1 /* 2 * Copyright 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 // 18 // A2DP constants for AAC codec 19 // 20 21 #ifndef A2DP_AAC_CONSTANTS_H 22 #define A2DP_AAC_CONSTANTS_H 23 24 // AAC codec specific settings 25 #define A2DP_AAC_CODEC_LEN 8 26 27 // [Octet 0] Object Type 28 #define A2DP_AAC_OBJECT_TYPE_MPEG2_LC 0x80 /* MPEG-2 Low Complexity */ 29 #define A2DP_AAC_OBJECT_TYPE_MPEG4_LC 0x40 /* MPEG-4 Low Complexity */ 30 #define A2DP_AAC_OBJECT_TYPE_MPEG4_LTP 0x20 /* MPEG-4 Long Term Prediction */ 31 #define A2DP_AAC_OBJECT_TYPE_MPEG4_SCALABLE 0x10 32 // [Octet 1] Sampling Frequency - 8000 to 44100 33 #define A2DP_AAC_SAMPLING_FREQ_MASK0 0xFF 34 #define A2DP_AAC_SAMPLING_FREQ_8000 0x80 35 #define A2DP_AAC_SAMPLING_FREQ_11025 0x40 36 #define A2DP_AAC_SAMPLING_FREQ_12000 0x20 37 #define A2DP_AAC_SAMPLING_FREQ_16000 0x10 38 #define A2DP_AAC_SAMPLING_FREQ_22050 0x08 39 #define A2DP_AAC_SAMPLING_FREQ_24000 0x04 40 #define A2DP_AAC_SAMPLING_FREQ_32000 0x02 41 #define A2DP_AAC_SAMPLING_FREQ_44100 0x01 42 // [Octet 2], [Bits 4-7] Sampling Frequency - 48000 to 96000 43 // NOTE: Bits offset for the higher-order octet 16-bit integer 44 #define A2DP_AAC_SAMPLING_FREQ_MASK1 (0xF0 << 8) 45 #define A2DP_AAC_SAMPLING_FREQ_48000 (0x80 << 8) 46 #define A2DP_AAC_SAMPLING_FREQ_64000 (0x40 << 8) 47 #define A2DP_AAC_SAMPLING_FREQ_88200 (0x20 << 8) 48 #define A2DP_AAC_SAMPLING_FREQ_96000 (0x10 << 8) 49 // [Octet 2], [Bits 2-3] Channel Mode 50 #define A2DP_AAC_CHANNEL_MODE_MASK 0x0C 51 #define A2DP_AAC_CHANNEL_MODE_MONO 0x08 52 #define A2DP_AAC_CHANNEL_MODE_STEREO 0x04 53 // [Octet 2], [Bits 0-1] RFA 54 // [Octet 3], [Bit 7] Variable Bit Rate Supported 55 #define A2DP_AAC_VARIABLE_BIT_RATE_MASK 0x80 56 #define A2DP_AAC_VARIABLE_BIT_RATE_ENABLED 0x80 57 #define A2DP_AAC_VARIABLE_BIT_RATE_DISABLED 0x00 58 // [Octet 3], [Bits 0-6] Bit Rate - Bits 16-22 in the 23-bit UiMsbf 59 #define A2DP_AAC_BIT_RATE_MASK0 (0x7F << 16) 60 #define A2DP_AAC_BIT_RATE_MASK1 (0xFF << 8) 61 #define A2DP_AAC_BIT_RATE_MASK2 0xFF 62 // [Octet 4], [Bits 0-7] Bit Rate - Bits 8-15 in the 23-bit UiMsfb 63 // [Octet 5], [Bits 0-7] Bit Rate - Bits 0-7 in the 23-bit UiMsfb 64 65 #endif // A2DP_AAC_CONSTANTS_H 66