| /* ------------------------------------------------------------------ |
| * Copyright (C) 1998-2009 PacketVideo |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either |
| * express or implied. |
| * See the License for the specific language governing permissions |
| * and limitations under the License. |
| * ------------------------------------------------------------------- |
| */ |
| /* |
| |
| Filename: extractframeInfo.c |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| |
| Who: Date: MM/DD/YYYY |
| Description: |
| |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| Arguments: hBitBuf - bitbuffer handle |
| v_frame_info - pointer to memorylocation where the frame-info will |
| be stored. |
| |
| Return: none. |
| |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| Extracts a frame_info vector from control data read from the bitstream. |
| |
| ------------------------------------------------------------------------------ |
| REQUIREMENTS |
| |
| |
| ------------------------------------------------------------------------------ |
| REFERENCES |
| |
| SC 29 Software Copyright Licencing Disclaimer: |
| |
| This software module was originally developed by |
| Coding Technologies |
| |
| and edited by |
| - |
| |
| in the course of development of the ISO/IEC 13818-7 and ISO/IEC 14496-3 |
| standards for reference purposes and its performance may not have been |
| optimized. This software module is an implementation of one or more tools as |
| specified by the ISO/IEC 13818-7 and ISO/IEC 14496-3 standards. |
| ISO/IEC gives users free license to this software module or modifications |
| thereof for use in products claiming conformance to audiovisual and |
| image-coding related ITU Recommendations and/or ISO/IEC International |
| Standards. ISO/IEC gives users the same free license to this software module or |
| modifications thereof for research purposes and further ISO/IEC standardisation. |
| Those intending to use this software module in products are advised that its |
| use may infringe existing patents. ISO/IEC have no liability for use of this |
| software module or modifications thereof. Copyright is not released for |
| products that do not conform to audiovisual and image-coding related ITU |
| Recommendations and/or ISO/IEC International Standards. |
| The original developer retains full right to modify and use the code for its |
| own purpose, assign or donate the code to a third party and to inhibit third |
| parties from using the code for products that do not conform to audiovisual and |
| image-coding related ITU Recommendations and/or ISO/IEC International Standards. |
| This copyright notice must be included in all copies or derivative works. |
| Copyright (c) ISO/IEC 2002. |
| |
| ------------------------------------------------------------------------------ |
| PSEUDO-CODE |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; INCLUDES |
| ----------------------------------------------------------------------------*/ |
| |
| #ifdef AAC_PLUS |
| |
| |
| #include "extractframeinfo.h" |
| #include "buf_getbits.h" |
| #include "aac_mem_funcs.h" |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; MACROS |
| ; Define module specific macros here |
| ----------------------------------------------------------------------------*/ |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; DEFINES |
| ; Include all pre-processor statements here. Include conditional |
| ; compile variables also. |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; LOCAL FUNCTION DEFINITIONS |
| ; Function Prototype declaration |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; LOCAL STORE/BUFFER/POINTER DEFINITIONS |
| ; Variable declaration - defined here and used outside this module |
| ----------------------------------------------------------------------------*/ |
| |
| |
| /* |
| * (int) ceil (log (bs_num_env + 1) / log (2)) |
| * ceil(log([0:5]+1)/log(2)) |
| */ |
| |
| const Int32 bs_pointer_bits_tbl[MAX_ENVELOPES + 1] = { 0, 1, 2, 2, 3, 3}; |
| |
| /* |
| * (int)((float)numTimeSlots/bs_num_env + 0.5f) |
| * floor(16./[0:5] + 0.5) |
| */ |
| |
| const Int32 T_16_ov_bs_num_env_tbl[MAX_ENVELOPES + 1] = { 2147483647, 16, 8, |
| 5, 4, 3 |
| }; |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; EXTERNAL FUNCTION REFERENCES |
| ; Declare functions defined elsewhere and referenced in this module |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES |
| ; Declare variables used in this module but defined elsewhere |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; FUNCTION CODE |
| ----------------------------------------------------------------------------*/ |
| |
| |
| SBR_ERROR extractFrameInfo(BIT_BUFFER * hBitBuf, |
| SBR_FRAME_DATA * h_frame_data) |
| { |
| |
| Int32 absBordLead = 0; |
| Int32 nRelLead = 0; |
| Int32 nRelTrail = 0; |
| Int32 bs_num_env = 0; |
| Int32 bs_num_rel = 0; |
| Int32 bs_var_bord = 0; |
| Int32 bs_var_bord_0 = 0; |
| Int32 bs_var_bord_1 = 0; |
| Int32 bs_pointer = 0; |
| Int32 bs_pointer_bits; |
| Int32 frameClass; |
| Int32 temp; |
| Int32 env; |
| Int32 k; |
| Int32 bs_num_rel_0 = 0; |
| Int32 bs_num_rel_1 = 0; |
| Int32 absBordTrail = 0; |
| Int32 middleBorder = 0; |
| Int32 bs_num_noise; |
| Int32 lA = 0; |
| |
| Int32 tE[MAX_ENVELOPES + 1]; |
| Int32 tQ[2 + 1]; |
| Int32 f[MAX_ENVELOPES + 1]; |
| Int32 bs_rel_bord[3]; |
| Int32 bs_rel_bord_0[3]; |
| Int32 bs_rel_bord_1[3]; |
| Int32 relBordLead[3]; |
| Int32 relBordTrail[3]; |
| |
| |
| Int32 *v_frame_info = h_frame_data->frameInfo; |
| |
| SBR_ERROR err = SBRDEC_OK; |
| |
| |
| /* |
| * First read from the bitstream. |
| */ |
| |
| /* Read frame class */ |
| h_frame_data->frameClass = frameClass = buf_getbits(hBitBuf, SBR_CLA_BITS); |
| |
| |
| switch (frameClass) |
| { |
| |
| case FIXFIX: |
| temp = buf_getbits(hBitBuf, SBR_ENV_BITS); /* 2 bits */ |
| |
| bs_num_env = 1 << temp; |
| |
| |
| f[0] = buf_getbits(hBitBuf, SBR_RES_BITS); /* 1 bit */ |
| |
| for (env = 1; env < bs_num_env; env++) |
| { |
| f[env] = f[0]; |
| } |
| |
| nRelLead = bs_num_env - 1; |
| absBordTrail = 16; |
| |
| |
| break; |
| |
| case FIXVAR: |
| bs_var_bord = buf_getbits(hBitBuf, SBR_ABS_BITS); /* 2 bits */ |
| bs_num_rel = buf_getbits(hBitBuf, SBR_NUM_BITS); /* 2 bits */ |
| bs_num_env = bs_num_rel + 1; |
| |
| for (k = 0; k < bs_num_env - 1; k++) |
| { |
| bs_rel_bord[k] = (buf_getbits(hBitBuf, SBR_REL_BITS) + 1) << 1; |
| } |
| |
| bs_pointer_bits = bs_pointer_bits_tbl[bs_num_env]; |
| |
| bs_pointer = buf_getbits(hBitBuf, bs_pointer_bits); |
| |
| for (env = 0; env < bs_num_env; env++) |
| { /* 1 bit */ |
| f[bs_num_env - 1 - env] = buf_getbits(hBitBuf, SBR_RES_BITS); |
| } |
| |
| absBordTrail = 16 + bs_var_bord; |
| nRelTrail = bs_num_rel; |
| |
| break; |
| |
| case VARFIX: |
| bs_var_bord = buf_getbits(hBitBuf, SBR_ABS_BITS); /* 2 bits */ |
| bs_num_rel = buf_getbits(hBitBuf, SBR_NUM_BITS); /* 2 bits */ |
| bs_num_env = bs_num_rel + 1; |
| |
| for (k = 0; k < bs_num_env - 1; k++) |
| { |
| bs_rel_bord[k] = (buf_getbits(hBitBuf, SBR_REL_BITS) + 1) << 1; |
| } |
| |
| bs_pointer_bits = bs_pointer_bits_tbl[bs_num_env]; |
| |
| bs_pointer = buf_getbits(hBitBuf, bs_pointer_bits); |
| |
| for (env = 0; env < bs_num_env; env++) |
| { /* 1 bit */ |
| f[env] = buf_getbits(hBitBuf, SBR_RES_BITS); |
| } |
| |
| absBordTrail = 16; |
| absBordLead = bs_var_bord; |
| nRelLead = bs_num_rel; |
| |
| break; |
| |
| case VARVAR: |
| bs_var_bord_0 = buf_getbits(hBitBuf, SBR_ABS_BITS); /* 2 bits */ |
| bs_var_bord_1 = buf_getbits(hBitBuf, SBR_ABS_BITS); |
| bs_num_rel_0 = buf_getbits(hBitBuf, SBR_NUM_BITS); /* 2 bits */ |
| bs_num_rel_1 = buf_getbits(hBitBuf, SBR_NUM_BITS); |
| |
| bs_num_env = bs_num_rel_0 + bs_num_rel_1 + 1; |
| |
| for (k = 0; k < bs_num_rel_0; k++) |
| { /* 2 bits */ |
| bs_rel_bord_0[k] = (buf_getbits(hBitBuf, SBR_REL_BITS) + 1) << 1; |
| } |
| |
| for (k = 0; k < bs_num_rel_1; k++) |
| { /* 2 bits */ |
| bs_rel_bord_1[k] = (buf_getbits(hBitBuf, SBR_REL_BITS) + 1) << 1; |
| } |
| |
| |
| bs_pointer_bits = bs_pointer_bits_tbl[bs_num_env]; |
| |
| bs_pointer = buf_getbits(hBitBuf, bs_pointer_bits); |
| |
| for (env = 0; env < bs_num_env; env++) |
| { /* 1 bit */ |
| f[env] = buf_getbits(hBitBuf, SBR_RES_BITS); |
| } |
| |
| absBordLead = bs_var_bord_0; |
| absBordTrail = 16 + bs_var_bord_1; |
| nRelLead = bs_num_rel_0; |
| nRelTrail = bs_num_rel_1; |
| |
| break; |
| |
| }; |
| |
| |
| /* |
| * Calculate the framing. |
| */ |
| |
| |
| switch (frameClass) |
| { |
| case FIXFIX: |
| for (k = 0; k < nRelLead; k++) |
| { |
| relBordLead[k] = T_16_ov_bs_num_env_tbl[bs_num_env]; |
| } |
| break; |
| case VARFIX: |
| for (k = 0; k < nRelLead; k++) |
| { |
| relBordLead[k] = bs_rel_bord[k]; |
| } |
| break; |
| case VARVAR: |
| for (k = 0; k < nRelLead; k++) |
| { |
| relBordLead[k] = bs_rel_bord_0[k]; |
| } |
| for (k = 0; k < nRelTrail; k++) |
| { |
| relBordTrail[k] = bs_rel_bord_1[k]; |
| } |
| break; |
| case FIXVAR: |
| for (k = 0; k < nRelTrail; k++) |
| { |
| relBordTrail[k] = bs_rel_bord[k]; |
| } |
| break; |
| } |
| |
| |
| tE[0] = absBordLead; |
| tE[bs_num_env] = absBordTrail; |
| |
| for (env = 1; env <= nRelLead; env++) |
| { |
| tE[env] = absBordLead; |
| for (k = 0; k <= env - 1; k++) |
| { |
| tE[env] += relBordLead[k]; |
| } |
| } |
| |
| for (env = nRelLead + 1; env < bs_num_env; env++) |
| { |
| tE[env] = absBordTrail; |
| for (k = 0; k <= bs_num_env - env - 1; k++) |
| { |
| tE[env] -= relBordTrail[k]; |
| } |
| } |
| |
| |
| |
| switch (frameClass) |
| { |
| case FIXFIX: |
| middleBorder = bs_num_env >> 1; |
| break; |
| case VARFIX: |
| switch (bs_pointer) |
| { |
| case 0: |
| middleBorder = 1; |
| break; |
| case 1: |
| middleBorder = bs_num_env - 1; |
| break; |
| default: |
| middleBorder = bs_pointer - 1; |
| break; |
| }; |
| break; |
| case FIXVAR: |
| case VARVAR: |
| switch (bs_pointer) |
| { |
| case 0: |
| case 1: |
| middleBorder = bs_num_env - 1; |
| break; |
| default: |
| middleBorder = bs_num_env + 1 - bs_pointer; |
| break; |
| }; |
| break; |
| }; |
| |
| |
| tQ[0] = tE[0]; |
| if (bs_num_env > 1) |
| { |
| tQ[1] = tE[middleBorder]; |
| tQ[2] = tE[bs_num_env]; |
| bs_num_noise = 2; |
| } |
| else |
| { |
| tQ[1] = tE[bs_num_env]; |
| bs_num_noise = 1; |
| } |
| |
| /* |
| * Check consistency on freq bands |
| */ |
| |
| if ((tE[bs_num_env] < tE[0]) || (tE[0] < 0)) |
| { |
| err = SBRDEC_INVALID_BITSTREAM; |
| } |
| |
| |
| switch (frameClass) |
| { |
| case FIXFIX: |
| lA = -1; |
| break; |
| case VARFIX: |
| switch (bs_pointer) |
| { |
| case 0: |
| case 1: |
| lA = -1; |
| break; |
| default: |
| lA = bs_pointer - 1; |
| break; |
| }; |
| break; |
| case FIXVAR: |
| case VARVAR: |
| switch (bs_pointer) |
| { |
| case 0: |
| lA = - 1; |
| break; |
| default: |
| lA = bs_num_env + 1 - bs_pointer; |
| break; |
| }; |
| break; |
| }; |
| |
| /* |
| * Build the frameInfo vector... |
| */ |
| |
| v_frame_info[0] = bs_num_env; /* Number of envelopes*/ |
| pv_memcpy(v_frame_info + 1, tE, (bs_num_env + 1)*sizeof(Int32)); /* time borders*/ |
| /* frequency resolution */ |
| pv_memcpy(v_frame_info + 1 + bs_num_env + 1, f, bs_num_env*sizeof(Int32)); |
| |
| temp = (1 + bs_num_env) << 1; |
| v_frame_info[temp] = lA; /* transient envelope*/ |
| v_frame_info[temp + 1] = bs_num_noise; /* Number of noise envelopes */ |
| /* noise borders */ |
| pv_memcpy(v_frame_info + temp + 2, tQ, (bs_num_noise + 1)*sizeof(Int32)); |
| |
| |
| return (err); |
| |
| } |
| |
| |
| |
| |
| |
| |
| #endif |
| |
