/*****************************************************************************
functionname: encodeSbrGrid
description: if hBitStream != NULL writes bits that describes the
time/frequency grouping of a frame; else counts them only
returns: number of bits written or counted
input:
output:
*****************************************************************************/
static INT encodeSbrGrid(HANDLE_SBR_ENV_DATA sbrEnvData,
HANDLE_FDK_BITSTREAM hBitStream) {
INT payloadBits = 0;
INT i, temp;
INT bufferFrameStart = sbrEnvData->hSbrBSGrid->bufferFrameStart;
INT numberTimeSlots = sbrEnvData->hSbrBSGrid->numberTimeSlots;
if (sbrEnvData->ldGrid)
payloadBits += FDKwriteBits(hBitStream, sbrEnvData->hSbrBSGrid->frameClass,
SBR_CLA_BITS_LD);
else
payloadBits += FDKwriteBits(hBitStream, sbrEnvData->hSbrBSGrid->frameClass,
SBR_CLA_BITS);
switch (sbrEnvData->hSbrBSGrid->frameClass) {
case FIXFIXonly:
FDK_ASSERT(0 /* Fatal error in encodeSbrGrid! */);
break;
case FIXFIX:
temp = ceil_ln2(sbrEnvData->hSbrBSGrid->bs_num_env);
payloadBits += FDKwriteBits(hBitStream, temp, SBR_ENV_BITS);
if ((sbrEnvData->ldGrid) && (sbrEnvData->hSbrBSGrid->bs_num_env == 1))
payloadBits += FDKwriteBits(hBitStream, sbrEnvData->currentAmpResFF,
SI_SBR_AMP_RES_BITS);
payloadBits += FDKwriteBits(hBitStream, sbrEnvData->hSbrBSGrid->v_f[0],
SBR_RES_BITS);
break;
case FIXVAR:
case VARFIX:
if (sbrEnvData->hSbrBSGrid->frameClass == FIXVAR)
temp = sbrEnvData->hSbrBSGrid->bs_abs_bord -
(bufferFrameStart + numberTimeSlots);
else
temp = sbrEnvData->hSbrBSGrid->bs_abs_bord - bufferFrameStart;
payloadBits += FDKwriteBits(hBitStream, temp, SBR_ABS_BITS);
payloadBits +=
FDKwriteBits(hBitStream, sbrEnvData->hSbrBSGrid->n, SBR_NUM_BITS);
for (i = 0; i < sbrEnvData->hSbrBSGrid->n; i++) {
temp = (sbrEnvData->hSbrBSGrid->bs_rel_bord[i] - 2) >> 1;
payloadBits += FDKwriteBits(hBitStream, temp, SBR_REL_BITS);
}
temp = ceil_ln2(sbrEnvData->hSbrBSGrid->n + 2);
payloadBits += FDKwriteBits(hBitStream, sbrEnvData->hSbrBSGrid->p, temp);
for (i = 0; i < sbrEnvData->hSbrBSGrid->n + 1; i++) {
payloadBits += FDKwriteBits(hBitStream, sbrEnvData->hSbrBSGrid->v_f[i],
SBR_RES_BITS);
}
break;
case VARVAR:
temp = sbrEnvData->hSbrBSGrid->bs_abs_bord_0 - bufferFrameStart;
payloadBits += FDKwriteBits(hBitStream, temp, SBR_ABS_BITS);
temp = sbrEnvData->hSbrBSGrid->bs_abs_bord_1 -
(bufferFrameStart + numberTimeSlots);
payloadBits += FDKwriteBits(hBitStream, temp, SBR_ABS_BITS);
payloadBits += FDKwriteBits(
hBitStream, sbrEnvData->hSbrBSGrid->bs_num_rel_0, SBR_NUM_BITS);
payloadBits += FDKwriteBits(
hBitStream, sbrEnvData->hSbrBSGrid->bs_num_rel_1, SBR_NUM_BITS);
for (i = 0; i < sbrEnvData->hSbrBSGrid->bs_num_rel_0; i++) {
temp = (sbrEnvData->hSbrBSGrid->bs_rel_bord_0[i] - 2) >> 1;
payloadBits += FDKwriteBits(hBitStream, temp, SBR_REL_BITS);
}
for (i = 0; i < sbrEnvData->hSbrBSGrid->bs_num_rel_1; i++) {
temp = (sbrEnvData->hSbrBSGrid->bs_rel_bord_1[i] - 2) >> 1;
payloadBits += FDKwriteBits(hBitStream, temp, SBR_REL_BITS);
}
temp = ceil_ln2(sbrEnvData->hSbrBSGrid->bs_num_rel_0 +
sbrEnvData->hSbrBSGrid->bs_num_rel_1 + 2);
payloadBits += FDKwriteBits(hBitStream, sbrEnvData->hSbrBSGrid->p, temp);
temp = sbrEnvData->hSbrBSGrid->bs_num_rel_0 +
sbrEnvData->hSbrBSGrid->bs_num_rel_1 + 1;
for (i = 0; i < temp; i++) {
payloadBits += FDKwriteBits(
hBitStream, sbrEnvData->hSbrBSGrid->v_fLR[i], SBR_RES_BITS);
}
break;
}
return payloadBits;
}
/*****************************************************************************
description: Encode SBR grid information
*****************************************************************************/
static int
encodeSbrGrid (HANDLE_SBR_ENV_DATA sbrEnvData, HANDLE_BIT_BUF hBitStream)
{
int payloadBits = 0;
int i, temp;
/* counting previous operations */
payloadBits += WriteBits (hBitStream, sbrEnvData->hSbrBSGrid->frameClass,
SBR_CLA_BITS);
switch (sbrEnvData->hSbrBSGrid->frameClass) {
case FIXFIX:
temp = ceil_ln2(sbrEnvData->hSbrBSGrid->bs_num_env);
payloadBits += WriteBits (hBitStream, temp, SBR_ENV_BITS);
payloadBits += WriteBits (hBitStream, sbrEnvData->freq_res_fixfix, SBR_RES_BITS);
break;
case FIXVAR:
case VARFIX:
if (sbrEnvData->hSbrBSGrid->frameClass == FIXVAR)
{
temp = sbrEnvData->hSbrBSGrid->bs_abs_bord - 16;
}
else
{
temp = sbrEnvData->hSbrBSGrid->bs_abs_bord;
}
payloadBits += WriteBits (hBitStream, temp, SBR_ABS_BITS);
payloadBits += WriteBits (hBitStream, sbrEnvData->hSbrBSGrid->n, SBR_NUM_BITS);
/* sbrEnvData->hSbrBSGrid->bs_rel_bord[] */
for (i = 0; i < sbrEnvData->hSbrBSGrid->n; i++) {
temp = (sbrEnvData->hSbrBSGrid->bs_rel_bord[i] - 2) >> 1;
payloadBits += WriteBits (hBitStream, temp, SBR_REL_BITS);
}
temp = ceil_ln2(sbrEnvData->hSbrBSGrid->n + 2);
payloadBits += WriteBits (hBitStream, sbrEnvData->hSbrBSGrid->p, temp);
/* sbrEnvData->hSbrBSGrid->v_f[] */
for (i = 0; i < sbrEnvData->hSbrBSGrid->n + 1; i++) {
payloadBits += WriteBits (hBitStream, sbrEnvData->hSbrBSGrid->v_f[i],
SBR_RES_BITS);
}
break;
case VARVAR:
temp = sbrEnvData->hSbrBSGrid->bs_abs_bord_0;
payloadBits += WriteBits (hBitStream, temp, SBR_ABS_BITS);
temp = sbrEnvData->hSbrBSGrid->bs_abs_bord_1 - 16;
payloadBits += WriteBits (hBitStream, temp, SBR_ABS_BITS);
payloadBits += WriteBits (hBitStream, sbrEnvData->hSbrBSGrid->bs_num_rel_0, SBR_NUM_BITS);
payloadBits += WriteBits (hBitStream, sbrEnvData->hSbrBSGrid->bs_num_rel_1, SBR_NUM_BITS);
/* sbrEnvData->hSbrBSGrid->bs_rel_bord_0[] */
for (i = 0; i < sbrEnvData->hSbrBSGrid->bs_num_rel_0; i++) {
temp = (sbrEnvData->hSbrBSGrid->bs_rel_bord_0[i] - 2) >> 1;
payloadBits += WriteBits (hBitStream, temp, SBR_REL_BITS);
}
/* sbrEnvData->hSbrBSGrid->bs_rel_bord_1[] */
for (i = 0; i < sbrEnvData->hSbrBSGrid->bs_num_rel_1; i++) {
temp = (sbrEnvData->hSbrBSGrid->bs_rel_bord_1[i] - 2) >> 1;
payloadBits += WriteBits (hBitStream, temp, SBR_REL_BITS);
}
temp = ceil_ln2(sbrEnvData->hSbrBSGrid->bs_num_rel_0 +
sbrEnvData->hSbrBSGrid->bs_num_rel_1 + 2);
payloadBits += WriteBits (hBitStream, sbrEnvData->hSbrBSGrid->p, temp);
temp = sbrEnvData->hSbrBSGrid->bs_num_rel_0 +
sbrEnvData->hSbrBSGrid->bs_num_rel_1 + 1;
/* sbrEnvData->hSbrBSGrid->v_fLR[] */
for (i = 0; i < temp; i++) {
payloadBits += WriteBits (hBitStream, sbrEnvData->hSbrBSGrid->v_fLR[i],
SBR_RES_BITS);
}
break;
}
return payloadBits;
}