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72 lines
2.0 KiB
72 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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