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Add getCodecCapabilities as a supported function.

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Add the ability to get a list of supported codecs and their capabilites
through the HIDL interface.

Bug: 111519504
Test: Compile
Change-Id: I61dff240a98d59cb99b526d8988d0d0245140ee4
This commit is contained in:
Ajay Panicker 2019-01-21 22:36:32 -08:00
parent 94acf41dcc
commit 5f0e90ece7
5 changed files with 195 additions and 68 deletions
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12
bluetooth/audio/2.0/Android.bp
View file

@ -16,13 +16,25 @@ hidl_interface {
],
types: [
"AacObjectType",
"AacParameters",
"AacVariableBitRate",
"AptxParameters",
"AudioCapabilities",
"AudioConfiguration",
"BitsPerSample",
"ChannelMode",
"CodecCapabilities",
"CodecConfiguration",
"CodecType",
"LdacChannelMode",
"LdacParameters",
"LdacQualityIndex",
"PcmParameters",
"SampleRate",
"SbcAllocMethod",
"SbcBlockLength",
"SbcChannelMode",
"SbcParameters",
"SessionType",
"Status",
"TimeSpec",

3
bluetooth/audio/2.0/IBluetoothAudioPort.hal
View file

@ -27,6 +27,9 @@ import android.hardware.audio.common@5.0::SourceMetadata;
*
* Moreover, the Audio HAL can also get the presentation position of the stream
* and provide stream metadata.
*
* Note: For HIDL APIs with a "generates" statement, the callback parameter used
* for return value must be invoked synchronously before the API call returns.
*/
interface IBluetoothAudioPort {
/**

15
bluetooth/audio/2.0/IBluetoothAudioProvider.hal
View file

@ -23,6 +23,9 @@ import IBluetoothAudioPort;
*
* The Bluetooth stack calls methods in this interface to start and end audio
* sessions and sends callback events to the Audio HAL.
*
* Note: For HIDL APIs with a "generates" statement, the callback parameter used
* for return value must be invoked synchronously before the API call returns.
*/
interface IBluetoothAudioProvider {
@ -35,8 +38,10 @@ interface IBluetoothAudioProvider {
* Note: endSession() must be called to unregister this IBluetoothAudioPort
*
* @param hostIf An instance of IBluetoothAudioPort for stream control
* @param codecConfig The codec configuration negotiated with the remote
* device
* @param audioConfig The audio configuration negotiated with the remote
* device. The PCM parameters are set if software based encoding,
* otherwise the correct codec configuration is used for hardware
* encoding.
*
* @return status One of the following
* SUCCESS if this IBluetoothAudioPort was successfully registered with
@ -47,10 +52,10 @@ interface IBluetoothAudioProvider {
* any other reason
* @return dataMQ The fast message queue for audio data from this provider.
* Audio data will be in PCM format as specified by the
* codecConfig.pcmDataConfiguration parameter.
* nullptr if streaming is offloaded to hardware or on failure.
* audioConfig.pcmConfig parameter.
* Invalid if streaming is offloaded to hardware or on failure.
*/
startSession(IBluetoothAudioPort hostIf, CodecConfiguration codecConfig)
startSession(IBluetoothAudioPort hostIf, AudioConfiguration audioConfig)
generates (Status status, fmq_sync<uint8_t> dataMQ);
/**

25
bluetooth/audio/2.0/IBluetoothAudioProvidersFactory.hal
View file

@ -25,6 +25,9 @@ import IBluetoothAudioProvider;
* When the Bluetooth stack is ready to create an audio session, it must first
* obtain the IBluetoothAudioProvider for that session type by calling
* openProvider().
*
* Note: For HIDL APIs with a "generates" statement, the callback parameter used
* for return value must be invoked synchronously before the API call returns.
*/
interface IBluetoothAudioProvidersFactory {
@ -43,4 +46,26 @@ interface IBluetoothAudioProvidersFactory {
*/
openProvider(SessionType sessionType)
generates (Status status, IBluetoothAudioProvider provider);
/**
* Gets a list of audio capabilities for a session type.
*
* For software encoding, the PCM capabilities are returned.
* For hardware encoding, the supported codecs and their capabilities are
* returned.
*
* @param sessionType The session type (e.g.
* A2DP_SOFTWARE_ENCODING_DATAPATH).
* @return audioCapabilities A list containing all the capabilities
* supported by the sesson type. The capabilities is a list of
* available options when configuring the codec for the session.
* For software encoding it is the PCM data rate.
* For hardware encoding it is the list of supported codecs and their
* capabilities.
* If a provider isn't supported, an empty list should be returned.
* Note: Only one entry should exist per codec when using hardware
* encoding.
*/
getProviderCapabilities(SessionType sessionType)
generates (vec<AudioCapabilities> audioCapabilities);
};

208
bluetooth/audio/2.0/types.hal
View file

@ -16,6 +16,14 @@
package android.hardware.bluetooth.audio@2.0;
/**
* The different audio parameter structs are used to provide a method to list
* all the Capabilities of a codec as well as to configure the codecs. All
* fields are bitfields unless specified. If used as a configuration, only one
* bit may be enabled. If used for Capabilities, enable all bits corresponding to
* supported features.
*/
/**
* POSIX timespec.
*/
@ -85,6 +93,25 @@ enum SbcChannelMode : uint8_t {
MONO = 0x08,
};
enum SbcBlockLength : uint8_t {
BLOCKS_4 = 0x80,
BLOCKS_8 = 0x40,
BLOCKS_12 = 0x20,
BLOCKS_16 = 0x10,
};
enum SbcNumSubbands : uint8_t {
SUBBAND_4 = 0x08,
SUBBAND_8 = 0x04,
};
enum SbcAllocMethod : uint8_t {
/** SNR */
ALLOC_MD_S = 0x02,
/** Loudness */
ALLOC_MD_L = 0x01,
};
enum AacObjectType : uint8_t {
/** MPEG-2 Low Complexity. Support is Mandatory. */
MPEG2_LC = 0x80,
@ -96,6 +123,11 @@ enum AacObjectType : uint8_t {
MPEG4_SCALABLE = 0x10,
};
enum AacVariableBitRate : uint8_t {
ENABLED = 0x80,
DISABLED = 0x00,
};
enum LdacChannelMode : uint8_t {
/** Channel Mode: 3 bits */
UNKNOWN = 0x00,
@ -104,67 +136,117 @@ enum LdacChannelMode : uint8_t {
MONO = 0x04,
};
struct CodecConfiguration {
/** Audio PCM data configuration */
struct PcmDataConfiguration {
/** Sampling rate for encoder */
SampleRate sampleRate;
/** Bits per sample for encoder */
BitsPerSample bitsPerSample;
/** Channel mode for encoder */
ChannelMode channelMode;
} pcmDataConfiguration;
/** Encoded audio data codec configuration. It is used only if the
* HAL is responsible for encoding the PCM audio data. */
struct EncodedDataConfiguration {
/** Bluetooth A2DP codec */
CodecType codecType;
/**
* The encoded audio bitrate in bits / second.
* 0x00000000 - The audio bitrate is not specified / unused
* 0x00000001 - 0x00FFFFFF - Encoded audio bitrate in bits/second
* 0x01000000 - 0xFFFFFFFF - Reserved
*/
uint32_t encodedAudioBitrate;
/** Peer MTU (in octets) */
uint16_t peerMtu;
/** Content protection by SCMS-T */
bool isScmstEnabled;
safe_union CodecSpecific {
/**
* SBC Codec specific information
* Refer to SBC Codec specific information elements in A2DP v1.3
* Profile Specification.
*/
struct SbcData {
/** Reserved: 4 bits | Channel Mode: 4 bits */
SbcChannelMode channelMode;
/** Block length: 4 bits | Subbands: 2 bits | Allocation Method: 2 bits */
uint8_t codecParameters;
/** Minimum bitpool value */
uint8_t minBitpool;
/** Maximum bitpool value */
uint8_t maxBitpool;
} sbcData;
struct AacData {
/** AAC Object Type */
AacObjectType aacObjectType;
/** True if Variable Bit Rate is enabled */
bool variableBitRateEnabled;
} aacData;
struct LdacData {
/** Reserved: 5 bits | Channel Mode: 3 bits */
LdacChannelMode channelMode;
/**
* LDAC bitrate index value:
* 0x00 - High
* 0x01 - Mid
* 0x02 - Low
* 0x7F - ABR (Adaptive Bit Rate)
*/
uint8_t bitrateIndex;
} ldacData;
} codecSpecific;
} encodedDataConfiguration;
enum LdacQualityIndex : uint8_t {
// 990kbps
QUALITY_HIGH = 0x00,
// 660kbps
QUALITY_MID = 0x01,
// 330kbps
QUALITY_LOW = 0x02,
// Adaptive Bit Rate mode
QUALITY_ABR = 0x7F,
};
/** Used for Software Encoding audio feed parameters */
struct PcmParameters {
SampleRate sampleRate;
ChannelMode channelMode;
BitsPerSample bitsPerSample;
};
/**
* Used for Hardware Encoding SBC codec parameters.
* minBitpool and maxBitpool are not bitfields.
*/
struct SbcParameters {
SampleRate sampleRate;
SbcChannelMode channelMode;
SbcBlockLength blockLength;
SbcNumSubbands numSubbands;
SbcAllocMethod allocMethod;
BitsPerSample bitsPerSample;
uint8_t minBitpool;
uint8_t maxBitpool;
};
/** Used for Hardware Encoding AAC codec parameters */
struct AacParameters {
AacObjectType objectType;
SampleRate sampleRate;
ChannelMode channelMode;
AacVariableBitRate variableBitRateEnabled;
BitsPerSample bitsPerSample;
};
/**
* Used for Hardware Encoding LDAC codec parameters
* Only used when configuring the codec. When Capabilities are requested, this
* field is left empty since all qualities must be supported. Not a bitfield.
*/
struct LdacParameters {
SampleRate sampleRate;
LdacChannelMode channelMode;
LdacQualityIndex qualityIndex;
BitsPerSample bitsPerSample;
};
/** Used for Hardware Encoding AptX and AptX-HD codec parameters */
struct AptxParameters {
SampleRate sampleRate;
ChannelMode channelMode;
BitsPerSample bitsPerSample;
};
/**
* Used to specify the capabilities of the codecs supported by Hardware Encoding.
* AptX and AptX-HD both use the AptxParameters field.
*/
struct CodecCapabilities {
CodecType codecType;
safe_union Capabilities {
SbcParameters sbcCapabilities;
AacParameters aacCapabilities;
LdacParameters ldacCapabilities;
AptxParameters aptxCapabilities;
} capabilities;
};
/** Used to specify the capabilities of the different session types. */
safe_union AudioCapabilities {
PcmParameters pcmCapabilities;
CodecCapabilities codecCapabilities;
};
/**
* Used to configure a Hardware Encoding session.
* AptX and AptX-HD both use the AptxParameters field.
*/
struct CodecConfiguration {
CodecType codecType;
/**
* The encoded audio bitrate in bits / second.
* 0x00000000 - The audio bitrate is not specified / unused
* 0x00000001 - 0x00FFFFFF - Encoded audio bitrate in bits/second
* 0x01000000 - 0xFFFFFFFF - Reserved
*
* The HAL needs to support all legal bitrates for the selected codec.
*/
uint32_t encodedAudioBitrate;
/** Peer MTU (in octets) */
uint16_t peerMtu;
/** Content protection by SCMS-T */
bool isScmstEnabled;
safe_union CodecSpecific {
SbcParameters sbcConfig;
AacParameters aacConfig;
LdacParameters ldacConfig;
AptxParameters aptxConfig;
} config;
};
/** Used to configure either a Hardware or Software Encoding session based on session type */
safe_union AudioConfiguration {
PcmParameters pcmConfig;
CodecConfiguration codecConfig;
};