harmony 鸿蒙AudioDecoder

2023-06-24
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AudioDecoder

Overview

The AudioDecoder module provides the functions for audio decoding. This module may not be supported on some devices. You can call CanIUse to check whether your device supports this module.

\@syscap SystemCapability.Multimedia.Media.AudioDecoder

Since

Summary

Files

Name	Description
native_avcodec_audiodecoder.h	Declares the native APIs used for audio decoding. File to include: Library: libnative_media_adec.so
avcodec_audio_channel_layout.h	Declares the enums used for audio codec. File to include: Library: libnative_media_codecbase.so

Enums

Name	Description
AudioChannelSet : uint64_t { FRONT_LEFT = 1ULL << 0U, FRONT_RIGHT = 1ULL << 1U, FRONT_CENTER = 1ULL << 2U, LOW_FREQUENCY = 1ULL << 3U, BACK_LEFT = 1ULL << 4U, BACK_RIGHT = 1ULL << 5U, FRONT_LEFT_OF_CENTER = 1ULL << 6U, FRONT_RIGHT_OF_CENTER = 1ULL << 7U, BACK_CENTER = 1ULL << 8U, SIDE_LEFT = 1ULL << 9U, SIDE_RIGHT = 1ULL << 10U, TOP_CENTER = 1ULL << 11U, TOP_FRONT_LEFT = 1ULL << 12U, TOP_FRONT_CENTER = 1ULL << 13U, TOP_FRONT_RIGHT = 1ULL << 14U, TOP_BACK_LEFT = 1ULL << 15U, TOP_BACK_CENTER = 1ULL << 16U, TOP_BACK_RIGHT = 1ULL << 17U, STEREO_LEFT = 1ULL << 29U, STEREO_RIGHT = 1ULL << 30U, WIDE_LEFT = 1ULL << 31U, WIDE_RIGHT = 1ULL << 32U, SURROUND_DIRECT_LEFT = 1ULL << 33U, SURROUND_DIRECT_RIGHT = 1ULL << 34U, LOW_FREQUENCY_2 = 1ULL << 35U, TOP_SIDE_LEFT = 1ULL << 36U, TOP_SIDE_RIGHT = 1ULL << 37U, BOTTOM_FRONT_CENTER = 1ULL << 38U, BOTTOM_FRONT_LEFT = 1ULL << 39U, BOTTOM_FRONT_RIGHT = 1ULL << 40U, AMBISONICS_ACN0 = 1ULL << 41U, AMBISONICS_ACN1 = 1ULL << 42U, AMBISONICS_ACN2 = 1ULL << 43U, AMBISONICS_ACN3 = 1ULL << 44U, AMBISONICS_W = AMBISONICS_ACN0, AMBISONICS_Y = AMBISONICS_ACN1, AMBISONICS_Z = AMBISONICS_ACN2, AMBISONICS_X = AMBISONICS_ACN3, AMBISONICS_ACN4 = 1ULL << 45U, AMBISONICS_ACN5 = 1ULL << 46U, AMBISONICS_ACN6 = 1ULL << 47U, AMBISONICS_ACN7 = 1ULL << 48U, AMBISONICS_ACN8 = 1ULL << 49U, AMBISONICS_ACN9 = 1ULL << 50U, AMBISONICS_ACN10 = 1ULL << 51U, AMBISONICS_ACN11 = 1ULL << 52U, AMBISONICS_ACN12 = 1ULL << 53U, AMBISONICS_ACN13 = 1ULL << 54U, AMBISONICS_ACN14 = 1ULL << 55U, AMBISONICS_ACN15 = 1ULL << 56U}	Enumerates the audio channel numbers. Each channel number is mapped to a variable of int64.
AudioChannelLayout : uint64_t { UNKNOWN_CHANNEL_LAYOUT = 0, MONO = (AudioChannelSet::FRONT_CENTER), STEREO = (AudioChannelSet::FRONT_LEFT \|AudioChannelSet::FRONT_RIGHT), CH_2POINT1 = (STEREO \|AudioChannelSet::LOW_FREQUENCY), CH_2_1 = (STEREO \|AudioChannelSet::BACK_CENTER), SURROUND = (STEREO \|AudioChannelSet::FRONT_CENTER), CH_3POINT1 = (SURROUND \|AudioChannelSet::LOW_FREQUENCY), CH_4POINT0 = (SURROUND \|AudioChannelSet::BACK_CENTER), CH_4POINT1 = (CH_4POINT0 \|AudioChannelSet::LOW_FREQUENCY), CH_2_2 = (STEREO \|AudioChannelSet::SIDE_LEFT \|AudioChannelSet::SIDE_RIGHT), QUAD = (STEREO \|AudioChannelSet::BACK_LEFT \|AudioChannelSet::BACK_RIGHT), CH_5POINT0 = (SURROUND \|AudioChannelSet::SIDE_LEFT \|AudioChannelSet::SIDE_RIGHT), CH_5POINT1 = (CH_5POINT0 \|AudioChannelSet::LOW_FREQUENCY), CH_5POINT0_BACK = (SURROUND \|AudioChannelSet::BACK_LEFT \|AudioChannelSet::BACK_RIGHT), CH_5POINT1_BACK = (CH_5POINT0_BACK \|AudioChannelSet::LOW_FREQUENCY), CH_6POINT0 = (CH_5POINT0 \|AudioChannelSet::BACK_CENTER), CH_6POINT0_FRONT = (CH_2_2 \|AudioChannelSet::FRONT_LEFT_OF_CENTER \|AudioChannelSet::FRONT_RIGHT_OF_CENTER), HEXAGONAL = (CH_5POINT0_BACK \|AudioChannelSet::BACK_CENTER), CH_6POINT1 = (CH_5POINT1 \|AudioChannelSet::BACK_CENTER), CH_6POINT1_BACK = (CH_5POINT1_BACK \|AudioChannelSet::BACK_CENTER), CH_6POINT1_FRONT = (CH_6POINT0_FRONT \|AudioChannelSet::LOW_FREQUENCY), CH_7POINT0 = (CH_5POINT0 \|AudioChannelSet::BACK_LEFT \|AudioChannelSet::BACK_RIGHT), CH_7POINT0_FRONT = (CH_5POINT0 \|AudioChannelSet::FRONT_LEFT_OF_CENTER \|AudioChannelSet::FRONT_RIGHT_OF_CENTER), CH_7POINT1 = (CH_5POINT1 \|AudioChannelSet::BACK_LEFT \|AudioChannelSet::BACK_RIGHT), CH_7POINT1_WIDE = (CH_5POINT1 \|AudioChannelSet::FRONT_LEFT_OF_CENTER \|AudioChannelSet::FRONT_RIGHT_OF_CENTER), CH_7POINT1_WIDE_BACK, CH_3POINT1POINT2 = (CH_3POINT1 \|AudioChannelSet::TOP_FRONT_LEFT \|AudioChannelSet::TOP_FRONT_RIGHT), CH_5POINT1POINT2 = (CH_5POINT1 \|AudioChannelSet::TOP_SIDE_LEFT \|AudioChannelSet::TOP_SIDE_RIGHT), CH_5POINT1POINT4, CH_7POINT1POINT2 = (CH_7POINT1 \|AudioChannelSet::TOP_SIDE_LEFT \|AudioChannelSet::TOP_SIDE_RIGHT), CH_7POINT1POINT4, CH_9POINT1POINT4 = (CH_7POINT1POINT4 \|AudioChannelSet::WIDE_LEFT \|AudioChannelSet::WIDE_RIGHT), CH_9POINT1POINT6 = (CH_9POINT1POINT4 \|AudioChannelSet::TOP_SIDE_LEFT \|AudioChannelSet::TOP_SIDE_RIGHT), CH_10POINT2, CH_22POINT2, OCTAGONAL = (CH_5POINT0 \|AudioChannelSet::BACK_LEFT \|AudioChannelSet::BACK_CENTER \|AudioChannelSet::BACK_RIGHT), HEXADECAGONAL, STEREO_DOWNMIX = (AudioChannelSet::STEREO_LEFT \|AudioChannelSet::STEREO_RIGHT), HOA_FIRST, HOA_SECOND HOA_THIRD}	Enumerates the types of the audio channel numbers. The output format of the decoder is represented as the channel type of the codec.

Name

Description

AudioChannelSet : uint64_t {
FRONT_LEFT = 1ULL << 0U,
FRONT_RIGHT = 1ULL << 1U,
FRONT_CENTER = 1ULL << 2U,
LOW_FREQUENCY = 1ULL << 3U,
BACK_LEFT = 1ULL << 4U,
BACK_RIGHT = 1ULL << 5U,
FRONT_LEFT_OF_CENTER = 1ULL << 6U,
FRONT_RIGHT_OF_CENTER = 1ULL << 7U,
BACK_CENTER = 1ULL << 8U,
SIDE_LEFT = 1ULL << 9U,
SIDE_RIGHT = 1ULL << 10U,
TOP_CENTER = 1ULL << 11U,
TOP_FRONT_LEFT = 1ULL << 12U,
TOP_FRONT_CENTER = 1ULL << 13U,
TOP_FRONT_RIGHT = 1ULL << 14U,
TOP_BACK_LEFT = 1ULL << 15U,
TOP_BACK_CENTER = 1ULL << 16U,
TOP_BACK_RIGHT = 1ULL << 17U,
STEREO_LEFT = 1ULL << 29U,
STEREO_RIGHT = 1ULL << 30U,
WIDE_LEFT = 1ULL << 31U,
WIDE_RIGHT = 1ULL << 32U,
SURROUND_DIRECT_LEFT = 1ULL << 33U,
SURROUND_DIRECT_RIGHT = 1ULL << 34U,
LOW_FREQUENCY_2 = 1ULL << 35U,
TOP_SIDE_LEFT = 1ULL << 36U,
TOP_SIDE_RIGHT = 1ULL << 37U,
BOTTOM_FRONT_CENTER = 1ULL << 38U,
BOTTOM_FRONT_LEFT = 1ULL << 39U,
BOTTOM_FRONT_RIGHT = 1ULL << 40U,
AMBISONICS_ACN0 = 1ULL << 41U,
AMBISONICS_ACN1 = 1ULL << 42U,
AMBISONICS_ACN2 = 1ULL << 43U,
AMBISONICS_ACN3 = 1ULL << 44U,
AMBISONICS_W = AMBISONICS_ACN0,
AMBISONICS_Y = AMBISONICS_ACN1,
AMBISONICS_Z = AMBISONICS_ACN2,
AMBISONICS_X = AMBISONICS_ACN3,
AMBISONICS_ACN4 = 1ULL << 45U,
AMBISONICS_ACN5 = 1ULL << 46U,
AMBISONICS_ACN6 = 1ULL << 47U,
AMBISONICS_ACN7 = 1ULL << 48U,
AMBISONICS_ACN8 = 1ULL << 49U,
AMBISONICS_ACN9 = 1ULL << 50U,
AMBISONICS_ACN10 = 1ULL << 51U,
AMBISONICS_ACN11 = 1ULL << 52U,
AMBISONICS_ACN12 = 1ULL << 53U,
AMBISONICS_ACN13 = 1ULL << 54U,
AMBISONICS_ACN14 = 1ULL << 55U,
AMBISONICS_ACN15 = 1ULL << 56U}

Enumerates the audio channel numbers. Each channel number is mapped to a variable of int64.

AudioChannelLayout : uint64_t {
UNKNOWN_CHANNEL_LAYOUT = 0,
MONO = (AudioChannelSet::FRONT_CENTER),
STEREO = (AudioChannelSet::FRONT_LEFT |AudioChannelSet::FRONT_RIGHT),
CH_2POINT1 = (STEREO |AudioChannelSet::LOW_FREQUENCY),
CH_2_1 = (STEREO |AudioChannelSet::BACK_CENTER),
SURROUND = (STEREO |AudioChannelSet::FRONT_CENTER),
CH_3POINT1 = (SURROUND |AudioChannelSet::LOW_FREQUENCY),
CH_4POINT0 = (SURROUND |AudioChannelSet::BACK_CENTER),
CH_4POINT1 = (CH_4POINT0 |AudioChannelSet::LOW_FREQUENCY),
CH_2_2 = (STEREO |AudioChannelSet::SIDE_LEFT |AudioChannelSet::SIDE_RIGHT),
QUAD = (STEREO |AudioChannelSet::BACK_LEFT |AudioChannelSet::BACK_RIGHT),
CH_5POINT0 = (SURROUND |AudioChannelSet::SIDE_LEFT |AudioChannelSet::SIDE_RIGHT),
CH_5POINT1 = (CH_5POINT0 |AudioChannelSet::LOW_FREQUENCY),
CH_5POINT0_BACK = (SURROUND |AudioChannelSet::BACK_LEFT |AudioChannelSet::BACK_RIGHT),
CH_5POINT1_BACK = (CH_5POINT0_BACK |AudioChannelSet::LOW_FREQUENCY),
CH_6POINT0 = (CH_5POINT0 |AudioChannelSet::BACK_CENTER),
CH_6POINT0_FRONT = (CH_2_2 |AudioChannelSet::FRONT_LEFT_OF_CENTER |AudioChannelSet::FRONT_RIGHT_OF_CENTER),
HEXAGONAL = (CH_5POINT0_BACK |AudioChannelSet::BACK_CENTER),
CH_6POINT1 = (CH_5POINT1 |AudioChannelSet::BACK_CENTER),
CH_6POINT1_BACK = (CH_5POINT1_BACK |AudioChannelSet::BACK_CENTER),
CH_6POINT1_FRONT = (CH_6POINT0_FRONT |AudioChannelSet::LOW_FREQUENCY),
CH_7POINT0 = (CH_5POINT0 |AudioChannelSet::BACK_LEFT |AudioChannelSet::BACK_RIGHT),
CH_7POINT0_FRONT = (CH_5POINT0 |AudioChannelSet::FRONT_LEFT_OF_CENTER |AudioChannelSet::FRONT_RIGHT_OF_CENTER),
CH_7POINT1 = (CH_5POINT1 |AudioChannelSet::BACK_LEFT |AudioChannelSet::BACK_RIGHT),
CH_7POINT1_WIDE = (CH_5POINT1 |AudioChannelSet::FRONT_LEFT_OF_CENTER |AudioChannelSet::FRONT_RIGHT_OF_CENTER),
CH_7POINT1_WIDE_BACK,
CH_3POINT1POINT2 = (CH_3POINT1 |AudioChannelSet::TOP_FRONT_LEFT |AudioChannelSet::TOP_FRONT_RIGHT),
CH_5POINT1POINT2 = (CH_5POINT1 |AudioChannelSet::TOP_SIDE_LEFT |AudioChannelSet::TOP_SIDE_RIGHT),
CH_5POINT1POINT4,
CH_7POINT1POINT2 = (CH_7POINT1 |AudioChannelSet::TOP_SIDE_LEFT |AudioChannelSet::TOP_SIDE_RIGHT),
CH_7POINT1POINT4,
CH_9POINT1POINT4 = (CH_7POINT1POINT4 |AudioChannelSet::WIDE_LEFT |AudioChannelSet::WIDE_RIGHT),
CH_9POINT1POINT6 = (CH_9POINT1POINT4 |AudioChannelSet::TOP_SIDE_LEFT |AudioChannelSet::TOP_SIDE_RIGHT),
CH_10POINT2,
CH_22POINT2,
OCTAGONAL = (CH_5POINT0 |AudioChannelSet::BACK_LEFT |AudioChannelSet::BACK_CENTER |AudioChannelSet::BACK_RIGHT),
HEXADECAGONAL,
STEREO_DOWNMIX = (AudioChannelSet::STEREO_LEFT |AudioChannelSet::STEREO_RIGHT),
HOA_FIRST,
HOA_SECOND
HOA_THIRD}

Enumerates the types of the audio channel numbers. The output format of the decoder is represented as the channel type of the codec.

Functions

Name	Description
OH_AudioDecoder_CreateByMime (const char mime)	Creates an audio decoder instance based on a Multipurpose Internet Mail Extension (MIME) type. This function is recommended in most cases.
OH_AudioDecoder_CreateByName (const char name)	Creates an audio decoder instance based on a decoder name. To use this function, you must know the exact name of the decoder.
OH_AudioDecoder_Destroy (OH_AVCodec *codec)	Clears the internal resources of an audio decoder and destroys the decoder instance.
OH_AudioDecoder_SetCallback (OH_AVCodec codec, OH_AVCodecAsyncCallback callback, void userData)	Sets an asynchronous callback so that your application can respond to events generated by an audio decoder.
OH_AudioDecoder_Configure (OH_AVCodec codec, OH_AVFormat format)	Configures an audio decoder. Typically, you need to configure the audio description information that can be extracted from the container.
OH_AudioDecoder_Prepare (OH_AVCodec *codec)	Prepares internal resources for an audio decoder. This function must be called after Configure.
OH_AudioDecoder_Start (OH_AVCodec *codec)	Starts an audio decoder. This function can be called only after the decoder is prepared successfully.
OH_AudioDecoder_Stop (OH_AVCodec *codec)	Stops an audio decoder.
OH_AudioDecoder_Flush (OH_AVCodec *codec)	Clears the input and output data in the internal buffer of an audio decoder.
OH_AudioDecoder_Reset (OH_AVCodec *codec)	Resets an audio decoder. To continue decoding, you must call Configure to configure the decoder again.
OH_AudioDecoder_GetOutputDescription (OH_AVCodec codec)	Obtains the description information about the output data of an audio decoder. For details, see OH_AVFormat.
OH_AudioDecoder_SetParameter (OH_AVCodec codec, OH_AVFormat format)	Sets dynamic parameters for an audio decoder. This function can be called only after the decoder is started. Incorrect parameter settings may cause decoding failure.
OH_AudioDecoder_PushInputData (OH_AVCodec *codec, uint32_t index, OH_AVCodecBufferAttr attr)	Pushes the input buffer filled with data to an audio decoder.
OH_AudioDecoder_FreeOutputData (OH_AVCodec *codec, uint32_t index)	Frees an output buffer of an audio decoder.
OH_AudioDecoder_IsValid (OH_AVCodec codec, bool isValid)	Checks whether an audio decoder instance is valid.

Enum Description

AudioChannelLayout

enum AudioChannelLayout : uint64_t

Description

Enumerates the types of the audio channel numbers. The output format of the decoder is represented as the channel type of the codec.

\@syscap SystemCapability.Multimedia.Media.CodecBase

Since

AudioChannelSet

enum AudioChannelSet : uint64_t

Description

Enumerates the audio channel numbers. Each channel number is mapped to a variable of int64.

\@syscap SystemCapability.Multimedia.Media.CodecBase

Since

Value	Description
AMBISONICS_ACN1	Channel 0 for the zero-order stereo.
AMBISONICS_ACN2	Channel 1 for the first-order stereo.
AMBISONICS_ACN3	Channel 2 for the first-order stereo.
AMBISONICS_W	Channel 3 for the first-order stereo.
AMBISONICS_Y	Equivalent to channel 0 for the zero-order stereo.
AMBISONICS_Z	Equivalent to channel 1 for the first-order stereo.
AMBISONICS_X	Equivalent to channel 2 for the first-order stereo.
AMBISONICS_ACN4	Equivalent to channel 3 for the first-order stereo.
AMBISONICS_ACN5	Channel 4 for the second-order stereo.
AMBISONICS_ACN6	Channel 5 for the second-order stereo.
AMBISONICS_ACN7	Channel 6 for the second-order stereo.
AMBISONICS_ACN8	Channel 7 for the second-order stereo.
AMBISONICS_ACN9	Channel 8 for the second-order stereo.
AMBISONICS_ACN10	Channel 9 for the third-order stereo.
AMBISONICS_ACN11	Channel 10 for the third-order stereo.
AMBISONICS_ACN12	Channel 11 for the third-order stereo.
AMBISONICS_ACN13	Channel 12 for the third-order stereo.
AMBISONICS_ACN14	Channel 13 for the third-order stereo.
AMBISONICS_ACN15	Channel 14 for the third-order stereo.

Function Description

OH_AudioDecoder_Configure()

OH_AVErrCode OH_AudioDecoder_Configure (OH_AVCodec * codec, OH_AVFormat * format )

Description

Configures an audio decoder. Typically, you need to configure the audio description information that can be extracted from the container.

This function must be called prior to Prepare.

\@syscap SystemCapability.Multimedia.Media.AudioDecoder

Parameters

Name	Description
codec	Pointer to an OH_AVCodec instance.
format	Pointer to the OH_AVFormat instance, which provides the description information about the audio track to be decoded.

Returns

Returns AV_ERR_OK if the operation is successful; returns an error code defined in OH_AVErrCode otherwise.

Since

OH_AudioDecoder_CreateByMime()

OH_AVCodec* OH_AudioDecoder_CreateByMime (const char * mime)

Description

Creates an audio decoder instance based on a MIME type. This function is recommended in most cases.

\@syscap SystemCapability.Multimedia.Media.AudioDecoder

Parameters

Name	Description
mime	Pointer to a string that describes the MIME type. For details, see AVCODEC_MIMETYPE.

Returns

Returns the pointer to an OH_AVCodec instance.

Since

OH_AudioDecoder_CreateByName()

OH_AVCodec* OH_AudioDecoder_CreateByName (const char * name)

Description

Creates an audio decoder instance based on a decoder name. To use this function, you must know the exact name of the decoder.

\@syscap SystemCapability.Multimedia.Media.AudioDecoder

Parameters

Name	Description
name	Pointer to an audio decoder name.

Returns

Returns the pointer to an OH_AVCodec instance.

Since

OH_AudioDecoder_Destroy()

OH_AVErrCode OH_AudioDecoder_Destroy (OH_AVCodec * codec)

Description

Clears the internal resources of an audio decoder and destroys the decoder instance.

\@syscap SystemCapability.Multimedia.Media.AudioDecoder

Parameters

Name	Description
codec	Pointer to an OH_AVCodec instance.

Returns

Returns AV_ERR_OK if the operation is successful; returns an error code defined in OH_AVErrCode otherwise.

Since

OH_AudioDecoder_Flush()

OH_AVErrCode OH_AudioDecoder_Flush (OH_AVCodec * codec)

Description

Clears the input and output data in the internal buffer of an audio decoder.

This function invalidates the indexes of all buffers previously reported through the asynchronous callback. Therefore, before calling this function, ensure that the buffers with the specified indexes are no longer required.

\@syscap SystemCapability.Multimedia.Media.AudioDecoder

Parameters

Name	Description
codec	Pointer to an OH_AVCodec instance.

Returns

Returns AV_ERR_OK if the operation is successful; returns an error code defined in OH_AVErrCode otherwise.

Since

OH_AudioDecoder_FreeOutputData()

OH_AVErrCode OH_AudioDecoder_FreeOutputData (OH_AVCodec * codec, uint32_t index )

Description

Frees an output buffer of an audio decoder.

\@syscap SystemCapability.Multimedia.Media.AudioDecoder

Parameters

Name	Description
codec	Pointer to an OH_AVCodec instance.
index	Index of the output buffer.

Returns

Returns AV_ERR_OK if the operation is successful; returns an error code defined in OH_AVErrCode otherwise.

Since

OH_AudioDecoder_GetOutputDescription()

OH_AVFormat* OH_AudioDecoder_GetOutputDescription (OH_AVCodec * codec)

Description

Obtains the description information about the output data of an audio decoder. For details, see OH_AVFormat. The caller must manually release the OH_AVFormat instance in the return value.

\@syscap SystemCapability.Multimedia.Media.AudioDecoder

Parameters

Name	Description
codec	Pointer to an OH_AVCodec instance.

Returns

Returns the handle to an OH_AVFormat instance. The lifecycle of this instance is refreshed when GetOutputDescription is called again and destroyed when the OH_AVCodec instance is destroyed.

Since

OH_AudioDecoder_IsValid()

OH_AVErrCode OH_AudioDecoder_IsValid (OH_AVCodec * codec, bool * isValid )

Description

Checks whether an audio decoder instance is valid.

\@syscap SystemCapability.Multimedia.Media.AudioDecoder

Parameters

Name	Description
codec	Pointer to an OH_AVCodec instance.
isValid	Pointer to an instance of the Boolean type. The value true means that the decoder instance is valid and false means the opposite.

Returns

Returns AV_ERR_OK if the operation is successful; returns an error code defined in OH_AVErrCode otherwise.

Since

OH_AudioDecoder_Prepare()

OH_AVErrCode OH_AudioDecoder_Prepare (OH_AVCodec * codec)

Description

Prepares internal resources for an audio decoder. This function must be called after Configure.

\@syscap SystemCapability.Multimedia.Media.AudioDecoder

Parameters

Name	Description
codec	Pointer to an OH_AVCodec instance.

Returns

Returns AV_ERR_OK if the operation is successful; returns an error code defined in OH_AVErrCode otherwise.

Since

OH_AudioDecoder_PushInputData()

OH_AVErrCode OH_AudioDecoder_PushInputData (OH_AVCodec * codec, uint32_t index, OH_AVCodecBufferAttr attr )

Description

Pushes the input buffer filled with data to an audio decoder.

The OH_AVCodecOnNeedInputData callback reports the available input buffer and the index. After being pushed to the decoder, a buffer is not accessible until the buffer with the same index is reported again through the OH_AVCodecOnNeedInputData callback. In addition, some decoders require the input of specific data to initialize the decoding process.

\@syscap SystemCapability.Multimedia.Media.AudioDecoder

Parameters

Name	Description
codec	Pointer to an OH_AVCodec instance.
index	Index of the input buffer.
attr	Description information about the data in the buffer.

Returns

Returns AV_ERR_OK if the operation is successful; returns an error code defined in OH_AVErrCode otherwise.

Since

OH_AudioDecoder_Reset()

OH_AVErrCode OH_AudioDecoder_Reset (OH_AVCodec * codec)

Description

Resets an audio decoder. To continue decoding, you must call Configure to configure the decoder again.

\@syscap SystemCapability.Multimedia.Media.AudioDecoder

Parameters

Name	Description
codec	Pointer to an OH_AVCodec instance.

Returns

Returns AV_ERR_OK if the operation is successful; returns an error code defined in OH_AVErrCode otherwise.

Since

OH_AudioDecoder_SetCallback()

OH_AVErrCode OH_AudioDecoder_SetCallback (OH_AVCodec * codec, OH_AVCodecAsyncCallback callback, void * userData )

Description

Sets an asynchronous callback so that your application can respond to events generated by an audio decoder.

This function must be called prior to Prepare.

\@syscap SystemCapability.Multimedia.Media.AudioDecoder

Parameters

Name	Description
codec	Pointer to an OH_AVCodec instance.
callback	Callback function to set. For details, see OH_AVCodecAsyncCallback.
userData	User-specific data.

Returns

Returns AV_ERR_OK if the operation is successful; returns an error code defined in OH_AVErrCode otherwise.

Since

OH_AudioDecoder_SetParameter()

OH_AVErrCode OH_AudioDecoder_SetParameter (OH_AVCodec * codec, OH_AVFormat * format )

Description

Sets dynamic parameters for an audio decoder.

This function can be called only after the decoder is started. Incorrect parameter settings may cause decoding failure.

\@syscap SystemCapability.Multimedia.Media.AudioDecoder

Parameters

Name	Description
codec	Pointer to an OH_AVCodec instance.
format	Handle to an OH_AVFormat instance.

Returns

Returns AV_ERR_OK if the operation is successful; returns an error code defined in OH_AVErrCode otherwise.

Since

OH_AudioDecoder_Start()

OH_AVErrCode OH_AudioDecoder_Start (OH_AVCodec * codec)

Description

Starts an audio decoder. This function can be called only after the decoder is prepared successfully.

After being started, the decoder starts to report the OH_AVCodecOnNeedInputData event.

\@syscap SystemCapability.Multimedia.Media.AudioDecoder

Parameters

Name	Description
codec	Pointer to an OH_AVCodec instance.

Returns

Returns AV_ERR_OK if the operation is successful; returns an error code defined in OH_AVErrCode otherwise.

Since

OH_AudioDecoder_Stop()

OH_AVErrCode OH_AudioDecoder_Stop (OH_AVCodec * codec)

Description

Stops an audio decoder.

After the decoder is stopped, you can call Start to start it again. If you have passed specific data in the previous Start for the decoder, you must pass it again.

\@syscap SystemCapability.Multimedia.Media.AudioDecoder

Parameters