harmony 鸿蒙VideoEncoder
VideoEncoder
Overview
The VideoEncoder module provides the functions for video encoding.
\@syscap SystemCapability.Multimedia.Avcodec.VideoEncoder
Since
9
Summary
Files
| Name | Description |
|---|---|
| native_avcodec_videoencoder.h | Declares the native APIs used for video encoding. File to include: Library: libnative_media_venc.so |
Types
| Name | Description |
|---|---|
| OH_VideoEncodeBitrateMode | Defines an enum that enumerates the bit rate modes of a video encoder. |
Enums
| Name | Description |
|---|---|
| OH_VideoEncodeBitrateMode { CBR = 0, VBR = 1, CQ = 2 } |
Enumerates the bit rate modes of a video encoder. |
Functions
| Name | Description |
|---|---|
| *OH_VideoEncoder_CreateByMime (const char *mime) | Creates a video encoder instance based on a Multipurpose Internet Mail Extension (MIME) type. This function is recommended in most cases. |
| *OH_VideoEncoder_CreateByName (const char *name) | Creates a video encoder instance based on an encoder name. To use this function, you must know the exact name of the encoder. |
| OH_VideoEncoder_Destroy (OH_AVCodec *codec) | Clears the internal resources of a video encoder and destroys the encoder instance. |
| OH_VideoEncoder_SetCallback (OH_AVCodec *codec, OH_AVCodecAsyncCallback callback, void *userData) | Sets an asynchronous callback so that your application can respond to events generated by a video encoder. |
| OH_VideoEncoder_Configure (OH_AVCodec *codec, OH_AVFormat *format) | Configures a video encoder. Typically, you need to configure the description information about the video track to be encoded. |
| OH_VideoEncoder_Prepare (OH_AVCodec *codec) | Prepares internal resources for a video encoder. This function must be called after Configure. |
| OH_VideoEncoder_Start (OH_AVCodec *codec) | Starts a video encoder. This function can be called only after the encoder is prepared successfully. |
| OH_VideoEncoder_Stop (OH_AVCodec *codec) | Stops a video encoder. |
| OH_VideoEncoder_Flush (OH_AVCodec *codec) | Clears the input and output data in the internal buffer of a video encoder. |
| OH_VideoEncoder_Reset (OH_AVCodec *codec) | Resets a video encoder. |
| *OH_VideoEncoder_GetOutputDescription (OH_AVCodec *codec) | Obtains the description information about the output data of a video encoder. For details, see OH_AVFormat . |
| OH_VideoEncoder_SetParameter (OH_AVCodec *codec, OH_AVFormat *format) | Sets dynamic parameters for a video encoder. |
| OH_VideoEncoder_GetSurface (OH_AVCodec *codec, OHNativeWindow **window) | Sets an input surface for a video encoder. This function must be called prior to Prepare. |
| OH_VideoEncoder_FreeOutputData (OH_AVCodec *codec, uint32_t index) | Frees an output buffer of a video encoder. |
| OH_VideoEncoder_NotifyEndOfStream (OH_AVCodec *codec) | Notifies a video encoder that input streams end. You are advised to use this function for notification. |
| OH_VideoEncoder_PushInputData (OH_AVCodec *codec, uint32_t index, OH_AVCodecBufferAttr attr) | Pushes the input buffer filled with data to a video encoder. |
| *OH_VideoEncoder_GetInputDescription (OH_AVCodec *codec) | Obtains the description information received by the video encoder. This function must be called after Configure. For details, see OH_AVFormat. |
| OH_VideoEncoder_IsValid (OH_AVCodec *codec, bool *isValid) | Checks whether a video encoder instance is valid. |
Type Description
OH_VideoEncodeBitrateMode
typedef enum OH_VideoEncodeBitrateMode OH_VideoEncodeBitrateMode
Description
Defines the bit rate mode of a video encoder.
\@syscap SystemCapability.Multimedia.Media.VideoEncoder
Since
9
Enum Description
OH_VideoEncodeBitrateMode
enum OH_VideoEncodeBitrateMode
Description
Enumerates the bit rate modes of a video encoder.
\@syscap SystemCapability.Multimedia.Media.VideoEncoder
Since
9
| Value | Description |
|---|---|
| CBR | Constant bit rate. |
| VBR | Variable bit rate. |
| CQ | Constant quality. |
Function Description
OH_VideoEncoder_Configure()
OH_AVErrCode OH_VideoEncoder_Configure (OH_AVCodec *codec, OH_AVFormat *format)
Description
Configures a video encoder. Typically, you need to configure the description information about the video track to be encoded.
This function must be called prior to Prepare.
\@syscap SystemCapability.Multimedia.Media.VideoEncoder
Parameters
| Name | Description |
|---|---|
| codec | Pointer to an OH_AVCodec instance. |
| format | Pointer to an OH_AVFormat instance, which provides the description information about the video track to be encoded. |
Returns
Returns AV_ERR_OK if the operation is successful; returns an error code defined in OH_AVErrCode otherwise.
Since
9
OH_VideoEncoder_CreateByMime()
OH_AVCodec* OH_VideoEncoder_CreateByMime (const char *mime)
Description
Creates a video encoder instance based on a MIME type. This function is recommended in most cases.
\@syscap SystemCapability.Multimedia.Media.VideoEncoder
Parameters
| Name | Description |
|---|---|
| mime | Pointer to a string that describes the MIME type. For details, see AVCODEC_MIMETYPE. |
Returns
Returns the pointer to the OH_AVCodec instance created. You must call OH_VideoEncoder_Destroy to destroy the instance when it is no longer needed.
Since
9
OH_VideoEncoder_CreateByName()
OH_AVCodec* OH_VideoEncoder_CreateByName (const char *name)
Description
Creates a video encoder instance based on an encoder name. To use this function, you must know the exact name of the encoder.
\@syscap SystemCapability.Multimedia.Media.VideoEncoder
Parameters
| Name | Description |
|---|---|
| name | Pointer to a video encoder name. |
Returns
Returns the pointer to an OH_AVCodec instance.
Since
9
OH_VideoEncoder_Destroy()
OH_AVErrCode OH_VideoEncoder_Destroy (OH_AVCodec *codec)
Description
Clears the internal resources of a video encoder and destroys the encoder instance.
\@syscap SystemCapability.Multimedia.Media.VideoEncoder
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
9
OH_VideoEncoder_Flush()
OH_AVErrCode OH_VideoEncoder_Flush (OH_AVCodec *codec)
Description
Clears the input and output data in the internal buffer of a video encoder.
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.VideoEncoder
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
9
OH_VideoEncoder_FreeOutputData()
OH_AVErrCode OH_VideoEncoder_FreeOutputData (OH_AVCodec *codec, uint32_t index)
Description
Frees an output buffer of a video encoder.
\@syscap SystemCapability.Multimedia.Media.VideoEncoder
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
9
OH_VideoEncoder_GetInputDescription()
OH_AVFormat* OH_VideoEncoder_GetInputDescription (OH_AVCodec *codec)
Description
Obtains the description information received by the video encoder. This function must be called after Configure. For details, see OH_AVFormat.
The caller must manually release the OH_AVFormat instance in the return value.
\@syscap SystemCapability.Multimedia.Media.VideoEncoder
Parameters
| Name | Description |
|---|---|
| codec | Pointer to an OH_AVCodec instance. |
Returns
Returns the pointer to an OH_AVFormat instance.
Since
10
OH_VideoEncoder_GetOutputDescription()
OH_AVFormat* OH_VideoEncoder_GetOutputDescription (OH_AVCodec *codec)
Description
Obtains the description information about the output data of a video encoder. For details, see OH_AVFormat.
The caller must manually release the OH_AVFormat instance in the return value.
\@syscap SystemCapability.Multimedia.Media.VideoEncoder
Parameters
| Name | Description |
|---|---|
| codec | Pointer to an OH_AVCodec instance. |
Returns
Returns the pointer to an OH_AVFormat instance.
Since
9
OH_VideoEncoder_GetSurface()
OH_AVErrCode OH_VideoEncoder_GetSurface (OH_AVCodec *codec, OHNativeWindow **window)
Description
Sets an input surface for a video encoder. This function must be called prior to Prepare.
The application manages the lifecycle of the window and calls OH_NativeWindow_DestroyNativeWindow() to release the window when the lifecycle ends.
\@syscap SystemCapability.Multimedia.Media.VideoEncoder
Parameters
| Name | Description |
|---|---|
| codec | Pointer to an OH_AVCodec instance. |
| window | Pointer to an OHNativeWindow instance. For details, see OHNativeWindow. |
Returns
Returns AV_ERR_OK if the operation is successful; returns an error code defined in OH_AVErrCode otherwise.
Since
9
OH_VideoEncoder_IsValid()
OH_AVErrCode OH_VideoEncoder_IsValid (OH_AVCodec *codec, bool *isValid)
Description
Checks whether a video encoder instance is valid.
\@syscap SystemCapability.Multimedia.Media.VideoEncoder
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 encoder 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
10
OH_VideoEncoder_NotifyEndOfStream()
OH_AVErrCode OH_VideoEncoder_NotifyEndOfStream (OH_AVCodec *codec)
Description
Notifies a video encoder that input streams end. You are advised to use this function for notification.
This function is recommended in surface mode.
\@syscap SystemCapability.Multimedia.Media.VideoEncoder
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
9
OH_VideoEncoder_Prepare()
OH_AVErrCode OH_VideoEncoder_Prepare (OH_AVCodec *codec)
Description
Prepares internal resources for a video encoder. This function must be called after Configure.
\@syscap SystemCapability.Multimedia.Media.VideoEncoder
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
9
OH_VideoEncoder_PushInputData()
OH_AVErrCode OH_VideoEncoder_PushInputData (OH_AVCodec *codec, uint32_t index, OH_AVCodecBufferAttr attr)
Description
Pushes the input buffer filled with data to a video encoder.
\@syscap SystemCapability.Multimedia.Media.VideoEncoder
Parameters
| Name | Description |
|---|---|
| codec | Pointer to an OH_AVCodec instance. |
| index | Index of the input buffer. |
| attr | Description of the data contained in the buffer. |
Returns
Returns AV_ERR_OK if the operation is successful; returns an error code defined in OH_AVErrCode otherwise.
Since
10
OH_VideoEncoder_Reset()
OH_AVErrCode OH_VideoEncoder_Reset (OH_AVCodec *codec)
Description
Resets a video encoder. To continue encoding, you must call Configure to configure the encoder again.
\@syscap SystemCapability.Multimedia.Media.VideoEncoder
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
9
OH_VideoEncoder_SetCallback()
OH_AVErrCode OH_VideoEncoder_SetCallback (OH_AVCodec *codec, OH_AVCodecAsyncCallback callback, void *userData)
Description
Sets an asynchronous callback so that your application can respond to events generated by a video encoder.
This function must be called prior to Prepare.
\@syscap SystemCapability.Multimedia.Media.VideoEncoder
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
9
OH_VideoEncoder_SetParameter()
OH_AVErrCode OH_VideoEncoder_SetParameter (OH_AVCodec *codec, OH_AVFormat *format)
Description
Sets dynamic parameters for a video encoder.
This function can be called only after the encoder is started. Incorrect parameter settings may cause encoding failure.
\@syscap SystemCapability.Multimedia.Media.VideoEncoder
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
9
OH_VideoEncoder_Start()
OH_AVErrCode OH_VideoEncoder_Start (OH_AVCodec *codec)
Description
Starts a video encoder. This function can be called only after the encoder is prepared successfully.
After being started, the encoder starts to report the NeedInputData event.
\@syscap SystemCapability.Multimedia.Media.VideoEncoder
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
9
OH_VideoEncoder_Stop()
OH_AVErrCode OH_VideoEncoder_Stop (OH_AVCodec *codec)
Description
Stops a video encoder. After the encoder is stopped, you can call Start to start it again.
\@syscap SystemCapability.Multimedia.Media.VideoEncoder
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
9
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