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71 lines
2.0 KiB
71 lines
2.0 KiB
/* AudioUtil.h |
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* |
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* Copyright (C) 2012 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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#ifndef ALSA_SOUND_AUDIO_UTIL_H |
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#define ALSA_SOUND_AUDIO_UTIL_H |
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#define BIT(nr) (1UL << (nr)) |
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#define MAX_EDID_BLOCKS 10 |
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#define MAX_SHORT_AUDIO_DESC_CNT 30 |
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#define MIN_AUDIO_DESC_LENGTH 3 |
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#define MIN_SPKR_ALLOCATION_DATA_LENGTH 3 |
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typedef enum EDID_AUDIO_FORMAT_ID { |
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LPCM = 1, |
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AC3, |
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MPEG1, |
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MP3, |
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MPEG2_MULTI_CHANNEL, |
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AAC, |
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DTS, |
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ATRAC, |
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SACD, |
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DOLBY_DIGITAL_PLUS, |
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DTS_HD, |
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MAT, |
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DST, |
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WMA_PRO |
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} EDID_AUDIO_FORMAT_ID; |
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typedef struct EDID_AUDIO_BLOCK_INFO { |
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EDID_AUDIO_FORMAT_ID nFormatId; |
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int nSamplingFreq; |
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int nBitsPerSample; |
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int nChannels; |
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} EDID_AUDIO_BLOCK_INFO; |
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typedef struct EDID_AUDIO_INFO { |
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int nAudioBlocks; |
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unsigned char nSpeakerAllocation[MIN_SPKR_ALLOCATION_DATA_LENGTH]; |
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EDID_AUDIO_BLOCK_INFO AudioBlocksArray[MAX_EDID_BLOCKS]; |
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} EDID_AUDIO_INFO; |
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class AudioUtil { |
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public: |
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//Parses EDID audio block when if HDMI is connected to determine audio sink capabilities. |
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static bool getHDMIAudioSinkCaps(EDID_AUDIO_INFO*); |
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private: |
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static int printFormatFromEDID(unsigned char format); |
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static int getSamplingFrequencyFromEDID(unsigned char byte); |
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static int getBitsPerSampleFromEDID(unsigned char byte, |
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unsigned char format); |
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static bool getSpeakerAllocation(EDID_AUDIO_INFO* pInfo); |
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}; |
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#endif /* ALSA_SOUND_AUDIO_UTIL_H */
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