static void writeSampleRate(HANDLE_FDK_BITSTREAM hBitstreamBuffer, int sampleRate)
{
int sampleRateIndex = getSamplingRateIndex(sampleRate);
FDKwriteBits( hBitstreamBuffer, sampleRateIndex, 4 );
if( sampleRateIndex == 15 ) {
FDKwriteBits( hBitstreamBuffer, sampleRate, 24 );
}
}
INT adtsWrite_Init(HANDLE_ADTS hAdts, CODER_CONFIG *config)
{
/* Sanity checks */
if ( config->nSubFrames < 1
|| config->nSubFrames > 4
|| (int)config->aot > 4
|| (int)config->aot < 1 ) {
return -1;
}
/* fixed header */
if (config->flags & CC_MPEG_ID) {
hAdts->mpeg_id = 0; /* MPEG 4 */
} else {
hAdts->mpeg_id = 1; /* MPEG 2 */
}
hAdts->layer=0;
hAdts->protection_absent = ! (config->flags & CC_PROTECTION);
hAdts->profile = ((int)config->aot) - 1;
hAdts->sample_freq_index = getSamplingRateIndex(config->samplingRate);
hAdts->sample_freq = config->samplingRate;
hAdts->private_bit=0;
hAdts->channel_mode = config->channelMode;
hAdts->original=0;
hAdts->home=0;
/* variable header */
hAdts->copyright_id=0;
hAdts->copyright_start=0;
hAdts->num_raw_blocks=config->nSubFrames-1; /* 0 means 1 raw data block */
FDKcrcInit(&hAdts->crcInfo, 0x8005, 0xFFFF, 16);
hAdts->currentBlock = 0;
return 0;
}
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;
}
