484 lines
16 KiB
C
484 lines
16 KiB
C
/******************************************************************************
|
|
*
|
|
* Copyright 2014 The Android Open Source Project
|
|
* Copyright 2006 Open Interface North America, Inc. All rights reserved.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at:
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*
|
|
******************************************************************************/
|
|
|
|
/*******************************************************************************
|
|
$Revision: #1 $
|
|
******************************************************************************/
|
|
|
|
/** @file
|
|
@ingroup codec_internal
|
|
*/
|
|
|
|
/**@addtogroup codec_internal */
|
|
/**@{*/
|
|
|
|
#include "oi_bitstream.h"
|
|
#include "oi_codec_sbc_private.h"
|
|
|
|
#define SPECIALIZE_READ_SAMPLES_JOINT
|
|
|
|
#if __has_attribute(fallthrough)
|
|
#define __fallthrough __attribute__((__fallthrough__))
|
|
#else
|
|
#define __fallthrough
|
|
#endif
|
|
|
|
/**
|
|
* Scans through a buffer looking for a codec syncword. If the decoder has been
|
|
* set for enhanced operation using OI_CODEC_SBC_DecoderReset(), it will search
|
|
* for both a standard and an enhanced syncword.
|
|
*/
|
|
PRIVATE OI_STATUS FindSyncword(OI_CODEC_SBC_DECODER_CONTEXT* context,
|
|
const OI_BYTE** frameData,
|
|
uint32_t* frameBytes) {
|
|
#ifdef SBC_ENHANCED
|
|
OI_BYTE search1 = OI_SBC_SYNCWORD;
|
|
OI_BYTE search2 = OI_SBC_ENHANCED_SYNCWORD;
|
|
#endif // SBC_ENHANCED
|
|
|
|
if (*frameBytes == 0) {
|
|
return OI_CODEC_SBC_NOT_ENOUGH_HEADER_DATA;
|
|
}
|
|
|
|
#ifdef SBC_ENHANCED
|
|
if (context->limitFrameFormat && context->enhancedEnabled) {
|
|
/* If the context is restricted, only search for specified SYNCWORD */
|
|
search1 = search2;
|
|
} else if (context->enhancedEnabled == FALSE) {
|
|
/* If enhanced is not enabled, only search for classic SBC SYNCWORD*/
|
|
search2 = search1;
|
|
}
|
|
while (*frameBytes && (**frameData != search1) && (**frameData != search2)) {
|
|
(*frameBytes)--;
|
|
(*frameData)++;
|
|
}
|
|
if (*frameBytes) {
|
|
/* Syncword found, *frameData points to it, and *frameBytes correctly
|
|
* reflects the number of bytes available to read, including the
|
|
* syncword. */
|
|
context->common.frameInfo.enhanced =
|
|
(**frameData == OI_SBC_ENHANCED_SYNCWORD);
|
|
return OI_OK;
|
|
} else {
|
|
/* No syncword was found anywhere in the provided input data.
|
|
* *frameData points past the end of the original input, and
|
|
* *frameBytes is 0. */
|
|
return OI_CODEC_SBC_NO_SYNCWORD;
|
|
}
|
|
#else // SBC_ENHANCED
|
|
while (*frameBytes && (**frameData != OI_SBC_SYNCWORD)) {
|
|
(*frameBytes)--;
|
|
(*frameData)++;
|
|
}
|
|
if (*frameBytes) {
|
|
/* Syncword found, *frameData points to it, and *frameBytes correctly
|
|
* reflects the number of bytes available to read, including the
|
|
* syncword. */
|
|
context->common.frameInfo.enhanced = FALSE;
|
|
return OI_OK;
|
|
} else {
|
|
/* No syncword was found anywhere in the provided input data.
|
|
* *frameData points past the end of the original input, and
|
|
* *frameBytes is 0. */
|
|
return OI_CODEC_SBC_NO_SYNCWORD;
|
|
}
|
|
#endif // SBC_ENHANCED
|
|
}
|
|
|
|
static OI_STATUS DecodeBody(OI_CODEC_SBC_DECODER_CONTEXT* context,
|
|
const OI_BYTE* bodyData, int16_t* pcmData,
|
|
uint32_t* pcmBytes, OI_BOOL allowPartial) {
|
|
OI_BITSTREAM bs;
|
|
OI_UINT frameSamples = context->common.frameInfo.nrof_blocks *
|
|
context->common.frameInfo.nrof_subbands;
|
|
OI_UINT decode_block_count;
|
|
|
|
/*
|
|
* Based on the header data, make sure that there is enough room to write the
|
|
* output samples.
|
|
*/
|
|
if (*pcmBytes <
|
|
(sizeof(int16_t) * frameSamples * context->common.pcmStride) &&
|
|
!allowPartial) {
|
|
/* If we're not allowing partial decodes, we need room for the entire
|
|
* codec frame */
|
|
TRACE(("-OI_CODEC_SBC_Decode: OI_CODEC_SBC_NOT_ENOUGH_AUDIO_DATA"));
|
|
return OI_CODEC_SBC_NOT_ENOUGH_AUDIO_DATA;
|
|
} else if (*pcmBytes < sizeof(int16_t) *
|
|
context->common.frameInfo.nrof_subbands *
|
|
context->common.pcmStride) {
|
|
/* Even if we're allowing partials, we can still only decode on a frame
|
|
* boundary */
|
|
return OI_CODEC_SBC_NOT_ENOUGH_AUDIO_DATA;
|
|
}
|
|
|
|
if (context->bufferedBlocks == 0) {
|
|
TRACE(("Reading scalefactors"));
|
|
OI_SBC_ReadScalefactors(&context->common, bodyData, &bs);
|
|
|
|
TRACE(("Computing bit allocation"));
|
|
OI_SBC_ComputeBitAllocation(&context->common);
|
|
|
|
TRACE(("Reading samples"));
|
|
if (context->common.frameInfo.mode == SBC_JOINT_STEREO) {
|
|
OI_SBC_ReadSamplesJoint(context, &bs);
|
|
} else {
|
|
OI_SBC_ReadSamples(context, &bs);
|
|
}
|
|
|
|
context->bufferedBlocks = context->common.frameInfo.nrof_blocks;
|
|
}
|
|
|
|
if (allowPartial) {
|
|
decode_block_count = *pcmBytes / sizeof(int16_t) /
|
|
context->common.pcmStride /
|
|
context->common.frameInfo.nrof_subbands;
|
|
|
|
if (decode_block_count > context->bufferedBlocks) {
|
|
decode_block_count = context->bufferedBlocks;
|
|
}
|
|
|
|
} else {
|
|
decode_block_count = context->common.frameInfo.nrof_blocks;
|
|
}
|
|
|
|
TRACE(("Synthesizing frame"));
|
|
{
|
|
OI_UINT start_block =
|
|
context->common.frameInfo.nrof_blocks - context->bufferedBlocks;
|
|
OI_SBC_SynthFrame(context, pcmData, start_block, decode_block_count);
|
|
}
|
|
|
|
OI_ASSERT(context->bufferedBlocks >= decode_block_count);
|
|
context->bufferedBlocks -= decode_block_count;
|
|
|
|
frameSamples = decode_block_count * context->common.frameInfo.nrof_subbands;
|
|
|
|
/*
|
|
* When decoding mono into a stride-2 array, copy pcm data to second channel
|
|
*/
|
|
if (context->common.frameInfo.nrof_channels == 1 &&
|
|
context->common.pcmStride == 2) {
|
|
OI_UINT i;
|
|
for (i = 0; i < frameSamples; ++i) {
|
|
pcmData[2 * i + 1] = pcmData[2 * i];
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Return number of pcm bytes generated by the decode operation.
|
|
*/
|
|
*pcmBytes = frameSamples * sizeof(int16_t) * context->common.pcmStride;
|
|
if (context->bufferedBlocks > 0) {
|
|
return OI_CODEC_SBC_PARTIAL_DECODE;
|
|
} else {
|
|
return OI_OK;
|
|
}
|
|
}
|
|
|
|
PRIVATE OI_STATUS internal_DecodeRaw(OI_CODEC_SBC_DECODER_CONTEXT* context,
|
|
uint8_t bitpool, const OI_BYTE** frameData,
|
|
uint32_t* frameBytes, int16_t* pcmData,
|
|
uint32_t* pcmBytes) {
|
|
OI_STATUS status;
|
|
OI_UINT bodyLen;
|
|
|
|
TRACE(("+OI_CODEC_SBC_DecodeRaw"));
|
|
|
|
if (context->bufferedBlocks == 0) {
|
|
/*
|
|
* The bitallocator needs to know the bitpool value.
|
|
*/
|
|
context->common.frameInfo.bitpool = bitpool;
|
|
/*
|
|
* Compute the frame length and check we have enough frame data to proceed
|
|
*/
|
|
bodyLen = OI_CODEC_SBC_CalculateFramelen(&context->common.frameInfo) -
|
|
SBC_HEADER_LEN;
|
|
if (*frameBytes < bodyLen) {
|
|
TRACE(("-OI_CODEC_SBC_Decode: OI_CODEC_SBC_NOT_ENOUGH_BODY_DATA"));
|
|
return OI_CODEC_SBC_NOT_ENOUGH_BODY_DATA;
|
|
}
|
|
} else {
|
|
bodyLen = 0;
|
|
}
|
|
/*
|
|
* Decode the SBC data. Pass TRUE to DecodeBody to allow partial decoding of
|
|
* tones.
|
|
*/
|
|
status = DecodeBody(context, *frameData, pcmData, pcmBytes, TRUE);
|
|
if (OI_SUCCESS(status) || status == OI_CODEC_SBC_PARTIAL_DECODE) {
|
|
*frameData += bodyLen;
|
|
*frameBytes -= bodyLen;
|
|
}
|
|
TRACE(("-OI_CODEC_SBC_DecodeRaw: %d", status));
|
|
return status;
|
|
}
|
|
|
|
OI_STATUS OI_CODEC_SBC_DecoderReset(OI_CODEC_SBC_DECODER_CONTEXT* context,
|
|
uint32_t* decoderData,
|
|
uint32_t decoderDataBytes,
|
|
uint8_t maxChannels, uint8_t pcmStride,
|
|
OI_BOOL enhanced) {
|
|
return internal_DecoderReset(context, decoderData, decoderDataBytes,
|
|
maxChannels, pcmStride, enhanced);
|
|
}
|
|
|
|
OI_STATUS OI_CODEC_SBC_DecodeFrame(OI_CODEC_SBC_DECODER_CONTEXT* context,
|
|
const OI_BYTE** frameData,
|
|
uint32_t* frameBytes, int16_t* pcmData,
|
|
uint32_t* pcmBytes) {
|
|
OI_STATUS status;
|
|
OI_UINT framelen;
|
|
uint8_t crc;
|
|
|
|
TRACE(("+OI_CODEC_SBC_DecodeFrame"));
|
|
|
|
TRACE(("Finding syncword"));
|
|
status = FindSyncword(context, frameData, frameBytes);
|
|
if (!OI_SUCCESS(status)) {
|
|
return status;
|
|
}
|
|
|
|
/* Make sure enough data remains to read the header. */
|
|
if (*frameBytes < SBC_HEADER_LEN) {
|
|
TRACE(("-OI_CODEC_SBC_DecodeFrame: OI_CODEC_SBC_NOT_ENOUGH_HEADER_DATA"));
|
|
return OI_CODEC_SBC_NOT_ENOUGH_HEADER_DATA;
|
|
}
|
|
|
|
TRACE(("Reading Header"));
|
|
OI_SBC_ReadHeader(&context->common, *frameData);
|
|
|
|
/*
|
|
* Some implementations load the decoder into RAM and use overlays for 4 vs 8
|
|
* subbands. We need
|
|
* to ensure that the SBC parameters for this frame are compatible with the
|
|
* restrictions imposed
|
|
* by the loaded overlays.
|
|
*/
|
|
if (context->limitFrameFormat &&
|
|
(context->common.frameInfo.subbands != context->restrictSubbands)) {
|
|
ERROR(("SBC parameters incompatible with loaded overlay"));
|
|
return OI_STATUS_INVALID_PARAMETERS;
|
|
}
|
|
|
|
if (context->common.frameInfo.nrof_channels > context->common.maxChannels) {
|
|
ERROR(
|
|
("SBC parameters incompatible with number of channels specified during "
|
|
"reset"));
|
|
return OI_STATUS_INVALID_PARAMETERS;
|
|
}
|
|
|
|
if (context->common.pcmStride < 1 || context->common.pcmStride > 2) {
|
|
ERROR(("PCM stride not set correctly during reset"));
|
|
return OI_STATUS_INVALID_PARAMETERS;
|
|
}
|
|
|
|
/*
|
|
* At this point a header has been read. However, it's possible that we found
|
|
* a false syncword,
|
|
* so the header data might be invalid. Make sure we have enough bytes to read
|
|
* in the
|
|
* CRC-protected header, but don't require we have the whole frame. That way,
|
|
* if it turns out
|
|
* that we're acting on bogus header data, we don't stall the decoding process
|
|
* by waiting for
|
|
* data that we don't actually need.
|
|
*/
|
|
framelen = OI_CODEC_SBC_CalculateFramelen(&context->common.frameInfo);
|
|
if (*frameBytes < framelen) {
|
|
TRACE(("-OI_CODEC_SBC_DecodeFrame: OI_CODEC_SBC_NOT_ENOUGH_BODY_DATA"));
|
|
return OI_CODEC_SBC_NOT_ENOUGH_BODY_DATA;
|
|
}
|
|
|
|
TRACE(("Calculating checksum"));
|
|
|
|
crc = OI_SBC_CalculateChecksum(&context->common.frameInfo, *frameData);
|
|
if (crc != context->common.frameInfo.crc) {
|
|
TRACE(("CRC Mismatch: calc=%02x read=%02x\n", crc,
|
|
context->common.frameInfo.crc));
|
|
TRACE(("-OI_CODEC_SBC_DecodeFrame: OI_CODEC_SBC_CHECKSUM_MISMATCH"));
|
|
return OI_CODEC_SBC_CHECKSUM_MISMATCH;
|
|
}
|
|
|
|
/*
|
|
* Make sure the bitpool values are sane.
|
|
*/
|
|
if ((context->common.frameInfo.bitpool < SBC_MIN_BITPOOL) &&
|
|
!context->common.frameInfo.enhanced) {
|
|
ERROR(("Bitpool too small: %d (must be >= 2)",
|
|
context->common.frameInfo.bitpool));
|
|
return OI_STATUS_INVALID_PARAMETERS;
|
|
}
|
|
if (context->common.frameInfo.bitpool >
|
|
OI_SBC_MaxBitpool(&context->common.frameInfo)) {
|
|
ERROR(("Bitpool too large: %d (must be <= %ld)",
|
|
context->common.frameInfo.bitpool,
|
|
OI_SBC_MaxBitpool(&context->common.frameInfo)));
|
|
return OI_STATUS_INVALID_PARAMETERS;
|
|
}
|
|
|
|
/*
|
|
* Now decode the SBC data. Partial decode is not yet implemented for an SBC
|
|
* stream, so pass FALSE to decode body to have it enforce the old rule that
|
|
* you have to decode a whole packet at a time.
|
|
*/
|
|
status = DecodeBody(context, *frameData + SBC_HEADER_LEN, pcmData, pcmBytes,
|
|
FALSE);
|
|
if (OI_SUCCESS(status)) {
|
|
*frameData += framelen;
|
|
*frameBytes -= framelen;
|
|
}
|
|
TRACE(("-OI_CODEC_SBC_DecodeFrame: %d", status));
|
|
|
|
return status;
|
|
}
|
|
|
|
OI_STATUS OI_CODEC_SBC_SkipFrame(OI_CODEC_SBC_DECODER_CONTEXT* context,
|
|
const OI_BYTE** frameData,
|
|
uint32_t* frameBytes) {
|
|
OI_STATUS status;
|
|
OI_UINT framelen;
|
|
OI_UINT headerlen;
|
|
uint8_t crc;
|
|
|
|
status = FindSyncword(context, frameData, frameBytes);
|
|
if (!OI_SUCCESS(status)) {
|
|
return status;
|
|
}
|
|
if (*frameBytes < SBC_HEADER_LEN) {
|
|
return OI_CODEC_SBC_NOT_ENOUGH_HEADER_DATA;
|
|
}
|
|
OI_SBC_ReadHeader(&context->common, *frameData);
|
|
framelen =
|
|
OI_SBC_CalculateFrameAndHeaderlen(&context->common.frameInfo, &headerlen);
|
|
if (*frameBytes < headerlen) {
|
|
return OI_CODEC_SBC_NOT_ENOUGH_HEADER_DATA;
|
|
}
|
|
crc = OI_SBC_CalculateChecksum(&context->common.frameInfo, *frameData);
|
|
if (crc != context->common.frameInfo.crc) {
|
|
return OI_CODEC_SBC_CHECKSUM_MISMATCH;
|
|
}
|
|
if (*frameBytes < framelen) {
|
|
return OI_CODEC_SBC_NOT_ENOUGH_BODY_DATA;
|
|
}
|
|
context->bufferedBlocks = 0;
|
|
*frameData += framelen;
|
|
*frameBytes -= framelen;
|
|
return OI_OK;
|
|
}
|
|
|
|
uint8_t OI_CODEC_SBC_FrameCount(OI_BYTE* frameData, uint32_t frameBytes) {
|
|
uint8_t mode;
|
|
uint8_t blocks;
|
|
uint8_t subbands;
|
|
uint8_t frameCount = 0;
|
|
OI_UINT frameLen;
|
|
|
|
while (frameBytes) {
|
|
while (frameBytes && ((frameData[0] & 0xFE) != 0x9C)) {
|
|
frameData++;
|
|
frameBytes--;
|
|
}
|
|
|
|
if (frameBytes < SBC_HEADER_LEN) {
|
|
return frameCount;
|
|
}
|
|
|
|
/* Extract and translate required fields from Header */
|
|
subbands = mode = blocks = frameData[1];
|
|
;
|
|
mode = (mode & (BIT3 | BIT2)) >> 2;
|
|
blocks = block_values[(blocks & (BIT5 | BIT4)) >> 4];
|
|
subbands = band_values[(subbands & BIT0)];
|
|
|
|
/* Inline logic to avoid corrupting context */
|
|
frameLen = blocks * frameData[2];
|
|
switch (mode) {
|
|
case SBC_JOINT_STEREO:
|
|
frameLen += subbands + (8 * subbands);
|
|
break;
|
|
|
|
case SBC_DUAL_CHANNEL:
|
|
frameLen *= 2;
|
|
__fallthrough;
|
|
|
|
default:
|
|
if (mode == SBC_MONO) {
|
|
frameLen += 4 * subbands;
|
|
} else {
|
|
frameLen += 8 * subbands;
|
|
}
|
|
}
|
|
|
|
frameCount++;
|
|
frameLen = SBC_HEADER_LEN + (frameLen + 7) / 8;
|
|
if (frameBytes > frameLen) {
|
|
frameBytes -= frameLen;
|
|
frameData += frameLen;
|
|
} else {
|
|
frameBytes = 0;
|
|
}
|
|
}
|
|
return frameCount;
|
|
}
|
|
|
|
/** Read quantized subband samples from the input bitstream and expand them. */
|
|
|
|
#ifdef SPECIALIZE_READ_SAMPLES_JOINT
|
|
|
|
PRIVATE void OI_SBC_ReadSamplesJoint4(OI_CODEC_SBC_DECODER_CONTEXT* context,
|
|
OI_BITSTREAM* global_bs) {
|
|
#define NROF_SUBBANDS 4
|
|
#include "readsamplesjoint.inc"
|
|
#undef NROF_SUBBANDS
|
|
}
|
|
|
|
PRIVATE void OI_SBC_ReadSamplesJoint8(OI_CODEC_SBC_DECODER_CONTEXT* context,
|
|
OI_BITSTREAM* global_bs) {
|
|
#define NROF_SUBBANDS 8
|
|
#include "readsamplesjoint.inc"
|
|
#undef NROF_SUBBANDS
|
|
}
|
|
|
|
typedef void (*READ_SAMPLES)(OI_CODEC_SBC_DECODER_CONTEXT* context,
|
|
OI_BITSTREAM* global_bs);
|
|
|
|
static const READ_SAMPLES SpecializedReadSamples[] = {OI_SBC_ReadSamplesJoint4,
|
|
OI_SBC_ReadSamplesJoint8};
|
|
|
|
#endif /* SPECIALIZE_READ_SAMPLES_JOINT */
|
|
|
|
PRIVATE void OI_SBC_ReadSamplesJoint(OI_CODEC_SBC_DECODER_CONTEXT* context,
|
|
OI_BITSTREAM* global_bs) {
|
|
OI_CODEC_SBC_COMMON_CONTEXT* common = &context->common;
|
|
OI_UINT nrof_subbands = common->frameInfo.nrof_subbands;
|
|
#ifdef SPECIALIZE_READ_SAMPLES_JOINT
|
|
OI_ASSERT((nrof_subbands >> 3u) <= 1u);
|
|
SpecializedReadSamples[nrof_subbands >> 3](context, global_bs);
|
|
#else
|
|
|
|
#define NROF_SUBBANDS nrof_subbands
|
|
#include "readsamplesjoint.inc"
|
|
#undef NROF_SUBBANDS
|
|
#endif /* SPECIALIZE_READ_SAMPLES_JOINT */
|
|
}
|
|
|
|
/**@}*/
|