hi_venc_jpeg_param

Function

Defines the quantization parameters of a JPEGE channel.

Definition

#define HI_VENC_JPEG_QT_COEF_NUM 64
typedef struct {
    hi_u32 qfactor;
    hi_u8 y_qt[HI_VENC_JPEG_QT_COEF_NUM];
    hi_u8 cb_qt[HI_VENC_JPEG_QT_COEF_NUM];
    hi_u8 cr_qt[HI_VENC_JPEG_QT_COEF_NUM];
    hi_u32 mcu_per_ecs;
    hi_bool ecs_output_en;
} hi_venc_jpeg_param;

For details about basic data types hi_u32, hi_u8, and hi_bool, see Basic Data Types.

Members

Member	Description
qfactor	Encoding quality factor. A smaller value indicates poorer image quality. Must be 0xFFFFFFFF or in the range of [1, 100]. Defaults to 100. If it is set to 0xFFFFFFFF, the user must also specify the y_qt, cb_qt, and cr_qt parameters. The QT configuration affects the encode result. If it is set to a value within [1, 100], the default values of y_qt, cb_qt, and cr_qt are used.
y_qt	Y quantization table. Value range: [1, 255]
cb_qt	Cb quantization table. Value range: [1, 255]
cr_qt	Cr quantization table. Value range: [1, 255]
mcu_per_ecs	(Reserved) MCU count per entropy coded segment (ECS). Defaults to 0, indicating an ECS is not partitioned into MCUs. Value range: [0, (picwidth + 15)>>4 × (picheight + 15)>>4 × 2]
ecs_output_en	Reserved parameter, not supported currently.

Parent topic: VENC/JPEGE