| /****************************************************************************** |
| * |
| * Copyright (C) 2015 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. |
| * |
| ***************************************************************************** |
| * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore |
| */ |
| |
| /*****************************************************************************/ |
| /* */ |
| /* File Name : ih264d_vui.c */ |
| /* */ |
| /* Description : This file contains routines to parse VUI NAL's */ |
| /* */ |
| /* List of Functions : <List the functions defined in this file> */ |
| /* */ |
| /* Issues / Problems : None */ |
| /* */ |
| /* Revision History : */ |
| /* */ |
| /* DD MM YYYY Author(s) Changes (Describe the changes made) */ |
| /* 25 05 2005 NS Draft */ |
| /* */ |
| /*****************************************************************************/ |
| |
| #include "ih264_typedefs.h" |
| #include "ih264_macros.h" |
| #include "ih264_platform_macros.h" |
| #include "ih264d_vui.h" |
| #include "ih264d_bitstrm.h" |
| #include "ih264d_parse_cavlc.h" |
| #include "ih264d_structs.h" |
| #include "ih264d_error_handler.h" |
| |
| /*****************************************************************************/ |
| /* */ |
| /* Function Name : ih264d_parse_hrd_parametres */ |
| /* */ |
| /* Description : This function parses hrd_t parametres */ |
| /* Inputs : ps_hrd pointer to HRD params */ |
| /* ps_bitstrm Bitstream */ |
| /* Globals : None */ |
| /* Processing : Parses HRD params */ |
| /* Outputs : None */ |
| /* Returns : None */ |
| /* */ |
| /* Issues : None */ |
| /* */ |
| /* Revision History: */ |
| /* */ |
| /* DD MM YYYY Author(s) Changes (Describe the changes made) */ |
| /* 06 05 2002 NS Draft */ |
| /* */ |
| /*****************************************************************************/ |
| |
| WORD32 ih264d_parse_hrd_parametres(hrd_t *ps_hrd, |
| dec_bit_stream_t *ps_bitstrm) |
| { |
| UWORD8 u1_index; |
| UWORD32 *pu4_bitstrm_ofst = &ps_bitstrm->u4_ofst; |
| UWORD32 *pu4_bitstrm_buf = ps_bitstrm->pu4_buffer; |
| |
| ps_hrd->u4_cpb_cnt = 1 |
| + ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf); |
| if(ps_hrd->u4_cpb_cnt > 31) |
| return ERROR_INV_SPS_PPS_T; |
| ps_hrd->u1_bit_rate_scale = ih264d_get_bits_h264(ps_bitstrm, 4); |
| ps_hrd->u1_cpb_size_scale = ih264d_get_bits_h264(ps_bitstrm, 4); |
| |
| for(u1_index = 0; u1_index < (UWORD8)ps_hrd->u4_cpb_cnt; u1_index++) |
| { |
| ps_hrd->u4_bit_rate[u1_index] = 1 |
| + ih264d_uev(pu4_bitstrm_ofst, |
| pu4_bitstrm_buf); |
| ps_hrd->u4_cpb_size[u1_index] = 1 |
| + ih264d_uev(pu4_bitstrm_ofst, |
| pu4_bitstrm_buf); |
| ps_hrd->u1_cbr_flag[u1_index] = ih264d_get_bits_h264(ps_bitstrm, 1); |
| } |
| |
| ps_hrd->u1_initial_cpb_removal_delay = 1 |
| + ih264d_get_bits_h264(ps_bitstrm, 5); |
| ps_hrd->u1_cpb_removal_delay_length = 1 |
| + ih264d_get_bits_h264(ps_bitstrm, 5); |
| ps_hrd->u1_dpb_output_delay_length = 1 |
| + ih264d_get_bits_h264(ps_bitstrm, 5); |
| ps_hrd->u1_time_offset_length = ih264d_get_bits_h264(ps_bitstrm, 5); |
| |
| return OK; |
| } |
| |
| /*****************************************************************************/ |
| /* */ |
| /* Function Name : ih264d_parse_vui_parametres */ |
| /* */ |
| /* Description : This function parses VUI NALs. */ |
| /* Inputs : ps_vu4 pointer to VUI params */ |
| /* ps_bitstrm Bitstream */ |
| /* Globals : None */ |
| /* Processing : Parses VUI NAL's units and stores the info */ |
| /* Outputs : None */ |
| /* Returns : None */ |
| /* */ |
| /* Issues : None */ |
| /* */ |
| /* Revision History: */ |
| /* */ |
| /* DD MM YYYY Author(s) Changes (Describe the changes made) */ |
| /* 06 05 2002 NS Draft */ |
| /* */ |
| /*****************************************************************************/ |
| |
| WORD32 ih264d_parse_vui_parametres(vui_t *ps_vu4, |
| dec_bit_stream_t *ps_bitstrm) |
| { |
| UWORD8 u4_bits; |
| UWORD32 *pu4_bitstrm_ofst = &ps_bitstrm->u4_ofst; |
| UWORD32 *pu4_bitstrm_buf = ps_bitstrm->pu4_buffer; |
| WORD32 ret; |
| |
| u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1); |
| if(u4_bits) |
| { |
| u4_bits = ih264d_get_bits_h264(ps_bitstrm, 8); |
| ps_vu4->u1_aspect_ratio_idc = (UWORD8)u4_bits; |
| if(VUI_EXTENDED_SAR == u4_bits) |
| { |
| ps_vu4->u2_sar_width = ih264d_get_bits_h264(ps_bitstrm, 16); |
| ps_vu4->u2_sar_height = ih264d_get_bits_h264(ps_bitstrm, 16); |
| } |
| } |
| |
| u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1); |
| if(u4_bits) |
| { |
| ps_vu4->u1_overscan_appropriate_flag = ih264d_get_bits_h264( |
| ps_bitstrm, 1); |
| } |
| u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1); |
| /* Initialize to unspecified (5 for video_format and |
| 2 for colour_primaries, tfr_chars, matrix_coeffs */ |
| ps_vu4->u1_video_format = 5; |
| ps_vu4->u1_video_full_range_flag = 0; |
| ps_vu4->u1_colour_primaries = 2; |
| ps_vu4->u1_tfr_chars = 2; |
| ps_vu4->u1_matrix_coeffs = 2; |
| |
| if(u4_bits) |
| { |
| ps_vu4->u1_video_format = ih264d_get_bits_h264(ps_bitstrm, 3); |
| ps_vu4->u1_video_full_range_flag = ih264d_get_bits_h264(ps_bitstrm, |
| 1); |
| u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1); |
| if(u4_bits) |
| { |
| ps_vu4->u1_colour_primaries = ih264d_get_bits_h264(ps_bitstrm, |
| 8); |
| ps_vu4->u1_tfr_chars = ih264d_get_bits_h264(ps_bitstrm, 8); |
| ps_vu4->u1_matrix_coeffs = ih264d_get_bits_h264(ps_bitstrm, 8); |
| } |
| } |
| |
| u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1); |
| if(u4_bits) |
| { |
| ps_vu4->u1_cr_top_field = ih264d_uev(pu4_bitstrm_ofst, |
| pu4_bitstrm_buf); |
| ps_vu4->u1_cr_bottom_field = ih264d_uev(pu4_bitstrm_ofst, |
| pu4_bitstrm_buf); |
| } |
| |
| u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1); |
| if(u4_bits) |
| { |
| ps_vu4->u4_num_units_in_tick = ih264d_get_bits_h264(ps_bitstrm, 32); |
| ps_vu4->u4_time_scale = ih264d_get_bits_h264(ps_bitstrm, 32); |
| ps_vu4->u1_fixed_frame_rate_flag = ih264d_get_bits_h264(ps_bitstrm, |
| 1); |
| } |
| |
| u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1); |
| ps_vu4->u1_nal_hrd_params_present = u4_bits; |
| if(u4_bits) |
| { |
| ret = ih264d_parse_hrd_parametres(&ps_vu4->s_nal_hrd, ps_bitstrm); |
| if(ret != OK) |
| return ret; |
| } |
| u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1); |
| ps_vu4->u1_vcl_hrd_params_present = u4_bits; |
| if(u4_bits) |
| { |
| ret = ih264d_parse_hrd_parametres(&ps_vu4->s_vcl_hrd, ps_bitstrm); |
| if(ret != OK) |
| return ret; |
| } |
| |
| if(ps_vu4->u1_nal_hrd_params_present || u4_bits) |
| { |
| ps_vu4->u1_low_delay_hrd_flag = ih264d_get_bits_h264(ps_bitstrm, 1); |
| } |
| ps_vu4->u1_pic_struct_present_flag = ih264d_get_bits_h264(ps_bitstrm, 1); |
| |
| ps_vu4->u1_bitstream_restriction_flag = ih264d_get_bits_h264(ps_bitstrm, 1); |
| |
| if(ps_vu4->u1_bitstream_restriction_flag) |
| { |
| ps_vu4->u1_mv_over_pic_boundaries_flag = ih264d_get_bits_h264( |
| ps_bitstrm, 1); |
| ps_vu4->u4_max_bytes_per_pic_denom = ih264d_uev(pu4_bitstrm_ofst, |
| pu4_bitstrm_buf); |
| ps_vu4->u4_max_bits_per_mb_denom = ih264d_uev(pu4_bitstrm_ofst, |
| pu4_bitstrm_buf); |
| ps_vu4->u4_log2_max_mv_length_horz = ih264d_uev(pu4_bitstrm_ofst, |
| pu4_bitstrm_buf); |
| ps_vu4->u4_log2_max_mv_length_vert = ih264d_uev(pu4_bitstrm_ofst, |
| pu4_bitstrm_buf); |
| ps_vu4->u4_num_reorder_frames = ih264d_uev(pu4_bitstrm_ofst, |
| pu4_bitstrm_buf); |
| ps_vu4->u4_max_dec_frame_buffering = ih264d_uev(pu4_bitstrm_ofst, |
| pu4_bitstrm_buf); |
| } |
| else |
| { |
| /* Setting this to a large value if not present */ |
| ps_vu4->u4_num_reorder_frames = 64; |
| ps_vu4->u4_max_dec_frame_buffering = 64; |
| } |
| |
| return OK; |
| } |
