void get_dse(
Char *DataStreamBytes,
BITS *pInputStream)
{
Int i;
Int data_byte_align_flag;
UInt count;
Int esc_count;
Char *pDataStreamBytes;
pDataStreamBytes = DataStreamBytes;
/*
* Get element instance tag ( 4 bits)
* ( max of 16 per raw data block)
*/
get9_n_lessbits(LEN_TAG, pInputStream);
/*
* get data_byte_align_flag ( 1 bit0 to see if byte alignment is
* performed within the DSE
*/
data_byte_align_flag = get1bits(pInputStream);
/*
* get count ( 8 bits)
*/
count = get9_n_lessbits(LEN_D_CNT, pInputStream);
/*
* if count == 255, its value it is incremented by a
* second 8 bit value, esc_count. This final value represents
* the number of bytes in the DSE
*/
if (count == (1 << LEN_D_CNT) - 1)
{
esc_count = (Int)get9_n_lessbits(LEN_D_ESC, pInputStream); /* 8 bits */
count += esc_count;
}
/*
* Align if flag is set
*/
if (data_byte_align_flag)
{
byte_align(pInputStream);
}
for (i = count; i != 0; i--)
{
*(pDataStreamBytes++) = (Char) get9_n_lessbits(
LEN_BYTE,
pInputStream);
}
return;
} /* end get_dse */
Int get_prog_config(
tDec_Int_File *pVars,
ProgConfig *pScratchPCE)
{
Int i;
UInt tag;
Int numChars;
UInt temp;
Bool flag;
Int status = SUCCESS;
BITS *pInputStream = &(pVars->inputStream);
/*
* The tag is used at the very end to see if this PCE is
* the one to be used. Otherwise it does not need to be saved for the
* the simple configurations to be used in this version of an AAC
* decoder.
*
* All of the bits of this PCE must be read even if this PCE will not
* be used. They are read into a temporary PCE, then later it is decided
* whether to keep this PCE.
*
* To allow quick removal of the fields from the ProgConfig structure
* that will probably not be used at a later date,
* while still advancing the bitstream pointer,the return value of
* getbits is saved into a temporary variable, then transfered to
* the structure item.
*/
tag = get9_n_lessbits(LEN_TAG, pInputStream);
pScratchPCE->profile = get9_n_lessbits(LEN_PROFILE, pInputStream);
pScratchPCE->sampling_rate_idx = get9_n_lessbits(LEN_SAMP_IDX, pInputStream);
if (!pVars->adif_test && (pScratchPCE->sampling_rate_idx != pVars->prog_config.sampling_rate_idx))
{
#ifdef AAC_PLUS
/*
* PCE carries the baseline frequency, if SBR or PS are used, the frequencies will not match
* so check for this unique case, and let decoding continue if this is a redundant PCE
*/
if ((pScratchPCE->sampling_rate_idx != (pVars->prog_config.sampling_rate_idx + 3)) ||
(pVars->mc_info.upsamplingFactor != 2))
#endif
{
/* rewind the pointer as implicit channel configuration maybe the case */
pInputStream->usedBits -= (LEN_TAG + LEN_PROFILE + LEN_SAMP_IDX);
return (1); /* mismatch cannot happen */
}
}
/*
* Retrieve the number of element lists for each of
* front, side, back, lfe, data, and coupling.
*
* For two-channel stereo or mono, only the data in the front needs
* to be saved. However, ALL fields need to be skipped over in some
* fashion. Also, the number of elements needs to be temporarily saved
* to call get_ele_list(). If that function was changed to pass in
* the number of points to be read, the memory set aside inside the
* ProgConfig structure could be removed.
*/
/*
* The next six function calls could be combined into one, then use
* shifts and masks to retrieve the individual fields.
*/
temp = get9_n_lessbits(LEN_NUM_ELE, pInputStream);
pScratchPCE->front.num_ele = temp;
/* Needed only to read in the element list. */
temp = get9_n_lessbits(LEN_NUM_ELE, pInputStream);
pScratchPCE->side.num_ele = temp;
/* Needed only to read in the element list. */
temp = get9_n_lessbits(LEN_NUM_ELE, pInputStream);
pScratchPCE->back.num_ele = temp;
/* Needed only to read in the element list. */
temp = get9_n_lessbits(LEN_NUM_LFE, pInputStream);
pScratchPCE->lfe.num_ele = temp;
/* Needed only to read in the element list. */
temp = get9_n_lessbits(LEN_NUM_DAT, pInputStream);
pScratchPCE->data.num_ele = temp;
/* Needed only to read in the element list. */
temp = get9_n_lessbits(LEN_NUM_CCE, pInputStream);
pScratchPCE->coupling.num_ele = temp;
/*
* Read in mix down data.
*
* Whether these fields can be removed and have proper operation
* will be determined at a later date.
*/
/* Read presence of mono_mix */
flag = get1bits(pInputStream);/* LEN_MIX_PRES,*/
pScratchPCE->mono_mix.present = flag;
if (flag != FALSE)
{
temp = get9_n_lessbits(LEN_TAG, pInputStream);
pScratchPCE->mono_mix.ele_tag = temp;
} /* end if (flag != FALSE) */
/* Read presence of stereo mix */
flag = get1bits(pInputStream); /* LEN_MIX_PRES,*/
pScratchPCE->stereo_mix.present = flag;
if (flag != FALSE)
{
temp = get9_n_lessbits(LEN_TAG, pInputStream);
pScratchPCE->stereo_mix.ele_tag = temp;
} /* end if (flag != FALSE) */
/* Read presence of matrix mix */
flag = get1bits(pInputStream); /* LEN_MIX_PRES,*/
pScratchPCE->matrix_mix.present = flag;
if (flag != FALSE)
{
temp = get9_n_lessbits(LEN_MMIX_IDX, pInputStream);
pScratchPCE->matrix_mix.ele_tag = temp;
temp = get1bits(pInputStream); /* LEN_PSUR_ENAB,*/
pScratchPCE->matrix_mix.pseudo_enab = temp;
} /* end if (flag != FALSE) */
/*
* Get each of the element lists. Only the front information will be
* used for the PV decoder, but the usedBits field of pInputStream must
* be advanced appropriately.
*
* This could be optimized by advancing the bit stream for the
* elements that do not need to be read.
*/
get_ele_list(&pScratchPCE->front,
pInputStream,
TRUE);
get_ele_list(&pScratchPCE->side,
pInputStream,
TRUE);
get_ele_list(&pScratchPCE->back,
pInputStream,
TRUE);
get_ele_list(&pScratchPCE->lfe,
pInputStream,
FALSE);
get_ele_list(&pScratchPCE->data,
pInputStream,
FALSE);
get_ele_list(&pScratchPCE->coupling,
pInputStream,
TRUE);
/*
* The standard requests a byte alignment before reading in the
* comment. This can be done because LEN_COMMENT_BYTES == 8.
*/
byte_align(pInputStream);
numChars = get9_n_lessbits(LEN_COMMENT_BYTES, pInputStream);
/*
* Ignore the comment - it requires 65 bytes to store (or worse on DSP).
* If this field is restored, make sure to append a trailing '\0'
*/
for (i = numChars; i > 0; i--)
{
pScratchPCE->comments[i] = (Char) get9_n_lessbits(LEN_BYTE,
pInputStream);
} /* end for */
if (pVars->current_program < 0)
{
/*
* If this is the first PCE, it becomes the current, regardless of
* its tag number.
*/
pVars->current_program = tag;
pVars->mc_info.ch_info[0].tag = 0;
} /* end if (pVars->current_program < 0) */
if (tag == (UInt)pVars->current_program)
{
/*
* This branch is reached under two conditions:
* 1) This is the first PCE found, it was selected in the above if
* block. In all encoders found thus far, the tag value has been
* zero.
* 2) A PCE has been sent by the encoder with a tag that matches the
* the first one sent. It will then be re-read. No encoder found
*
* Regardless, the temporary PCE will now be copied into the
* the one official program configuration.
*/
/*
* Keep adts setting in case of a redundant PCE (only applicable when
* using aac-lib own adts parser)
*/
pScratchPCE->file_is_adts = pVars->prog_config.file_is_adts;
pScratchPCE->headerless_frames = pVars->prog_config.headerless_frames;
pv_memcpy(&pVars->prog_config,
pScratchPCE,
sizeof(ProgConfig));
tag = 0;
/*
* Check that dual-mono does not carry more than 2 tracks, otherwise flag an non-supported error
*/
if ((pVars->prog_config.front.num_ele > 2) && !(pVars->prog_config.front.ele_is_cpe[tag]))
{
status = 1;
}
/*
* Check that stereo does not carry more than 1 track, otherwise flag an non-supported error
*/
if ((pVars->prog_config.front.num_ele > 1) && (pVars->prog_config.front.ele_is_cpe[tag]))
{
status = 1;
}
if (!status)
{
/* enter configuration into MC_Info structure */
status = set_mc_info(&pVars->mc_info,
(tMP4AudioObjectType)(pVars->prog_config.profile + 1),
pVars->prog_config.sampling_rate_idx,
pVars->prog_config.front.ele_tag[tag],
pVars->prog_config.front.ele_is_cpe[tag],
pVars->winmap,
pVars->SFBWidth128);
if (pVars->mc_info.upsamplingFactor == 2)
{
/*
* prog_config.sampling_rate_idx corresponds to the aac base layer,
* if the upsampling factor is active, then the output frequency needs
* to be adjusted accordingly
*/
pVars->prog_config.sampling_rate_idx -= 3;
}
}
} /* end if (tag == pVars->current_program) */
return (status);
}
bool VC2Decoder::parseSeqHeader(char *_idata) {
#define EXPECT_VAL(N) { uint32_t d = read_uint(idata, bits);\
if (d != (N)) {\
writelog(LOG_WARN, "%s:%d: Expected %d, got %d when parsing sequence header\n", __FILE__, __LINE__, (N), d); \
}\
}
uint8_t *idata = (uint8_t *)_idata;
if ((!mSeqHeaderEncoded) || mSeqHeaderEncodedLength == 0 || (memcmp(mSeqHeaderEncoded, idata, mSeqHeaderEncodedLength) != 0)) {
writelog(LOG_INFO, "Processing Sequence Header");
int bits = 7;
EXPECT_VAL(2);
EXPECT_VAL(0);
EXPECT_VAL(3);
int level = read_uint(idata, bits);
if (level != 3 && level != 6) {
writelog(LOG_WARN, "%s:%d: Expected 3 or 6, got %d when reading level\n", __FILE__, __LINE__, level);
}
VC2DecoderParamsInternal params;
params = mParams;
params.video_format.base_video_format = read_uint(idata, bits);
params.video_format.custom_dimensions_flag = read_bool(idata, bits);
if (params.video_format.custom_dimensions_flag) {
params.video_format.frame_width = read_uint(idata, bits);
params.video_format.frame_height = read_uint(idata, bits);
}
params.video_format.custom_color_diff_format_flag = read_bool(idata, bits);
if (params.video_format.custom_color_diff_format_flag) {
params.video_format.color_diff_format_index = read_uint(idata, bits);
}
params.video_format.custom_scan_format_flag = read_bool(idata, bits);
if (params.video_format.custom_scan_format_flag) {
params.video_format.source_sampling = read_uint(idata, bits);
}
params.video_format.custom_frame_rate_flag = read_bool(idata, bits);
if (params.video_format.custom_frame_rate_flag) {
params.video_format.frame_rate_index = read_uint(idata, bits);
if (params.video_format.frame_rate_index == 0) {
params.video_format.frame_rate_numer = read_uint(idata, bits);
params.video_format.frame_rate_denom = read_uint(idata, bits);
}
}
params.video_format.custom_pixel_aspect_ratio_flag = read_bool(idata, bits);
if (params.video_format.custom_pixel_aspect_ratio_flag) {
params.video_format.pixel_aspect_ratio_index = read_uint(idata, bits);
if (params.video_format.pixel_aspect_ratio_index == 0) {
params.video_format.pixel_aspect_ratio_numer = read_uint(idata, bits);
params.video_format.pixel_aspect_ratio_denom = read_uint(idata, bits);
}
}
params.video_format.custom_clean_area_flag = read_bool(idata, bits);
if (params.video_format.custom_clean_area_flag) {
params.video_format.clean_width = read_uint(idata, bits);
params.video_format.clean_height = read_uint(idata, bits);
params.video_format.left_offset = read_uint(idata, bits);
params.video_format.top_offset = read_uint(idata, bits);
}
params.video_format.custom_signal_range_flag = read_bool(idata, bits);
if (params.video_format.custom_signal_range_flag) {
params.video_format.signal_range_index = read_uint(idata, bits);
if (params.video_format.signal_range_index == 0) {
params.video_format.luma_offset = read_uint(idata, bits);
params.video_format.luma_excursion = read_uint(idata, bits);
params.video_format.color_diff_offset = read_uint(idata, bits);
params.video_format.color_diff_excursion = read_uint(idata, bits);
}
}
params.video_format.custom_color_spec_flag = read_bool(idata, bits);
if (params.video_format.custom_color_spec_flag) {
params.video_format.color_spec_index = read_uint(idata, bits);
if (params.video_format.color_spec_index == 0) {
params.video_format.custom_color_primaries_flag = read_bool(idata, bits);
if (params.video_format.custom_color_primaries_flag) {
params.video_format.color_primaries_index = read_uint(idata, bits);
}
params.video_format.custom_color_matrix_flag = read_bool(idata, bits);
if (params.video_format.custom_color_matrix_flag) {
params.video_format.color_matrix_index = read_uint(idata, bits);
}
params.video_format.custom_transfer_function_flag = read_bool(idata, bits);
if (params.video_format.custom_transfer_function_flag) {
params.video_format.transfer_function_index = read_uint(idata, bits);
}
}
}
uint32_t picture_coding_mode = read_uint(idata, bits);
mInterlaced = (picture_coding_mode != 0);
mParams = params;
mConfigured = false;
setVideoFormat(mParams);
byte_align(idata, bits);
if (mSeqHeaderEncoded)
delete[] mSeqHeaderEncoded;
mSeqHeaderEncodedLength = idata - (uint8_t *)_idata;
mSeqHeaderEncoded = new uint8_t[mSeqHeaderEncodedLength];
memcpy(mSeqHeaderEncoded, _idata, mSeqHeaderEncodedLength);
mSequenceInfo.video_format = params.video_format;
mSequenceInfo.picture_coding_mode = picture_coding_mode;
mSequenceInfo.sequence_headers_seen++;
return true;
}
return false;
}
int VC2Decoder::processTransformParams(uint8_t *_idata, int ilength) {
(void)ilength;
uint8_t *idata = (uint8_t *)_idata;
if (!mConfigured || !mTransformParamsEncoded || mTransformParamsEncodedLength == 0 || memcmp(mTransformParamsEncoded, idata, mTransformParamsEncodedLength)) {
writelog(LOG_INFO, "Processing Transform Params");
int bits = 7;
VC2DecoderTransformParams transform_params;
transform_params.wavelet_index = read_uint(idata, bits);
transform_params.wavelet_depth = read_uint(idata, bits);
transform_params.slices_x = read_uint(idata, bits);
transform_params.slices_y = read_uint(idata, bits);
int prefix_bytes = read_uint(idata, bits);
int slice_size_scalar = read_uint(idata, bits);
transform_params.custom_quant_matrix_flag = read_bool(idata, bits);
if (transform_params.custom_quant_matrix_flag) {
transform_params.quant_matrix_LL = read_uint(idata, bits);
for (int l = 0; l < (int)transform_params.wavelet_depth - 1; l++) {
transform_params.quant_matrix_HL[l] = read_uint(idata, bits);
transform_params.quant_matrix_LH[l] = read_uint(idata, bits);
transform_params.quant_matrix_HH[l] = read_uint(idata, bits);
}
}
byte_align(idata, bits);
mTransformParamsEncodedLength = (idata - (uint8_t*)_idata);
if (mTransformParamsEncoded)
delete[] mTransformParamsEncoded;
mTransformParamsEncoded = new uint8_t[mTransformParamsEncodedLength];
memcpy(mTransformParamsEncoded, _idata, mTransformParamsEncodedLength);
VC2DecoderParamsInternal params = mParams;
params.transform_params = transform_params;
params.slice_size_scalar = slice_size_scalar;
params.slice_prefix_bytes = prefix_bytes;
setParams(params);
mSequenceInfo.transform_params = transform_params;
mConfigured = true;
#ifdef DEBUG
{
printf("--------------------------------------------------------------------\n");
printf(" Picture Header Stream Data\n");
printf("--------------------------------------------------------------------\n");
uint8_t *data = (uint8_t *)&_idata;
for (int y = 0; y * 16 < mTransformParamsEncodedLength; y++) {
printf(" ");
for (int x = 0; x < 16 && y * 16 + x < mTransformParamsEncodedLength; x++) {
printf(" %02x", data[y * 16 + x]);
}
printf("\n");
}
printf("--------------------------------------------------------------------\n");
}
#endif
}
else {
idata += mTransformParamsEncodedLength;
}
return idata - _idata;
}
OSCL_EXPORT_REF int32 GetActualAacConfig(uint8* aConfigHeader,
uint8* aAudioObjectType,
int32* aConfigHeaderSize,
uint8* SamplingRateIndex,
uint32* NumChannels)
{
tPVMP4AudioDecoderExternal * iAACDecExt = NULL;
UInt initialUsedBits; /* Unsigned for C55x */
tDec_Int_File *pVars; /* Helper pointer */
MC_Info *pMC_Info; /* Helper pointer */
Int status = ERROR_BUFFER_OVERRUN;
/*
* Allocate memory to decode one AAC frame
*/
if (!iAACDecExt)
{
iAACDecExt = new tPVMP4AudioDecoderExternal;
if (!iAACDecExt)
{
return 1;
}
iAACDecExt->inputBufferCurrentLength = 0;
}
iAACDecExt->pInputBuffer = aConfigHeader;
iAACDecExt->inputBufferMaxLength = PVMP4AUDIODECODER_INBUFSIZE;
iAACDecExt->inputBufferUsedLength = 0;
iAACDecExt->remainderBits = 0;
int32 memreq = PVMP4AudioDecoderGetMemRequirements();
uint8 *pMem = OSCL_ARRAY_NEW(uint8 , memreq);
if (pMem == 0)
{
return KCODEC_INIT_FAILURE;
}
if (PVMP4AudioDecoderInitLibrary(iAACDecExt, pMem) != 0)
{
return KCODEC_INIT_FAILURE;
}
iAACDecExt->inputBufferCurrentLength = *aConfigHeaderSize;
/*
* Initialize "helper" pointers to existing memory.
*/
pVars = (tDec_Int_File *)pMem;
pMC_Info = &pVars->mc_info;
/*
* Translate input buffer variables.
*/
pVars->inputStream.pBuffer = iAACDecExt->pInputBuffer;
pVars->inputStream.availableBits =
(UInt)(iAACDecExt->inputBufferCurrentLength << INBUF_ARRAY_INDEX_SHIFT);
initialUsedBits =
(UInt)((iAACDecExt->inputBufferUsedLength << INBUF_ARRAY_INDEX_SHIFT) +
iAACDecExt->remainderBits);
pVars->inputStream.inputBufferCurrentLength =
(UInt)iAACDecExt->inputBufferCurrentLength;
pVars->inputStream.usedBits = initialUsedBits;
pVars->aacPlusEnabled = true; /* Always enable aacplus decoding */
if (initialUsedBits <= pVars->inputStream.availableBits)
{
/*
* Buffer is not overrun, then
* decode the AudioSpecificConfig() structure
*/
status = get_audio_specific_config(pVars);
}
byte_align(&pVars->inputStream);
*aConfigHeaderSize = (Int32)((pVars->inputStream.usedBits) >> 3);
*SamplingRateIndex = pVars->prog_config.sampling_rate_idx;
*NumChannels = pVars->mc_info.nch;
*aAudioObjectType = pVars->mc_info.audioObjectType;
/*
* Set parameters based on the explicit information from the
* audio specific config
*/
if (pVars->mc_info.sbrPresentFlag)
{
if (pVars->mc_info.psPresentFlag)
{
*NumChannels += 1;
}
}
pVars->status = status;
/*
* Clear allocated memory
*/
if (pMem != NULL)
{
OSCL_ARRAY_DELETE(pMem);
pMem = NULL;
}
if (iAACDecExt)
{
OSCL_DELETE(iAACDecExt);
iAACDecExt = NULL;
}
return status;
}
