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Diffstat (limited to 'src/common_audio/signal_processing_library/main/source/resample_48khz.c')
| -rw-r--r-- | src/common_audio/signal_processing_library/main/source/resample_48khz.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/src/common_audio/signal_processing_library/main/source/resample_48khz.c b/src/common_audio/signal_processing_library/main/source/resample_48khz.c new file mode 100644 index 0000000000..31cbe6b6a9 --- /dev/null +++ b/src/common_audio/signal_processing_library/main/source/resample_48khz.c @@ -0,0 +1,186 @@ +/* + * 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. + */ + + +/* + * This file contains resampling functions between 48 kHz and nb/wb. + * The description header can be found in signal_processing_library.h + * + */ + +#include <string.h> +#include "signal_processing_library.h" +#include "resample_by_2_internal.h" + +//////////////////////////// +///// 48 kHz -> 16 kHz ///// +//////////////////////////// + +// 48 -> 16 resampler +void WebRtcSpl_Resample48khzTo16khz(const WebRtc_Word16* in, WebRtc_Word16* out, + WebRtcSpl_State48khzTo16khz* state, WebRtc_Word32* tmpmem) +{ + ///// 48 --> 48(LP) ///// + // WebRtc_Word16 in[480] + // WebRtc_Word32 out[480] + ///// + WebRtcSpl_LPBy2ShortToInt(in, 480, tmpmem + 16, state->S_48_48); + + ///// 48 --> 32 ///// + // WebRtc_Word32 in[480] + // WebRtc_Word32 out[320] + ///// + // copy state to and from input array + memcpy(tmpmem + 8, state->S_48_32, 8 * sizeof(WebRtc_Word32)); + memcpy(state->S_48_32, tmpmem + 488, 8 * sizeof(WebRtc_Word32)); + WebRtcSpl_Resample48khzTo32khz(tmpmem + 8, tmpmem, 160); + + ///// 32 --> 16 ///// + // WebRtc_Word32 in[320] + // WebRtc_Word16 out[160] + ///// + WebRtcSpl_DownBy2IntToShort(tmpmem, 320, out, state->S_32_16); +} + +// initialize state of 48 -> 16 resampler +void WebRtcSpl_ResetResample48khzTo16khz(WebRtcSpl_State48khzTo16khz* state) +{ + memset(state->S_48_48, 0, 16 * sizeof(WebRtc_Word32)); + memset(state->S_48_32, 0, 8 * sizeof(WebRtc_Word32)); + memset(state->S_32_16, 0, 8 * sizeof(WebRtc_Word32)); +} + +//////////////////////////// +///// 16 kHz -> 48 kHz ///// +//////////////////////////// + +// 16 -> 48 resampler +void WebRtcSpl_Resample16khzTo48khz(const WebRtc_Word16* in, WebRtc_Word16* out, + WebRtcSpl_State16khzTo48khz* state, WebRtc_Word32* tmpmem) +{ + ///// 16 --> 32 ///// + // WebRtc_Word16 in[160] + // WebRtc_Word32 out[320] + ///// + WebRtcSpl_UpBy2ShortToInt(in, 160, tmpmem + 16, state->S_16_32); + + ///// 32 --> 24 ///// + // WebRtc_Word32 in[320] + // WebRtc_Word32 out[240] + // copy state to and from input array + ///// + memcpy(tmpmem + 8, state->S_32_24, 8 * sizeof(WebRtc_Word32)); + memcpy(state->S_32_24, tmpmem + 328, 8 * sizeof(WebRtc_Word32)); + WebRtcSpl_Resample32khzTo24khz(tmpmem + 8, tmpmem, 80); + + ///// 24 --> 48 ///// + // WebRtc_Word32 in[240] + // WebRtc_Word16 out[480] + ///// + WebRtcSpl_UpBy2IntToShort(tmpmem, 240, out, state->S_24_48); +} + +// initialize state of 16 -> 48 resampler +void WebRtcSpl_ResetResample16khzTo48khz(WebRtcSpl_State16khzTo48khz* state) +{ + memset(state->S_16_32, 0, 8 * sizeof(WebRtc_Word32)); + memset(state->S_32_24, 0, 8 * sizeof(WebRtc_Word32)); + memset(state->S_24_48, 0, 8 * sizeof(WebRtc_Word32)); +} + +//////////////////////////// +///// 48 kHz -> 8 kHz ///// +//////////////////////////// + +// 48 -> 8 resampler +void WebRtcSpl_Resample48khzTo8khz(const WebRtc_Word16* in, WebRtc_Word16* out, + WebRtcSpl_State48khzTo8khz* state, WebRtc_Word32* tmpmem) +{ + ///// 48 --> 24 ///// + // WebRtc_Word16 in[480] + // WebRtc_Word32 out[240] + ///// + WebRtcSpl_DownBy2ShortToInt(in, 480, tmpmem + 256, state->S_48_24); + + ///// 24 --> 24(LP) ///// + // WebRtc_Word32 in[240] + // WebRtc_Word32 out[240] + ///// + WebRtcSpl_LPBy2IntToInt(tmpmem + 256, 240, tmpmem + 16, state->S_24_24); + + ///// 24 --> 16 ///// + // WebRtc_Word32 in[240] + // WebRtc_Word32 out[160] + ///// + // copy state to and from input array + memcpy(tmpmem + 8, state->S_24_16, 8 * sizeof(WebRtc_Word32)); + memcpy(state->S_24_16, tmpmem + 248, 8 * sizeof(WebRtc_Word32)); + WebRtcSpl_Resample48khzTo32khz(tmpmem + 8, tmpmem, 80); + + ///// 16 --> 8 ///// + // WebRtc_Word32 in[160] + // WebRtc_Word16 out[80] + ///// + WebRtcSpl_DownBy2IntToShort(tmpmem, 160, out, state->S_16_8); +} + +// initialize state of 48 -> 8 resampler +void WebRtcSpl_ResetResample48khzTo8khz(WebRtcSpl_State48khzTo8khz* state) +{ + memset(state->S_48_24, 0, 8 * sizeof(WebRtc_Word32)); + memset(state->S_24_24, 0, 16 * sizeof(WebRtc_Word32)); + memset(state->S_24_16, 0, 8 * sizeof(WebRtc_Word32)); + memset(state->S_16_8, 0, 8 * sizeof(WebRtc_Word32)); +} + +//////////////////////////// +///// 8 kHz -> 48 kHz ///// +//////////////////////////// + +// 8 -> 48 resampler +void WebRtcSpl_Resample8khzTo48khz(const WebRtc_Word16* in, WebRtc_Word16* out, + WebRtcSpl_State8khzTo48khz* state, WebRtc_Word32* tmpmem) +{ + ///// 8 --> 16 ///// + // WebRtc_Word16 in[80] + // WebRtc_Word32 out[160] + ///// + WebRtcSpl_UpBy2ShortToInt(in, 80, tmpmem + 264, state->S_8_16); + + ///// 16 --> 12 ///// + // WebRtc_Word32 in[160] + // WebRtc_Word32 out[120] + ///// + // copy state to and from input array + memcpy(tmpmem + 256, state->S_16_12, 8 * sizeof(WebRtc_Word32)); + memcpy(state->S_16_12, tmpmem + 416, 8 * sizeof(WebRtc_Word32)); + WebRtcSpl_Resample32khzTo24khz(tmpmem + 256, tmpmem + 240, 40); + + ///// 12 --> 24 ///// + // WebRtc_Word32 in[120] + // WebRtc_Word16 out[240] + ///// + WebRtcSpl_UpBy2IntToInt(tmpmem + 240, 120, tmpmem, state->S_12_24); + + ///// 24 --> 48 ///// + // WebRtc_Word32 in[240] + // WebRtc_Word16 out[480] + ///// + WebRtcSpl_UpBy2IntToShort(tmpmem, 240, out, state->S_24_48); +} + +// initialize state of 8 -> 48 resampler +void WebRtcSpl_ResetResample8khzTo48khz(WebRtcSpl_State8khzTo48khz* state) +{ + memset(state->S_8_16, 0, 8 * sizeof(WebRtc_Word32)); + memset(state->S_16_12, 0, 8 * sizeof(WebRtc_Word32)); + memset(state->S_12_24, 0, 8 * sizeof(WebRtc_Word32)); + memset(state->S_24_48, 0, 8 * sizeof(WebRtc_Word32)); +} |