H264引數語法文件: SPS、PPS、IDR
From: http://blog.csdn.net/heanyu/article/details/6205390
H.264碼流第一個 NALU 是 SPS(序列引數集Sequence Parameter Set)
對應H264標準文件 7.3.2.1 序列引數集的語法進行解析
SPS引數解析// fill sps with content of p
- int InterpretSPS (VideoParameters *p_Vid, DataPartition *p, seq_parameter_set_rbsp_t *sps)
- {
- unsigned i;
- unsigned n_ScalingList;
- int reserved_zero;
- Bitstream *s = p->bitstream;
- assert (p != NULL);
- assert (p->bitstream != NULL);
- assert (p->bitstream->streamBuffer != 0);
- assert (sps != NULL);
- p_Dec->UsedBits = 0;
- sps->profile_idc = u_v (8, "SPS: profile_idc" , s);
- if ((sps->profile_idc!=BASELINE ) &&
- (sps->profile_idc!=MAIN ) &&
- (sps->profile_idc!=EXTENDED ) &&
- (sps->profile_idc!=FREXT_HP ) &&
- (sps->profile_idc!=FREXT_Hi10P ) &&
- (sps->profile_idc!=FREXT_Hi422 ) &&
- (sps->profile_idc!=FREXT_Hi444 ) &&
- (sps->profile_idc!=FREXT_CAVLC444 )
- #if (MVC_EXTENSION_ENABLE)
- && (sps->profile_idc!=MVC_HIGH)
- && (sps->profile_idc!=STEREO_HIGH)
- #endif
- )
- {
- printf("Invalid Profile IDC (%d) encountered. /n", sps->profile_idc);
- return p_Dec->UsedBits;
- }
- sps->constrained_set0_flag = u_1 ( "SPS: constrained_set0_flag" , s);
- sps->constrained_set1_flag = u_1 ( "SPS: constrained_set1_flag" , s);
- sps->constrained_set2_flag = u_1 ( "SPS: constrained_set2_flag" , s);
- sps->constrained_set3_flag = u_1 ( "SPS: constrained_set3_flag" , s);
- #if (MVC_EXTENSION_ENABLE)
- sps->constrained_set4_flag = u_1 ( "SPS: constrained_set4_flag" , s);
- reserved_zero = u_v (3, "SPS: reserved_zero_3bits" , s);
- #else
- reserved_zero = u_v (4, "SPS: reserved_zero_4bits" , s);
- #endif
- assert (reserved_zero==0);
- sps->level_idc = u_v (8, "SPS: level_idc" , s);
- sps->seq_parameter_set_id = ue_v ("SPS: seq_parameter_set_id" , s);
- // Fidelity Range Extensions stuff
- sps->chroma_format_idc = 1;
- sps->bit_depth_luma_minus8 = 0;
- sps->bit_depth_chroma_minus8 = 0;
- p_Vid->lossless_qpprime_flag = 0;
- sps->separate_colour_plane_flag = 0;
- if((sps->profile_idc==FREXT_HP ) ||
- (sps->profile_idc==FREXT_Hi10P) ||
- (sps->profile_idc==FREXT_Hi422) ||
- (sps->profile_idc==FREXT_Hi444) ||
- (sps->profile_idc==FREXT_CAVLC444)
- #if (MVC_EXTENSION_ENABLE)
- || (sps->profile_idc==MVC_HIGH)
- || (sps->profile_idc==STEREO_HIGH)
- #endif
- )
- {
- sps->chroma_format_idc = ue_v ("SPS: chroma_format_idc" , s);
- if(sps->chroma_format_idc == YUV444)
- {
- sps->separate_colour_plane_flag = u_1 ("SPS: separate_colour_plane_flag" , s);
- }
- sps->bit_depth_luma_minus8 = ue_v ("SPS: bit_depth_luma_minus8" , s);
- sps->bit_depth_chroma_minus8 = ue_v ("SPS: bit_depth_chroma_minus8" , s);
- //checking;
- if((sps->bit_depth_luma_minus8+8 > sizeof(imgpel)*8) || (sps->bit_depth_chroma_minus8+8> sizeof(imgpel)*8))
- error ("Source picture has higher bit depth than imgpel data type. /nPlease recompile with larger data type for imgpel.", 500);
- p_Vid->lossless_qpprime_flag = u_1 ("SPS: lossless_qpprime_y_zero_flag" , s);
- sps->seq_scaling_matrix_present_flag = u_1 ( "SPS: seq_scaling_matrix_present_flag" , s);
- if(sps->seq_scaling_matrix_present_flag)
- {
- n_ScalingList = (sps->chroma_format_idc != YUV444) ? 8 : 12;
- for(i=0; iseq_scaling_list_present_flag[i] = u_1 ( "SPS: seq_scaling_list_present_flag" , s);
- if(sps->seq_scaling_list_present_flag[i])
- {
- if(i<6) scaling_list="">ScalingList4x4[i], 16, &sps->UseDefaultScalingMatrix4x4Flag[i], s);
- else
- Scaling_List(sps->ScalingList8x8[i-6], 64, &sps->UseDefaultScalingMatrix8x8Flag[i-6], s);
- }
- }
- }
- }
- sps->log2_max_frame_num_minus4 = ue_v ("SPS: log2_max_frame_num_minus4" , s);
- sps->pic_order_cnt_type = ue_v ("SPS: pic_order_cnt_type" , s);
- if (sps->pic_order_cnt_type == 0)
- sps->log2_max_pic_order_cnt_lsb_minus4 = ue_v ("SPS: log2_max_pic_order_cnt_lsb_minus4" , s);
- else if (sps->pic_order_cnt_type == 1)
- {
- sps->delta_pic_order_always_zero_flag = u_1 ("SPS: delta_pic_order_always_zero_flag" , s);
- sps->offset_for_non_ref_pic = se_v ("SPS: offset_for_non_ref_pic" , s);
- sps->offset_for_top_to_bottom_field = se_v ("SPS: offset_for_top_to_bottom_field" , s);
- sps->num_ref_frames_in_pic_order_cnt_cycle = ue_v ("SPS: num_ref_frames_in_pic_order_cnt_cycle" , s);
- for(i=0; inum_ref_frames_in_pic_order_cnt_cycle; i++)
- sps->offset_for_ref_frame[i] = se_v ("SPS: offset_for_ref_frame[i]" , s);
- }
- sps->num_ref_frames = ue_v ("SPS: num_ref_frames" , s);
- sps->gaps_in_frame_num_value_allowed_flag = u_1 ("SPS: gaps_in_frame_num_value_allowed_flag" , s);
- sps->pic_width_in_mbs_minus1 = ue_v ("SPS: pic_width_in_mbs_minus1" , s);
- sps->pic_height_in_map_units_minus1 = ue_v ("SPS: pic_height_in_map_units_minus1" , s);
- sps->frame_mbs_only_flag = u_1 ("SPS: frame_mbs_only_flag" , s);
- if (!sps->frame_mbs_only_flag)
- {
- sps->mb_adaptive_frame_field_flag = u_1 ("SPS: mb_adaptive_frame_field_flag" , s);
- }
- sps->direct_8x8_inference_flag = u_1 ("SPS: direct_8x8_inference_flag" , s);
- sps->frame_cropping_flag = u_1 ("SPS: frame_cropping_flag" , s);
- if (sps->frame_cropping_flag)
- {
- sps->frame_cropping_rect_left_offset = ue_v ("SPS: frame_cropping_rect_left_offset" , s);
- sps->frame_cropping_rect_right_offset = ue_v ("SPS: frame_cropping_rect_right_offset" , s);
- sps->frame_cropping_rect_top_offset = ue_v ("SPS: frame_cropping_rect_top_offset" , s);
- sps->frame_cropping_rect_bottom_offset = ue_v ("SPS: frame_cropping_rect_bottom_offset" , s);
- }
- sps->vui_parameters_present_flag = (Boolean) u_1 ("SPS: vui_parameters_present_flag" , s);
- InitVUI(sps);
- ReadVUI(p, sps);
- sps->Valid = TRUE;
- return p_Dec->UsedBits;
- }
對應H264標準文件 7.3.2.2 序列引數集的語法進行解析
PPS引數解析
- int InterpretPPS (VideoParameters *p_Vid, DataPartition *p, pic_parameter_set_rbsp_t *pps)
- {
- unsigned i;
- unsigned n_ScalingList;
- int chroma_format_idc;
- int NumberBitsPerSliceGroupId;
- Bitstream *s = p->bitstream;
- assert (p != NULL);
- assert (p->bitstream != NULL);
- assert (p->bitstream->streamBuffer != 0);
- assert (pps != NULL);
- p_Dec->UsedBits = 0;
- pps->pic_parameter_set_id = ue_v ("PPS: pic_parameter_set_id" , s);
- pps->seq_parameter_set_id = ue_v ("PPS: seq_parameter_set_id" , s);
- pps->entropy_coding_mode_flag = u_1 ("PPS: entropy_coding_mode_flag" , s);
- //! Note: as per JVT-F078 the following bit is unconditional. If F078 is not accepted, then
- //! one has to fetch the correct SPS to check whether the bit is present (hopefully there is
- //! no consistency problem :-(
- //! The current encoder code handles this in the same way. When you change this, don't forget
- //! the encoder! StW, 12/8/02
- pps->bottom_field_pic_order_in_frame_present_flag = u_1 ("PPS: bottom_field_pic_order_in_frame_present_flag" , s);
- pps->num_slice_groups_minus1 = ue_v ("PPS: num_slice_groups_minus1" , s);
- // FMO stuff begins here
- if (pps->num_slice_groups_minus1 > 0)
- {
- pps->slice_group_map_type = ue_v ("PPS: slice_group_map_type" , s);
- if (pps->slice_group_map_type == 0)
- {
- for (i=0; i<=pps->num_slice_groups_minus1; i++)
- pps->run_length_minus1 [i] = ue_v ("PPS: run_length_minus1 [i]" , s);
- }
- else if (pps->slice_group_map_type == 2)
- {
- for (i=0; inum_slice_groups_minus1; i++)
- {
- //! JVT-F078: avoid reference of SPS by using ue(v) instead of u(v)
- pps->top_left [i] = ue_v ("PPS: top_left [i]" , s);
- pps->bottom_right [i] = ue_v ("PPS: bottom_right [i]" , s);
- }
- }
- else if (pps->slice_group_map_type == 3 ||
- pps->slice_group_map_type == 4 ||
- pps->slice_group_map_type == 5)
- {
- pps->slice_group_change_direction_flag = u_1 ("PPS: slice_group_change_direction_flag" , s);
- pps->slice_group_change_rate_minus1 = ue_v ("PPS: slice_group_change_rate_minus1" , s);
- }
- else if (pps->slice_group_map_type == 6)
- {
- if (pps->num_slice_groups_minus1+1 >4)
- NumberBitsPerSliceGroupId = 3;
- else if (pps->num_slice_groups_minus1+1 > 2)
- NumberBitsPerSliceGroupId = 2;
- else
- NumberBitsPerSliceGroupId = 1;
- pps->pic_size_in_map_units_minus1 = ue_v ("PPS: pic_size_in_map_units_minus1" , s);
- if ((pps->slice_group_id = calloc (pps->pic_size_in_map_units_minus1+1, 1)) == NULL)
- no_mem_exit ("InterpretPPS: slice_group_id");
- for (i=0; i<=pps->pic_size_in_map_units_minus1; i++)
- pps->slice_group_id[i] = (byte) u_v (NumberBitsPerSliceGroupId, "slice_group_id[i]", s);
- }
- }
- // End of FMO stuff
- pps->num_ref_idx_l0_active_minus1 = ue_v ("PPS: num_ref_idx_l0_active_minus1" , s);
- pps->num_ref_idx_l1_active_minus1 = ue_v ("PPS: num_ref_idx_l1_active_minus1" , s);
- pps->weighted_pred_flag = u_1 ("PPS: weighted_pred_flag" , s);
- pps->weighted_bipred_idc = u_v ( 2, "PPS: weighted_bipred_idc" , s);
- pps->pic_init_qp_minus26 = se_v ("PPS: pic_init_qp_minus26" , s);
- pps->pic_init_qs_minus26 = se_v ("PPS: pic_init_qs_minus26" , s);
- pps->chroma_qp_index_offset = se_v ("PPS: chroma_qp_index_offset" , s);
- pps->deblocking_filter_control_present_flag = u_1 ("PPS: deblocking_filter_control_present_flag" , s);
- pps->constrained_intra_pred_flag = u_1 ("PPS: constrained_intra_pred_flag" , s);
- pps->redundant_pic_cnt_present_flag = u_1 ("PPS: redundant_pic_cnt_present_flag" , s);
- if(more_rbsp_data(s->streamBuffer, s->frame_bitoffset,s->bitstream_length)) // more_data_in_rbsp()
- {
- //Fidelity Range Extensions Stuff
- pps->transform_8x8_mode_flag = u_1 ("PPS: transform_8x8_mode_flag" , s);
- pps->pic_scaling_matrix_present_flag = u_1 ("PPS: pic_scaling_matrix_present_flag" , s);
- if(pps->pic_scaling_matrix_present_flag)
- {
- chroma_format_idc = p_Vid->SeqParSet[pps->seq_parameter_set_id].chroma_format_idc;
- n_ScalingList = 6 + ((chroma_format_idc != YUV444) ? 2 : 6) * pps->transform_8x8_mode_flag;
- for(i=0; ipic_scaling_list_present_flag[i]= u_1 ("PPS: pic_scaling_list_present_flag" , s);
- if(pps->pic_scaling_list_present_flag[i])
- {
- if(i<6) scaling_list="">ScalingList4x4[i], 16, &pps->UseDefaultScalingMatrix4x4Flag[i], s);
- else
- Scaling_List(pps->ScalingList8x8[i-6], 64, &pps->UseDefaultScalingMatrix8x8Flag[i-6], s);
- }
- }
- }
- pps->second_chroma_qp_index_offset = se_v ("PPS: second_chroma_qp_index_offset" , s);
- }
- else
- {
- pps->second_chroma_qp_index_offset = pps->chroma_qp_index_offset;
- }
- pps->Valid = TRUE;
- return p_Dec->UsedBits;
- }
對應H264標準文件 7.3.3 序列引數集的語法進行解析
IDR引數解析
- case NALU_TYPE_IDR:
- img->idr_flag = (nalu->nal_unit_type == NALU_TYPE_IDR);
- img->nal_reference_idc = nalu->nal_reference_idc;
- img->disposable_flag = (nalu->nal_reference_idc == NALU_PRIORITY_DISPOSABLE);
- currSlice->dp_mode = PAR_DP_1; //++ dp_mode:資料分割模式;PAR_DP_1=0:沒有資料分割
- currSlice->max_part_nr = 1;
- currSlice->ei_flag = 0; //++ 該處賦值直接影響decode_slice()函式中對decode_one_slice()函式的呼叫
- //++ 該值不為0,表明當前片出錯,解碼程式將忽略當前片的解碼過程,而使用錯誤隱藏
- currStream = currSlice->partArr[0].bitstream;
- currStream->ei_flag = 0; //++ 此處的賦值為最終賦值,以後不再改變。該值將對每個巨集塊的ei_flag產生影響
- //++ 參見macroblock.c檔案read_one_macroblock()函式的如下語句:
- //++ :if(!dP->bitstream->ei_flag) :currMB->ei_flag = 0;
- //++ 該值還在macroblock.c檔案if(IS_INTRA (currMB) && dP->bitstream->ei_flag && img->number)中用到
- currStream->frame_bitoffset = currStream->read_len = 0;
- memcpy (currStream->streamBuffer, &nalu->buf[1], nalu->len-1);
- currStream->code_len = currStream->bitstream_length = RBSPtoSODB(currStream->streamBuffer, nalu->len-1);
- // Some syntax of the Slice Header depends on the parameter set, which depends on
- // the parameter set ID of the SLice header. Hence, read the pic_parameter_set_id
- // of the slice header first, then setup the active parameter sets, and then read
- // the rest of the slice header
- BitsUsedByHeader = FirstPartOfSliceHeader(); //++ 參見標準7.3.3
- UseParameterSet (currSlice->pic_parameter_set_id);
- BitsUsedByHeader+= RestOfSliceHeader (); //++ 參見標準7.3.3
- //++ BitsUsedByHeader在程式中沒有實際用處,而且BitsUsedByHeader+= RestOfSliceHeader ()
- //++ 重複計算了FirstPartOfSliceHeader()所用到的位元數。因為在FirstPartOfSliceHeader()
- //++ 之後,變數UsedBits值並未被置零就代入RestOfSliceHeader()運算,從而RestOfSliceHeader ()
- //++ 在返回時,BitsUsedByHeader+= RestOfSliceHeader()多加了一個BitsUsedByHeader值
- FmoInit (active_pps, active_sps);
- if(is_new_picture())
- {
- init_picture(img, input);
- current_header = SOP;
- //check zero_byte if it is also the first NAL unit in the access unit
- CheckZeroByteVCL(nalu, &ret);
- }
- else
- current_header = SOS;
- init_lists(img->type, img->currentSlice->structure);
- reorder_lists (img->type, img->currentSlice);
- if (img->structure==FRAME)
- {
- init_mbaff_lists();
- }
- /* if (img->frame_num==1) // write a reference list
- {
- count ++;
- if (count==1)
- for (i=0; i
- // From here on, active_sps, active_pps and the slice header are valid
- if (img->MbaffFrameFlag)
- img->current_mb_nr = currSlice->start_mb_nr << 1="" style="color: #0000ff">else
- img->current_mb_nr = currSlice->start_mb_nr;
- if (active_pps->entropy_coding_mode_flag)
- {
- int ByteStartPosition = currStream->frame_bitoffset/8;
- if (currStream->frame_bitoffset%8 != 0)
- {
- ByteStartPosition++;
- }
- arideco_start_decoding (&currSlice->partArr[0].de_cabac, currStream->streamBuffer, ByteStartPosition, &currStream->read_len, img->type);
- }
- // printf ("read_new_slice: returning %s/n", current_header == SOP?"SOP":"SOS");
- FreeNALU(nalu);
- return current_header;
- break;
- case NALU_TYPE_DPA:
- //! The state machine here should follow the same ideas as the old readSliceRTP()
- //! basically:
- //! work on DPA (as above)
- //! read and process all following SEI/SPS/PPS/PD/Filler NALUs
- //! if next video NALU is dpB,
- //! then read and check whether it belongs to DPA, if yes, use it
- //! else
- //! ; // nothing
- //! read and process all following SEI/SPS/PPS/PD/Filler NALUs
- //! if next video NALU is dpC
- //! then read and check whether it belongs to DPA (and DPB, if present), if yes, use it, done
- //! else
- //! use the DPA (and the DPB if present)
- /*
- LC: inserting the code related to DP processing, mainly copying some of the parts
- related to NALU_TYPE_SLICE, NALU_TYPE_IDR.
- */
- if(expected_slice_type != NALU_TYPE_DPA)
- {
- /* oops... we found the next slice, go back! */
- fseek(bits, ftell_position, SEEK_SET);
- FreeNALU(nalu);
- return current_header;
- }
- img->idr_flag = (nalu->nal_unit_type == NALU_TYPE_IDR);
- img->nal_reference_idc = nalu->nal_reference_idc;
- img->disposable_flag = (nalu->nal_reference_idc == NALU_PRIORITY_DISPOSABLE);
- currSlice->dp_mode = PAR_DP_3;
- currSlice->max_part_nr = 3;
- currSlice->ei_flag = 0;
- currStream = currSlice->partArr[0].bitstream;
- currStream->ei_flag = 0;
- currStream->frame_bitoffset = currStream->read_len = 0;
- memcpy (currStream->streamBuffer, &nalu->buf[1], nalu->len-1);
- currStream->code_len = currStream->bitstream_length = RBSPtoSODB(currStream->streamBuffer, nalu->len-1); //++ 剔除停止位元和填充位元
- BitsUsedByHeader = FirstPartOfSliceHeader();
- UseParameterSet (currSlice->pic_parameter_set_id);
- BitsUsedByHeader += RestOfSliceHeader ();
- FmoInit (active_pps, active_sps);
- if(is_new_picture())
- {
- init_picture(img, input);
- current_header = SOP;
- CheckZeroByteVCL(nalu, &ret);
- }
- else
- current_header = SOS;
- init_lists(img->type, img->currentSlice->structure);
- reorder_lists (img->type, img->currentSlice);
- if (img->structure==FRAME)
- {
- init_mbaff_lists();
- }
- // From here on, active_sps, active_pps and the slice header are valid
- if (img->MbaffFrameFlag)
- img->current_mb_nr = currSlice->start_mb_nr << 1="" style="color: #0000ff">else
- img->current_mb_nr = currSlice->start_mb_nr;
- /*
- LC:
- Now I need to read the slice ID, which depends on the value of
- redundant_pic_cnt_present_flag (pag.49).
- */
- slice_id_a = ue_v("NALU:SLICE_A slice_idr", currStream);
- if (active_pps->entropy_coding_mode_flag)
- {
- int ByteStartPosition = currStream->frame_bitoffset/8;
- if (currStream->frame_bitoffset%8 != 0)
- {
- ByteStartPosition++;
- }
- arideco_start_decoding (&currSlice->partArr[0].de_cabac, currStream->streamBuffer, ByteStartPosition, &currStream->read_len, img->type);
- }
- // printf ("read_new_slice: returning %s/n", current_header == SOP?"SOP":"SOS");
- break;
- case NALU_TYPE_DPB:
- /* LC: inserting the code related to DP processing */
- currStream = currSlice->partArr[1].bitstream;
- currStream->ei_flag = 0;
- currStream->frame_bitoffset = currStream->read_len = 0;
- memcpy (currStream->streamBuffer, &nalu->buf[1], nalu->len-1);
- currStream->code_len = currStream->bitstream_length = RBSPtoSODB(currStream->streamBuffer, nalu->len-1);
- slice_id_b = ue_v("NALU:SLICE_B slice_idr", currStream);
- if (active_pps->redundant_pic_cnt_present_flag)
- redundant_pic_cnt_b = ue_v("NALU:SLICE_B redudand_pic_cnt", currStream);
- else
- redundant_pic_cnt_b = 0;
- /* LC: Initializing CABAC for the current data stream. */
- if (active_pps->entropy_coding_mode_flag)
- {
- int ByteStartPosition = currStream->frame_bitoffset/8;
- if (currStream->frame_bitoffset % 8 != 0)
- ByteStartPosition++;
- arideco_start_decoding (&currSlice->partArr[1].de_cabac, currStream->streamBuffer,
- ByteStartPosition, &currStream->read_len, img->type);
- }
- /* LC: resilience code to be inserted */
- /* FreeNALU(nalu); */
- /* return current_header; */
- break;
IDR引數解析/*!
- <pre name="code" class="cpp"> ************************************************************************
- * /brief
- * read the first part of the header (only the pic_parameter_set_id)
- * /return
- * Length of the first part of the slice header (in bits)
- ************************************************************************
- */
- //++ 參見標準7.3.3
- int FirstPartOfSliceHeader()
- {
- Slice *currSlice = img->currentSlice;
- int dP_nr = assignSE2partition[currSlice->dp_mode][SE_HEADER];
- DataPartition *partition = &(currSlice->partArr[dP_nr]);
- Bitstream *currStream = partition->bitstream;
- int tmp;
- UsedBits= partition->bitstream->frame_bitoffset; // was hardcoded to 31 for previous start-code. This is better.
- // Get first_mb_in_slice
- currSlice->start_mb_nr = ue_v ("SH: first_mb_in_slice", currStream);
- tmp = ue_v ("SH: slice_type", currStream);
- if (tmp>4) tmp -=5;
- img->type = currSlice->picture_type = (SliceType) tmp;
- currSlice->pic_parameter_set_id = ue_v ("SH: pic_parameter_set_id", currStream);
- return UsedBits;
- }
- </pre><br><br>
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