harmony 鸿蒙VideoDecoder
VideoDecoder
Overview
The VideoDecoder module provides the functions for video decoding.
\@syscap SystemCapability.Multimedia.Media.VideoDecoder
Since
9
Summary
Files
| Name | Description |
|---|---|
| native_avcodec_videodecoder.h | Declares the native APIs used for video decoding. File to include: Library: libnative_media_vdec.so |
Functions
| Name | Description |
|---|---|
| *OH_VideoDecoder_CreateByMime (const char *mime) | Creates a video decoder instance based on a Multipurpose Internet Mail Extension (MIME) type. This function is recommended in most cases. |
| *OH_VideoDecoder_CreateByName (const char *name) | Creates a video decoder instance based on a decoder name. To use this function, you must know the exact name of the decoder. |
| OH_VideoDecoder_Destroy (OH_AVCodec *codec) | Clears the internal resources of a video decoder and destroys the decoder instance. |
| OH_VideoDecoder_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 decoder. |
| OH_VideoDecoder_SetSurface (OH_AVCodec *codec, OHNativeWindow *window) | Sets an output surface for a video decoder. This function must be called prior to Prepare. |
| OH_VideoDecoder_Configure (OH_AVCodec *codec, OH_AVFormat *format) | Configures a video decoder. Typically, you need to configure the video track description information that can be extracted from the container. |
| OH_VideoDecoder_Prepare (OH_AVCodec *codec) | Prepares internal resources for a video decoder. This function must be called after Configure. |
| OH_VideoDecoder_Start (OH_AVCodec *codec) | Starts a video decoder. This function can be called only after the decoder is prepared successfully. |
| OH_VideoDecoder_Stop (OH_AVCodec *codec) | Stops a video decoder. |
| OH_VideoDecoder_Flush (OH_AVCodec *codec) | Clears the input and output data in the internal buffer of a video decoder. |
| OH_VideoDecoder_Reset (OH_AVCodec *codec) | Resets a video decoder. |
| *OH_VideoDecoder_GetOutputDescription (OH_AVCodec *codec) | Obtains the description information about the output data of a video decoder. |
| OH_VideoDecoder_SetParameter (OH_AVCodec *codec, OH_AVFormat *format) | Sets dynamic parameters for a video decoder. |
| OH_VideoDecoder_PushInputData (OH_AVCodec *codec, uint32_t index, OH_AVCodecBufferAttr attr) | Pushes the input buffer filled with data to a video decoder. |
| OH_VideoDecoder_RenderOutputData (OH_AVCodec *codec, uint32_t index) | Frees an output buffer of a video decoder and instructs the decoder to render the decoded data in the buffer on the output surface. |
| OH_VideoDecoder_FreeOutputData (OH_AVCodec *codec, uint32_t index) | Frees an output buffer of a video decoder. |
| OH_VideoDecoder_IsValid (OH_AVCodec *codec, bool *isValid) | Checks whether a video codec instance is valid. |
Function Description
OH_VideoDecoder_Configure()
OH_AVErrCode OH_VideoDecoder_Configure (OH_AVCodec *codec, OH_AVFormat *format)
Description
Configures a video decoder. Typically, you need to configure the video track description information that can be extracted from the container.
This function must be called prior to Prepare.
\@syscap SystemCapability.Multimedia.Media.VideoDecoder
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 decoded. |
Returns
Returns AV_ERR_OK if the operation is successful; returns an error code defined in OH_AVErrCode otherwise.
Since
9
OH_VideoDecoder_CreateByMime()
OH_AVCodec* OH_VideoDecoder_CreateByMime (const char *mime)
Description
Creates a video decoder instance based on a MIME type. This function is recommended in most cases.
\@syscap SystemCapability.Multimedia.Media.VideoDecoder
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
9
OH_VideoDecoder_CreateByName()
OH_AVCodec* OH_VideoDecoder_CreateByName (const char *name)
Description
Creates a video decoder instance based on a decoder name. To use this function, you must know the exact name of the decoder.
\@syscap SystemCapability.Multimedia.Media.VideoDecoder
Parameters
| Name | Description |
|---|---|
| name | Pointer to a video decoder name. |
Returns
Returns the pointer to an OH_AVCodec instance.
Since
9
OH_VideoDecoder_Destroy()
OH_AVErrCode OH_VideoDecoder_Destroy (OH_AVCodec *codec)
Description
Clears the internal resources of a video decoder and destroys the decoder instance.
\@syscap SystemCapability.Multimedia.Media.VideoDecoder
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_VideoDecoder_Flush()
OH_AVErrCode OH_VideoDecoder_Flush (OH_AVCodec *codec)
Description
Clears the input and output data in the internal buffer of a video 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.VideoDecoder
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_VideoDecoder_FreeOutputData()
OH_AVErrCode OH_VideoDecoder_FreeOutputData (OH_AVCodec *codec, uint32_t index)
Description
Frees an output buffer of a video decoder.
\@syscap SystemCapability.Multimedia.Media.VideoDecoder
Parameters
| Name | Description |
|---|---|
| codec | Pointer to an OH_AVCodec instance. |
| index | Index of an output buffer. |
Returns
Returns AV_ERR_OK if the operation is successful; returns an error code defined in OH_AVErrCode otherwise.
Since
9
OH_VideoDecoder_GetOutputDescription()
OH_AVFormat* OH_VideoDecoder_GetOutputDescription (OH_AVCodec *codec)
Description
Obtains the description information about the output data of a video decoder. For details, see OH_AVFormat.
The caller must manually release the OH_AVFormat instance in the return value.
\@syscap SystemCapability.Multimedia.Media.VideoDecoder
Parameters
| Name | Description |
|---|---|
| codec | Pointer to an OH_AVCodec instance. |
Returns
Returns the pointer to an OH_AVFormat instance.
Since
9
OH_VideoDecoder_IsValid()
OH_AVErrCode OH_VideoDecoder_IsValid (OH_AVCodec *codec, bool *isValid)
Description
Checks whether a video codec instance is valid.
\@syscap SystemCapability.Multimedia.Media.VideoDecoder
Parameters
| Name | Description |
|---|---|
| codec | Pointer to an OH_AVCodec instance. |
| isVaild | Output parameter. 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
10
OH_VideoDecoder_Prepare()
OH_AVErrCode OH_VideoDecoder_Prepare (OH_AVCodec *codec)
Description
Prepares internal resources for a video decoder. This function must be called after Configure.
\@syscap SystemCapability.Multimedia.Media.VideoDecoder
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_VideoDecoder_PushInputData()
OH_AVErrCode OH_VideoDecoder_PushInputData (OH_AVCodec *codec, uint32_t index, OH_AVCodecBufferAttr attr)
Description
Pushes the input buffer filled with data to a video 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 codec-specific data, such as PPS/SPS data in H.264 format, to initialize the decoding process.
\@syscap SystemCapability.Multimedia.Media.VideoDecoder
Parameters
| Name | Description |
|---|---|
| codec | Pointer to an OH_AVCodec instance. |
| index | Index of an 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
9
OH_VideoDecoder_RenderOutputData()
OH_AVErrCode OH_VideoDecoder_RenderOutputData (OH_AVCodec *codec, uint32_t index)
Description
Frees an output buffer of a video decoder and instructs the decoder to render the decoded data in the buffer on the output surface.
If no output surface is configured, calling this function only frees the output buffer.
\@syscap SystemCapability.Multimedia.Media.VideoDecoder
Parameters
| Name | Description |
|---|---|
| codec | Pointer to an OH_AVCodec instance. |
| index | Index of an output buffer. |
Returns
Returns AV_ERR_OK if the operation is successful; returns an error code defined in OH_AVErrCode otherwise.
Since
9
OH_VideoDecoder_Reset()
OH_AVErrCode OH_VideoDecoder_Reset (OH_AVCodec *codec)
Description
Resets a video decoder. To continue decoding, you must call Configure to configure the decoder again.
\@syscap SystemCapability.Multimedia.Media.VideoDecoder
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_VideoDecoder_SetCallback()
OH_AVErrCode OH_VideoDecoder_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 decoder.
This function must be called prior to Prepare.
\@syscap SystemCapability.Multimedia.Media.VideoDecoder
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_VideoDecoder_SetParameter()
OH_AVErrCode OH_VideoDecoder_SetParameter (OH_AVCodec *codec, OH_AVFormat *format)
Description
Sets dynamic parameters for a video decoder.
This function can be called only after the decoder is started. Incorrect parameter settings may cause decoding failure.
\@syscap SystemCapability.Multimedia.Media.VideoDecoder
Parameters
| Name | Description |
|---|---|
| codec | Pointer to an OH_AVCodec instance. |
| format | Pointer 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_VideoDecoder_SetSurface()
OH_AVErrCode OH_VideoDecoder_SetSurface (OH_AVCodec *codec, OHNativeWindow *window)
Description
Sets an output surface for a video decoder. This function must be called prior to Prepare.
\@syscap SystemCapability.Multimedia.Media.VideoDecoder
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_VideoDecoder_Start()
OH_AVErrCode OH_VideoDecoder_Start (OH_AVCodec *codec)
Description
Starts a video decoder. This function can be called only after the decoder is prepared successfully.
After being started, the decoder starts to report the NeedInputData event.
\@syscap SystemCapability.Multimedia.Media.VideoDecoder
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_VideoDecoder_Stop()
OH_AVErrCode OH_VideoDecoder_Stop (OH_AVCodec *codec)
Description
Stops a video decoder. After the encoder is stopped, you can call Start to start it again.
If you have passed codec-specific data in the previous Start for the decoder, you must pass it again.
\@syscap SystemCapability.Multimedia.Media.VideoDecoder
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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