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Diffstat (limited to '')
-rw-r--r-- | third_party/libwebrtc/modules/audio_coding/codecs/ilbc/filtered_cb_vecs.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/audio_coding/codecs/ilbc/filtered_cb_vecs.c b/third_party/libwebrtc/modules/audio_coding/codecs/ilbc/filtered_cb_vecs.c new file mode 100644 index 0000000000..6b4f30c96b --- /dev/null +++ b/third_party/libwebrtc/modules/audio_coding/codecs/ilbc/filtered_cb_vecs.c @@ -0,0 +1,50 @@ +/* + * 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_FilteredCbVecs.c + +******************************************************************/ + +#include "modules/audio_coding/codecs/ilbc/filtered_cb_vecs.h" + +#include "modules/audio_coding/codecs/ilbc/constants.h" +#include "modules/audio_coding/codecs/ilbc/defines.h" + +/*----------------------------------------------------------------* + * Construct an additional codebook vector by filtering the + * initial codebook buffer. This vector is then used to expand + * the codebook with an additional section. + *---------------------------------------------------------------*/ + +void WebRtcIlbcfix_FilteredCbVecs( + int16_t *cbvectors, /* (o) Codebook vector for the higher section */ + int16_t *CBmem, /* (i) Codebook memory that is filtered to create a + second CB section */ + size_t lMem, /* (i) Length of codebook memory */ + size_t samples /* (i) Number of samples to filter */ + ) { + + /* Set up the memory, start with zero state */ + WebRtcSpl_MemSetW16(CBmem+lMem, 0, CB_HALFFILTERLEN); + WebRtcSpl_MemSetW16(CBmem-CB_HALFFILTERLEN, 0, CB_HALFFILTERLEN); + WebRtcSpl_MemSetW16(cbvectors, 0, lMem-samples); + + /* Filter to obtain the filtered CB memory */ + + WebRtcSpl_FilterMAFastQ12( + CBmem+CB_HALFFILTERLEN+lMem-samples, cbvectors+lMem-samples, + (int16_t*)WebRtcIlbcfix_kCbFiltersRev, CB_FILTERLEN, samples); + + return; +} |