README.MD

FFmpeg-QuQi-Analyzer

使用示例：

Example位于doc_quqi目录下

cd doc_quqi
bash build.sh
cd build
./main ../veilside.h264

---

LICENSE:

• LICENSE(1) "Anti 996" License Version 1.0 (Draft)
• LICENSE(2)

---

Pre

AVCodecContext *avctx = ... ;

1. 获取QP数据:

// analyzer open 开启分析器 （必须）
avctx->cyl_analyzer_state_switch(avctx,1);

...etc

// decode
int ret = avcodec_receive_frame(avctx, v_frame);

... etc

CYLCodecAnalyzerLinkListNode *ptr = v_frame->cyl_analyzer_head;

while (ptr != NULL) {
    if (ptr->mb_index >= 0) {
        // Debug print Macro Index And QP
        printf("%d-%hhu | ",ptr->mb_index,ptr->qp_item);
    }

    if (ptr->next == NULL) {
        printf("break\n");
        break;
    }
    ptr = ptr->next;
}
ptr = NULL;
printf("\n");

2. 获取宏块类型

// analyzer open 开启分析器 （必须）
avctx->cyl_analyzer_state_switch(avctx,1);

...etc

// decode
int ret = avcodec_receive_frame(avctx, v_frame);

... etc

CYLCodecAnalyzerLinkListNode *ptr = v_frame->cyl_analyzer_head;

while (ptr != NULL) {
    if (ptr->mb_index >= 0) {
        // Debug print Macro Index And Macro Block Type
        printf("%d-%hhu-%s | ",ptr->mb_index,ptr->mb_item_type,ptr->mb_desc);
    }

    if (ptr->next == NULL) {
        printf("break\n");
        break;
    }
    ptr = ptr->next;
}
ptr = NULL;
printf("\n");

3. 判断宏块类型 (Macro Type)

include : libavcodec/cyl2analyzer.h

(1) Func

@Param CYLCodecAnalyzerLinkListNode->mb_item_type
@return bool

IS_INTRA4x4(a)
IS_INTRA16x16(a)
IS_PCM(a)
IS_INTRA(a)
IS_INTER(a)
IS_SKIP(a)
IS_INTRA_PCM(a)
IS_INTERLACED(a)
IS_DIRECT(a)
IS_GMC(a)
IS_16X16(a)
IS_16X8(a)
IS_8X16(a)
IS_8X8(a)
IS_SUB_8X8(a)
IS_SUB_8X4(a)
IS_SUB_4X8(a)
IS_SUB_4X4(a)
IS_ACPRED(a)
IS_QUANT(a)

(2) OR strcmp

CYL_ANALYZE_MB_TYPE_IS_INTRA4x4
CYL_ANALYZE_MB_TYPE_IS_INTRA16x16
CYL_ANALYZE_MB_TYPE_IS_PCM
CYL_ANALYZE_MB_TYPE_IS_INTRA
CYL_ANALYZE_MB_TYPE_IS_INTER
CYL_ANALYZE_MB_TYPE_IS_SKIP
CYL_ANALYZE_MB_TYPE_IS_INTRA_PCM
CYL_ANALYZE_MB_TYPE_IS_INTERLACED CYL_ANALYZE_MB_TYPE_IS_DIRECT
CYL_ANALYZE_MB_TYPE_IS_GMC
CYL_ANALYZE_MB_TYPE_IS_16X16
CYL_ANALYZE_MB_TYPE_IS_16X8
CYL_ANALYZE_MB_TYPE_IS_8X16
CYL_ANALYZE_MB_TYPE_IS_8X8
CYL_ANALYZE_MB_TYPE_IS_SUB_8X8
CYL_ANALYZE_MB_TYPE_IS_SUB_8X4
CYL_ANALYZE_MB_TYPE_IS_SUB_4X8
CYL_ANALYZE_MB_TYPE_IS_SUB_4X4
CYL_ANALYZE_MB_TYPE_IS_ACPRED
CYL_ANALYZE_MB_TYPE_IS_QUANT
CYL_ANALYZE_MB_TYPE_UnKnow

• Code

#include <libavcodec/cyl2analyzer.h>

...etc

// (1)
if (IS_INTER(ptr->mb_item_type)) {
    etc...
}

// (2)
if (strcmp(ptr->mb_desc , CYL_ANALYZE_MB_TYPE_IS_INTER)) {
    etc...
}

4. 获取运动矢量 (Motion Vector)

优化

• 获取MV性能提升87%

AVDictionary *options = NULL;
av_dict_set(&options, "flags2", "+export_mvs", 0);

avcodec_open2(rtspVideoCodecContext, rtspVideoCodec, &options);

... etc

while (avcodec_receive_frame(rtspVideoCodecContext, v_frame) == 0) {
    ...etc

    AVFrameSideData *sd;
sd = av_frame_get_side_data(v_frame, AV_FRAME_DATA_MOTION_VECTORS);
    ...etc

    if (sd) {
        clear_mv_data();
        const AVMotionVector *mvs = (const AVMotionVector *)sd->data;
        for (i = 0; i < sd->size / sizeof(*mvs); i++) {
            const AVMotionVector *mv = &mvs[i];
            /*
                 mv->src_x, mv->src_y,
                 mv->dst_x, mv->dst_y
             */
        }
    }
   
}

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