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66 lines
2.5 KiB
66 lines
2.5 KiB
/*
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* Copyright 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//
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// A2DP constants for AAC codec
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//
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#ifndef A2DP_AAC_CONSTANTS_H
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#define A2DP_AAC_CONSTANTS_H
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// AAC codec specific settings
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#define A2DP_AAC_CODEC_LEN 8
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// [Octet 0] Object Type
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#define A2DP_AAC_OBJECT_TYPE_MPEG2_LC 0x80 /* MPEG-2 Low Complexity */
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#define A2DP_AAC_OBJECT_TYPE_MPEG4_LC 0x40 /* MPEG-4 Low Complexity */
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#define A2DP_AAC_OBJECT_TYPE_MPEG4_LTP 0x20 /* MPEG-4 Long Term Prediction */
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#define A2DP_AAC_OBJECT_TYPE_MPEG4_SCALABLE 0x10
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// [Octet 1] Sampling Frequency - 8000 to 44100
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#define A2DP_AAC_SAMPLING_FREQ_MASK0 0xFF
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#define A2DP_AAC_SAMPLING_FREQ_8000 0x80
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#define A2DP_AAC_SAMPLING_FREQ_11025 0x40
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#define A2DP_AAC_SAMPLING_FREQ_12000 0x20
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#define A2DP_AAC_SAMPLING_FREQ_16000 0x10
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#define A2DP_AAC_SAMPLING_FREQ_22050 0x08
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#define A2DP_AAC_SAMPLING_FREQ_24000 0x04
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#define A2DP_AAC_SAMPLING_FREQ_32000 0x02
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#define A2DP_AAC_SAMPLING_FREQ_44100 0x01
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// [Octet 2], [Bits 4-7] Sampling Frequency - 48000 to 96000
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// NOTE: Bits offset for the higher-order octet 16-bit integer
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#define A2DP_AAC_SAMPLING_FREQ_MASK1 (0xF0 << 8)
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#define A2DP_AAC_SAMPLING_FREQ_48000 (0x80 << 8)
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#define A2DP_AAC_SAMPLING_FREQ_64000 (0x40 << 8)
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#define A2DP_AAC_SAMPLING_FREQ_88200 (0x20 << 8)
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#define A2DP_AAC_SAMPLING_FREQ_96000 (0x10 << 8)
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// [Octet 2], [Bits 2-3] Channel Mode
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#define A2DP_AAC_CHANNEL_MODE_MASK 0x0C
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#define A2DP_AAC_CHANNEL_MODE_MONO 0x08
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#define A2DP_AAC_CHANNEL_MODE_STEREO 0x04
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// [Octet 2], [Bits 0-1] RFA
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// [Octet 3], [Bit 7] Variable Bit Rate Supported
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#define A2DP_AAC_VARIABLE_BIT_RATE_MASK 0x80
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#define A2DP_AAC_VARIABLE_BIT_RATE_ENABLED 0x80
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#define A2DP_AAC_VARIABLE_BIT_RATE_DISABLED 0x00
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// [Octet 3], [Bits 0-6] Bit Rate - Bits 16-22 in the 23-bit UiMsbf
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#define A2DP_AAC_BIT_RATE_MASK0 (0x7F << 16)
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#define A2DP_AAC_BIT_RATE_MASK1 (0xFF << 8)
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#define A2DP_AAC_BIT_RATE_MASK2 0xFF
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// [Octet 4], [Bits 0-7] Bit Rate - Bits 8-15 in the 23-bit UiMsfb
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// [Octet 5], [Bits 0-7] Bit Rate - Bits 0-7 in the 23-bit UiMsfb
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#endif // A2DP_AAC_CONSTANTS_H
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