/**
Same as previous but without SliceIGroup table.
*/
void PpsSliceGroupHeaderCut(unsigned char *data, int *Position, PPS *pt_pps)
{
int i;
int iGroup;
if ( pt_pps -> num_slice_groups_minus1 > 0 ) {
pt_pps -> slice_group_map_type = (unsigned char) read_ue(data, Position);
if ( pt_pps -> slice_group_map_type == 0 )
for ( iGroup = 0 ; iGroup <= pt_pps -> num_slice_groups_minus1 ; iGroup++ )
pt_pps -> run_length_minus1 [iGroup] = (short) read_ue(data, Position);
else if ( pt_pps -> slice_group_map_type == 2 )
for ( iGroup = 0 ; iGroup < pt_pps -> num_slice_groups_minus1 ; iGroup++ ) {
pt_pps -> top_left_tab [iGroup] = (short) read_ue(data, Position);//
pt_pps -> bottom_right_tab [iGroup] = (short) read_ue(data, Position);//
}
else if ( pt_pps -> slice_group_map_type == 3 || pt_pps -> slice_group_map_type == 4
|| pt_pps -> slice_group_map_type == 5 ) {
pt_pps -> slice_group_change_direction_flag = (unsigned char) getNbits(data, Position, 1);
pt_pps -> slice_group_change_rate_minus1 = (short) read_ue(data, Position) + 1;
} else if ( pt_pps -> slice_group_map_type == 6 ) {
short log2_num_slice_groups_minus1 = (short) log_base2(pt_pps -> num_slice_groups_minus1 + 1);
short pic_size_in_map_units_minus1 = (short) read_ue(data, Position);
for ( i = 0 ; i <= pic_size_in_map_units_minus1 ; i++ ) {
getNbits(data, Position, log2_num_slice_groups_minus1);
}
}
}
}
void seq_parameter_set( unsigned char *data, SPS *sps){
int position = 8;
int profile_idc = getNbits(data, &position, 8);
int constraint = getNbits(data, &position, 8);
int level_idc = getNbits(data, &position, 8); //level_idc =
if (profile_idc && !(constraint & 0xf)){
char Sps_id = read_ue(data, &position);
char seq_parameter_set_id = CLIP3(0, SPS_BUF_SIZE, Sps_id);
SPS *pt_sps = &sps [seq_parameter_set_id];
//To save parameter before resetting
short b_stride = pt_sps -> b_stride;
short b8_stride = pt_sps -> b8_stride;
//Initialization of the maximun number of sps
if(seq_parameter_set_id > sps[0] . MaxSpsId){
sps[0] . MaxSpsId = seq_parameter_set_id;
}
//Intilaize the SPS to zero
memset(pt_sps, 0, sizeof(SPS));
pt_sps -> b_stride = b_stride;
pt_sps -> b8_stride = b8_stride;
pt_sps -> profile_idc = profile_idc;
pt_sps -> level_idc = level_idc;
seq_parameter_set_data(data, &position, pt_sps);
pt_sps -> slice_header_restriction_flag = -1;
rbsp_trailing_bits(&position);
}
}
/**
Parses the rest of header.
*/
void PpsEndOfHeader(unsigned char *data, int *Position, PPS *pt_pps)
{
pt_pps -> num_RefIdxL0_active_minus1 = (unsigned char) read_ue(data, Position);
pt_pps -> num_RefIdxL1_active_minus1 = (unsigned char) read_ue(data, Position);
pt_pps -> WeightedPredFlag = (unsigned char) getNbits(data, Position, 1);
pt_pps -> WeightedBipredIdc = (unsigned char) getNbits(data, Position, 2); //pt_pps -> weighted_bipred_idc =
pt_pps -> pic_init_qp = (unsigned char) (read_se(data, Position) + 26);
read_se(data, Position); //pic_init_qs_minus26 =
pt_pps -> second_chroma_qp_index_offset = pt_pps -> chroma_qp_index_offset = (char) read_se(data, Position);
pt_pps -> deblocking_filter_control_present_flag = (unsigned char) getNbits(data, Position, 1);
pt_pps -> constrained_intra_pred_flag = (unsigned char) getNbits(data, Position, 1);
pt_pps -> redundant_pic_cnt_present_flag = (unsigned char) getNbits(data, Position, 1);
}
ERROR_CODE pvmp3_frame_synch(tPVMP3DecoderExternal *pExt,
void *pMem) /* bit stream structure */
{
uint16 val;
ERROR_CODE err;
tmp3dec_file *pVars;
pVars = (tmp3dec_file *)pMem;
pVars->inputStream.pBuffer = pExt->pInputBuffer;
pVars->inputStream.usedBits = (pExt->inputBufferUsedLength << 3); // in bits
pVars->inputStream.inputBufferCurrentLength = (pExt->inputBufferCurrentLength); // in bits
err = pvmp3_header_sync(&pVars->inputStream);
if (err == NO_DECODING_ERROR)
{
/* validate synchronization by checking two consecutive sync words */
// to avoid multiple bitstream accesses
uint32 temp = getNbits(&pVars->inputStream, 21);
// put back whole header
pVars->inputStream.usedBits -= 21 + SYNC_WORD_LNGTH;
int32 version;
switch (temp >> 19) /* 2 */
{
case 0:
version = MPEG_2_5;
break;
case 2:
version = MPEG_2;
break;
case 3:
version = MPEG_1;
break;
default:
version = INVALID_VERSION;
break;
}
int32 freq_index = (temp << 20) >> 30;
if (version != INVALID_VERSION && (freq_index != 3))
{
int32 numBytes = fxp_mul32_Q28(mp3_bitrate[version][(temp<<16)>>28] << 20,
inv_sfreq[freq_index]);
numBytes >>= (20 - version);
if (version != MPEG_1)
{
numBytes >>= 1;
}
/**
Parses the additional information.
*/
void PpsHighProfile(unsigned char *data, int *Position, PPS *pt_pps, SPS *pt_sps)
{
pt_pps -> transform_8x8_mode_flag = (unsigned char) getNbits(data, Position, 1);
decode_scaling_matrices(data, Position, pt_sps, 0, pt_pps -> scaling_matrix4, pt_pps -> scaling_matrix8);
pt_pps -> second_chroma_qp_index_offset = (char) read_se(data, Position);
if ( abs(pt_pps -> second_chroma_qp_index_offset) > 12){
pt_pps -> second_chroma_qp_index_offset = pt_pps -> chroma_qp_index_offset;
}
}
void DecRefBasePicMarking(unsigned char *data, int *position, MMO *Mmo, SPS *sps, NAL *Nal) {
if (getNbits(data, position, 1) ) {
int BaseDependency = (Nal -> DqId >> 4) - 1;
int LayerId = GetLayerNumber(Nal, BaseDependency << 4);
LAYER_MMO *LayerMmo = &Mmo -> LayerMMO [LayerId];
GetMMCOOperationCode(sps, LayerMmo, data, position);
SetDecRefLayer(Nal, Mmo, LayerMmo, BaseDependency);
}
void ParseIPCM(const unsigned char *ai_pcData, int *Position, RESIDU *picture_residu, unsigned char *NonZeroCountCache){
int i;
for ( i = 0 ; i < 256 /** ChromaFormatFactor */; i++ ) {
picture_residu -> LumaLevel[i] = (short) getNbits(ai_pcData, Position, 8);
}
for ( i = 0 ; i < 64 /** ChromaFormatFactor */; i++ ) {
picture_residu -> ChromaACLevel_Cb[i] = (short) getNbits(ai_pcData, Position, 8);
}
for ( i = 0 ; i < 64 /** ChromaFormatFactor */; i++ ) {
picture_residu -> ChromaACLevel_Cr[i] = (short) getNbits(ai_pcData, Position, 8);
}
init_mb_IPCM(NonZeroCountCache);
picture_residu -> Qp = 0;
}
/**
This function permits to get from the NAL unit additional parameters.
@param data The NAL unit.
@param position The current position in the NAL.
*/
void hrd_parameters ( unsigned char *data, int *position, SPS *sps )
{
int SchedSelIdx ;
sps -> cpb_cnt = read_ue(data, position) + 1;
getNbits(data, position, 4);//bit_rate_scale =
getNbits(data, position, 4);// cpb_size_scale =
for ( SchedSelIdx = 0 ; SchedSelIdx <= sps -> cpb_cnt -1 ; SchedSelIdx++ ) {
read_ue(data, position);// /* bit_rate_value_minus1 [SchedSelIdx] = */
read_ue(data, position);///* cpb_size_value_minus1 [SchedSelIdx] = */
getNbits(data, position, 1);///* cbr_flag [SchedSelIdx] = */
}
sps -> initial_cpb_removal_delay_length = getNbits(data, position, 5) + 1;
sps -> cpb_removal_delay_length = getNbits(data, position, 5) + 1;// =
getNbits(data, position, 5);// dpb_output_delay_length_minus1 =
sps -> time_offset_length = getNbits(data, position, 5);//time_offset_length =
}
/**
Parses first data of pps.
*/
void PpsFirstHeader(unsigned char *data, int *Position, PPS *pt_pps)
{
pt_pps -> entropy_coding_mode_flag = (unsigned char) getNbits(data, Position, 1);
pt_pps -> pic_order_present_flag = (unsigned char) getNbits(data, Position, 1);
pt_pps -> num_slice_groups_minus1 = (unsigned char) read_ue(data, Position);
}
//for init access unit
int slice_header_svc_cut(unsigned char *data, SPS *sps, PPS *pps, int *position,
SLICE *Slice, NAL *Nal)
{
PPS *pt_pps_id ;
SPS *pt_sps_id ;
int PicParameterId;
int SeqParameterId;
//Read header data
Slice -> first_mb_in_slice = read_ue(data, position);
Slice -> slice_type = read_ue(data, position);
if ( Slice -> slice_type > 4 ) {
Slice -> slice_type -= 5 ;
}
PicParameterId = read_ue(data, position);
Nal -> pic_parameter_id[Nal -> LayerId] = PicParameterId = CLIP3(0, PPS_BUF_SIZE - 1, PicParameterId);
pt_pps_id = &pps[PicParameterId];
//Should be in slice header
//Sometimes Subset SPS are after PPS (rtsp)
if(pt_pps_id -> seq_parameter_set_id > sps[0] . MaxSpsId){
pt_pps_id -> seq_parameter_set_id = sps[0] . MaxSpsId;
}
SeqParameterId = pt_pps_id -> seq_parameter_set_id + (Nal -> LayerId ? 16: 0);
pt_sps_id = &sps[SeqParameterId];
Slice -> frame_num = getNbits(data, position, pt_sps_id -> log2_max_frame_num );
//Read Frame parameter
if ( !pt_sps_id -> frame_mbs_only_flag ) {
Slice -> field_pic_flag = getNbits(data, position, 1);
if ( Slice -> field_pic_flag ) {
Slice->bottom_field_flag = getNbits(data, position, 1);
}
}
else
{
Slice->field_pic_flag = 0;
}
if ( 1 == Nal -> IdrFlag) {
Slice->idr_pic_id = read_ue(data, position);//idr_pic_id =
}
if ( pt_sps_id -> pic_order_cnt_type == 0 ) {
Slice -> pic_order_cnt_lsb = getNbits(data, position, pt_sps_id -> log2_max_pic_order_cnt_lsb );
if ( pt_pps_id -> pic_order_present_flag && !Slice -> field_pic_flag )
Slice -> delta_pic_order_cnt_bottom = read_se(data, position);
}
if ( pt_sps_id -> pic_order_cnt_type == 1 && !pt_sps_id -> delta_pic_order_always_zero_flag ) {
Slice -> delta_pic_order_cnt [0] = read_se(data, position);
if ( pt_pps_id -> pic_order_present_flag && !Slice -> field_pic_flag )
Slice -> delta_pic_order_cnt [1] = read_se(data, position);
}
if ( pt_pps_id -> redundant_pic_cnt_present_flag ) {
read_ue(data, position);//redundant_pic_cnt =
}
return 0;
}
/**
This function permits to decode from the bitstream the Sequence Parameter Set NAL unit.
All the parameters decoded will be stored in the sps structure.
@param data The NAL unit.
@param position The current position in the NAL.
@param NalBytesInNalunit The sizes of the NAL unit in bytes.
@param sps The sps structure which contains all parameters decoded in this NAL.
*/
void seq_parameter_set_data ( unsigned char *data, int *position, SPS *pt_sps){
int i = 0 ;
if( pt_sps -> profile_idc == 100 || pt_sps -> profile_idc == 110 ||
pt_sps -> profile_idc == 122 || pt_sps -> profile_idc == 244 ||
pt_sps -> profile_idc == 44 || pt_sps -> profile_idc == 83 || pt_sps -> profile_idc == 86 ) {
pt_sps -> chroma_format_idc = read_ue(data, position);
if( pt_sps -> chroma_format_idc == 3 ){
getNbits(data, position, 1);//separate_colour_plane_flag
}
pt_sps -> bit_depth_luma = read_ue(data, position) + 8;
pt_sps -> bit_depth_chroma = read_ue(data, position) + 8;
getNbits(data, position, 1);//qpprime_y_zero_transform_bypass_flag
decode_scaling_matrices(data, position, pt_sps,1, pt_sps -> scaling_matrix4 , pt_sps -> scaling_matrix8);
}
pt_sps -> log2_max_frame_num = read_ue(data, position) + 4;
pt_sps -> pic_order_cnt_type = read_ue(data, position);
if ( pt_sps -> pic_order_cnt_type == 0 ) {
pt_sps -> log2_max_pic_order_cnt_lsb = read_ue(data, position) + 4;
} else if ( pt_sps -> pic_order_cnt_type == 1 ) {
pt_sps -> delta_pic_order_always_zero_flag = getNbits(data, position, 1);
pt_sps -> offset_for_non_ref_pic = read_se(data, position);
pt_sps -> offset_for_top_to_bottom_field = read_se(data, position);
pt_sps -> num_ref_frames_in_pic_order_cnt_cycle = read_ue(data, position);
for (; i < pt_sps -> num_ref_frames_in_pic_order_cnt_cycle ; i++ ) {
pt_sps -> offset_for_ref_frame [i] = read_se(data, position);
}
}
pt_sps -> num_ref_frames = read_ue(data, position);//
getNbits(data, position, 1);//gaps_in_frame_num_value_allowed_flag =
pt_sps -> pic_width_in_mbs = read_ue(data, position) + 1;
pt_sps -> pic_height_in_map_units = read_ue(data, position) + 1;
pt_sps -> frame_mbs_only_flag = getNbits(data, position, 1);
pt_sps -> PicSizeInMbs = pt_sps -> pic_width_in_mbs * pt_sps -> pic_height_in_map_units;
if ( !pt_sps -> frame_mbs_only_flag ) {
pt_sps -> MbAdaptiveFrameFieldFlag = getNbits(data, position, 1);
}
//To initialize the number of decoded frame before displaying.
get_max_dpb(pt_sps);
pt_sps -> direct_8x8_inference_flag = getNbits(data, position, 1);
if ( getNbits(data, position, 1)) {//frame_cropping_flag
pt_sps -> CropLeft = (read_ue(data, position)) << 1;//frame_crop_left_offset =
pt_sps -> CropRight = (read_ue(data, position)) << 1;//frame_crop_right_offset =
pt_sps -> CropTop = (read_ue(data, position)) << 1;//frame_crop_top_offset =
pt_sps -> CropBottom = (read_ue(data, position)) << 1;//frame_crop_bottom_offset =
}
if ( getNbits(data, position, 1) ) {
vui_parameters(data, position, pt_sps);
}
}
int macroblock_layer_in_scalable_extension(const NAL *Nal, const PPS *Pps, RESIDU *Current_residu, RESIDU *BaseResidu,
const unsigned char *ai_pcData, int *position, const SLICE *ai_pstSlice,
DATA Tab_Block[], const VLC_TABLES *vlc, unsigned char aio_tiNon_zero_count_cache [ ],
unsigned char aio_tiSlice_table [ ], const short iMb_x, const short iMb_y,
int direct_8x8_inference_flag, int *last_QP)
{
int noSubMbPartSizeLessThan8x8;
int BaseModeFlag = 0;
const int iCurrMbAddr = iMb_x + iMb_y * (short)(ai_pstSlice -> mb_stride);
short intra4x4_pred_mode_cache[40];
DATA * aio_pstBlock = &Tab_Block[iCurrMbAddr];
//TODO
if( ai_pstSlice -> AdaptiveBaseModeFlag && Current_residu -> InCropWindow) {
Current_residu -> BaseModeFlag = BaseModeFlag = getNbits(ai_pcData, position, 1); //u(1)
}else if (ai_pstSlice -> DefaultBaseModeFlag){
Current_residu -> BaseModeFlag = BaseModeFlag = 1;
}
if(!BaseModeFlag){
int mb_type = read_ue(ai_pcData, position);
//According to the slice type and the macroblock type
//the parameters are adjusted
switch ( ai_pstSlice -> slice_type )
{
case EI :
#ifdef ERROR_DETECTION
//Error detection
if(ErrorsCheckMbType(mb_type, I_BL)){
return 1;
}
#endif
aio_pstBlock -> MbPartPredMode [0] = i_mb_type_info[mb_type] . type;
Current_residu -> MbType = i_mb_type_info[mb_type] . type;
Current_residu -> Cbp = i_mb_type_info[mb_type] . Cbp;
Current_residu -> Intra16x16PredMode = i_mb_type_info[mb_type] . pred_mode;
break ;
case EP :
if (mb_type < 5){
#ifdef ERROR_DETECTION
//Error detection
if(ErrorsCheckMbType(mb_type, P_BL)){
return 1;
}
#endif
aio_pstBlock -> NumMbPart = p_mb_type_info[mb_type] . partcount;
aio_pstBlock -> MbPartPredMode [0] = p_mb_type_info[mb_type] . type_0;
aio_pstBlock -> MbPartPredMode [1] = p_mb_type_info[mb_type] . type_1;
Current_residu -> MbType = p_mb_type_info[mb_type] . name;
Current_residu -> Mode = p_mb_type_info[mb_type] . Mode;
}
else {
mb_type -= 5;
#ifdef ERROR_DETECTION
//Error detection
if(ErrorsCheckMbType(mb_type, I_BL)){
return 1;
}
#endif
aio_pstBlock -> MbPartPredMode [0] = i_mb_type_info[mb_type] . type;
Current_residu -> MbType = i_mb_type_info[mb_type] . type;
Current_residu -> Cbp = i_mb_type_info[mb_type] . Cbp;
Current_residu -> Intra16x16PredMode = i_mb_type_info[mb_type] . pred_mode;
}
break ;
case EB :
if (mb_type < 23) {
#ifdef ERROR_DETECTION
//Error detection
if(ErrorsCheckMbType(mb_type, B_BL)){
return 1;
}
#endif
aio_pstBlock -> NumMbPart = b_mb_type_info[mb_type] . partcount;
aio_pstBlock -> MbPartPredMode [0] = b_mb_type_info[mb_type] . type_0;
aio_pstBlock -> MbPartPredMode [1] = b_mb_type_info[mb_type] . type_1;
Current_residu -> MbType = b_mb_type_info[mb_type] . name;
Current_residu -> Mode = b_mb_type_info[mb_type] . Mode;
}
else {
mb_type -= 23;
#ifdef ERROR_DETECTION
//Error detection
if(ErrorsCheckMbType(mb_type, I_BL)){
return 1;
}
#endif
aio_pstBlock -> MbPartPredMode [0] = i_mb_type_info[mb_type] . type;
Current_residu -> MbType = i_mb_type_info[mb_type] . type;
Current_residu -> Cbp = i_mb_type_info[mb_type] . Cbp;
Current_residu -> Intra16x16PredMode = i_mb_type_info[mb_type] . pred_mode;
}
break;
}
//Initialize base macroblock address
GetBaseMbAddr(Nal, aio_pstBlock, iMb_x << 4, iMb_y << 4);
}
else{
aio_pstBlock -> MbPartPredMode [0] = Current_residu -> MbType = GetBaseType(Nal, BaseResidu, aio_pstBlock, iMb_x, iMb_y);
}
//Updating the slice table in order to save in which slice each macroblock belong to
Current_residu -> SliceNum = aio_tiSlice_table [iCurrMbAddr] = ai_pstSlice -> slice_num ;
if ( !BaseModeFlag && Current_residu -> MbType == INTRA_PCM ) {
while ( !bytes_aligned(*position) ) {
getNbits(ai_pcData, position, 1);//pcm_alignment_zero_bit =
}
ParseIPCM(ai_pcData, position, Current_residu, aio_tiNon_zero_count_cache);
}
else {
//Updating the parameter in order to decode the VLC
fill_caches_svc( ai_pstSlice, Current_residu, BaseResidu, 0, aio_tiNon_zero_count_cache, aio_tiSlice_table,
aio_pstBlock, intra4x4_pred_mode_cache, iMb_x, iMb_y, Pps -> constrained_intra_pred_flag, Nal -> TCoeffPrediction);
if (!BaseModeFlag){
//Recovery of the motion vectors for the sub_macroblock
if ( !IS_I(Current_residu -> MbType) && (aio_pstBlock -> NumMbPart == 4)) {
int mbPartIdx;
if(sub_mb_pred_svc(ai_pcData, position, ai_pstSlice, aio_pstBlock, Current_residu)){
return 1;
}
noSubMbPartSizeLessThan8x8 = 0;
if ( direct_8x8_inference_flag ){
noSubMbPartSizeLessThan8x8 = 1;
}
for ( mbPartIdx = 0; mbPartIdx < 4; mbPartIdx ++){
if ( sub_mb_type_name[ai_pstSlice -> slice_type][Current_residu -> SubMbType[mbPartIdx]] != B_direct){
if ( sub_num_part[ai_pstSlice -> slice_type][Current_residu -> SubMbType[mbPartIdx]] > 1 )
noSubMbPartSizeLessThan8x8 = 0;
}
}
}
else
{
noSubMbPartSizeLessThan8x8 = 1;
if ( Pps -> transform_8x8_mode_flag && Current_residu -> MbType == INTRA_4x4 && getNbits(ai_pcData, position, 1)){
Current_residu -> MbType = Current_residu -> Transform8x8 = aio_pstBlock -> Transform8x8 = aio_pstBlock -> MbPartPredMode[0] = INTRA_8x8;
}
//Recovery of the prediction mode and the motion vectors for the macroblock
if(mb_pred_svc(ai_pcData, position, ai_pstSlice, aio_pstBlock, Current_residu, intra4x4_pred_mode_cache)){
return 1;
}
}
}
//Decoding process of the VLC
if( ai_pstSlice -> AdaptiveResidualPredictionFlag && ai_pstSlice -> slice_type != EI && (BaseModeFlag || ( !IS_I( Current_residu -> MbType) && Current_residu -> InCropWindow ))){
Current_residu -> ResidualPredictionFlag = getNbits(ai_pcData, position, 1);
}else{
Current_residu -> ResidualPredictionFlag = ai_pstSlice -> DefaultResidualPredictionFlag;
}
if ( BaseModeFlag || aio_pstBlock -> MbPartPredMode[0] != INTRA_16x16 ){
Current_residu -> Cbp = read_me_svc(ai_pcData, position, aio_pstBlock -> MbPartPredMode[0],Current_residu, iCurrMbAddr, ai_pstSlice, iMb_x);
if ( (Current_residu -> Cbp & 15) && Pps -> transform_8x8_mode_flag && (BaseModeFlag || (!IS_I(Current_residu -> MbType) &&
noSubMbPartSizeLessThan8x8 && ( Current_residu -> MbType == B_direct || direct_8x8_inference_flag))) &&
getNbits(ai_pcData, position, 1)){
Current_residu -> Transform8x8 = aio_pstBlock -> Transform8x8 = INTRA_8x8;
}
}
if ( Current_residu -> Cbp > 0 || (Current_residu -> MbType == INTRA_16x16)) {
int mb_qp_delta = read_se(ai_pcData, position);
residual(ai_pcData, position, Current_residu, vlc, aio_tiNon_zero_count_cache);
//In case of cbp is equal to zéro, we check if there is a DC level
if (Current_residu -> Cbp == 0 && aio_tiNon_zero_count_cache[0] != 0){
Current_residu -> Cbp = 15;
}
if ( Current_residu -> MbType == INTRA_16x16 && !(Current_residu -> Cbp & 15) && (Current_residu -> Cbp & 0x30) && aio_tiNon_zero_count_cache[0]){
Current_residu -> Cbp += 15;
}
#ifdef TI_OPTIM
*last_QP = Current_residu -> Qp = divide(*last_QP + mb_qp_delta + 52, 52) >> 8 ;
#else
*last_QP = Current_residu -> Qp = (*last_QP + mb_qp_delta + 52) % 52;
#endif
}else {
/**
This function permits to recover the macroblock's data from the vlc
All the parameters decoded will be stored in differents structures or tables.
@param Pps PPS structure of the current video.
@param picture_residu Structure whixh contains information about the macroblock.
@param data The NAL unit.
@param aio_piPosition The current aio_piPosition in the NAL.
@param Slice The Slice structure.
@param block Contains all parameters of the current macroblock.
@param vlc The VLC tables in order to decode the Nal Unit.
@param non_zero_count_cache Specifies the coeff_token of each blocks 4x4 of a macroblock.
@param non_zero_count Specifies the coeff_token of each block of the picture.
@param SliceTable Specifies in which Slice belongs each macroblock of the picture.
@param intra_pred_mod Contains the prediction mode for each macroblock.
@param ai_iMb_x The x position of the macroblock in the picture.
@param ai_iMb_y The y position of the macroblock in the picture.
@param last_QP Give the QP of the last decoded macroblock.
@param iCurrMbAddr Number of the current macroblock.
*/
char macroblock_I_partitionning(const PPS *Pps, RESIDU *picture_residu, const unsigned char *ai_pcData, int *aio_piPosition,
SLICE *Slice, DATA *aio_pstBlock, const VLC_TABLES * Vlc,
unsigned char *NonZeroCountCache, unsigned char *SliceTable,
const short ai_iMb_x, const short ai_iMb_y, unsigned char *last_QP, int iCurrMbAddr)
{
short intra4x4_pred_mode_cache[40];
#ifdef ERROR_DETECTION
//Error detection
if(ErrorsCheckIMbType(picture_residu -> MbType)){
return 1;
}
#endif
//Updating the Slice table in order to save in which slice each macroblock belong to
picture_residu -> SliceNum = SliceTable [iCurrMbAddr] = Slice -> slice_num ;
if ( picture_residu -> MbType == INTRA_PCM ) {
while ( !bytes_aligned(*aio_piPosition) ) {
getNbits(ai_pcData, aio_piPosition, 1);//pcm_alignment_zero_bit =
}
ParseIPCM(ai_pcData, aio_piPosition, picture_residu, NonZeroCountCache);
}
else {
//Updating the parameter in order to decode the VLC
fill_caches_I( Slice, picture_residu, 0, NonZeroCountCache, aio_pstBlock, SliceTable,
intra4x4_pred_mode_cache, ai_iMb_x, ai_iMb_y, Pps -> constrained_intra_pred_flag);
if ( Pps -> transform_8x8_mode_flag && picture_residu -> MbType == INTRA_4x4 && getNbits(ai_pcData, aio_piPosition, 1)){
picture_residu -> Transform8x8 = picture_residu -> MbType = aio_pstBlock -> Transform8x8 = INTRA_8x8;
}
//Recovery of the prediction mode and the motion vectors for the macroblock
if(mb_pred_I(ai_pcData, aio_piPosition, picture_residu, picture_residu -> Intra16x16DCLevel, intra4x4_pred_mode_cache)){
return 1;
}
if ( aio_pstBlock -> MbPartPredMode[0] != INTRA_16x16 ) {
picture_residu -> Cbp = read_me(ai_pcData, aio_piPosition, aio_pstBlock -> MbPartPredMode[0]);
}
if ( picture_residu -> Cbp > 0 || (picture_residu -> MbType == INTRA_16x16)){
int mb_qp_delta = read_se(ai_pcData, aio_piPosition);
#ifdef TI_OPTIM
*last_QP = picture_residu -> Qp = divide(*last_QP + mb_qp_delta + 52, 52) >> 8 ;
#else
*last_QP = picture_residu -> Qp = (*last_QP + mb_qp_delta + 52) % 52;
#endif
//Decoding process of the VLC
residual(ai_pcData, aio_piPosition, picture_residu, Vlc, NonZeroCountCache);
}
else
{
void pvmp3_get_scale_factors(mp3ScaleFactors *scalefac,
mp3SideInfo *si,
int32 gr,
int32 ch,
tmp3Bits *pMainData)
{
int32 sfb;
int32 i;
int32 window;
granuleInfo *gr_info = &(si->ch[ch].gran[gr]);
if (gr_info->window_switching_flag && (gr_info->block_type == 2))
{
if (gr_info->mixed_block_flag)
{ /* MIXED */
for (sfb = 0; sfb < 8; sfb++)
{
scalefac->l[sfb] = getNbits(pMainData, slen[0][gr_info->scalefac_compress]);
}
for (sfb = 3; sfb < 6; sfb++)
{
for (window = 0; window < 3; window++)
{
scalefac->s[window][sfb] = getNbits(pMainData, slen[0][gr_info->scalefac_compress]);
}
}
for (sfb = 6; sfb < 12; sfb++)
{
for (window = 0; window < 3; window++)
{
scalefac->s[window][sfb] = getNbits(pMainData, slen[1][gr_info->scalefac_compress]);
}
}
}
else
{ /* SHORT*/
for (i = 0; i < 2; i++)
{
for (sfb = sfbtable.s[i]; sfb < sfbtable.s[i+1]; sfb++)
{
for (window = 0; window < 3; window++)
{
scalefac->s[window][sfb] = getNbits(pMainData, slen[i][gr_info->scalefac_compress]);
}
}
}
}
scalefac->s[0][12] = 0; /* sfb = 12 win= 0 */
scalefac->s[1][12] = 0; /* sfb = 12 win= 1 */
scalefac->s[2][12] = 0; /* sfb = 12 win= 2 */
}
else
{ /* LONG types 0,1,3 */
int32 *ptr = &scalefac->l[0];
for (i = 0; i < 4; i++)
{
int32 tmp4 = long_sfbtable[i];
if ((si->ch[ch].scfsi[i] == 0) || (gr == 0))
{
int32 tmp1 = slen[(i>>1)][gr_info->scalefac_compress];
if (tmp1)
{
int32 tmp2 = tmp1 * tmp4;
uint32 tmp3 = getNbits(pMainData, tmp2);
tmp4 = 32 - tmp1;
for (; tmp2 > 0; tmp2 -= tmp1)
{
*(ptr++) = (tmp3 << (32 - tmp2)) >> tmp4;
}
}
else
{
for (sfb = tmp4; sfb != 0; sfb--)
{
*(ptr++) = 0;
}
}
}
else
{
/**
This function permits to decode the image reference of each sub-macroblock.
@param data The NAL unit.
@param position The current position in the NAL.
@param block Contains all parameters of the current macroblock.
@param slice The slice structure.
*/
int sub_mb_pred_svc ( const unsigned char *ai_pcData, int *position, const SLICE *ai_pstSlice,
DATA *aio_pstMacroblock, RESIDU *Current_residu)
{
int mbPartIdx ;
int subMbPartIdx ;
//Recovery of the sub-macroblock type
GetCavlcSubMbType(ai_pcData, position, Current_residu);
#ifdef ERROR_DETECTION
//Error detection
if(ErrorsCheckSubMbType( Current_residu -> SubMbType, ai_pstSlice -> slice_type? MaxBSubMbType:MaxPSubMbType)){
return 1;
}
#endif
//Recovery of the image reference of each sub-macroblock
if( ai_pstSlice -> AdaptiveMotionPredictionFlag && Current_residu -> InCropWindow ) {
for ( mbPartIdx = 0 ; mbPartIdx < 4 ; mbPartIdx++ ) {
if (sub_mb_type_name[ai_pstSlice -> slice_type][Current_residu -> SubMbType [mbPartIdx]] != Pred_L1 &&
sub_mb_type_name[ai_pstSlice -> slice_type][Current_residu -> SubMbType [mbPartIdx]] != B_direct) {
aio_pstMacroblock -> MotionPredL0 [mbPartIdx] = getNbits(ai_pcData, position, 1);
}
}
//Recovery of the image reference of each sub-macroblock
for ( mbPartIdx = 0 ; mbPartIdx < 4 ; mbPartIdx++ ) {
if ( sub_mb_type_name[ai_pstSlice -> slice_type][Current_residu -> SubMbType [mbPartIdx]] != Pred_L0 &&
sub_mb_type_name[ai_pstSlice -> slice_type][Current_residu -> SubMbType [mbPartIdx]] != B_direct) {
aio_pstMacroblock -> MotionPredL1 [mbPartIdx] = getNbits(ai_pcData, position, 1);
}
}
}else{
aio_pstMacroblock -> MotionPredL0[0] = aio_pstMacroblock -> MotionPredL0[1] =
aio_pstMacroblock -> MotionPredL0[2] = aio_pstMacroblock -> MotionPredL0[3] =
aio_pstMacroblock -> MotionPredL1[0] = aio_pstMacroblock -> MotionPredL1[1] =
aio_pstMacroblock -> MotionPredL1[2] = aio_pstMacroblock -> MotionPredL1[3] = ai_pstSlice -> DefaultMotionPredictionFlag;
}
if (ai_pstSlice -> num_RefIdxL0_active_minus1 != 0){
for ( mbPartIdx = 0 ; mbPartIdx < 4 ; mbPartIdx++ ) {
if ((Current_residu -> MbType != P_8x8ref0) && (!aio_pstMacroblock -> MotionPredL0[mbPartIdx]) &&
(sub_mb_type_name[ai_pstSlice -> slice_type][Current_residu -> SubMbType [mbPartIdx]] != B_direct) &&
(sub_mb_type_name[ai_pstSlice -> slice_type][Current_residu -> SubMbType [mbPartIdx]] != Pred_L1)) {
aio_pstMacroblock -> RefIdxL0 [mbPartIdx] = read_te(ai_pcData, position, ai_pstSlice -> num_RefIdxL0_active_minus1);
}
}
}
#ifdef ERROR_DETECTION
//Error Detection
if(ErrorsCheckSubRefLx(aio_pstMacroblock -> RefIdxL0, ai_pstSlice -> num_RefIdxL0_active_minus1)){
return 1;
}
#endif
//Recovery of the image reference of each sub-macroblock
if (ai_pstSlice -> num_RefIdxL1_active_minus1 != 0){
for ( mbPartIdx = 0 ; mbPartIdx < 4 ; mbPartIdx++ ) {
if ((sub_mb_type_name[ai_pstSlice -> slice_type][Current_residu -> SubMbType [mbPartIdx]] != B_direct) &&
(sub_mb_type_name[ai_pstSlice -> slice_type][Current_residu -> SubMbType [mbPartIdx]] != Pred_L0) &&
(!aio_pstMacroblock -> MotionPredL1[mbPartIdx])) {
aio_pstMacroblock -> RefIdxL1 [mbPartIdx] = read_te(ai_pcData, position, ai_pstSlice -> num_RefIdxL1_active_minus1);
}
}
}
#ifdef ERROR_DETECTION
//Error Detection
if(ErrorsCheckSubRefLx(aio_pstMacroblock -> RefIdxL1, ai_pstSlice -> num_RefIdxL1_active_minus1)){
return 1;
}
#endif
//Recovery of the motion vector of each sub-macroblock
for ( mbPartIdx = 0 ; mbPartIdx < 4 ; mbPartIdx++ ) {
if ( sub_mb_type_name[ai_pstSlice -> slice_type][Current_residu -> SubMbType [mbPartIdx]] != B_direct
&& sub_mb_type_name[ai_pstSlice -> slice_type][Current_residu -> SubMbType [mbPartIdx]] != Pred_L1 )
{
for ( subMbPartIdx = 0 ; subMbPartIdx < sub_num_part[ ai_pstSlice -> slice_type][ Current_residu -> SubMbType [mbPartIdx]] ; subMbPartIdx++ ) {
int index = ( mbPartIdx << 2) + subMbPartIdx;
aio_pstMacroblock -> MvdL0 [index][0] = read_se(ai_pcData, position);
aio_pstMacroblock -> MvdL0 [index][1] = read_se(ai_pcData, position);
}
}
}
//Recovery of the motion vector of each sub-macroblock
for ( mbPartIdx = 0 ; mbPartIdx < 4 ; mbPartIdx++ ) {
if ( sub_mb_type_name[ai_pstSlice -> slice_type][Current_residu -> SubMbType [mbPartIdx]] != B_direct
&& sub_mb_type_name[ai_pstSlice -> slice_type][Current_residu -> SubMbType [mbPartIdx]] != Pred_L0 )
{
for ( subMbPartIdx = 0 ; subMbPartIdx < sub_num_part[ ai_pstSlice -> slice_type][ Current_residu -> SubMbType [mbPartIdx]] ; subMbPartIdx++ )
{
int index = ( mbPartIdx << 2) + subMbPartIdx;
aio_pstMacroblock -> MvdL1 [index][0] = read_se(ai_pcData, position);
aio_pstMacroblock -> MvdL1 [index][1] = read_se(ai_pcData, position);
}
}
}
return 0;
}
//============================================================================================
//函数功能:量化因子(scale factor)的解码工作,目的是在解出反量化模组(requantization)需要的量化因子,
// 而每个frame中都是有两个granule组成,每个granule中含有左右两个声道,而每个声道内均存放有
// 经过编码的量化因子与经过Huffman编码后的压缩资料
// 因为量化因子在编码时依照余弦转换(MDCT)运算时所采用的不同的窗口框函数划分成数个量化
// 区(scale factor band),长窗划分成21个量化区;而短窗则划分成12个量化区,而每个量化区的
// 量化因子可能采用不同的位元数来编码的,所以必须先从旁资讯中解出不同量化区中的量化因子
// 的编码位元数,再根据所使用的窗框解出所有的量化因子
//函数参数:"si"表示旁信息,"gr"表示granule,"ch"表示声道,"pMainData"表示
//============================================================================================
void pvmp3_get_scale_factors(mp3ScaleFactors *scalefac,
mp3SideInfo *si,
int32 gr,
int32 ch,
tmp3Bits *pMainData)
{
//定义变量
int32 sfb;
int32 i;
int32 window;
granuleInfo *gr_info = &(si->ch[ch].gran[gr]);
//若"window_switching_flag"为1并且"block_type"为2
if (gr_info->window_switching_flag && (gr_info->block_type == 2))
{
//如果"mixed_block_flag"为1,即为混合型
if (gr_info->mixed_block_flag)
{
//得到"l[sfb]"的所有量化因子,其中sfb属于0-7,"l[]"表示长窗框
for (sfb = 0; sfb < 8; sfb++)
{
scalefac->l[sfb] = getNbits(pMainData, slen[0][gr_info->scalefac_compress]);
}
//得到"s[window][sfb]"的所有量化因子,其中window属于0-2,sfb属于3-5,"s[][]"表示短窗框
for (sfb = 3; sfb < 6; sfb++)
{
for (window = 0; window < 3; window++)
{
scalefac->s[window][sfb] = getNbits(pMainData, slen[0][gr_info->scalefac_compress]);
}
}
//得到"s[window][sfb]"的所有量化因子,其中window属于0-2,sfb属于6-11,"s[][]"表示短窗框
for (sfb = 6; sfb < 12; sfb++)
{
for (window = 0; window < 3; window++)
{
scalefac->s[window][sfb] = getNbits(pMainData, slen[1][gr_info->scalefac_compress]);
}
}
}
//如果"mixed_block_flag"不为1,即为短窗框
else
{
//获得"s[window][region]"的所有量化因子,其中"window"属于0-2,"region"属于0-11
//对"sfbtabe"中"s[]"数组的前两个元素,即"s[0]"和"s[1]"
for (i = 0; i < 2; i++)
{
//对每个位于"s[i]","s[i+1]"区间内的元素
for (sfb = sfbtable.s[i]; sfb < sfbtable.s[i+1]; sfb++)
{
//对每个"window",其中"window"属于0-2
for (window = 0; window < 3; window++)
{
scalefac->s[window][sfb] = getNbits(pMainData, slen[i][gr_info->scalefac_compress]);
}
}
}
}
//分别对每个短窗框的第12个量化区赋值为0
scalefac->s[0][12] = 0; /* sfb = 12 win= 0 */
scalefac->s[1][12] = 0; /* sfb = 12 win= 1 */
scalefac->s[2][12] = 0; /* sfb = 12 win= 2 */
//若"window_switching_flag"为1并且"block_type"为2的if语句结束
}
//若不满足"window_switching_flag"为1并且"block_type",即为长窗口,LONG types为0,1,3
else
{
int32 *ptr = &scalefac->l[0];
//针对每个"long_sfbtable"元素
for (i = 0; i < 4; i++)
{
int32 tmp4 = long_sfbtable[i];
//若"side iformation"的"scfi band"为0或者"granule"为0
if ((si->ch[ch].scfsi[i] == 0) || (gr == 0))
{
int32 tmp1 = slen[(i>>1)][gr_info->scalefac_compress];
//若tmp1大于0
if (tmp1)
{
int32 tmp2 = tmp1 * tmp4;
uint32 tmp3 = getNbits(pMainData, tmp2);
tmp4 = 32 - tmp1;
//为每个相应的长框量化区"l[]"赋值
for (; tmp2 > 0; tmp2 -= tmp1)
{
*(ptr++) = (tmp3 << (32 - tmp2)) >> tmp4;
}
}
//若tmp1为0
else
{
//为每个相应的长框量化区"l[]"赋值为0
for (sfb = tmp4; sfb != 0; sfb--)
{
*(ptr++) = 0;
}
}
}
//若不满足("side iformation"的"scfi band"为0或者"granule"为0),则为相应的"l[]"赋值
else
{
/**
This function permits to get from the NAL unit additional parameters.
VUI parameters are not required for constructing the luma and chroma samples by teh decoding process.
@param data The NAL unit.
@param position The current position in the NAL.
*/
void vui_parameters ( unsigned char *data, int *position, SPS *sps )
{
int overscan_info_present_flag ;
int video_signal_type_present_flag ;
int bitstream_restriction_flag ;
int aspect_ratio_info_present_flag = getNbits(data, position, 1);
if ( aspect_ratio_info_present_flag ) {
int aspect_ratio_idc = getNbits(data, position, 8);
if ( aspect_ratio_idc == Extended_SAR ) {
getNbits(data, position, 16);//sar_width =
getNbits(data, position, 16);// sar_height =
}
}
//scanner dans ffmpeg mais pas pris en compte
overscan_info_present_flag = getNbits(data, position, 1);
if ( overscan_info_present_flag )
getNbits(data, position, 1);// overscan_appropriate_flag =
video_signal_type_present_flag = getNbits(data, position, 1);
if ( video_signal_type_present_flag ) {
getNbits(data, position, 3);//video_format =
getNbits(data, position, 1);// video_full_range_flag =
if (getNbits(data, position, 1)) {
getNbits(data, position, 8);// colour_primaries =
getNbits(data, position, 8);// transfer_characteristics =
getNbits(data, position, 8);// matrix_coefficients =
}
}
if (getNbits(data, position, 1)) {
read_ue(data, position);//chroma_sample_loc_type_top_field =
read_ue(data, position);// chroma_sample_loc_type_bottom_field =
}
//******************************************
if (getNbits(data, position, 1)) {
get32bits(data, position);// num_units_in_tick =
get32bits(data, position);//time_scale =
getNbits(data, position, 1);// fixed_frame_rate_flag =
}
sps -> nal_hrd_parameters_present_flag = getNbits(data, position, 1);
if ( sps -> nal_hrd_parameters_present_flag )
hrd_parameters(data, position,sps);
sps -> vlc_hrd_parameters_present_flag = getNbits(data, position, 1);
if ( sps -> vlc_hrd_parameters_present_flag )
hrd_parameters(data, position,sps);
//scanner dans ffmpeg mais pas pris en compte
if ( sps -> nal_hrd_parameters_present_flag || sps -> vlc_hrd_parameters_present_flag )
getNbits(data, position, 1);//low_delay_hrd_flag =
//********************************************
sps -> pic_present_flag = getNbits(data, position, 1);// =
bitstream_restriction_flag = getNbits(data, position, 1);
if ( bitstream_restriction_flag ) {
//scanner dans ffmpeg mais pas pris en compte
getNbits(data, position, 1);// motion_vectors_over_pic_boundaries_flag =
read_ue(data, position);//max_bytes_per_pic_denom =
read_ue(data, position);//max_bits_per_mb_denom =
read_ue(data, position);//log2_max_mv_length_horizontal =
read_ue(data, position);//log2_max_mv_length_vertical =
//******************************************
read_ue(data, position);//num_reorder_frames =
read_ue(data, position);//max_dec_frame_buffering =
}
}