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484 lines
16 KiB
484 lines
16 KiB
/******************************************************************************
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*
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* Copyright 2014 The Android Open Source Project
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* Copyright 2006 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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/** @file
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@ingroup codec_internal
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*/
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/**@addtogroup codec_internal */
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/**@{*/
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#include "oi_bitstream.h"
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#include "oi_codec_sbc_private.h"
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#define SPECIALIZE_READ_SAMPLES_JOINT
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#if __has_attribute(fallthrough)
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#define __fallthrough __attribute__((__fallthrough__))
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#else
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#define __fallthrough
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#endif
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/**
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* Scans through a buffer looking for a codec syncword. If the decoder has been
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* set for enhanced operation using OI_CODEC_SBC_DecoderReset(), it will search
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* for both a standard and an enhanced syncword.
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*/
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PRIVATE OI_STATUS FindSyncword(OI_CODEC_SBC_DECODER_CONTEXT* context,
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const OI_BYTE** frameData,
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uint32_t* frameBytes) {
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#ifdef SBC_ENHANCED
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OI_BYTE search1 = OI_SBC_SYNCWORD;
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OI_BYTE search2 = OI_SBC_ENHANCED_SYNCWORD;
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#endif // SBC_ENHANCED
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if (*frameBytes == 0) {
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return OI_CODEC_SBC_NOT_ENOUGH_HEADER_DATA;
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}
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#ifdef SBC_ENHANCED
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if (context->limitFrameFormat && context->enhancedEnabled) {
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/* If the context is restricted, only search for specified SYNCWORD */
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search1 = search2;
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} else if (context->enhancedEnabled == FALSE) {
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/* If enhanced is not enabled, only search for classic SBC SYNCWORD*/
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search2 = search1;
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}
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while (*frameBytes && (**frameData != search1) && (**frameData != search2)) {
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(*frameBytes)--;
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(*frameData)++;
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}
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if (*frameBytes) {
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/* Syncword found, *frameData points to it, and *frameBytes correctly
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* reflects the number of bytes available to read, including the
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* syncword. */
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context->common.frameInfo.enhanced =
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(**frameData == OI_SBC_ENHANCED_SYNCWORD);
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return OI_OK;
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} else {
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/* No syncword was found anywhere in the provided input data.
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* *frameData points past the end of the original input, and
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* *frameBytes is 0. */
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return OI_CODEC_SBC_NO_SYNCWORD;
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}
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#else // SBC_ENHANCED
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while (*frameBytes && (**frameData != OI_SBC_SYNCWORD)) {
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(*frameBytes)--;
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(*frameData)++;
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}
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if (*frameBytes) {
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/* Syncword found, *frameData points to it, and *frameBytes correctly
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* reflects the number of bytes available to read, including the
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* syncword. */
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context->common.frameInfo.enhanced = FALSE;
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return OI_OK;
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} else {
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/* No syncword was found anywhere in the provided input data.
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* *frameData points past the end of the original input, and
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* *frameBytes is 0. */
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return OI_CODEC_SBC_NO_SYNCWORD;
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}
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#endif // SBC_ENHANCED
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}
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static OI_STATUS DecodeBody(OI_CODEC_SBC_DECODER_CONTEXT* context,
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const OI_BYTE* bodyData, int16_t* pcmData,
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uint32_t* pcmBytes, OI_BOOL allowPartial) {
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OI_BITSTREAM bs;
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OI_UINT frameSamples = context->common.frameInfo.nrof_blocks *
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context->common.frameInfo.nrof_subbands;
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OI_UINT decode_block_count;
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/*
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* Based on the header data, make sure that there is enough room to write the
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* output samples.
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*/
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if (*pcmBytes <
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(sizeof(int16_t) * frameSamples * context->common.pcmStride) &&
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!allowPartial) {
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/* If we're not allowing partial decodes, we need room for the entire
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* codec frame */
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TRACE(("-OI_CODEC_SBC_Decode: OI_CODEC_SBC_NOT_ENOUGH_AUDIO_DATA"));
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return OI_CODEC_SBC_NOT_ENOUGH_AUDIO_DATA;
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} else if (*pcmBytes < sizeof(int16_t) *
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context->common.frameInfo.nrof_subbands *
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context->common.pcmStride) {
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/* Even if we're allowing partials, we can still only decode on a frame
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* boundary */
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return OI_CODEC_SBC_NOT_ENOUGH_AUDIO_DATA;
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}
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if (context->bufferedBlocks == 0) {
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TRACE(("Reading scalefactors"));
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OI_SBC_ReadScalefactors(&context->common, bodyData, &bs);
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TRACE(("Computing bit allocation"));
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OI_SBC_ComputeBitAllocation(&context->common);
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TRACE(("Reading samples"));
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if (context->common.frameInfo.mode == SBC_JOINT_STEREO) {
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OI_SBC_ReadSamplesJoint(context, &bs);
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} else {
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OI_SBC_ReadSamples(context, &bs);
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}
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context->bufferedBlocks = context->common.frameInfo.nrof_blocks;
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}
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if (allowPartial) {
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decode_block_count = *pcmBytes / sizeof(int16_t) /
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context->common.pcmStride /
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context->common.frameInfo.nrof_subbands;
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if (decode_block_count > context->bufferedBlocks) {
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decode_block_count = context->bufferedBlocks;
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}
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} else {
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decode_block_count = context->common.frameInfo.nrof_blocks;
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}
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TRACE(("Synthesizing frame"));
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{
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OI_UINT start_block =
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context->common.frameInfo.nrof_blocks - context->bufferedBlocks;
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OI_SBC_SynthFrame(context, pcmData, start_block, decode_block_count);
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}
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OI_ASSERT(context->bufferedBlocks >= decode_block_count);
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context->bufferedBlocks -= decode_block_count;
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frameSamples = decode_block_count * context->common.frameInfo.nrof_subbands;
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/*
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* When decoding mono into a stride-2 array, copy pcm data to second channel
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*/
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if (context->common.frameInfo.nrof_channels == 1 &&
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context->common.pcmStride == 2) {
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OI_UINT i;
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for (i = 0; i < frameSamples; ++i) {
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pcmData[2 * i + 1] = pcmData[2 * i];
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}
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}
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/*
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* Return number of pcm bytes generated by the decode operation.
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*/
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*pcmBytes = frameSamples * sizeof(int16_t) * context->common.pcmStride;
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if (context->bufferedBlocks > 0) {
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return OI_CODEC_SBC_PARTIAL_DECODE;
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} else {
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return OI_OK;
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}
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}
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PRIVATE OI_STATUS internal_DecodeRaw(OI_CODEC_SBC_DECODER_CONTEXT* context,
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uint8_t bitpool, const OI_BYTE** frameData,
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uint32_t* frameBytes, int16_t* pcmData,
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uint32_t* pcmBytes) {
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OI_STATUS status;
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OI_UINT bodyLen;
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TRACE(("+OI_CODEC_SBC_DecodeRaw"));
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if (context->bufferedBlocks == 0) {
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/*
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* The bitallocator needs to know the bitpool value.
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*/
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context->common.frameInfo.bitpool = bitpool;
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/*
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* Compute the frame length and check we have enough frame data to proceed
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*/
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bodyLen = OI_CODEC_SBC_CalculateFramelen(&context->common.frameInfo) -
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SBC_HEADER_LEN;
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if (*frameBytes < bodyLen) {
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TRACE(("-OI_CODEC_SBC_Decode: OI_CODEC_SBC_NOT_ENOUGH_BODY_DATA"));
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return OI_CODEC_SBC_NOT_ENOUGH_BODY_DATA;
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}
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} else {
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bodyLen = 0;
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}
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/*
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* Decode the SBC data. Pass TRUE to DecodeBody to allow partial decoding of
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* tones.
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*/
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status = DecodeBody(context, *frameData, pcmData, pcmBytes, TRUE);
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if (OI_SUCCESS(status) || status == OI_CODEC_SBC_PARTIAL_DECODE) {
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*frameData += bodyLen;
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*frameBytes -= bodyLen;
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}
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TRACE(("-OI_CODEC_SBC_DecodeRaw: %d", status));
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return status;
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}
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OI_STATUS OI_CODEC_SBC_DecoderReset(OI_CODEC_SBC_DECODER_CONTEXT* context,
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uint32_t* decoderData,
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uint32_t decoderDataBytes,
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uint8_t maxChannels, uint8_t pcmStride,
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OI_BOOL enhanced) {
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return internal_DecoderReset(context, decoderData, decoderDataBytes,
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maxChannels, pcmStride, enhanced);
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}
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OI_STATUS OI_CODEC_SBC_DecodeFrame(OI_CODEC_SBC_DECODER_CONTEXT* context,
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const OI_BYTE** frameData,
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uint32_t* frameBytes, int16_t* pcmData,
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uint32_t* pcmBytes) {
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OI_STATUS status;
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OI_UINT framelen;
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uint8_t crc;
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TRACE(("+OI_CODEC_SBC_DecodeFrame"));
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TRACE(("Finding syncword"));
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status = FindSyncword(context, frameData, frameBytes);
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if (!OI_SUCCESS(status)) {
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return status;
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}
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/* Make sure enough data remains to read the header. */
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if (*frameBytes < SBC_HEADER_LEN) {
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TRACE(("-OI_CODEC_SBC_DecodeFrame: OI_CODEC_SBC_NOT_ENOUGH_HEADER_DATA"));
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return OI_CODEC_SBC_NOT_ENOUGH_HEADER_DATA;
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}
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TRACE(("Reading Header"));
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OI_SBC_ReadHeader(&context->common, *frameData);
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/*
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* Some implementations load the decoder into RAM and use overlays for 4 vs 8
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* subbands. We need
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* to ensure that the SBC parameters for this frame are compatible with the
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* restrictions imposed
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* by the loaded overlays.
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*/
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if (context->limitFrameFormat &&
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(context->common.frameInfo.subbands != context->restrictSubbands)) {
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ERROR(("SBC parameters incompatible with loaded overlay"));
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return OI_STATUS_INVALID_PARAMETERS;
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}
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if (context->common.frameInfo.nrof_channels > context->common.maxChannels) {
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ERROR(
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("SBC parameters incompatible with number of channels specified during "
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"reset"));
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return OI_STATUS_INVALID_PARAMETERS;
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}
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if (context->common.pcmStride < 1 || context->common.pcmStride > 2) {
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ERROR(("PCM stride not set correctly during reset"));
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return OI_STATUS_INVALID_PARAMETERS;
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}
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/*
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* At this point a header has been read. However, it's possible that we found
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* a false syncword,
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* so the header data might be invalid. Make sure we have enough bytes to read
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* in the
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* CRC-protected header, but don't require we have the whole frame. That way,
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* if it turns out
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* that we're acting on bogus header data, we don't stall the decoding process
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* by waiting for
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* data that we don't actually need.
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*/
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framelen = OI_CODEC_SBC_CalculateFramelen(&context->common.frameInfo);
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if (*frameBytes < framelen) {
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TRACE(("-OI_CODEC_SBC_DecodeFrame: OI_CODEC_SBC_NOT_ENOUGH_BODY_DATA"));
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return OI_CODEC_SBC_NOT_ENOUGH_BODY_DATA;
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}
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TRACE(("Calculating checksum"));
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crc = OI_SBC_CalculateChecksum(&context->common.frameInfo, *frameData);
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if (crc != context->common.frameInfo.crc) {
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TRACE(("CRC Mismatch: calc=%02x read=%02x\n", crc,
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context->common.frameInfo.crc));
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TRACE(("-OI_CODEC_SBC_DecodeFrame: OI_CODEC_SBC_CHECKSUM_MISMATCH"));
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return OI_CODEC_SBC_CHECKSUM_MISMATCH;
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}
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/*
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* Make sure the bitpool values are sane.
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*/
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if ((context->common.frameInfo.bitpool < SBC_MIN_BITPOOL) &&
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!context->common.frameInfo.enhanced) {
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ERROR(("Bitpool too small: %d (must be >= 2)",
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context->common.frameInfo.bitpool));
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return OI_STATUS_INVALID_PARAMETERS;
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}
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if (context->common.frameInfo.bitpool >
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OI_SBC_MaxBitpool(&context->common.frameInfo)) {
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ERROR(("Bitpool too large: %d (must be <= %ld)",
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context->common.frameInfo.bitpool,
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OI_SBC_MaxBitpool(&context->common.frameInfo)));
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return OI_STATUS_INVALID_PARAMETERS;
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}
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/*
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* Now decode the SBC data. Partial decode is not yet implemented for an SBC
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* stream, so pass FALSE to decode body to have it enforce the old rule that
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* you have to decode a whole packet at a time.
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*/
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status = DecodeBody(context, *frameData + SBC_HEADER_LEN, pcmData, pcmBytes,
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FALSE);
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if (OI_SUCCESS(status)) {
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*frameData += framelen;
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*frameBytes -= framelen;
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}
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TRACE(("-OI_CODEC_SBC_DecodeFrame: %d", status));
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return status;
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}
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OI_STATUS OI_CODEC_SBC_SkipFrame(OI_CODEC_SBC_DECODER_CONTEXT* context,
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const OI_BYTE** frameData,
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uint32_t* frameBytes) {
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OI_STATUS status;
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OI_UINT framelen;
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OI_UINT headerlen;
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uint8_t crc;
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status = FindSyncword(context, frameData, frameBytes);
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if (!OI_SUCCESS(status)) {
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return status;
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}
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if (*frameBytes < SBC_HEADER_LEN) {
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return OI_CODEC_SBC_NOT_ENOUGH_HEADER_DATA;
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}
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OI_SBC_ReadHeader(&context->common, *frameData);
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framelen =
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OI_SBC_CalculateFrameAndHeaderlen(&context->common.frameInfo, &headerlen);
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if (*frameBytes < headerlen) {
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return OI_CODEC_SBC_NOT_ENOUGH_HEADER_DATA;
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}
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crc = OI_SBC_CalculateChecksum(&context->common.frameInfo, *frameData);
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if (crc != context->common.frameInfo.crc) {
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return OI_CODEC_SBC_CHECKSUM_MISMATCH;
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}
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if (*frameBytes < framelen) {
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return OI_CODEC_SBC_NOT_ENOUGH_BODY_DATA;
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}
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context->bufferedBlocks = 0;
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*frameData += framelen;
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*frameBytes -= framelen;
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return OI_OK;
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}
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uint8_t OI_CODEC_SBC_FrameCount(OI_BYTE* frameData, uint32_t frameBytes) {
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uint8_t mode;
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uint8_t blocks;
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uint8_t subbands;
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uint8_t frameCount = 0;
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OI_UINT frameLen;
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while (frameBytes) {
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while (frameBytes && ((frameData[0] & 0xFE) != 0x9C)) {
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frameData++;
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frameBytes--;
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}
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if (frameBytes < SBC_HEADER_LEN) {
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return frameCount;
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}
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/* Extract and translate required fields from Header */
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subbands = mode = blocks = frameData[1];
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;
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mode = (mode & (BIT3 | BIT2)) >> 2;
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blocks = block_values[(blocks & (BIT5 | BIT4)) >> 4];
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subbands = band_values[(subbands & BIT0)];
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/* Inline logic to avoid corrupting context */
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frameLen = blocks * frameData[2];
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switch (mode) {
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case SBC_JOINT_STEREO:
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frameLen += subbands + (8 * subbands);
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break;
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case SBC_DUAL_CHANNEL:
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frameLen *= 2;
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__fallthrough;
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default:
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if (mode == SBC_MONO) {
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frameLen += 4 * subbands;
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} else {
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frameLen += 8 * subbands;
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}
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}
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frameCount++;
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frameLen = SBC_HEADER_LEN + (frameLen + 7) / 8;
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if (frameBytes > frameLen) {
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frameBytes -= frameLen;
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frameData += frameLen;
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} else {
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frameBytes = 0;
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}
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}
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return frameCount;
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}
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/** Read quantized subband samples from the input bitstream and expand them. */
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#ifdef SPECIALIZE_READ_SAMPLES_JOINT
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PRIVATE void OI_SBC_ReadSamplesJoint4(OI_CODEC_SBC_DECODER_CONTEXT* context,
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OI_BITSTREAM* global_bs) {
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#define NROF_SUBBANDS 4
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#include "readsamplesjoint.inc"
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#undef NROF_SUBBANDS
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}
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PRIVATE void OI_SBC_ReadSamplesJoint8(OI_CODEC_SBC_DECODER_CONTEXT* context,
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OI_BITSTREAM* global_bs) {
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#define NROF_SUBBANDS 8
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#include "readsamplesjoint.inc"
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#undef NROF_SUBBANDS
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}
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typedef void (*READ_SAMPLES)(OI_CODEC_SBC_DECODER_CONTEXT* context,
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OI_BITSTREAM* global_bs);
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static const READ_SAMPLES SpecializedReadSamples[] = {OI_SBC_ReadSamplesJoint4,
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OI_SBC_ReadSamplesJoint8};
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#endif /* SPECIALIZE_READ_SAMPLES_JOINT */
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PRIVATE void OI_SBC_ReadSamplesJoint(OI_CODEC_SBC_DECODER_CONTEXT* context,
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OI_BITSTREAM* global_bs) {
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OI_CODEC_SBC_COMMON_CONTEXT* common = &context->common;
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OI_UINT nrof_subbands = common->frameInfo.nrof_subbands;
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#ifdef SPECIALIZE_READ_SAMPLES_JOINT
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OI_ASSERT((nrof_subbands >> 3u) <= 1u);
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SpecializedReadSamples[nrof_subbands >> 3](context, global_bs);
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#else
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#define NROF_SUBBANDS nrof_subbands
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#include "readsamplesjoint.inc"
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#undef NROF_SUBBANDS
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#endif /* SPECIALIZE_READ_SAMPLES_JOINT */
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}
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/**@}*/
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