static int get_prog_config(BitData *bf, ProgConfig *p)
{
int tag;
p->nChannels = 0;
tag = GetBits(bf, 4);
p->profile = GetBits(bf, 2);
p->sampling_rate_idx = GetBits(bf, 4);
p->front.num_ele = GetBits(bf, 4);
p->side.num_ele = GetBits(bf, 4);
p->back.num_ele = GetBits(bf, 4);
p->lfe.num_ele = GetBits(bf, 2);
p->data.num_ele = GetBits(bf, 3);
p->coupling.num_ele = GetBits(bf, 4);
if ( ( p->mono_mix.present = GetBits(bf, 1) ) == 1 )
p->mono_mix.ele_tag = GetBits(bf, 4);
if ( ( p->stereo_mix.present = GetBits(bf, 1) ) == 1 )
p->stereo_mix.ele_tag = GetBits(bf, 4);
if ( ( p->matrix_mix.present = GetBits(bf, 1) ) == 1 )
{
p->matrix_mix.ele_tag = GetBits(bf, 2);
p->matrix_mix.pseudo_enab = GetBits(bf, 1);
}
p->nChannels += get_ele_list(bf, &p->front, 1);
p->nChannels += get_ele_list(bf, &p->side, 1);
p->nChannels += get_ele_list(bf, &p->back, 1);
p->nChannels += get_ele_list(bf, &p->lfe, 0);
return 1;
}
int get_prog_config(faacDecHandle hDecoder, ProgConfig *p)
{
int i, j, tag;
tag = faad_getbits(&hDecoder->ld, LEN_TAG);
p->object_type = faad_getbits(&hDecoder->ld, LEN_OBJECTTYPE);
p->sampling_rate_idx = faad_getbits(&hDecoder->ld, LEN_SAMP_IDX);
p->front.num_ele = faad_getbits(&hDecoder->ld, LEN_NUM_ELE);
p->side.num_ele = faad_getbits(&hDecoder->ld, LEN_NUM_ELE);
p->back.num_ele = faad_getbits(&hDecoder->ld, LEN_NUM_ELE);
p->lfe.num_ele = faad_getbits(&hDecoder->ld, LEN_NUM_LFE);
p->data.num_ele = faad_getbits(&hDecoder->ld, LEN_NUM_DAT);
p->coupling.num_ele = faad_getbits(&hDecoder->ld, LEN_NUM_CCE);
if ((p->mono_mix.present = faad_getbits(&hDecoder->ld, LEN_MIX_PRES)) == 1)
p->mono_mix.ele_tag = faad_getbits(&hDecoder->ld, LEN_TAG);
if ((p->stereo_mix.present = faad_getbits(&hDecoder->ld, LEN_MIX_PRES)) == 1)
p->stereo_mix.ele_tag = faad_getbits(&hDecoder->ld, LEN_TAG);
if ((p->matrix_mix.present = faad_getbits(&hDecoder->ld, LEN_MIX_PRES)) == 1) {
p->matrix_mix.ele_tag = faad_getbits(&hDecoder->ld, LEN_MMIX_IDX);
p->matrix_mix.pseudo_enab = faad_getbits(&hDecoder->ld, LEN_PSUR_ENAB);
}
get_ele_list(hDecoder, &p->front, 1);
get_ele_list(hDecoder, &p->side, 1);
get_ele_list(hDecoder, &p->back, 1);
get_ele_list(hDecoder, &p->lfe, 0);
get_ele_list(hDecoder, &p->data, 0);
get_ele_list(hDecoder, &p->coupling, 1);
/*
* if this is a MPEG4 file and the PCE is inside a raw_data_block()
* this should be aligned to beginning of raw_data_block() boundary,
* not byte boundary (FIXME!!!)
*/
faad_byte_align(&hDecoder->ld);
j = faad_getbits(&hDecoder->ld, LEN_COMMENT_BYTES);
for (i=0; i<j; i++)
p->comments[i] = (char)faad_getbits(&hDecoder->ld, LEN_BYTE);
p->comments[i] = 0; /* null terminator for string */
/* activate new program configuration if appropriate */
if (hDecoder->current_program < 0)
hDecoder->current_program = tag; /* always select new program */
if (tag == hDecoder->current_program) {
/* enter configuration into MC_Info structure */
if ((hDecoder->pceChannels = enter_mc_info(hDecoder, &hDecoder->mc_info, p)) < 0)
return -1;
/* inhibit default configuration */
hDecoder->default_config = 0;
}
return tag;
}
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);
}
