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Diffstat (limited to 'fdk-aac/libMpegTPEnc/src/tpenc_latm.cpp')
| -rw-r--r-- | fdk-aac/libMpegTPEnc/src/tpenc_latm.cpp | 850 |
1 files changed, 850 insertions, 0 deletions
diff --git a/fdk-aac/libMpegTPEnc/src/tpenc_latm.cpp b/fdk-aac/libMpegTPEnc/src/tpenc_latm.cpp new file mode 100644 index 0000000..2d35d48 --- /dev/null +++ b/fdk-aac/libMpegTPEnc/src/tpenc_latm.cpp @@ -0,0 +1,850 @@ +/* ----------------------------------------------------------------------------- +Software License for The Fraunhofer FDK AAC Codec Library for Android + +© Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten +Forschung e.V. All rights reserved. + + 1. INTRODUCTION +The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software +that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding +scheme for digital audio. This FDK AAC Codec software is intended to be used on +a wide variety of Android devices. + +AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient +general perceptual audio codecs. AAC-ELD is considered the best-performing +full-bandwidth communications codec by independent studies and is widely +deployed. AAC has been standardized by ISO and IEC as part of the MPEG +specifications. + +Patent licenses for necessary patent claims for the FDK AAC Codec (including +those of Fraunhofer) may be obtained through Via Licensing +(www.vialicensing.com) or through the respective patent owners individually for +the purpose of encoding or decoding bit streams in products that are compliant +with the ISO/IEC MPEG audio standards. Please note that most manufacturers of +Android devices already license these patent claims through Via Licensing or +directly from the patent owners, and therefore FDK AAC Codec software may +already be covered under those patent licenses when it is used for those +licensed purposes only. + +Commercially-licensed AAC software libraries, including floating-point versions +with enhanced sound quality, are also available from Fraunhofer. Users are +encouraged to check the Fraunhofer website for additional applications +information and documentation. + +2. COPYRIGHT LICENSE + +Redistribution and use in source and binary forms, with or without modification, +are permitted without payment of copyright license fees provided that you +satisfy the following conditions: + +You must retain the complete text of this software license in redistributions of +the FDK AAC Codec or your modifications thereto in source code form. + +You must retain the complete text of this software license in the documentation +and/or other materials provided with redistributions of the FDK AAC Codec or +your modifications thereto in binary form. You must make available free of +charge copies of the complete source code of the FDK AAC Codec and your +modifications thereto to recipients of copies in binary form. + +The name of Fraunhofer may not be used to endorse or promote products derived +from this library without prior written permission. + +You may not charge copyright license fees for anyone to use, copy or distribute +the FDK AAC Codec software or your modifications thereto. + +Your modified versions of the FDK AAC Codec must carry prominent notices stating +that you changed the software and the date of any change. For modified versions +of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android" +must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK +AAC Codec Library for Android." + +3. NO PATENT LICENSE + +NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without +limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE. +Fraunhofer provides no warranty of patent non-infringement with respect to this +software. + +You may use this FDK AAC Codec software or modifications thereto only for +purposes that are authorized by appropriate patent licenses. + +4. DISCLAIMER + +This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright +holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, +including but not limited to the implied warranties of merchantability and +fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR +CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, +or consequential damages, including but not limited to procurement of substitute +goods or services; loss of use, data, or profits, or business interruption, +however caused and on any theory of liability, whether in contract, strict +liability, or tort (including negligence), arising in any way out of the use of +this software, even if advised of the possibility of such damage. + +5. CONTACT INFORMATION + +Fraunhofer Institute for Integrated Circuits IIS +Attention: Audio and Multimedia Departments - FDK AAC LL +Am Wolfsmantel 33 +91058 Erlangen, Germany + +www.iis.fraunhofer.de/amm +amm-info@iis.fraunhofer.de +----------------------------------------------------------------------------- */ + +/******************* MPEG transport format encoder library ********************* + + Author(s): + + Description: + +*******************************************************************************/ + +#include "tpenc_latm.h" + +#include "genericStds.h" + +static const short celpFrameLengthTable[64] = { + 154, 170, 186, 147, 156, 165, 114, 120, 186, 126, 132, 138, 142, + 146, 154, 166, 174, 182, 190, 198, 206, 210, 214, 110, 114, 118, + 120, 122, 218, 230, 242, 254, 266, 278, 286, 294, 318, 342, 358, + 374, 390, 406, 422, 136, 142, 148, 154, 160, 166, 170, 174, 186, + 198, 206, 214, 222, 230, 238, 216, 160, 280, 338, 0, 0}; + +/******* + write value to transport stream + first two bits define the size of the value itself + then the value itself, with a size of 0-3 bytes +*******/ +static UINT transportEnc_LatmWriteValue(HANDLE_FDK_BITSTREAM hBs, int value) { + UCHAR valueBytes = 4; + unsigned int bitsWritten = 0; + int i; + + if (value < (1 << 8)) { + valueBytes = 1; + } else if (value < (1 << 16)) { + valueBytes = 2; + } else if (value < (1 << 24)) { + valueBytes = 3; + } else { + valueBytes = 4; + } + + FDKwriteBits(hBs, valueBytes - 1, 2); /* size of value in Bytes */ + for (i = 0; i < valueBytes; i++) { + /* write most significant Byte first */ + FDKwriteBits(hBs, (UCHAR)(value >> ((valueBytes - 1 - i) << 3)), 8); + } + + bitsWritten = (valueBytes << 3) + 2; + + return bitsWritten; +} + +static UINT transportEnc_LatmCountFixBitDemandHeader(HANDLE_LATM_STREAM hAss) { + int bitDemand = 0; + int insertSetupData = 0; + + /* only if start of new latm frame */ + if (hAss->subFrameCnt == 0) { + /* AudioSyncStream */ + + if (hAss->tt == TT_MP4_LOAS) { + bitDemand += 11; /* syncword */ + bitDemand += 13; /* audioMuxLengthBytes */ + } + + /* AudioMuxElement*/ + + /* AudioMuxElement::Stream Mux Config */ + if (hAss->muxConfigPeriod > 0) { + insertSetupData = (hAss->latmFrameCounter == 0); + } else { + insertSetupData = 0; + } + + if (hAss->tt != TT_MP4_LATM_MCP0) { + /* AudioMuxElement::useSameStreamMux Flag */ + bitDemand += 1; + + if (insertSetupData) { + bitDemand += hAss->streamMuxConfigBits; + } + } + + /* AudioMuxElement::otherDataBits */ + bitDemand += hAss->otherDataLenBits; + + /* AudioMuxElement::ByteAlign */ + if (bitDemand % 8) { + hAss->fillBits = 8 - (bitDemand % 8); + bitDemand += hAss->fillBits; + } else { + hAss->fillBits = 0; + } + } + + return bitDemand; +} + +static UINT transportEnc_LatmCountVarBitDemandHeader( + HANDLE_LATM_STREAM hAss, unsigned int streamDataLength) { + int bitDemand = 0; + int prog, layer; + + /* Payload Length Info*/ + if (hAss->allStreamsSameTimeFraming) { + for (prog = 0; prog < hAss->noProgram; prog++) { + for (layer = 0; layer < LATM_MAX_LAYERS; layer++) { + LATM_LAYER_INFO *p_linfo = &(hAss->m_linfo[prog][layer]); + + if (p_linfo->streamID >= 0) { + switch (p_linfo->frameLengthType) { + case 0: + if (streamDataLength > 0) { + streamDataLength -= bitDemand; + while (streamDataLength >= (255 << 3)) { + bitDemand += 8; + streamDataLength -= (255 << 3); + } + bitDemand += 8; + } + break; + + case 1: + case 4: + case 6: + bitDemand += 2; + break; + + default: + return 0; + } + } + } + } + } else { + /* there are many possibilities to use this mechanism. */ + switch (hAss->varMode) { + case LATMVAR_SIMPLE_SEQUENCE: { + /* Use the sequence generated by the encoder */ + // int streamCntPosition = transportEnc_SetWritePointer( + // hAss->hAssemble, 0 ); int streamCntPosition = FDKgetValidBits( + // hAss->hAssemble ); + bitDemand += 4; + + hAss->varStreamCnt = 0; + for (prog = 0; prog < hAss->noProgram; prog++) { + for (layer = 0; layer < LATM_MAX_LAYERS; layer++) { + LATM_LAYER_INFO *p_linfo = &(hAss->m_linfo[prog][layer]); + + if (p_linfo->streamID >= 0) { + bitDemand += 4; /* streamID */ + switch (p_linfo->frameLengthType) { + case 0: + streamDataLength -= bitDemand; + while (streamDataLength >= (255 << 3)) { + bitDemand += 8; + streamDataLength -= (255 << 3); + } + + bitDemand += 8; + break; + /*bitDemand += 1; endFlag + break;*/ + + case 1: + case 4: + case 6: + + break; + + default: + return 0; + } + hAss->varStreamCnt++; + } + } + } + bitDemand += 4; + // transportEnc_UpdateBitstreamField( hAss->hAssemble, + // streamCntPosition, hAss->varStreamCnt-1, 4 ); UINT pos = + // streamCntPosition-FDKgetValidBits(hAss->hAssemble); FDKpushBack( + // hAss->hAssemble, pos); FDKwriteBits( hAss->hAssemble, + // hAss->varStreamCnt-1, 4); FDKpushFor( hAss->hAssemble, pos-4); + } break; + + default: + return 0; + } + } + + return bitDemand; +} + +TRANSPORTENC_ERROR +CreateStreamMuxConfig(HANDLE_LATM_STREAM hAss, HANDLE_FDK_BITSTREAM hBs, + int bufferFullness, CSTpCallBacks *cb) { + INT streamIDcnt, tmp; + int layer, prog; + + USHORT coreFrameOffset = 0; + + hAss->taraBufferFullness = 0xFF; + hAss->audioMuxVersionA = 0; /* for future extensions */ + hAss->streamMuxConfigBits = 0; + + FDKwriteBits(hBs, hAss->audioMuxVersion, 1); /* audioMuxVersion */ + hAss->streamMuxConfigBits += 1; + + if (hAss->audioMuxVersion == 1) { + FDKwriteBits(hBs, hAss->audioMuxVersionA, 1); /* audioMuxVersionA */ + hAss->streamMuxConfigBits += 1; + } + + if (hAss->audioMuxVersionA == 0) { + if (hAss->audioMuxVersion == 1) { + hAss->streamMuxConfigBits += transportEnc_LatmWriteValue( + hBs, hAss->taraBufferFullness); /* taraBufferFullness */ + } + FDKwriteBits(hBs, hAss->allStreamsSameTimeFraming ? 1 : 0, + 1); /* allStreamsSameTimeFraming */ + FDKwriteBits(hBs, hAss->noSubframes - 1, 6); /* Number of Subframes */ + FDKwriteBits(hBs, hAss->noProgram - 1, 4); /* Number of Programs */ + + hAss->streamMuxConfigBits += 11; + + streamIDcnt = 0; + for (prog = 0; prog < hAss->noProgram; prog++) { + int transLayer = 0; + + FDKwriteBits(hBs, hAss->noLayer[prog] - 1, 3); + hAss->streamMuxConfigBits += 3; + + for (layer = 0; layer < LATM_MAX_LAYERS; layer++) { + LATM_LAYER_INFO *p_linfo = &(hAss->m_linfo[prog][layer]); + CODER_CONFIG *p_lci = hAss->config[prog][layer]; + + p_linfo->streamID = -1; + + if (hAss->config[prog][layer] != NULL) { + int useSameConfig = 0; + + if (transLayer > 0) { + FDKwriteBits(hBs, useSameConfig ? 1 : 0, 1); + hAss->streamMuxConfigBits += 1; + } + if ((useSameConfig == 0) || (transLayer == 0)) { + const UINT alignAnchor = FDKgetValidBits(hBs); + + if (0 != + (transportEnc_writeASC(hBs, hAss->config[prog][layer], cb))) { + return TRANSPORTENC_UNKOWN_ERROR; + } + + if (hAss->audioMuxVersion == 1) { + UINT ascLen = transportEnc_LatmWriteValue(hBs, 0); + FDKbyteAlign(hBs, alignAnchor); + ascLen = FDKgetValidBits(hBs) - alignAnchor - ascLen; + FDKpushBack(hBs, FDKgetValidBits(hBs) - alignAnchor); + + transportEnc_LatmWriteValue(hBs, ascLen); + + if (0 != + (transportEnc_writeASC(hBs, hAss->config[prog][layer], cb))) { + return TRANSPORTENC_UNKOWN_ERROR; + } + + FDKbyteAlign(hBs, alignAnchor); /* asc length fillbits */ + } + + hAss->streamMuxConfigBits += + FDKgetValidBits(hBs) - + alignAnchor; /* add asc length to smc summary */ + } + transLayer++; + + if (!hAss->allStreamsSameTimeFraming) { + if (streamIDcnt >= LATM_MAX_STREAM_ID) + return TRANSPORTENC_INVALID_CONFIG; + } + p_linfo->streamID = streamIDcnt++; + + switch (p_lci->aot) { + case AOT_AAC_MAIN: + case AOT_AAC_LC: + case AOT_AAC_SSR: + case AOT_AAC_LTP: + case AOT_AAC_SCAL: + case AOT_ER_AAC_LD: + case AOT_ER_AAC_ELD: + case AOT_USAC: + p_linfo->frameLengthType = 0; + + FDKwriteBits(hBs, p_linfo->frameLengthType, + 3); /* frameLengthType */ + FDKwriteBits(hBs, bufferFullness, 8); /* bufferFullness */ + hAss->streamMuxConfigBits += 11; + + if (!hAss->allStreamsSameTimeFraming) { + CODER_CONFIG *p_lci_prev = hAss->config[prog][layer - 1]; + if (((p_lci->aot == AOT_AAC_SCAL) || + (p_lci->aot == AOT_ER_AAC_SCAL)) && + ((p_lci_prev->aot == AOT_CELP) || + (p_lci_prev->aot == AOT_ER_CELP))) { + FDKwriteBits(hBs, coreFrameOffset, 6); /* coreFrameOffset */ + hAss->streamMuxConfigBits += 6; + } + } + break; + + case AOT_TWIN_VQ: + p_linfo->frameLengthType = 1; + tmp = ((p_lci->bitsFrame + 7) >> 3) - + 20; /* transmission frame length in bytes */ + if ((tmp < 0)) { + return TRANSPORTENC_INVALID_TRANSMISSION_FRAME_LENGTH; + } + FDKwriteBits(hBs, p_linfo->frameLengthType, + 3); /* frameLengthType */ + FDKwriteBits(hBs, tmp, 9); + hAss->streamMuxConfigBits += 12; + + p_linfo->frameLengthBits = (tmp + 20) << 3; + break; + + case AOT_CELP: + p_linfo->frameLengthType = 4; + FDKwriteBits(hBs, p_linfo->frameLengthType, + 3); /* frameLengthType */ + hAss->streamMuxConfigBits += 3; + { + int i; + for (i = 0; i < 62; i++) { + if (celpFrameLengthTable[i] == p_lci->bitsFrame) break; + } + if (i >= 62) { + return TRANSPORTENC_INVALID_CELP_FRAME_LENGTH; + } + + FDKwriteBits(hBs, i, 6); /* CELPframeLengthTabelIndex */ + hAss->streamMuxConfigBits += 6; + } + p_linfo->frameLengthBits = p_lci->bitsFrame; + break; + + case AOT_HVXC: + p_linfo->frameLengthType = 6; + FDKwriteBits(hBs, p_linfo->frameLengthType, + 3); /* frameLengthType */ + hAss->streamMuxConfigBits += 3; + { + int i; + + if (p_lci->bitsFrame == 40) { + i = 0; + } else if (p_lci->bitsFrame == 80) { + i = 1; + } else { + return TRANSPORTENC_INVALID_FRAME_BITS; + } + FDKwriteBits(hBs, i, 1); /* HVXCframeLengthTableIndex */ + hAss->streamMuxConfigBits += 1; + } + p_linfo->frameLengthBits = p_lci->bitsFrame; + break; + + case AOT_NULL_OBJECT: + default: + return TRANSPORTENC_INVALID_AOT; + } + } + } + } + + FDKwriteBits(hBs, (hAss->otherDataLenBits > 0) ? 1 : 0, + 1); /* otherDataPresent */ + hAss->streamMuxConfigBits += 1; + + if (hAss->otherDataLenBits > 0) { + FDKwriteBits(hBs, 0, 1); + FDKwriteBits(hBs, hAss->otherDataLenBits, 8); + hAss->streamMuxConfigBits += 9; + } + + FDKwriteBits(hBs, 0, 1); /* crcCheckPresent=0 */ + hAss->streamMuxConfigBits += 1; + + } else { /* if ( audioMuxVersionA == 0 ) */ + + /* for future extensions */ + } + + return TRANSPORTENC_OK; +} + +static TRANSPORTENC_ERROR WriteAuPayloadLengthInfo( + HANDLE_FDK_BITSTREAM hBitStream, int AuLengthBits) { + int restBytes; + + if (AuLengthBits % 8) return TRANSPORTENC_INVALID_AU_LENGTH; + + while (AuLengthBits >= 255 * 8) { + FDKwriteBits(hBitStream, 255, 8); /* 255 shows incomplete AU */ + AuLengthBits -= (255 * 8); + } + + restBytes = (AuLengthBits) >> 3; + FDKwriteBits(hBitStream, restBytes, 8); + + return TRANSPORTENC_OK; +} + +static TRANSPORTENC_ERROR transportEnc_LatmSetNrOfSubframes( + HANDLE_LATM_STREAM hAss, INT noSubframes_next) /* nr of access units / + payloads within a latm + frame */ +{ + /* sanity chk */ + if (noSubframes_next < 1 || noSubframes_next > MAX_NR_OF_SUBFRAMES) { + return TRANSPORTENC_LATM_INVALID_NR_OF_SUBFRAMES; + } + + hAss->noSubframes_next = noSubframes_next; + + /* if at start then we can take over the value immediately, otherwise we have + * to wait for the next SMC */ + if ((hAss->subFrameCnt == 0) && (hAss->latmFrameCounter == 0)) { + hAss->noSubframes = noSubframes_next; + } + + return TRANSPORTENC_OK; +} + +static int allStreamsSameTimeFraming(HANDLE_LATM_STREAM hAss, UCHAR noProgram, + UCHAR noLayer[] /* return */) { + int prog, layer; + + signed int lastNoSamples = -1; + signed int minFrameSamples = FDK_INT_MAX; + signed int maxFrameSamples = 0; + + signed int highestSamplingRate = -1; + + for (prog = 0; prog < noProgram; prog++) { + noLayer[prog] = 0; + + for (layer = 0; layer < LATM_MAX_LAYERS; layer++) { + if (hAss->config[prog][layer] != NULL) { + INT hsfSamplesFrame; + + noLayer[prog]++; + + if (highestSamplingRate < 0) + highestSamplingRate = hAss->config[prog][layer]->samplingRate; + + hsfSamplesFrame = hAss->config[prog][layer]->samplesPerFrame * + highestSamplingRate / + hAss->config[prog][layer]->samplingRate; + + if (hsfSamplesFrame <= minFrameSamples) + minFrameSamples = hsfSamplesFrame; + if (hsfSamplesFrame >= maxFrameSamples) + maxFrameSamples = hsfSamplesFrame; + + if (lastNoSamples == -1) { + lastNoSamples = hsfSamplesFrame; + } else { + if (hsfSamplesFrame != lastNoSamples) { + return 0; + } + } + } + } + } + + return 1; +} + +/** + * Initialize LATM/LOAS Stream and add layer 0 at program 0. + */ +static TRANSPORTENC_ERROR transportEnc_InitLatmStream( + HANDLE_LATM_STREAM hAss, int fractDelayPresent, + signed int + muxConfigPeriod, /* insert setup data every muxConfigPeriod frames */ + UINT audioMuxVersion, TRANSPORT_TYPE tt) { + TRANSPORTENC_ERROR ErrorStatus = TRANSPORTENC_OK; + + if (hAss == NULL) return TRANSPORTENC_INVALID_PARAMETER; + + hAss->tt = tt; + + hAss->noProgram = 1; + + hAss->audioMuxVersion = audioMuxVersion; + + /* Fill noLayer array using hAss->config */ + hAss->allStreamsSameTimeFraming = + allStreamsSameTimeFraming(hAss, hAss->noProgram, hAss->noLayer); + /* Only allStreamsSameTimeFraming==1 is supported */ + FDK_ASSERT(hAss->allStreamsSameTimeFraming); + + hAss->fractDelayPresent = fractDelayPresent; + hAss->otherDataLenBits = 0; + + hAss->varMode = LATMVAR_SIMPLE_SEQUENCE; + + /* initialize counters */ + hAss->subFrameCnt = 0; + hAss->noSubframes = DEFAULT_LATM_NR_OF_SUBFRAMES; + hAss->noSubframes_next = DEFAULT_LATM_NR_OF_SUBFRAMES; + + /* sync layer related */ + hAss->audioMuxLengthBytes = 0; + + hAss->latmFrameCounter = 0; + hAss->muxConfigPeriod = muxConfigPeriod; + + return ErrorStatus; +} + +/** + * + */ +UINT transportEnc_LatmCountTotalBitDemandHeader(HANDLE_LATM_STREAM hAss, + unsigned int streamDataLength) { + UINT bitDemand = 0; + + switch (hAss->tt) { + case TT_MP4_LOAS: + case TT_MP4_LATM_MCP0: + case TT_MP4_LATM_MCP1: + if (hAss->subFrameCnt == 0) { + bitDemand = transportEnc_LatmCountFixBitDemandHeader(hAss); + } + bitDemand += transportEnc_LatmCountVarBitDemandHeader( + hAss, streamDataLength /*- bitDemand*/); + break; + default: + break; + } + + return bitDemand; +} + +static TRANSPORTENC_ERROR AdvanceAudioMuxElement(HANDLE_LATM_STREAM hAss, + HANDLE_FDK_BITSTREAM hBs, + int auBits, int bufferFullness, + CSTpCallBacks *cb) { + TRANSPORTENC_ERROR ErrorStatus = TRANSPORTENC_OK; + int insertMuxSetup; + + /* Insert setup data to assemble Buffer */ + if (hAss->subFrameCnt == 0) { + if (hAss->muxConfigPeriod > 0) { + insertMuxSetup = (hAss->latmFrameCounter == 0); + } else { + insertMuxSetup = 0; + } + + if (hAss->tt != TT_MP4_LATM_MCP0) { + if (insertMuxSetup) { + FDKwriteBits(hBs, 0, 1); /* useSameStreamMux useNewStreamMux */ + if (TRANSPORTENC_OK != (ErrorStatus = CreateStreamMuxConfig( + hAss, hBs, bufferFullness, cb))) { + return ErrorStatus; + } + } else { + FDKwriteBits(hBs, 1, 1); /* useSameStreamMux */ + } + } + } + + /* PayloadLengthInfo */ + { + int prog, layer; + + for (prog = 0; prog < hAss->noProgram; prog++) { + for (layer = 0; layer < hAss->noLayer[prog]; layer++) { + ErrorStatus = WriteAuPayloadLengthInfo(hBs, auBits); + if (ErrorStatus != TRANSPORTENC_OK) return ErrorStatus; + } + } + } + /* At this point comes the access unit. */ + + return TRANSPORTENC_OK; +} + +TRANSPORTENC_ERROR +transportEnc_LatmWrite(HANDLE_LATM_STREAM hAss, HANDLE_FDK_BITSTREAM hBs, + int auBits, int bufferFullness, CSTpCallBacks *cb) { + TRANSPORTENC_ERROR ErrorStatus; + + if (hAss->subFrameCnt == 0) { + /* Start new frame */ + FDKresetBitbuffer(hBs, BS_WRITER); + } + + hAss->latmSubframeStart = FDKgetValidBits(hBs); + + /* Insert syncword and syncword distance + - only if loas + - we must update the syncword distance (=audiomuxlengthbytes) later + */ + if (hAss->tt == TT_MP4_LOAS && hAss->subFrameCnt == 0) { + /* Start new LOAS frame */ + FDKwriteBits(hBs, 0x2B7, 11); + hAss->audioMuxLengthBytes = 0; + hAss->audioMuxLengthBytesPos = + FDKgetValidBits(hBs); /* store read pointer position */ + FDKwriteBits(hBs, hAss->audioMuxLengthBytes, 13); + } + + ErrorStatus = AdvanceAudioMuxElement(hAss, hBs, auBits, bufferFullness, cb); + + if (ErrorStatus != TRANSPORTENC_OK) return ErrorStatus; + + return ErrorStatus; +} + +void transportEnc_LatmAdjustSubframeBits(HANDLE_LATM_STREAM hAss, int *bits) { + /* Substract bits from possible previous subframe */ + *bits -= hAss->latmSubframeStart; + /* Add fill bits */ + if (hAss->subFrameCnt == 0) { + *bits += hAss->otherDataLenBits; + *bits += hAss->fillBits; + } +} + +TRANSPORTENC_ERROR transportEnc_LatmGetFrame(HANDLE_LATM_STREAM hAss, + HANDLE_FDK_BITSTREAM hBs, + int *pBytes) { + TRANSPORTENC_ERROR ErrorStatus = TRANSPORTENC_OK; + + hAss->subFrameCnt++; + if (hAss->subFrameCnt >= hAss->noSubframes) { + /* Add LOAS frame length if required. */ + if (hAss->tt == TT_MP4_LOAS) { + FDK_BITSTREAM tmpBuf; + + /* Determine frame length info */ + hAss->audioMuxLengthBytes = + ((FDKgetValidBits(hBs) + hAss->otherDataLenBits + 7) >> 3) - + 3; /* 3=Syncword + length */ + + /* Check frame length info */ + if (hAss->audioMuxLengthBytes >= (1 << 13)) { + ErrorStatus = TRANSPORTENC_INVALID_AU_LENGTH; + goto bail; + } + + /* Write length info into assembler buffer */ + FDKinitBitStream(&tmpBuf, hBs->hBitBuf.Buffer, hBs->hBitBuf.bufSize, 0, + BS_WRITER); + FDKpushFor(&tmpBuf, hAss->audioMuxLengthBytesPos); + FDKwriteBits(&tmpBuf, hAss->audioMuxLengthBytes, 13); + FDKsyncCache(&tmpBuf); + } + + /* Write AudioMuxElement other data bits */ + FDKwriteBits(hBs, 0, hAss->otherDataLenBits); + + /* Write AudioMuxElement byte alignment fill bits */ + FDKwriteBits(hBs, 0, hAss->fillBits); + + FDK_ASSERT((FDKgetValidBits(hBs) % 8) == 0); + + hAss->subFrameCnt = 0; + + FDKsyncCache(hBs); + *pBytes = (FDKgetValidBits(hBs) + 7) >> 3; + + if (hAss->muxConfigPeriod > 0) { + hAss->latmFrameCounter++; + + if (hAss->latmFrameCounter >= hAss->muxConfigPeriod) { + hAss->latmFrameCounter = 0; + hAss->noSubframes = hAss->noSubframes_next; + } + } + } else { + /* No data this time */ + *pBytes = 0; + } + +bail: + return ErrorStatus; +} + +/** + * Init LATM/LOAS + */ +TRANSPORTENC_ERROR transportEnc_Latm_Init(HANDLE_LATM_STREAM hAss, + HANDLE_FDK_BITSTREAM hBs, + CODER_CONFIG *layerConfig, + UINT audioMuxVersion, + TRANSPORT_TYPE tt, + CSTpCallBacks *cb) { + TRANSPORTENC_ERROR ErrorStatus; + int fractDelayPresent = 0; + int prog, layer; + + int setupDataDistanceFrames = layerConfig->headerPeriod; + + FDK_ASSERT(setupDataDistanceFrames >= 0); + + for (prog = 0; prog < LATM_MAX_PROGRAMS; prog++) { + for (layer = 0; layer < LATM_MAX_LAYERS; layer++) { + hAss->config[prog][layer] = NULL; + hAss->m_linfo[prog][layer].streamID = -1; + } + } + + hAss->config[0][0] = layerConfig; + hAss->m_linfo[0][0].streamID = 0; + + ErrorStatus = transportEnc_InitLatmStream(hAss, fractDelayPresent, + setupDataDistanceFrames, + (audioMuxVersion) ? 1 : 0, tt); + if (ErrorStatus != TRANSPORTENC_OK) goto bail; + + ErrorStatus = + transportEnc_LatmSetNrOfSubframes(hAss, layerConfig->nSubFrames); + if (ErrorStatus != TRANSPORTENC_OK) goto bail; + + /* Get the size of the StreamMuxConfig somehow */ + if (TRANSPORTENC_OK != + (ErrorStatus = AdvanceAudioMuxElement(hAss, hBs, 0, 0, cb))) { + goto bail; + } + + // CreateStreamMuxConfig(hAss, hBs, 0); + +bail: + return ErrorStatus; +} + +TRANSPORTENC_ERROR transportEnc_LatmAddOtherDataBits(HANDLE_LATM_STREAM hAss, + const int otherDataBits) { + TRANSPORTENC_ERROR ErrorStatus = TRANSPORTENC_OK; + + if ((hAss->otherDataLenBits != 0) || (otherDataBits % 8 != 0)) { + /* This implementation allows to add other data bits only once. + To keep existing alignment only whole bytes are allowed. */ + ErrorStatus = TRANSPORTENC_UNKOWN_ERROR; + } else { + /* Ensure correct addional bits in payload. */ + if (hAss->tt == TT_MP4_LATM_MCP0) { + hAss->otherDataLenBits = otherDataBits; + } else { + hAss->otherDataLenBits = otherDataBits - 9; + hAss->streamMuxConfigBits += 9; + } + } + + return ErrorStatus; +} |