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      1 /*
      2 **
      3 ** Copyright 2014, The Android Open Source Project
      4 **
      5 ** Licensed under the Apache License, Version 2.0 (the "License");
      6 ** you may not use this file except in compliance with the License.
      7 ** You may obtain a copy of the License at
      8 **
      9 **     http://www.apache.org/licenses/LICENSE-2.0
     10 **
     11 ** Unless required by applicable law or agreed to in writing, software
     12 ** distributed under the License is distributed on an "AS IS" BASIS,
     13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14 ** See the License for the specific language governing permissions and
     15 ** limitations under the License.
     16 */
     17 
     18 #ifndef ANDROID_ALSA_UTILS_H
     19 #define ANDROID_ALSA_UTILS_H
     20 
     21 #include <fcntl.h>
     22 #include <stdint.h>
     23 #include <hardware/audio.h>
     24 
     25 #define kHDMI_ALSADeviceName    "IntelHDMI"
     26 
     27 #ifdef __cplusplus
     28 extern "C"
     29 #endif
     30 int find_alsa_card_by_name(const char* name);
     31 
     32 #ifdef __cplusplus
     33 #include <utils/Vector.h>
     34 #include <utils/Mutex.h>
     35 #include <utils/String8.h>
     36 
     37 namespace android {
     38 
     39 class HDMIAudioCaps {
     40   public:
     41     enum AudFormat {
     42         kFmtInvalid = 0,
     43         kFmtLPCM,
     44         kFmtAC3,
     45         kFmtMP1,
     46         kFmtMP1L3,
     47         kFmtMP2,
     48         kFmtAACLC,
     49         kFmtDTS,
     50         kFmtATRAC,
     51         kFmtDSD,
     52         kFmtEAC3,
     53         kFmtDTSHD,
     54         kFmtMLP,
     55         kFmtDST,
     56         kFmtWMAPRO,
     57         kFmtRefCxt,
     58         kFmtHEAAC,
     59         kFmtHEAAC2,
     60         kFmtMPGSUR
     61     };
     62 
     63     enum SRMask {
     64         kSR_32000 = (1 << 5),
     65         kSR_44100 = (1 << 6),
     66         kSR_48000 = (1 << 7),
     67         kSR_88200 = (1 << 9),
     68         kSR_96000 = (1 << 10),
     69         kSR_176400 = (1 << 11),
     70         kSR_192000 = (1 << 12),
     71     };
     72 
     73     enum BPSMask {
     74         kBPS_16bit = (1 << 17),
     75         kBPS_20bit = (1 << 18),
     76         kBPS_24bit = (1 << 19),
     77     };
     78 
     79     enum SAMask {
     80         kSA_FLFR   = (1 <<  0), // Front Left/Right
     81         kSA_LFE    = (1 <<  1), // LFE (aka, subwoofer)
     82         kSA_FC     = (1 <<  2), // Front Center
     83         kSA_RLRR   = (1 <<  3), // Rear Left/Right
     84         kSA_RC     = (1 <<  4), // Rear Center
     85         kSA_FLCFRC = (1 <<  5), // Front Left/Right Center
     86         kSA_RLCRRC = (1 <<  6), // Rear Left/Right Center
     87         kSA_FLWFRW = (1 <<  7), // Front Left/Right Wide
     88         kSA_FLHFRH = (1 <<  8), // Front Left/Right High
     89         kSA_TC     = (1 <<  9), // Top Center (overhead)
     90         kSA_FCH    = (1 << 10), // Front Center High
     91     };
     92 
     93     typedef struct {
     94         AudFormat fmt;
     95         uint32_t  max_ch;
     96         uint32_t  sr_bitmask;
     97         uint32_t  bps_bitmask;
     98         uint32_t  comp_bitrate;
     99     } Mode;
    100 
    101     HDMIAudioCaps();
    102     ~HDMIAudioCaps() { reset(); }
    103 
    104     bool loadCaps(int ALSADeviceID);
    105     void reset();
    106     void getRatesForAF(String8& rates);
    107     void getFmtsForAF(String8& fmts);
    108     void getChannelMasksForAF(String8& masks);
    109     bool supportsFormat(audio_format_t format,
    110                                       uint32_t sampleRate,
    111                                       uint32_t channelCount);
    112 
    113     bool basicAudioSupport() const { return mBasicAudioSupported; }
    114     uint16_t speakerAllocation() const { return mSpeakerAlloc; }
    115     size_t modeCnt() const { return mModes.size(); }
    116     const Mode& getMode(size_t ndx) const { return mModes[ndx]; }
    117 
    118     static const char* fmtToString(AudFormat fmt);
    119     static uint32_t srMaskToSR(uint32_t mask);
    120     static uint32_t bpsMaskToBPS(uint32_t mask);
    121     static const char* saMaskToString(uint32_t mask);
    122 
    123   private:
    124     Mutex mLock;
    125     bool mBasicAudioSupported;
    126     uint16_t mSpeakerAlloc;
    127     Vector<Mode> mModes;
    128 
    129     void reset_l();
    130     ssize_t getMaxChModeNdx_l();
    131     static bool sanityCheckMode(const Mode& m);
    132 };
    133 }  // namespace android
    134 #endif  // __cplusplus
    135 #endif  // ANDROID_ALSA_UTILS_H
    136