Coder ANSI-C Source Code + + WebRtcIlbcfix_IndexConvDec.c + +******************************************************************/ + +#include "modules/audio_coding/codecs/ilbc/index_conv_dec.h" + +#include "modules/audio_coding/codecs/ilbc/defines.h" + +void WebRtcIlbcfix_IndexConvDec( + int16_t *index /* (i/o) Codebook indexes */ + ){ + int k; + + for (k=4;k<6;k++) { + /* Readjust the second and third codebook index for the first 40 sample + so that they look the same as the first (in terms of lag) + */ + if ((index[k]>=44)&&(index[k]<108)) { + index[k]+=64; + } else if ((index[k]>=108)&&(index[k]<128)) { + index[k]+=128; + } else { + /* ERROR */ + } + } +} |