public bool Init(Stream pBuffer, int length) { Clear(); var oldPosition = pBuffer.Position; if (length < 2) { Logger.FATAL("Invalid length:{0}", length); return false; } var bitReader = new BitReader(pBuffer); _audioObjectType = bitReader.ReadBitsToByte(5); if ((_audioObjectType != 1) && (_audioObjectType != 2) && (_audioObjectType != 3) && (_audioObjectType != 4) && (_audioObjectType != 6) && (_audioObjectType != 17) && (_audioObjectType != 19) && (_audioObjectType != 20) && (_audioObjectType != 23) && (_audioObjectType != 39)) { Logger.FATAL("Invalid _audioObjectType: {0}", _audioObjectType); return false; } //3. Read the sample rate index _sampleRateIndex = bitReader.ReadBitsToByte(4); if ((_sampleRateIndex == 13) || (_sampleRateIndex == 14)) { Logger.FATAL("Invalid sample rate: {0}", _sampleRateIndex); return false; } if (_sampleRateIndex == 15) { if (length < 5) { Logger.FATAL("Invalid length:{0}", length); return false; } _sampleRate = (uint)bitReader.ReadBitsToInt(24); } else { var rates = new uint[]{ 96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050, 16000, 12000, 11025, 8000, 7350 }; _sampleRate = rates[_sampleRateIndex]; } //4. read the channel configuration index _channelConfigurationIndex = bitReader.ReadBitsToByte(4); if ((_channelConfigurationIndex == 0) || (_channelConfigurationIndex >= 8)) { Logger.FATAL("Invalid _channelConfigurationIndex: {0}", _channelConfigurationIndex); return false; } pBuffer.Position = oldPosition; _pAAC = new byte[length]; pBuffer.Read(_pAAC, 0, length); _aacLength = (uint) length; return true; }
private bool ReadPPS(BitReader ppsReader, Variant ppsInfo) { //7.3.2.2 Picture parameter set RBSP syntax //14496-10.pdf 44/280 ppsInfo["pic_parameter_set_id"] = ppsReader.ReadExpGolomb("pic_parameter_set_id"); ppsInfo["seq_parameter_set_id"] = ppsReader.ReadExpGolomb("seq_parameter_set_id"); ppsInfo["entropy_coding_mode_flag"] = ppsReader.ReadBool(); ppsInfo["pic_order_present_flag"] = ppsReader.ReadBool(); ppsInfo["num_slice_groups_minus1"] = ppsReader.ReadExpGolomb("num_slice_groups_minus1"); if (ppsInfo["num_slice_groups_minus1"] > 0) { long sliceGroupMapType = ppsInfo["slice_group_map_type"] = ppsReader.ReadExpGolomb("slice_group_map_type"); switch (sliceGroupMapType) { case 0: ppsInfo["run_length_minus1"] = Variant.Get(); for (var i = 0; i < ppsInfo["num_slice_groups_minus1"]; i++) { var val = ppsReader.ReadExpGolomb("run_length_minus1"); ppsInfo["run_length_minus1"].Add(val); } break; case 2: ppsInfo["top_left"] = Variant.Get(); ppsInfo["bottom_right"] = Variant.Get(); for (var i = 0; i < ppsInfo["num_slice_groups_minus1"]; i++) { ppsInfo["top_left"].Add(ppsReader.ReadExpGolomb("top_left")); ppsInfo["bottom_right"].Add(ppsReader.ReadExpGolomb("bottom_right")); } break; case 3: case 4: case 5: ppsInfo["slice_group_change_direction_flag"] = ppsReader.ReadBool(); ppsInfo["slice_group_change_rate_minus1"] = ppsReader.ReadExpGolomb("slice_group_change_rate_minus1"); break; case 6: ppsInfo["pic_size_in_map_units_minus1"] = ppsReader.ReadExpGolomb("pic_size_in_map_units_minus1"); ppsInfo["slice_group_id"] = Variant.Get(); for (var i = 0; i <= ppsInfo["pic_size_in_map_units_minus1"]; i++) { ppsInfo["slice_group_id"].Add(ppsReader.ReadExpGolomb("slice_group_id")); } break; } } ppsInfo["num_ref_idx_l0_active_minus1"] = ppsReader.ReadExpGolomb("num_ref_idx_l0_active_minus1"); ppsInfo["num_ref_idx_l1_active_minus1"] = ppsReader.ReadExpGolomb("num_ref_idx_l1_active_minus1"); ppsInfo["weighted_pred_flag"] = ppsReader.ReadBool(); ppsInfo["weighted_bipred_idc"] = ppsReader.ReadBitsToInt(2); ppsInfo["pic_init_qp_minus26"] = ppsReader.ReadExpGolomb("pic_init_qp_minus26"); ppsInfo["pic_init_qs_minus26"] = ppsReader.ReadExpGolomb("pic_init_qs_minus26"); ppsInfo["chromqp_index_offset"] = ppsReader.ReadExpGolomb("chromqp_index_offset"); ppsInfo["deblocking_filter_control_present_flag"] = ppsReader.ReadBool(); ppsInfo["constrained_intrpred_flag"] = ppsReader.ReadBool(); ppsInfo["redundant_pic_cnt_present_flag"] = ppsReader.ReadBool(); return true; }
private bool ReadSPSVUI(BitReader spsReader, Variant v) { //E.1.1 VUI parameters syntax //14496-10.pdf 267/280 v["aspect_ratio_info_present_flag"] = spsReader.ReadBool(); if (v["aspect_ratio_info_present_flag"]) { v["aspect_ratio_idc"] = spsReader.ReadBitsToByte(); if ((byte)v["aspect_ratio_idc"] == 255) { v["sar_width"] = (ushort)spsReader.ReadBitsToShort(); v["sar_height"] = (ushort)spsReader.ReadBitsToShort(); } } v["overscan_info_present_flag"] = spsReader.ReadBool(); if (v["overscan_info_present_flag"]) v["overscan_appropriate_flag"] = spsReader.ReadBool(); v["video_signal_type_present_flag"] = spsReader.ReadBool(); if (v["video_signal_type_present_flag"]) { v["video_format"] = spsReader.ReadBitsToByte(3); v["video_full_range_flag"] = spsReader.ReadBool(); v["colour_description_present_flag"] = spsReader.ReadBool(); if (v["colour_description_present_flag"]) { v["colour_primaries"] = spsReader.ReadBitsToByte(); v["transfer_characteristics"] = spsReader.ReadBitsToByte(); v["matrix_coefficients"] = spsReader.ReadBitsToByte(); } } v["chromloc_info_present_flag"] = spsReader.ReadBool(); if (v["chromloc_info_present_flag"]) { v["chromsample_loc_type_top_field"] = spsReader.ReadExpGolomb("chromsample_loc_type_top_field"); v["chromsample_loc_type_bottom_field"] = spsReader.ReadExpGolomb("chromsample_loc_type_bottom_field"); } v["timing_info_present_flag"] = spsReader.ReadBool(); if (v["timing_info_present_flag"]) { v["num_units_in_tick"] = spsReader.ReadBitsToInt(); v["time_scale"] = spsReader.ReadBitsToInt(); v["fixed_frame_rate_flag"] = spsReader.ReadBool(); } v["nal_hrd_parameters_present_flag"] = spsReader.ReadBool(); if (v["nal_hrd_parameters_present_flag"]) { if (!ReadSPSVUIHRD(spsReader, v["nal_hrd"] = Variant.Get())) { Logger.FATAL("Unable to read VUIHRD"); return false; } } v["vcl_hrd_parameters_present_flag"] = spsReader.ReadBool(); if (v["vcl_hrd_parameters_present_flag"]) { if (!ReadSPSVUIHRD(spsReader, v["vcl_hrd"] = Variant.Get())) { Logger.FATAL("Unable to read VUIHRD"); return false; } } if (v["nal_hrd_parameters_present_flag"] || v["vcl_hrd_parameters_present_flag"]) v["low_delay_hrd_flag"] = spsReader.ReadBool(); v["pic_struct_present_flag"] = spsReader.ReadBool(); v["bitstream_restriction_flag"] = spsReader.ReadBool(); if (v["bitstream_restriction_flag"]) { v["motion_vectors_over_pic_boundaries_flag"] = spsReader.ReadBool(); v["max_bytes_per_pic_denom"] = spsReader.ReadExpGolomb("max_bytes_per_pic_denom"); v["max_bits_per_mb_denom"] = spsReader.ReadExpGolomb("max_bits_per_mb_denom"); v["log2_max_mv_length_horizontal"] = spsReader.ReadExpGolomb("log2_max_mv_length_horizontal"); v["log2_max_mv_length_vertical"] = spsReader.ReadExpGolomb("log2_max_mv_length_vertical"); v["num_reorder_frames"] = spsReader.ReadExpGolomb("num_reorder_frames"); v["max_dec_frame_buffering"] = spsReader.ReadExpGolomb("max_dec_frame_buffering"); } return true; }