| /* |
| * Copyright (C) 2009 The Android Open Source Project |
| * |
| * 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. |
| */ |
| |
| /*------------------------------------------------------------------------------ |
| |
| Table of contents |
| |
| 1. Include headers |
| 2. External compiler flags |
| 3. Module defines |
| 4. Local function prototypes |
| 5. Functions |
| h264bsdDecodeNalUnit |
| |
| ------------------------------------------------------------------------------*/ |
| |
| /*------------------------------------------------------------------------------ |
| 1. Include headers |
| ------------------------------------------------------------------------------*/ |
| |
| #include "h264bsd_nal_unit.h" |
| #include "h264bsd_util.h" |
| |
| /*------------------------------------------------------------------------------ |
| 2. External compiler flags |
| -------------------------------------------------------------------------------- |
| |
| -------------------------------------------------------------------------------- |
| 3. Module defines |
| ------------------------------------------------------------------------------*/ |
| |
| /*------------------------------------------------------------------------------ |
| 4. Local function prototypes |
| ------------------------------------------------------------------------------*/ |
| |
| /*------------------------------------------------------------------------------ |
| |
| Function name: h264bsdDecodeNalUnit |
| |
| Functional description: |
| Decode NAL unit header information |
| |
| Inputs: |
| pStrmData pointer to stream data structure |
| |
| Outputs: |
| pNalUnit NAL unit header information is stored here |
| |
| Returns: |
| HANTRO_OK success |
| HANTRO_NOK invalid NAL unit header information |
| |
| ------------------------------------------------------------------------------*/ |
| |
| u32 h264bsdDecodeNalUnit(strmData_t *pStrmData, nalUnit_t *pNalUnit) |
| { |
| |
| /* Variables */ |
| |
| u32 tmp; |
| |
| /* Code */ |
| |
| ASSERT(pStrmData); |
| ASSERT(pNalUnit); |
| ASSERT(pStrmData->bitPosInWord == 0); |
| |
| /* forbidden_zero_bit (not checked to be zero, errors ignored) */ |
| tmp = h264bsdGetBits(pStrmData, 1); |
| /* Assuming that NAL unit starts from byte boundary > don't have to check |
| * following 7 bits for END_OF_STREAM */ |
| if (tmp == END_OF_STREAM) |
| return(HANTRO_NOK); |
| |
| tmp = h264bsdGetBits(pStrmData, 2); |
| pNalUnit->nalRefIdc = tmp; |
| |
| tmp = h264bsdGetBits(pStrmData, 5); |
| pNalUnit->nalUnitType = (nalUnitType_e)tmp; |
| |
| /* data partitioning NAL units not supported */ |
| if ( (tmp == 2) || (tmp == 3) || (tmp == 4) ) |
| { |
| return(HANTRO_NOK); |
| } |
| |
| /* nal_ref_idc shall not be zero for these nal_unit_types */ |
| if ( ( (tmp == NAL_SEQ_PARAM_SET) || (tmp == NAL_PIC_PARAM_SET) || |
| (tmp == NAL_CODED_SLICE_IDR) ) && (pNalUnit->nalRefIdc == 0) ) |
| { |
| return(HANTRO_NOK); |
| } |
| /* nal_ref_idc shall be zero for these nal_unit_types */ |
| else if ( ( (tmp == NAL_SEI) || (tmp == NAL_ACCESS_UNIT_DELIMITER) || |
| (tmp == NAL_END_OF_SEQUENCE) || (tmp == NAL_END_OF_STREAM) || |
| (tmp == NAL_FILLER_DATA) ) && (pNalUnit->nalRefIdc != 0) ) |
| { |
| return(HANTRO_NOK); |
| } |
| |
| return(HANTRO_OK); |
| |
| } |
| |