aclvencChannelDescParamType

enum aclvencChannelDescParamType {
    ACL_VENC_THREAD_ID_UINT64 = 0,      // Callback thread ID. Its value is of the uint64_t type.
    ACL_VENC_CALLBACK_PTR,              // Callback function. Its value is a memory pointer.
    ACL_VENC_PIXEL_FORMAT_UINT32,       // Input image format. Its value is of the uint32_t type.
    ACL_VENC_ENCODE_TYPE_UINT32,        // Video coding protocol. Its value is of the uint32_t type.
    ACL_VENC_PIC_WIDTH_UINT32,          // Input image width. Its value is of the uint32_t type.
    ACL_VENC_PIC_HEIGHT_UINT32,         // Input image height. Its value is of the uint32_t type.
    ACL_VENC_KEY_FRAME_INTERVAL_UINT32, // Key frame interval. Its value is of the uint32_t type.
    ACL_VENC_BUF_ADDR_PTR,              // Buffer address of the encode output.
    ACL_VENC_BUF_SIZE_UINT32,           // Buffer size of the encoding output. Its value is of the uint32_t type.
    ACL_VENC_RC_MODE_UINT32,            // Bit rate control mode. Its value is of the uint32_t type.
    ACL_VENC_SRC_RATE_UINT32,           // Frame rate of the input stream. Its value is of the uint32_t type.
    ACL_VENC_MAX_BITRATE_UINT32,        // Output bit rate. Its value is of the uint32_t type.
    ACL_VENC_MAX_IP_PROP_UINT32         // I-frame to P-frame bit allocation ratio within a GOP. Its value is of the uint32_t type.
}

**Table 1** Attribute settings
Attribute	Description
ACL_VENC_THREAD_ID_UINT64	Callback thread ID. Do not pass the same thread ID for subscribing to VENC callback functions on different devices in the same process.
ACL_VENC_CALLBACK_PTR	Encoding callback function.
ACL_VENC_PIXEL_FORMAT_UINT32	Image format. PIXEL_FORMAT_YUV_SEMIPLANAR_420 PIXEL_FORMAT_YVU_SEMIPLANAR_420
ACL_VENC_ENCODE_TYPE_UINT32	Video coding protocol. For details, see acldvppStreamFormat.
ACL_VENC_PIC_WIDTH_UINT32	Image width.
ACL_VENC_PIC_HEIGHT_UINT32	Image height.
ACL_VENC_KEY_FRAME_INTERVAL_UINT32	Key frame interval. Must be in the range of [1, 65536].
ACL_VENC_BUF_ADDR_PTR	Pointer to the buffer address of the encoding output.
ACL_VENC_BUF_SIZE_UINT32	Buffer allocation in bytes of the encoding output. In the current version, it is not supported to obtain this attribute. The value obtained is invalid.
ACL_VENC_RC_MODE_UINT32	Bit rate control mode. 0: default mode. 1: variable bit rate (VBR) mode 2: constant bit rate (CBR) mode
ACL_VENC_SRC_RATE_UINT32	Frame rate of the input stream (FPS). For the Ascend 610 AI Processor, the value is 0 or in the range of [1, 240]. For the Ascend 610 AI Processor, the value is 0 or in the range of [1, 240]. If it is not set, the default value 30 is used. If it is set to 0, the default value 30 is used. If the difference between the value of this parameter and the actual frame rate of the input stream is too large, the output bit rate is affected.
ACL_VENC_MAX_BITRATE_UINT32	Output bit rate (kbit/s). For the Ascend 610 AI Processor, the value range is [2, 614400]. The default value is 2000. If it is set to 0, the default value 2000 is used. For the Ascend 610 AI Processor, the value range is [2, 614400]. The default value is 2000. If it is set to 0, the default value 2000 is used.
ACL_VENC_MAX_IP_PROP_UINT32	I-frame to P-frame bit allocation ratio within a GOP. The value can be 0 or within the range of [1, 100]. The default value is 80 in VBR mode or 70 in CBR mode. If it is set to 0, the default value is used.

Parent topic: Data Types and Operation APIs