FreeCalypso > hg > freecalypso-citrine
annotate L1/audio_include/l1audio_btapi.h @ 0:75a11d740a02
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author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Thu, 09 Jun 2016 00:02:41 +0000 |
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1 /**************************************************** |
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2 / FILE NAME:- BT_L1_API.h file. |
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3 / ****************************************************/ |
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4 #include "../../include/config.h" |
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5 #include "../include/l1_confg.h" |
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6 #include "../include/l1_types.h" |
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7 #if(L1_BT_AUDIO==1) |
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8 |
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9 /**************************************************** |
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10 / Data structure defination |
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11 / ****************************************************/ |
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12 #define BT_STATUS_ERROR 1 |
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13 #define BT_STATUS_OK 0 |
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14 |
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15 /*------------------------------------------------------------------------------- |
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16 * L1AudioPcmStatus type |
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17 * |
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18 * Defines status of current PCM buffer |
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19 * |
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20 */ |
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21 typedef unsigned char L1AudioPcmStatus; |
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22 |
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23 #define L1_PCM_READY (0x01) /* the next PCM block is ready */ |
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24 #define L1_PCM_PENDING (0x02) /* the next PCM block is not ready yet. |
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25 a callback will be made when it will be ready */ |
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26 #define L1_PCM_MEDIA_ENDED (0x03) /* no PCM blocks are available anymore. |
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27 (e.g. current track ended) */ |
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28 #define L1_PCM_FAILED (0x04) /* no PCM blocks are ready. general failure */ |
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29 |
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30 typedef struct _L1AudioPcmBlock |
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31 { |
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32 UWORD8 *pcmBuffer; /* a pointer to the buffer holding the PCM data */ |
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33 int lengthInBytes; /* how many bytes are currently in the PCM buffer */ |
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34 } L1AudioPcmBlock; |
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35 |
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36 /****************************************************/ |
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37 typedef struct _L1AudioPcmConfig |
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38 { |
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39 int sampleRate; /* PCM sample rate in Hz (e.g. 44100, 48000, 32000, 16000) */ |
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40 short numChannels; /* number of audio channels (1 or 2, for mono or stereo) */ |
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41 short bitsPerSample; /* number of bits per PCM sample. must always be 16. */ |
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42 } L1AudioPcmConfig; |
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43 /****************************************************/ |
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44 |
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45 /****************************************************/ |
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46 typedef void (*L1AudioPcmCallback)(L1AudioPcmBlock *pcmBlock); |
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47 /*Description:- A callback function, implemented at BTHAL_MM, which will be called by L1-MCU to send a ready PCM block. |
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48 The callback will be called by L1-MCU only after a previous call from BTHAL_MM to request a PCM block returned Pending. |
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49 NOTE: Since the callback is called from L1 context, the BTHAL_MM code should not spend considerable time in this function. |
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50 It must not block the L1-MCU task. |
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51 |
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52 Parameters: |
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53 pcmBlock [in] - a pointer to a PCM block structure |
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54 Returns: void |
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55 */ |
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56 |
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57 /****************************************************/ |
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58 typedef void (*L1AudioConfigureCallback) (L1AudioPcmConfig *pcmConfig); |
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59 |
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60 /*Description:- A callback function, implemented at BTHAL_MM, that will be called by MCU-L1 to specify the next PCM configuration. |
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61 L1-MCU will call this function before a new audio track is going to start playing. BT side will use this info to reconfigure the current |
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62 A2DP stream, and after the configuration is completed, it will start pulling PCM blocks from the L1-MCU stack. |
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63 Parameters: pcmConfig [in] - pointer to struct with the PCM config info |
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64 */ |
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65 |
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66 /****************************************************/ |
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67 |
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68 |
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69 BOOL L1Audio_InformBtAudioPathState (BOOL connected); |
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70 /*Description: - This function is implemented in L1-MCU and called by BTHAL_MM to inform L1, |
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71 whether the audio path to BT is up or down. The use of this function is optional. It should be used by BTHAL_MM, |
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72 to find out that L1-MCU is not being told byBMI/MMI, whether to use the BT audio or not. |
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73 |
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74 Parameters:- connected [in] - |
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75 TRUE - path is valid, MM should send the PCM to BT |
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76 FALSE - path is not valid, MM should send the PCM to handset default audio device |
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77 Returns: void |
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78 */ |
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79 |
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80 /****************************************************/ |
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81 void L1Audio_RegisterBthal (L1AudioPcmCallback pcmCallback, L1AudioConfigureCallback configCallback); |
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82 /*Description: - This function is implemented in L1-MCU and called by BTHAL_MM to init the L1-MCU for BT audio |
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83 and to register callback functions that the L1-MCU will need to call into BTHAL. |
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84 |
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85 Parameters: |
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86 pcmCallback [in] - pointer of the PCM callback function. |
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87 configCallback [in] - pointer of the config callback function. |
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88 Returns: void |
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89 */ |
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90 |
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91 |
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92 /****************************************************/ |
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93 L1AudioPcmStatus L1Audio_PullPcmBlock (L1AudioPcmBlock *pcmBlock); |
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94 /*Description: - This function is implemented in L1-MCU and called by BTHAL_MM to pull the next PCM block. |
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95 If L1 already has a ready PCM block it should fill he pcmBlock parameter and return L1_PCM_READY. |
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96 If a block is not ready yet, it should return with proper return type as defined below. |
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97 |
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98 Parameters: |
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99 pcmBlock [out] - a pointer to PCM block struct. if the function returns MM_PCM_READY, MM should fill this struct with the info of the current ready PCM block . |
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100 Returns: |
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101 L1_PCM_READY: The next PCM block is ready now |
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102 L1_PCM_PENDING: The next PCM block is not ready yet, a callback will be made by MM when it is ready |
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103 L1_PCM_MEDIA_ENDED: no more PCM blocks will be available anymore for the current track |
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104 L1_PCM_FAILED: other failures |
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105 */ |
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106 |
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107 /****************************************************/ |
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108 |
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109 #endif |