MPP-编码示例

了解MPP的基本功能后，接下来具体分析编码的代码。首先把编码的代码提取出来，方便以后的使用。

完整的编码代码如下，相比较给出的示例代码，做了一些改动，输入的指令全部去除，将函数入口改为利用OpenCV打开USB摄像头，调用编码函数编码，编码后的数据保存在本地。

  1 #if defined(_WIN32)
  2 #include "vld.h"
  3 #endif
  4 
  5 #define MODULE_TAG "mpi_enc_test"
  6 
  7 #include <string.h>
  8 #include 
  9 
 10 #include "utils.h"
 11 #include "rk_mpi.h"
 12 #include "mpp_env.h"
 13 #include "mpp_mem.h"
 14 #include "mpp_log.h"
 15 #include "mpp_time.h"
 16 #include "mpp_common.h"
 17 
 18 #include 
 19 #include 
 20 #include 
 21 
 22 using namespace std;
 23 using namespace cv;
 24 
 25 #define MAX_FILE_NAME_LENGTH 256
 26 #define calTimeCost(begin,end)(end.tv_sec*1000.-begin.tv_sec*1000.+end.tv_usec/1000.-begin.tv_usec/1000.)
 27 
 28 typedef struct 
 29 {
 30     MppCodingType   type;
 31     RK_U32          width;
 32     RK_U32          height;
 33     MppFrameFormat  format;
 34 
 35     RK_U32          num_frames;
 36 } MpiEncTestCmd;
 37 
 38 typedef struct 
 39 {
 40     //global flow control flag
 41     RK_U32 frm_eos;
 42     RK_U32 pkt_eos;
 43     RK_U32 frame_count;
 44     RK_U64 stream_size;
 45 
 46     //input ang output file
 47     FILE *fp_input;
 48     FILE *fp_output;
 49 
 50     //input and output
 51     MppBuffer frm_buf;
 52     MppEncSeiMode sei_mode;
 53 
 54     //base flow context
 55     MppCtx ctx;
 56     MppApi *mpi;
 57     MppEncPrepCfg prep_cfg;
 58     MppEncRcCfg rc_cfg;
 59     MppEncCodecCfg codec_cfg;   
 60 
 61     //paramter for resource malloc
 62     RK_U32 width;
 63     RK_U32 height;
 64     RK_U32 hor_stride; //horizontal stride  
 65     RK_U32 ver_stride; //vertical stride  
 66     MppFrameFormat fmt;
 67     MppCodingType type;
 68     RK_U32 num_frames;
 69 
 70     //resources
 71     size_t frame_size;
 72     //NOTE: packet buffer may overflow
 73     size_t packet_size;
 74 
 75     //rate control runtime parameter
 76     RK_S32 gop;
 77     RK_S32 fps;
 78     RK_S32 bps;
 79 } MpiEncTestData;
 80 
 81 MpiEncTestData data;
 82 MpiEncTestCmd  cmd_ctx;
 83 MpiEncTestData *ptr1;
 84 
 85 MPP_RET ret = MPP_OK;
 86 
 87 FILE *fp_out = fopen("result.h264", "w+b");
 88 
 89 MPP_RET test_ctx_init(MpiEncTestData **data, MpiEncTestCmd *cmd)
 90 {
 91     MpiEncTestData *p = NULL;
 92     MPP_RET ret = MPP_OK;
 93 
 94     if (!data || !cmd) 
 95        {
 96         mpp_err_f("invalid input data %p cmd %p\n", data, cmd);
 97         return MPP_ERR_NULL_PTR;
 98     }
 99 
100     p = mpp_calloc(MpiEncTestData, 1);
101     if (!p) 
102     {
103         mpp_err_f("create MpiEncTestData failed\n");
104         ret = MPP_ERR_MALLOC;