485 lines
18 KiB
C
485 lines
18 KiB
C
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/******************************************************************************
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*
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* Copyright (C) 2014 The Android Open Source Project
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* Copyright 2003 - 2004 Open Interface North America, Inc. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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******************************************************************************/
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/**********************************************************************************
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$Revision: #1 $
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***********************************************************************************/
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#ifndef _OI_CODEC_SBC_CORE_H
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#define _OI_CODEC_SBC_CORE_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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@file
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Declarations of codec functions, data types, and macros.
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@ingroup codec_lib
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*/
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/**
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@addtogroup codec_lib
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@{
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*/
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/* Non-BM3 users of of the codec must include oi_codec_sbc_bm3defs.h prior to
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* including this file, or else these includes will fail because the BM3 SDK is
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* not in the include path */
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#ifndef _OI_CODEC_SBC_BM3DEFS_H
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#include "oi_stddefs.h"
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#include "oi_status.h"
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#endif
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#include <stdint.h>
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#define SBC_MAX_CHANNELS 2
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#define SBC_MAX_BANDS 8
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#define SBC_MAX_BLOCKS 16
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#define SBC_MIN_BITPOOL 2 /**< Minimum size of the bit allocation pool used to encode the stream */
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#define SBC_MAX_BITPOOL 250 /**< Maximum size of the bit allocation pool used to encode the stream */
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#define SBC_MAX_ONE_CHANNEL_BPS 320000
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#define SBC_MAX_TWO_CHANNEL_BPS 512000
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#define SBC_WBS_BITRATE 62000
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#define SBC_WBS_BITPOOL 27
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#define SBC_WBS_NROF_BLOCKS 16
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#define SBC_WBS_FRAME_LEN 62
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#define SBC_WBS_SAMPLES_PER_FRAME 128
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#define SBC_HEADER_LEN 4
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#define SBC_MAX_FRAME_LEN (SBC_HEADER_LEN + \
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((SBC_MAX_BANDS * SBC_MAX_CHANNELS / 2) + \
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(SBC_MAX_BANDS + SBC_MAX_BLOCKS * SBC_MAX_BITPOOL + 7)/8))
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#define SBC_MAX_SAMPLES_PER_FRAME (SBC_MAX_BANDS * SBC_MAX_BLOCKS)
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#define SBC_MAX_SCALEFACTOR_BYTES ((4*(SBC_MAX_CHANNELS * SBC_MAX_BANDS) + 7)/8)
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#define OI_SBC_SYNCWORD 0x9c
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#define OI_SBC_ENHANCED_SYNCWORD 0x9d
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/**@name Sampling frequencies */
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/**@{*/
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#define SBC_FREQ_16000 0 /**< The sampling frequency is 16 kHz. One possible value for the @a frequency parameter of OI_CODEC_SBC_EncoderConfigure() */
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#define SBC_FREQ_32000 1 /**< The sampling frequency is 32 kHz. One possible value for the @a frequency parameter of OI_CODEC_SBC_EncoderConfigure() */
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#define SBC_FREQ_44100 2 /**< The sampling frequency is 44.1 kHz. One possible value for the @a frequency parameter of OI_CODEC_SBC_EncoderConfigure() */
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#define SBC_FREQ_48000 3 /**< The sampling frequency is 48 kHz. One possible value for the @a frequency parameter of OI_CODEC_SBC_EncoderConfigure() */
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/**@}*/
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/**@name Channel modes */
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/**@{*/
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#define SBC_MONO 0 /**< The mode of the encoded channel is mono. One possible value for the @a mode parameter of OI_CODEC_SBC_EncoderConfigure() */
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#define SBC_DUAL_CHANNEL 1 /**< The mode of the encoded channel is dual-channel. One possible value for the @a mode parameter of OI_CODEC_SBC_EncoderConfigure() */
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#define SBC_STEREO 2 /**< The mode of the encoded channel is stereo. One possible value for the @a mode parameter of OI_CODEC_SBC_EncoderConfigure() */
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#define SBC_JOINT_STEREO 3 /**< The mode of the encoded channel is joint stereo. One possible value for the @a mode parameter of OI_CODEC_SBC_EncoderConfigure() */
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/**@}*/
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/**@name Subbands */
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/**@{*/
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#define SBC_SUBBANDS_4 0 /**< The encoded stream has 4 subbands. One possible value for the @a subbands parameter of OI_CODEC_SBC_EncoderConfigure()*/
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#define SBC_SUBBANDS_8 1 /**< The encoded stream has 8 subbands. One possible value for the @a subbands parameter of OI_CODEC_SBC_EncoderConfigure() */
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/**@}*/
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/**@name Block lengths */
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/**@{*/
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#define SBC_BLOCKS_4 0 /**< A block size of 4 blocks was used to encode the stream. One possible value for the @a blocks parameter of OI_CODEC_SBC_EncoderConfigure() */
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#define SBC_BLOCKS_8 1 /**< A block size of 8 blocks was used to encode the stream is. One possible value for the @a blocks parameter of OI_CODEC_SBC_EncoderConfigure() */
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#define SBC_BLOCKS_12 2 /**< A block size of 12 blocks was used to encode the stream. One possible value for the @a blocks parameter of OI_CODEC_SBC_EncoderConfigure() */
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#define SBC_BLOCKS_16 3 /**< A block size of 16 blocks was used to encode the stream. One possible value for the @a blocks parameter of OI_CODEC_SBC_EncoderConfigure() */
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/**@}*/
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/**@name Bit allocation methods */
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/**@{*/
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#define SBC_LOUDNESS 0 /**< The bit allocation method. One possible value for the @a loudness parameter of OI_CODEC_SBC_EncoderConfigure() */
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#define SBC_SNR 1 /**< The bit allocation method. One possible value for the @a loudness parameter of OI_CODEC_SBC_EncoderConfigure() */
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/**@}*/
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/**
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@}
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@addtogroup codec_internal
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@{
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*/
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typedef OI_INT16 SBC_BUFFER_T;
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/** Used internally. */
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typedef struct {
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OI_UINT16 frequency; /**< The sampling frequency. Input parameter. */
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OI_UINT8 freqIndex;
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OI_UINT8 nrof_blocks; /**< The block size used to encode the stream. Input parameter. */
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OI_UINT8 blocks;
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OI_UINT8 nrof_subbands; /**< The number of subbands of the encoded stream. Input parameter. */
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OI_UINT8 subbands;
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OI_UINT8 mode; /**< The mode of the encoded channel. Input parameter. */
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OI_UINT8 nrof_channels; /**< The number of channels of the encoded stream. */
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OI_UINT8 alloc; /**< The bit allocation method. Input parameter. */
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OI_UINT8 bitpool; /**< Size of the bit allocation pool used to encode the stream. Input parameter. */
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OI_UINT8 crc; /**< Parity check byte used for error detection. */
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OI_UINT8 join; /**< Whether joint stereo has been used. */
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OI_UINT8 enhanced;
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OI_UINT8 min_bitpool; /**< This value is only used when encoding. SBC_MAX_BITPOOL if variable
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bitpools are disallowed, otherwise the minimum bitpool size that will
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be used by the bit allocator. */
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OI_UINT8 cachedInfo; /**< Information about the previous frame */
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} OI_CODEC_SBC_FRAME_INFO;
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/** Used internally. */
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typedef struct {
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const OI_CHAR *codecInfo;
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OI_CODEC_SBC_FRAME_INFO frameInfo;
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OI_INT8 scale_factor[SBC_MAX_CHANNELS * SBC_MAX_BANDS];
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OI_UINT32 frameCount;
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OI_INT32 *subdata;
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SBC_BUFFER_T *filterBuffer[SBC_MAX_CHANNELS];
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OI_INT32 filterBufferLen;
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OI_UINT filterBufferOffset;
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union {
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OI_UINT8 uint8[SBC_MAX_CHANNELS * SBC_MAX_BANDS];
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OI_UINT32 uint32[SBC_MAX_CHANNELS * SBC_MAX_BANDS / 4];
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} bits;
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OI_UINT8 maxBitneed; /**< Running maximum bitneed */
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OI_BYTE formatByte;
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OI_UINT8 pcmStride;
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OI_UINT8 maxChannels;
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} OI_CODEC_SBC_COMMON_CONTEXT;
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/*
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* A smaller value reduces RAM usage at the expense of increased CPU usage. Values in the range
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* 27..50 are recommended, beyond 50 there is a diminishing return on reduced CPU usage.
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*/
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#define SBC_CODEC_MIN_FILTER_BUFFERS 16
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#define SBC_CODEC_FAST_FILTER_BUFFERS 27
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/* Expands to the number of OI_UINT32s needed to ensure enough memory to encode
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* or decode streams of numChannels channels, using numBuffers buffers.
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* Example:
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* OI_UINT32 decoderData[CODEC_DATA_WORDS(SBC_MAX_CHANNELS, SBC_DECODER_FAST_SYNTHESIS_BUFFERS)];
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* */
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#define CODEC_DATA_WORDS(numChannels, numBuffers) \
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((\
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(sizeof(OI_INT32) * SBC_MAX_BLOCKS * numChannels * SBC_MAX_BANDS) \
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+ (sizeof(SBC_BUFFER_T) * SBC_MAX_CHANNELS * SBC_MAX_BANDS * numBuffers) \
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+ (sizeof (OI_UINT32) - 1) \
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) / sizeof(OI_UINT32))
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/** Opaque parameter to decoding functions; maintains decoder context. */
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typedef struct {
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OI_CODEC_SBC_COMMON_CONTEXT common;
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OI_UINT8 limitFrameFormat; /* Boolean, set by OI_CODEC_SBC_DecoderLimit() */
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OI_UINT8 restrictSubbands;
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OI_UINT8 enhancedEnabled;
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OI_UINT8 bufferedBlocks;
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} OI_CODEC_SBC_DECODER_CONTEXT;
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typedef struct {
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OI_UINT32 data[CODEC_DATA_WORDS(1, SBC_CODEC_FAST_FILTER_BUFFERS)];
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} OI_CODEC_SBC_CODEC_DATA_MONO;
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typedef struct {
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OI_UINT32 data[CODEC_DATA_WORDS(2, SBC_CODEC_FAST_FILTER_BUFFERS)];
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} OI_CODEC_SBC_CODEC_DATA_STEREO;
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/**
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@}
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@addtogroup codec_lib
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@{
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*/
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/**
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* This function resets the decoder. The context must be reset when
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* changing streams, or if the following stream parameters change:
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* number of subbands, stereo mode, or frequency.
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*
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* @param context Pointer to the decoder context structure to be reset.
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*
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* @param enhanced If true, enhanced SBC operation is enabled. If enabled,
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* the codec will recognize the alternative syncword for
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* decoding an enhanced SBC stream. Enhancements should not
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* be enabled unless the stream is known to be generated
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* by an enhanced encoder, or there is a small possibility
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* for decoding glitches if synchronization were to be lost.
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*/
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OI_STATUS OI_CODEC_SBC_DecoderReset(OI_CODEC_SBC_DECODER_CONTEXT *context,
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OI_UINT32 *decoderData,
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OI_UINT32 decoderDataBytes,
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OI_UINT8 maxChannels,
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OI_UINT8 pcmStride,
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OI_BOOL enhanced);
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/**
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* This function restricts the kind of SBC frames that the Decoder will
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* process. Its use is optional. If used, it must be called after
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* calling OI_CODEC_SBC_DecoderReset(). After it is called, any calls
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* to OI_CODEC_SBC_DecodeFrame() with SBC frames that do not conform
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* to the Subband and Enhanced SBC setting will be rejected with an
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* OI_STATUS_INVALID_PARAMETERS return.
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*
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* @param context Pointer to the decoder context structure to be limited.
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*
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* @param enhanced If true, all frames passed to the decoder must be
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* Enhanced SBC frames. If false, all frames must be
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* standard SBC frames.
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*
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* @param subbands May be set to SBC_SUBBANDS_4 or SBC_SUBBANDS_8. All
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* frames passed to the decoder must be encoded with
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* the requested number of subbands.
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*
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*/
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OI_STATUS OI_CODEC_SBC_DecoderLimit(OI_CODEC_SBC_DECODER_CONTEXT *context,
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OI_BOOL enhanced,
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OI_UINT8 subbands);
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/**
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* This function sets the decoder parameters for a raw decode where the decoder parameters are not
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* available in the sbc data stream. OI_CODEC_SBC_DecoderReset must be called
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* prior to calling this function.
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*
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* @param context Decoder context structure. This must be the context must be
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* used each time a frame is decoded.
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*
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* @param enhanced Set to TRUE to enable Qualcomm proprietary
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* quality enhancements.
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*
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* @param frequency One of SBC_FREQ_16000, SBC_FREQ_32000, SBC_FREQ_44100,
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* SBC_FREQ_48000
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*
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* @param mode One of SBC_MONO, SBC_DUAL_CHANNEL, SBC_STEREO,
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* SBC_JOINT_STEREO
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*
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* @param subbands One of SBC_SUBBANDS_4, SBC_SUBBANDS_8
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*
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* @param blocks One of SBC_BLOCKS_4, SBC_BLOCKS_8, SBC_BLOCKS_12,
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* SBC_BLOCKS_16
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*
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* @param alloc One of SBC_LOUDNESS, SBC_SNR
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*
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* @param maxBitpool The maximum bitpool size for this context
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*/
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OI_STATUS OI_CODEC_SBC_DecoderConfigureRaw(OI_CODEC_SBC_DECODER_CONTEXT *context,
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OI_BOOL enhanced,
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OI_UINT8 frequency,
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OI_UINT8 mode,
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OI_UINT8 subbands,
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OI_UINT8 blocks,
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OI_UINT8 alloc,
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OI_UINT8 maxBitpool);
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/**
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* Decode one SBC frame. The frame has no header bytes. The context must have been previously
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* initialized by calling OI_CODEC_SBC_DecoderConfigureRaw().
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*
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* @param context Pointer to a decoder context structure. The same context
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* must be used each time when decoding from the same stream.
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*
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* @param bitpool The actual bitpool size for this frame. Must be <= the maxbitpool specified
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* in the call to OI_CODEC_SBC_DecoderConfigureRaw(),
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*
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* @param frameData Address of a pointer to the SBC data to decode. This
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* value will be updated to point to the next frame after
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* successful decoding.
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*
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* @param frameBytes Pointer to a UINT32 containing the number of available
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* bytes of frame data. This value will be updated to reflect
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* the number of bytes remaining after a decoding operation.
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*
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* @param pcmData Address of an array of OI_INT16 pairs, which will be
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* populated with the decoded audio data. This address
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* is not updated.
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*
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* @param pcmBytes Pointer to a UINT32 in/out parameter. On input, it
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* should contain the number of bytes available for pcm
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* data. On output, it will contain the number of bytes
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* written. Note that this differs from the semantics of
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* frameBytes.
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*/
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OI_STATUS OI_CODEC_SBC_DecodeRaw(OI_CODEC_SBC_DECODER_CONTEXT *context,
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OI_UINT8 bitpool,
|
||
|
|
const OI_BYTE **frameData,
|
||
|
|
OI_UINT32 *frameBytes,
|
||
|
|
OI_INT16 *pcmData,
|
||
|
|
OI_UINT32 *pcmBytes);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Decode one SBC frame.
|
||
|
|
*
|
||
|
|
* @param context Pointer to a decoder context structure. The same context
|
||
|
|
* must be used each time when decoding from the same stream.
|
||
|
|
*
|
||
|
|
* @param frameData Address of a pointer to the SBC data to decode. This
|
||
|
|
* value will be updated to point to the next frame after
|
||
|
|
* successful decoding.
|
||
|
|
*
|
||
|
|
* @param frameBytes Pointer to a UINT32 containing the number of available
|
||
|
|
* bytes of frame data. This value will be updated to reflect
|
||
|
|
* the number of bytes remaining after a decoding operation.
|
||
|
|
*
|
||
|
|
* @param pcmData Address of an array of OI_INT16 pairs, which will be
|
||
|
|
* populated with the decoded audio data. This address
|
||
|
|
* is not updated.
|
||
|
|
*
|
||
|
|
* @param pcmBytes Pointer to a UINT32 in/out parameter. On input, it
|
||
|
|
* should contain the number of bytes available for pcm
|
||
|
|
* data. On output, it will contain the number of bytes
|
||
|
|
* written. Note that this differs from the semantics of
|
||
|
|
* frameBytes.
|
||
|
|
*/
|
||
|
|
OI_STATUS OI_CODEC_SBC_DecodeFrame(OI_CODEC_SBC_DECODER_CONTEXT *context,
|
||
|
|
const OI_BYTE **frameData,
|
||
|
|
OI_UINT32 *frameBytes,
|
||
|
|
OI_INT16 *pcmData,
|
||
|
|
OI_UINT32 *pcmBytes);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Calculate the number of SBC frames but don't decode. CRC's are not checked,
|
||
|
|
* but the Sync word is found prior to count calculation.
|
||
|
|
*
|
||
|
|
* @param frameData Pointer to the SBC data.
|
||
|
|
*
|
||
|
|
* @param frameBytes Number of bytes avaiable in the frameData buffer
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
OI_UINT8 OI_CODEC_SBC_FrameCount(OI_BYTE *frameData,
|
||
|
|
OI_UINT32 frameBytes);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Analyze an SBC frame but don't do the decode.
|
||
|
|
*
|
||
|
|
* @param context Pointer to a decoder context structure. The same context
|
||
|
|
* must be used each time when decoding from the same stream.
|
||
|
|
*
|
||
|
|
* @param frameData Address of a pointer to the SBC data to decode. This
|
||
|
|
* value will be updated to point to the next frame after
|
||
|
|
* successful decoding.
|
||
|
|
*
|
||
|
|
* @param frameBytes Pointer to a UINT32 containing the number of available
|
||
|
|
* bytes of frame data. This value will be updated to reflect
|
||
|
|
* the number of bytes remaining after a decoding operation.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
OI_STATUS OI_CODEC_SBC_SkipFrame(OI_CODEC_SBC_DECODER_CONTEXT *context,
|
||
|
|
const OI_BYTE **frameData,
|
||
|
|
OI_UINT32 *frameBytes);
|
||
|
|
|
||
|
|
/* Common functions */
|
||
|
|
|
||
|
|
/**
|
||
|
|
Calculate the frame length.
|
||
|
|
|
||
|
|
@param frame The frame whose length to calculate
|
||
|
|
|
||
|
|
@return the length of an individual encoded frame in
|
||
|
|
bytes
|
||
|
|
*/
|
||
|
|
OI_UINT16 OI_CODEC_SBC_CalculateFramelen(OI_CODEC_SBC_FRAME_INFO *frame);
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Calculate the maximum bitpool size that fits within a given frame length.
|
||
|
|
*
|
||
|
|
* @param frame The frame to calculate the bitpool size for
|
||
|
|
* @param frameLen The frame length to fit the bitpool to
|
||
|
|
*
|
||
|
|
* @return the maximum bitpool that will fit in the specified frame length
|
||
|
|
*/
|
||
|
|
OI_UINT16 OI_CODEC_SBC_CalculateBitpool(OI_CODEC_SBC_FRAME_INFO *frame,
|
||
|
|
OI_UINT16 frameLen);
|
||
|
|
|
||
|
|
/**
|
||
|
|
Calculate the bit rate.
|
||
|
|
|
||
|
|
@param frame The frame whose bit rate to calculate
|
||
|
|
|
||
|
|
@return the approximate bit rate in bits per second,
|
||
|
|
assuming that stream parameters are constant
|
||
|
|
*/
|
||
|
|
OI_UINT32 OI_CODEC_SBC_CalculateBitrate(OI_CODEC_SBC_FRAME_INFO *frame);
|
||
|
|
|
||
|
|
/**
|
||
|
|
Calculate decoded audio data length for one frame.
|
||
|
|
|
||
|
|
@param frame The frame whose audio data length to calculate
|
||
|
|
|
||
|
|
@return length of decoded audio data for a
|
||
|
|
single frame, in bytes
|
||
|
|
*/
|
||
|
|
OI_UINT16 OI_CODEC_SBC_CalculatePcmBytes(OI_CODEC_SBC_COMMON_CONTEXT *common);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Get the codec version text.
|
||
|
|
*
|
||
|
|
* @return pointer to text string containing codec version text
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
OI_CHAR *OI_CODEC_Version(void);
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
@}
|
||
|
|
|
||
|
|
@addtogroup codec_internal
|
||
|
|
@{
|
||
|
|
*/
|
||
|
|
|
||
|
|
extern const OI_CHAR *const OI_CODEC_SBC_FreqText[];
|
||
|
|
extern const OI_CHAR *const OI_CODEC_SBC_ModeText[];
|
||
|
|
extern const OI_CHAR *const OI_CODEC_SBC_SubbandsText[];
|
||
|
|
extern const OI_CHAR *const OI_CODEC_SBC_BlocksText[];
|
||
|
|
extern const OI_CHAR *const OI_CODEC_SBC_AllocText[];
|
||
|
|
|
||
|
|
/**
|
||
|
|
@}
|
||
|
|
|
||
|
|
@addtogroup codec_lib
|
||
|
|
@{
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifdef OI_DEBUG
|
||
|
|
void OI_CODEC_SBC_DumpConfig(OI_CODEC_SBC_FRAME_INFO *frameInfo);
|
||
|
|
#else
|
||
|
|
#define OI_CODEC_SBC_DumpConfig(f)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/**
|
||
|
|
@}
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
#endif /* _OI_CODEC_SBC_CORE_H */
|
||
|
|
|
||
|
|
|