本文共 10226 字，大约阅读时间需要 34 分钟。

在前文《》，

好，废话不多说，我们直接进入主题吧！

本文链接：《 》

本文对应的源文件，图片素材，编译后的可执行程序均已打包上传，链接：

《》

一、完整代码

流程比较简单，没啥好说，需要注意：

1. 具体的硬件设备支持的format 格式也不同，我调试的机器 MediaCodec 底层不支持YUV420P图片，因此需要转成 YUV420SP格式。
2. 部分底层设备配置 宽、高有特殊的要求

因此配置format 时要注意结合具体的硬件。

代码中含详细注释，其他的就不多说了，开心看代码吧^_^

现在时间 2020/11/2，前天在家写的代码有点小bug，会编译不过，更正下。

17:34 第二次更新，去除不必要的头文件

# frameworks\av\cmds\libdmsdpcamerahandler\video\H264_Encoder.cpp//// Android Hardware MediaCoec - H264 Encoder// By: ciellee // Date: 2020/10/31//#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        #include 
        
         #include 
         
          #include 
          
           #include 
           
            #include 
            
             #include 
             
              #include 
              
               #include 
               
                //#include "../include/dmsdp_camera_data_type.h"#ifdef LOG_TAG#undef LOG_TAG#endif#define LOG_TAG "H264_Encoder"using namespace android;// H264 Encodersp
                
                  encoder;sp
                 
                   looper;sp
                  
                    self;uint8_t * g_buffer;// H264 video Format uint32_t g_VideoWidth = 1280; // 宽uint32_t g_VideoHeight = 720; // 高uint32_t g_VideoFps = 25; // 帧率uint32_t g_VideoBitRate = 10000000; // 码率static const char* kMimeTypeAvc = "video/avc";static enum { FORMAT_MP4=0, FORMAT_H264, FORMAT_FRAMES, FORMAT_RAW_FRAMES } gOutputFormat = FORMAT_H264; // 配置输出格式uint32_t g_debugNumFrames = 0;#define _SAVE_H264_FILE_ 1 // 保存编码后的内容到 /sdcard/video/output_test.h264 #define _YUV_LOCAL_TEST_ 1 // 使用本地 /sdcard/video/test_0.yuv 测试编码#ifdef _YUV_LOCAL_TEST_// 源文件名：/sdcard/video/test_0.yuvstatic const char* g_pic_Folder = "/sdcard/video/test_";static const char* g_pic_Folder_nv12 = "/sdcard/yuv420sp_video/test_";static const char* g_pic_Format = "yuv";static FILE* g_pic_file = NULL;static char g_pic_file_name[50] = "";static uint16_t g_pic_index = 0;#endif#ifdef _SAVE_H264_FILE_// 本地调试文件输出FILE *g_h264_file;static const char * g_h264_fileName = "/sdcard/video/output_test.h264";#endif///// YUV420P: YYYY UU VV// YUV420SP: YYYY UV UV ///static void YUV420P_to_YUV420SP(uint8_t *yuv420p, uint8_t *yuv420sp, int width, int height){ if(yuv420p == NULL || yuv420sp==NULL || width==0 || height==0) return; int framesize = width * height; memcpy(yuv420sp, yuv420p, framesize); //拷贝 Y 的数据 for(int i = 0; i
                   
                     format = new AMessage; format->setInt32("width", g_VideoWidth); // 宽 format->setInt32("height", g_VideoHeight); // 高 format->setString("mime", kMimeTypeAvc); // 编码名 format->setInt32("color-format", OMX_COLOR_FormatYUV420SemiPlanar); // 编码格式 format->setInt32("bitrate", g_VideoBitRate); // 码率 format->setFloat("frame-rate", g_VideoFps); // 帧率 format->setInt32("i-frame-interval", 20); // I 帧 // 2. 创建编码器 looper = new ALooper; looper->setName("H264_Encoder_looper"); looper->start(); encoder = MediaCodec::CreateByType(looper, kMimeTypeAvc, true); if(encoder == NULL){ ALOGE("[native_camera][%s](%d) Create %s codec Failed !!!\n", __FUNCTION__, __LINE__, kMimeTypeAvc); return -1; } // 3. 配置编码器 err = encoder->configure(format, NULL, NULL, MediaCodec::CONFIGURE_FLAG_ENCODE); if (err != NO_ERROR) { ALOGE("[native_camera][%s](%d) configure %s codec at %dx%d (err=%d) Failed !!!\n", __FUNCTION__, __LINE__, kMimeTypeAvc, g_VideoWidth, g_VideoHeight, err); encoder->release(); encoder = NULL; return err; } // 4. 启动编码器 err = encoder->start(); if (err != NO_ERROR) { ALOGE("[native_camera][%s](%d) Start %s codec (err=%d) Failed !!!\n", __FUNCTION__, __LINE__, kMimeTypeAvc, err); encoder->release(); encoder = NULL; return err; } self = ProcessState::self(); self->startThreadPool(); AString name; encoder->getName(&name); ALOGI("[native_camera][%s](%d) Start %s Success ^_^\n", __FUNCTION__, __LINE__, name.c_str()); // 5. 打开要输出的文件#ifdef _SAVE_H264_FILE_ g_h264_file = fopen(g_h264_fileName, "wb+");#endif g_buffer = (uint8_t *)malloc(sizeof(uint8_t) * g_VideoWidth * g_VideoHeight * 3 / 2); memset(g_buffer, 0, sizeof(uint8_t) * g_VideoWidth * g_VideoHeight * 3 / 2); } return 0;}///int main(int argc, char *argv[]){ status_t err; // 1. 配置 和 初始化 Codec H264_encoder_init(); // 2. 获得输入、输出 buffer数组地址 Vector
                    
                     
                      > h264_input_buffers; Vector
                      
                       
                        > h264_output_buffers; err = encoder->getInputBuffers(&h264_input_buffers); if (err != NO_ERROR) { ALOGI("[native_camera][%s](%d) getInputBuffers Failed (err=%d)\n", __FUNCTION__, __LINE__, err); if(encoder != NULL) encoder->release(); if(looper != NULL) looper->stop(); return -1; } err = encoder->getOutputBuffers(&h264_output_buffers); if (err != NO_ERROR) { ALOGI("[native_camera][%s](%d) getOutputBuffers Failed (err=%d)\n", __FUNCTION__, __LINE__, err); if(encoder != NULL) encoder->release(); if(looper != NULL) looper->stop(); return -1; } int flag = 0; // 3. 开始循环 申请输入buffer、填充数据、不等待查询输出buff，取出解码数据 while( flag == 0 ){ size_t i_index,i_size=0, o_index, o_offset, o_size; int64_t o_ptsUsec; uint32_t o_flags; // 3.1 申请一个可用的buffer index err = encoder->dequeueInputBuffer(&i_index, 500ll); if(err != 0){ ALOGI("[native_camera][%s](%d) dequeueInputBuffer Failed (err=%d), skip current\n", __FUNCTION__, __LINE__, err); usleep(10000); // 10ms continue; } // 3.2 填充数据到 buffer 中 ALOGI("[native_camera][%s](%d) get i_index (%d)\n", __FUNCTION__, __LINE__, i_index); uint8_t * p_input = h264_input_buffers[i_index]->data();#ifdef _YUV_LOCAL_TEST_ { // 3.3 拼凑文件名,读取文件内容 memset(g_pic_file_name, '\0', 50); sprintf(g_pic_file_name, "%s%d.%s", g_pic_Folder, g_pic_index++, g_pic_Format); g_pic_file = fopen(g_pic_file_name, "rb+"); i_size = fread(g_buffer, 1, g_VideoWidth * g_VideoHeight * 3 / 2, g_pic_file); ALOGI("[native_camera][%s](%d) read (%s), size (%d)\n", __FUNCTION__, __LINE__, g_pic_file_name, i_size); fclose(g_pic_file); g_pic_file = NULL; if(g_pic_index >= 100) flag = 1; }#endif // 3.4 将YUV420P 数据转 YUV420SP YUV420P_to_YUV420SP(g_buffer, h264_input_buffers[i_index]->data(), g_VideoWidth, g_VideoHeight);#ifdef _YUV_LOCAL_TEST_ { memset(g_pic_file_name, '\0', 50); sprintf(g_pic_file_name, "%s%d.%s", g_pic_Folder_nv12, g_pic_index, g_pic_Format); g_pic_file = fopen(g_pic_file_name, "wb+"); err = fwrite(h264_input_buffers[i_index]->data(), 1, i_size, g_pic_file); fclose(g_pic_file); g_pic_file = NULL; ALOGI("[native_camera][%s](%d) write (%s), size (%d)\n", __FUNCTION__, __LINE__, g_pic_file_name, err); }#endif ALOGI("[native_camera][%s](%d) queueInputBuffer size (%d)\n", __FUNCTION__, __LINE__, h264_input_buffers[i_index]->size()); // 3.5 将输入buffer 入队列，等待编码 AString err_str; err = encoder->queueInputBuffer(i_index, 0, h264_input_buffers[i_index]->size(), g_pic_index, 0, &err_str); if(err != NO_ERROR){ ALOGI("[native_camera][%s](%d) queueInputBuffer failed (%d) (%s)\n", __FUNCTION__, __LINE__, err, err_str.c_str()); } // 3.6 查询是否有编码后的数据,超时时间 500us err = encoder->dequeueOutputBuffer(&o_index, &o_offset, &o_size, &o_ptsUsec, &o_flags, 500ll); while(err == NO_ERROR){ // got a buffer uint8_t * p_output = h264_output_buffers[o_index]->data(); if (o_size != 0) { ALOGI("[native_camera][%s](%d) Got data in buffer %zu, size=%zu, pts=%, debugNumFrames=%d", __FUNCTION__, __LINE__, o_index, o_size, o_ptsUsec, g_debugNumFrames);#ifdef _SAVE_H264_FILE_ // 将buffers 中的数据写入文件中 fwrite(p_output, 1, o_size, g_h264_file); if ((o_flags & MediaCodec::BUFFER_FLAG_CODECCONFIG) == 0) { fflush(g_h264_file); }#endif g_debugNumFrames++; } // 释放该索引对应的buffer err = encoder->releaseOutputBuffer(o_index); // 获取下一个编码完毕的数据 err = encoder->dequeueOutputBuffer(&o_index, &o_offset, &o_size, &o_ptsUsec, &o_flags, 500ll); } if(err == -EAGAIN){ ALOGI("[native_camera][%s](%d) dequeueOutputBuffer not ready (%d)\n", __FUNCTION__, __LINE__, err); }else if(err == INVALID_OPERATION){ ALOGI("[native_camera][%s](%d) dequeueOutputBuffer INVALID_OPERATION (%d), break\n", __FUNCTION__, __LINE__, err); flag = 1; } usleep(100000); // 5ms } ALOGI("[native_camera][%s](%d) H264 Encoder Complete\n", __FUNCTION__, __LINE__); #ifdef _SAVE_H264_FILE_ if(g_h264_file != NULL) fflush(g_h264_file); fclose(g_h264_file);#endif if(encoder != NULL) encoder->release(); if(looper != NULL) looper->stop(); return 0;}
                       
                      
                     
                    
                   
                  
                 
                
               
              
             
            
           
          
         
        
       
      
     
    
   

待调试：

二、Android.mk

# frameworks\av\cmds\libdmsdpcamerahandler\Android.mkLOCAL_PATH:= $(call my-dir)include $(CLEAR_VARS)LOCAL_SRC_FILES := \	./video/H264_Encoder.cppLOCAL_SHARED_LIBRARIES := \	libstagefright libmedia libmedia_omx libutils libbinder libstagefright_foundation \	libjpeg libui libgui libcutils liblog libEGL libGLESv2LOCAL_C_INCLUDES := \	./include \	./video \	frameworks/av/media/libstagefright \	frameworks/av/media/libstagefright/include \	frameworks/native/include/media/openmax \	external/jpegLOCAL_CFLAGS := -Werror -WallLOCAL_CFLAGS += -Wno-multichar  -Wno-unused-parameter  -Wno-sign-compare  -Wno-unused-variable -Wno-unused-function -Wno-format#LOCAL_CFLAGS += -UNDEBUGLOCAL_MODULE_TAGS := optionalLOCAL_MODULE:= H264_Encoderinclude $(BUILD_EXECUTABLE)

三、代码调试

在网上下载四张1280x720 格式图片，使用FFMPEG 转成 YUV420P 格式的 RAWDATA。

如下图：

将图片PUSH 到车机中，按 1，2，3，4，循环push 100 张图片。（100张图，25帧fps，总共4s ）

push 脚本如下：

adb push 1.yuv   /sdcard/video/test_0.yuvadb push 2.yuv   /sdcard/video/test_1.yuvadb push 3.yuv   /sdcard/video/test_2.yuvadb push 4.yuv   /sdcard/video/test_3.yuvadb push 1.yuv   /sdcard/video/test_4.yuvadb push 2.yuv   /sdcard/video/test_5.yuvadb push 3.yuv   /sdcard/video/test_6.yuvadb push 4.yuv   /sdcard/video/test_7.yuvadb push 1.yuv   /sdcard/video/test_8.yuvadb push 2.yuv   /sdcard/video/test_9.yuvadb push 3.yuv   /sdcard/video/test_10.yuvadb push 4.yuv   /sdcard/video/test_11.yuvadb push 1.yuv   /sdcard/video/test_12.yuv。。。。。。 省略adb push 3.yuv   /sdcard/video/test_94.yuvadb push 4.yuv   /sdcard/video/test_95.yuvadb push 1.yuv   /sdcard/video/test_96.yuvadb push 2.yuv   /sdcard/video/test_97.yuvadb push 3.yuv   /sdcard/video/test_98.yuvadb push 4.yuv   /sdcard/video/test_99.yuvadb push 1.yuv   /sdcard/video/test_100.yuvadb push 2.yuv   /sdcard/video/test_101.yuv

将生成的可执行程序 H264_Encoder push 到车机中，执行。

导出转换成 NV12（YUV420SP）格式的图片数据， adb pull /sdcard/yuv420sp_video/ .

导出编码生成的H264 视频文件：adb pull /sdcard/video/output_test.h264 .

转载地址：https://ciellee.blog.csdn.net/article/details/109400381 如侵犯您的版权，请留言回复原文章的地址，我们会给您删除此文章，给您带来不便请您谅解！