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Diffstat (limited to 'media/libstagefright/codecs/aacdec/extractframeinfo.cpp')
| -rw-r--r-- | media/libstagefright/codecs/aacdec/extractframeinfo.cpp | 487 |
1 files changed, 487 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/aacdec/extractframeinfo.cpp b/media/libstagefright/codecs/aacdec/extractframeinfo.cpp new file mode 100644 index 0000000..571cc98 --- /dev/null +++ b/media/libstagefright/codecs/aacdec/extractframeinfo.cpp @@ -0,0 +1,487 @@ +/* ------------------------------------------------------------------ + * 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 + |