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path: root/libMpegTPEnc/src/tpenc_asc.cpp
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+/***************************** MPEG-4 AAC Encoder **************************
+
+ (C) Copyright Fraunhofer IIS (2005)
+ All Rights Reserved
+
+ Please be advised that this software and/or program delivery is
+ Confidential Information of Fraunhofer and subject to and covered by the
+
+ Fraunhofer IIS Software Evaluation Agreement
+ between Google Inc. and Fraunhofer
+ effective and in full force since March 1, 2012.
+
+ You may use this software and/or program only under the terms and
+ conditions described in the above mentioned Fraunhofer IIS Software
+ Evaluation Agreement. Any other and/or further use requires a separate agreement.
+
+
+ $Id$
+ Author(s):
+ Description:
+
+ This software and/or program is protected by copyright law and international
+ treaties. Any reproduction or distribution of this software and/or program,
+ or any portion of it, may result in severe civil and criminal penalties, and
+ will be prosecuted to the maximum extent possible under law.
+
+******************************************************************************/
+
+#include "tp_data.h"
+
+#include "tpenc_lib.h"
+#include "tpenc_asc.h"
+#include "FDK_bitstream.h"
+#include "genericStds.h"
+
+#define ASC_FLAG_EXT 0x0001
+#define ASC_FLAG_SBR 0x0002
+#define ASC_FLAG_SBRCRC 0x0004
+#define ASC_FLAG_VCB11 0x0010
+#define ASC_FLAG_RVLC 0x0020
+#define ASC_FLAG_HCR 0x0040
+#define ASC_FLAG_HCR 0x0040
+
+
+#define PCE_MAX_ELEMENTS 8
+
+/**
+ * Describe a PCE based on placed channel elements and element type sequence.
+ */
+typedef struct {
+
+ UCHAR num_front_channel_elements; /*!< Number of front channel elements. */
+ UCHAR num_side_channel_elements; /*!< Number of side channel elements. */
+ UCHAR num_back_channel_elements; /*!< Number of back channel elements. */
+ UCHAR num_lfe_channel_elements; /*!< Number of lfe channel elements. */
+ MP4_ELEMENT_ID el_list[PCE_MAX_ELEMENTS];/*!< List contains sequence describing the elements
+ in present channel mode. (MPEG order) */
+} PCE_CONFIGURATION;
+
+
+/**
+ * Map an incoming channel mode to a existing PCE configuration entry.
+ */
+typedef struct {
+
+ CHANNEL_MODE channel_mode; /*!< Present channel mode. */
+ PCE_CONFIGURATION pce_configuration; /*!< Program config element description. */
+
+} CHANNEL_CONFIGURATION;
+
+
+/**
+ * \brief Table contains all supported channel modes and according PCE configuration description.
+ *
+ * The number of channel element parameter describes the kind of consecutively elements.
+ * E.g. MODE_1_2_2_2_1 means:
+ * - First 2 elements (SCE,CPE) are front channel elements.
+ * - Following element (CPE) is a side channel element.
+ * - Next element (CPE) is a back channel element.
+ * - Last element (LFE) is a lfe channel element.
+ */
+static const CHANNEL_CONFIGURATION pceConfigTab[] =
+{
+ { MODE_1, { 1, 0, 0, 0, { ID_SCE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE } } },
+ { MODE_2, { 1, 0, 0, 0, { ID_CPE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE } } },
+ { MODE_1_2, { 2, 0, 0, 0, { ID_SCE, ID_CPE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE } } },
+ { MODE_1_2_1, { 2, 0, 1, 0, { ID_SCE, ID_CPE, ID_SCE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE } } },
+ { MODE_1_2_2, { 2, 0, 1, 0, { ID_SCE, ID_CPE, ID_CPE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE } } },
+ { MODE_1_2_2_1, { 2, 0, 1, 1, { ID_SCE, ID_CPE, ID_CPE, ID_LFE, ID_NONE, ID_NONE, ID_NONE, ID_NONE } } },
+ { MODE_1_2_2_2_1, { 2, 1, 1, 1, { ID_SCE, ID_CPE, ID_CPE, ID_CPE, ID_LFE, ID_NONE, ID_NONE, ID_NONE } } },
+
+ { MODE_1_1, { 2, 0, 0, 0, { ID_SCE, ID_SCE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE } } },
+ { MODE_1_1_1_1, { 2, 2, 0, 0, { ID_SCE, ID_SCE, ID_SCE, ID_SCE, ID_NONE, ID_NONE, ID_NONE, ID_NONE } } },
+ { MODE_1_1_1_1_1_1, { 2, 2, 2, 0, { ID_SCE, ID_SCE, ID_SCE, ID_SCE, ID_SCE, ID_SCE, ID_NONE, ID_NONE } } },
+ { MODE_1_1_1_1_1_1_1_1, { 3, 2, 3, 0, { ID_SCE, ID_SCE, ID_SCE, ID_SCE, ID_SCE, ID_SCE, ID_SCE, ID_SCE } } },
+
+ { MODE_2_2, { 1, 0, 1, 0, { ID_CPE, ID_CPE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE } } },
+ { MODE_2_2_2, { 1, 1, 1, 0, { ID_CPE, ID_CPE, ID_CPE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE } } },
+ { MODE_2_2_2_2, { 4, 0, 0, 0, { ID_CPE, ID_CPE, ID_CPE, ID_CPE, ID_NONE, ID_NONE, ID_NONE, ID_NONE } } },
+
+ { MODE_2_1, { 1, 0, 1, 0, { ID_CPE, ID_SCE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE } } }
+};
+
+
+/**
+ * \brief Get program config element description for existing channel mode.
+ *
+ * \param channel_mode Current channel mode.
+ *
+ * \return
+ * - Pointer to PCE_CONFIGURATION entry, on success.
+ * - NULL, on failure.
+ */
+static const PCE_CONFIGURATION* getPceEntry(
+ const CHANNEL_MODE channel_mode
+ )
+{
+ UINT i;
+ const PCE_CONFIGURATION *pce_config = NULL;
+
+ for (i=0; i < (sizeof(pceConfigTab)/sizeof(CHANNEL_CONFIGURATION)); i++) {
+ if (pceConfigTab[i].channel_mode == channel_mode) {
+ pce_config = &pceConfigTab[i].pce_configuration;
+ }
+ }
+
+ return pce_config;
+}
+
+int getChannelConfig( CHANNEL_MODE channel_mode )
+{
+ INT chan_config = 0;
+
+ switch(channel_mode) {
+ case MODE_1: chan_config = 1; break;
+ case MODE_2: chan_config = 2; break;
+ case MODE_1_2: chan_config = 3; break;
+ case MODE_1_2_1: chan_config = 4; break;
+ case MODE_1_2_2: chan_config = 5; break;
+ case MODE_1_2_2_1: chan_config = 6; break;
+ case MODE_1_2_2_2_1: chan_config = 7; break;
+
+ default: chan_config = 0;
+ }
+
+ return chan_config;
+}
+
+CHANNEL_MODE transportEnc_GetChannelMode( int noChannels )
+{
+ CHANNEL_MODE chMode;
+
+ if (noChannels <= 8 && noChannels > 0)
+ chMode = (CHANNEL_MODE)((noChannels == 8) ? 7 : noChannels); /* see : iso/mpeg4 v1 audio subpart1*/
+ else
+ chMode = MODE_UNKNOWN;
+
+ return chMode;
+}
+
+#ifdef TP_PCE_ENABLE
+int transportEnc_writePCE(HANDLE_FDK_BITSTREAM hBs,
+ CHANNEL_MODE channelMode,
+ INT sampleRate,
+ int instanceTagPCE,
+ int profile,
+ int matrixMixdownA,
+ int pseudoSurroundEnable,
+ UINT alignAnchor)
+{
+ int sampleRateIndex, i;
+ const PCE_CONFIGURATION* config = NULL;
+ const MP4_ELEMENT_ID* pEl_list = NULL;
+ UCHAR cpeCnt=0, sceCnt=0, lfeCnt=0;
+
+ sampleRateIndex = getSamplingRateIndex(sampleRate);
+ if (sampleRateIndex == 15) {
+ return -1;
+ }
+
+ if ((config=getPceEntry(channelMode))==NULL) {
+ return -1;
+ }
+
+ /* Pointer to first element in element list. */
+ pEl_list = &config->el_list[0];
+
+ FDKwriteBits(hBs, instanceTagPCE, 4); /* Element instance tag */
+ FDKwriteBits(hBs, profile, 2); /* Object type */
+ FDKwriteBits(hBs, sampleRateIndex, 4); /* Sample rate index*/
+
+ FDKwriteBits(hBs, config->num_front_channel_elements, 4); /* Front channel Elements */
+ FDKwriteBits(hBs, config->num_side_channel_elements , 4); /* No Side Channel Elements */
+ FDKwriteBits(hBs, config->num_back_channel_elements , 4); /* No Back channel Elements */
+ FDKwriteBits(hBs, config->num_lfe_channel_elements , 2); /* No Lfe channel elements */
+
+ FDKwriteBits(hBs, 0, 3); /* No assoc data elements */
+ FDKwriteBits(hBs, 0, 4); /* No valid cc elements */
+ FDKwriteBits(hBs, 0, 1); /* Mono mixdown present */
+ FDKwriteBits(hBs, 0, 1); /* Stereo mixdown present */
+
+ if ( matrixMixdownA!=0 && ((channelMode==MODE_1_2_2)||(channelMode==MODE_1_2_2_1)) ) {
+ FDKwriteBits(hBs, 1, 1); /* Matrix mixdown present */
+ FDKwriteBits(hBs, (matrixMixdownA-1)&0x3, 2); /* matrix_mixdown_idx */
+ FDKwriteBits(hBs, pseudoSurroundEnable&0x1, 1); /* pseudo_surround_enable */
+ }
+ else {
+ FDKwriteBits(hBs, 0, 1); /* Matrix mixdown not present */
+ }
+
+ for(i=0; i<config->num_front_channel_elements; i++) {
+ UCHAR isCpe = (*pEl_list++==ID_CPE) ? 1 : 0;
+ UCHAR tag = (isCpe) ? cpeCnt++ : sceCnt++;
+ FDKwriteBits(hBs, isCpe, 1); /* Front channel Elements is CPE? */
+ FDKwriteBits(hBs, tag, 4); /* Front channel Instance Tag.*/
+ }
+ for(i=0; i<config->num_side_channel_elements; i++) {
+ UCHAR isCpe = (*pEl_list++==ID_CPE) ? 1 : 0;
+ UCHAR tag = (isCpe) ? cpeCnt++ : sceCnt++;
+ FDKwriteBits(hBs, isCpe, 1); /* Front channel Elements is CPE? */
+ FDKwriteBits(hBs, tag, 4); /* Front channel Instance Tag.*/
+ }
+ for(i=0; i<config->num_back_channel_elements; i++) {
+ UCHAR isCpe = (*pEl_list++==ID_CPE) ? 1 : 0;
+ UCHAR tag = (isCpe) ? cpeCnt++ : sceCnt++;
+ FDKwriteBits(hBs, isCpe, 1); /* Front channel Elements is CPE? */
+ FDKwriteBits(hBs, tag, 4); /* Front channel Instance Tag.*/
+ }
+ for(i=0; i<config->num_lfe_channel_elements; i++) {
+ FDKwriteBits(hBs, lfeCnt++, 4); /* LFE channel Instance Tag. */
+ }
+
+ /* - num_valid_cc_elements always 0.
+ - num_assoc_data_elements always 0. */
+
+ /* Byte alignment: relative to alignAnchor
+ ADTS: align with respect to the first bit of the raw_data_block()
+ ADIF: align with respect to the first bit of the header
+ LATM: align with respect to the first bit of the ASC */
+ FDKbyteAlign(hBs, alignAnchor); /* Alignment */
+
+ FDKwriteBits(hBs, 0 ,8); /* Do no write any comment. */
+
+ /* - comment_field_bytes always 0. */
+
+ return 0;
+}
+
+int transportEnc_GetPCEBits(CHANNEL_MODE channelMode,
+ int matrixMixdownA,
+ int bits)
+{
+ const PCE_CONFIGURATION* config = NULL;
+
+ if ((config=getPceEntry(channelMode))==NULL) {
+ return -1; /* unsupported channelmapping */
+ }
+
+ bits += 4 + 2 + 4; /* Element instance tag + Object type + Sample rate index */
+ bits += 4 + 4 + 4 + 2; /* No (front + side + back + lfe channel) elements */
+ bits += 3 + 4; /* No (assoc data + valid cc) elements */
+ bits += 1 + 1 + 1 ; /* Mono + Stereo + Matrix mixdown present */
+
+ if ( matrixMixdownA!=0 && ((channelMode==MODE_1_2_2)||(channelMode==MODE_1_2_2_1)) ) {
+ bits +=3; /* matrix_mixdown_idx + pseudo_surround_enable */
+ }
+
+ bits += (1+4) * (INT)config->num_front_channel_elements;
+ bits += (1+4) * (INT)config->num_side_channel_elements;
+ bits += (1+4) * (INT)config->num_back_channel_elements;
+ bits += (4) * (INT)config->num_lfe_channel_elements;
+
+ /* - num_valid_cc_elements always 0.
+ - num_assoc_data_elements always 0. */
+
+ if ((bits%8) != 0) {
+ bits += (8 - (bits%8)); /* Alignment */
+ }
+
+ bits += 8; /* Comment field bytes */
+
+ /* - comment_field_bytes alwys 0. */
+
+ return bits;
+}
+#endif /* TP_PCE_ENABLE */
+
+static void writeAot(HANDLE_FDK_BITSTREAM hBitstreamBuffer, AUDIO_OBJECT_TYPE aot)
+{
+ int tmp = (int) aot;
+
+ if (tmp > 31) {
+ FDKwriteBits( hBitstreamBuffer, AOT_ESCAPE, 5 );
+ FDKwriteBits( hBitstreamBuffer, tmp-32, 6 ); /* AudioObjectType */
+ } else {
+ FDKwriteBits( hBitstreamBuffer, tmp, 5 );
+ }
+}
+
+static void writeSampleRate(HANDLE_FDK_BITSTREAM hBitstreamBuffer, int sampleRate)
+{
+ int sampleRateIndex = getSamplingRateIndex(sampleRate);
+
+ FDKwriteBits( hBitstreamBuffer, sampleRateIndex, 4 );
+ if( sampleRateIndex == 15 ) {
+ FDKwriteBits( hBitstreamBuffer, sampleRate, 24 );
+ }
+}
+
+#ifdef TP_GA_ENABLE
+static
+int transportEnc_writeGASpecificConfig(
+ HANDLE_FDK_BITSTREAM asc,
+ CODER_CONFIG *config,
+ int extFlg,
+ UINT alignAnchor
+ )
+{
+ int aot = config->aot;
+ int samplesPerFrame = config->samplesPerFrame;
+
+ /* start of GASpecificConfig according to ISO/IEC 14496-3 Subpart 4, 4.4.1 */
+ FDKwriteBits( asc, ((samplesPerFrame==960 || samplesPerFrame==480)?1:0), 1); /* frameLengthFlag: 1 for a 960/480 (I)MDCT, 0 for a 1024/512 (I)MDCT*/
+ FDKwriteBits( asc, 0, 1); /* dependsOnCoreCoder: Sampling Rate Coder Specific, see in ISO/IEC 14496-3 Subpart 4, 4.4.1 */
+ FDKwriteBits( asc, extFlg, 1 ); /* Extension Flag: Shall be 1 for aot = 17,19,20,21,22,23 */
+
+ /* Write PCE if channel config is not 1-7 */
+ if (getChannelConfig(config->channelMode) == 0) {
+ transportEnc_writePCE(asc, config->channelMode, config->samplingRate, 0, 1, 0, 0, alignAnchor);
+ }
+ if (extFlg) {
+ if (aot == AOT_ER_BSAC) {
+ FDKwriteBits( asc, config->BSACnumOfSubFrame, 5 ); /* numOfSubFrame */
+ FDKwriteBits( asc, config->BSAClayerLength, 11 ); /* layer_length */
+ }
+ if ((aot == AOT_ER_AAC_LC) || (aot == AOT_ER_AAC_LTP) ||
+ (aot == AOT_ER_AAC_SCAL) || (aot == AOT_ER_AAC_LD))
+ {
+ FDKwriteBits( asc, (config->flags & CC_VCB11) ? 1 : 0, 1 ); /* aacSectionDataResillienceFlag */
+ FDKwriteBits( asc, (config->flags & CC_RVLC) ? 1 : 0, 1 ); /* aacScaleFactorDataResillienceFlag */
+ FDKwriteBits( asc, (config->flags & CC_HCR) ? 1 : 0, 1 ); /* aacSpectralDataResillienceFlag */
+ }
+ FDKwriteBits( asc, 0, 1 ); /* extensionFlag3: reserved. Shall be '0' */
+ }
+ return 0;
+}
+#endif /* TP_GA_ENABLE */
+
+#ifdef TP_ELD_ENABLE
+
+static
+int transportEnc_writeELDSpecificConfig(
+ HANDLE_FDK_BITSTREAM hBs,
+ CODER_CONFIG *config,
+ int epConfig,
+ int flags,
+ CSTpCallBacks *cb
+ )
+{
+ /* ELD specific config */
+ if (config->channelMode == MODE_1_1) {
+ return -1;
+ }
+ FDKwriteBits(hBs, (config->samplesPerFrame == 480) ? 1 : 0, 1);
+
+ FDKwriteBits(hBs, (flags & ASC_FLAG_VCB11) ? 1:0, 1);
+ FDKwriteBits(hBs, (flags & ASC_FLAG_RVLC ) ? 1:0, 1);
+ FDKwriteBits(hBs, (flags & ASC_FLAG_HCR ) ? 1:0, 1);
+
+ FDKwriteBits(hBs, (flags & ASC_FLAG_SBR) ? 1:0, 1); /* SBR header flag */
+ if ( (flags & ASC_FLAG_SBR) ) {
+ FDKwriteBits(hBs, (config->samplingRate == config->extSamplingRate) ? 0:1, 1); /* Samplerate Flag */
+ FDKwriteBits(hBs, (flags &ASC_FLAG_SBRCRC) ? 1:0, 1); /* SBR CRC flag*/
+
+ if (cb->cbSbr != NULL) {
+ const PCE_CONFIGURATION *pPce;
+ int e;
+
+ pPce = getPceEntry(config->channelMode);
+
+ for (e=0; e<PCE_MAX_ELEMENTS && pPce->el_list[e] != ID_NONE; e++ ) {
+ if ( (pPce->el_list[e] == ID_SCE) || (pPce->el_list[e] == ID_CPE) ) {
+ cb->cbSbr(cb->cbSbrData, hBs, 0, 0, 0, config->aot, pPce->el_list[e], e);
+ }
+ }
+ }
+ }
+
+ FDKwriteBits(hBs, 0, 4); /* ELDEXT_TERM */
+
+ return 0;
+}
+#endif /* TP_ELD_ENABLE */
+
+
+int transportEnc_writeASC (
+ HANDLE_FDK_BITSTREAM asc,
+ CODER_CONFIG *config,
+ CSTpCallBacks *cb
+ )
+{
+ UINT flags = 0;
+ int err;
+ int epConfig = 0;
+
+ /* Required for the PCE. */
+ UINT alignAnchor = FDKgetValidBits(asc);
+
+ /* Extension Flag: Shall be 1 for aot = 17,19,20,21,22,23,39 */
+ switch (config->aot) {
+ case AOT_ER_AAC_LC:
+ case AOT_ER_AAC_LTP:
+ case AOT_ER_AAC_SCAL:
+ case AOT_ER_TWIN_VQ:
+ case AOT_ER_BSAC:
+ case AOT_ER_AAC_LD:
+ case AOT_ER_AAC_ELD:
+ case AOT_USAC:
+ flags |= ASC_FLAG_EXT;
+ break;
+ default:
+ break;
+ }
+ if (config->flags & CC_SBR) {
+ flags |= ASC_FLAG_SBR;
+ }
+
+ if (config->extAOT == AOT_SBR || config->extAOT == AOT_PS)
+ writeAot(asc, config->extAOT);
+ else
+ writeAot(asc, config->aot);
+
+ {
+ writeSampleRate(asc, config->samplingRate);
+ }
+
+ /* Try to guess a reasonable channel mode if not given */
+ if (config->channelMode == MODE_INVALID) {
+ config->channelMode = transportEnc_GetChannelMode(config->noChannels);
+ if (config->channelMode == MODE_INVALID)
+ return -1;
+ }
+
+ FDKwriteBits( asc, getChannelConfig(config->channelMode), 4 );
+
+ if (config->extAOT == AOT_SBR || config->extAOT == AOT_PS) {
+ writeSampleRate(asc, config->extSamplingRate);
+ writeAot(asc, config->aot);
+ }
+
+ switch (config->aot) {
+#ifdef TP_GA_ENABLE
+ case AOT_AAC_MAIN:
+ case AOT_AAC_LC:
+ case AOT_AAC_SSR:
+ case AOT_AAC_LTP:
+ case AOT_AAC_SCAL:
+ case AOT_TWIN_VQ:
+ case AOT_ER_AAC_LC:
+ case AOT_ER_AAC_LTP:
+ case AOT_ER_AAC_SCAL:
+ case AOT_ER_TWIN_VQ:
+ case AOT_ER_BSAC:
+ case AOT_ER_AAC_LD:
+ err = transportEnc_writeGASpecificConfig(asc, config, (flags & ASC_FLAG_EXT) ? 1:0, alignAnchor);
+ if (err)
+ return err;
+ break;
+#endif /* TP_GA_ENABLE */
+#ifdef TP_ELD_ENABLE
+ case AOT_ER_AAC_ELD:
+ err = transportEnc_writeELDSpecificConfig(asc, config, epConfig, flags, cb);
+ if (err)
+ return err;
+ break;
+#endif /* TP_ELD_ENABLE */
+ default:
+ return -1;
+ }
+
+ switch (config->aot) {
+ case AOT_ER_AAC_LC:
+ case AOT_ER_AAC_LTP:
+ case AOT_ER_AAC_SCAL:
+ case AOT_ER_TWIN_VQ:
+ case AOT_ER_BSAC:
+ case AOT_ER_AAC_LD:
+ case AOT_ER_CELP:
+ case AOT_ER_HVXC:
+ case AOT_ER_HILN:
+ case AOT_ER_PARA:
+ case AOT_ER_AAC_ELD:
+ FDKwriteBits( asc, 0, 2 ); /* epconfig 0 */
+ break;
+ default:
+ break;
+ }
+
+ /* Make sure all bits are sync'ed */
+ FDKsyncCache( asc );
+
+ return 0;
+}