delete personal file

cpp/convert_stream.c

@@ -0,0 +1,398 @@
+#include "libavfilter/avfilter.h"
+#include "libavformat/avformat.h"
+#include "libavcodec/avcodec.h"
+#include "libavutil/avutil.h"
+#include "libavutil/opt.h"
+#include "libavdevice/avdevice.h"
+#include <stdio.h>
+
+struct Input
+{
+    char *h265_data;
+    int offset;
+    int size;
+};
+
+struct Output
+{
+    char *jpeg_data;
+    int offset;
+};
+
+//函数声明
+int saveJpg(AVFrame *pFrame, struct Output *output_data);
+//缓存1Mb
+const int BUF_SIZE = 1048576;
+
+//  const 32KB = 32768;
+// char h265_data; //传入的h265文件
+// // char *h265_data;
+// int read_true_size = 0; //h265文件实际大小
+// int read_offset = 0;    //读取的偏移
+
+// int write_offset = 0;
+// uint8_t jpeg_data[1048576] = {"\0"};
+// uint8_t *jpeg_data = NULL;
+
+//读取数据的回调函数-------------------------
+//AVIOContext使用的回调函数！
+//注意：返回值是读取的字节数
+//手动初始化AVIOContext只需要两个东西：内容来源的buffer，和读取这个Buffer到FFmpeg中的函数
+//回调函数，功能就是：把buf_size字节数据送入buf即可
+//第一个参数(void *opaque)一般情况下可以不用
+int fill_iobuffer(void *opaque, uint8_t *buf, int buf_size)
+{
+    //从h256_data拷贝到buf中buf_size个字节
+
+    struct Input *data = (struct Input *)opaque;
+    // int read_offset = data->offset;
+    int size = data->size;
+    char *h265_data = data->h265_data;
+
+    if (data->offset + buf_size - 1 < size)
+    {
+        //读取未溢出 直接复制
+        memcpy(buf, h265_data + data->offset, buf_size);
+        data->offset += buf_size;
+        // printf("callback: read offset: %d\n", read_offset);
+        return buf_size;
+    }
+    else
+    {
+        //已经溢出无法读取
+        if (data->offset >= size)
+        {
+            return -1;
+        }
+        else
+        {
+            //还有剩余字节未读取但不到buf_size 读取剩余字节
+            int real_read = size - data->offset;
+            memcpy(buf, h265_data + data->offset, real_read);
+            data->offset += buf_size;
+            printf("callback: read offset: %d\n", data->offset);
+            return real_read;
+        }
+    }
+}
+
+int convert(struct Input *input_data, struct Output *output_data)
+{
+    AVFormatContext *fmtCtx = NULL;      // 文件格式管理
+    const AVCodec *codec;                // 定义解码器
+    AVCodecContext *codeCtx = NULL;      // 定义解码器上下文
+    AVStream *stream = NULL;             // 定义视频流
+    int streamType;                      // 流类型
+    AVCodecParameters *originPar = NULL; // 解码器的参数
+    AVFrame *frame;                      // 帧
+    AVPacket avpkt;                      // 数据包
+
+    //打开文件描述符
+    // fp_open = fopen(inputFile, "rb+");
+    fmtCtx = avformat_alloc_context();
+    unsigned char *iobuffer = (unsigned char *)av_malloc(BUF_SIZE);
+    //初始化AVIOContext  fill_iobuffer为自定的回调函数
+    AVIOContext *avio = avio_alloc_context(iobuffer, BUF_SIZE, 0, input_data, fill_iobuffer, NULL, NULL);
+    fmtCtx->pb = avio;
+
+    if (avformat_open_input(&fmtCtx, "nothing", NULL, NULL) < 0) // 成功返回0, 错误返回负值, 后两个参数用于指定文件格式
+    {
+        printf("Error in open file");
+        exit(0);
+    }
+
+    if (avformat_find_stream_info(fmtCtx, NULL) < 0) // 失败返回负值
+    {
+        printf("Error in find stream");
+        exit(0);
+    }
+
+    //av_dump_format(fmt_ctx, 0, inputFile, 0); // 打印控制信息
+    av_init_packet(&avpkt); // 初始化数据包
+    avpkt.data = NULL;
+    avpkt.size = 0;
+
+    streamType = av_find_best_stream(fmtCtx, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);
+    if (streamType < 0)
+    {
+        printf("Error in find best stream type");
+        exit(0);
+    }
+
+    originPar = fmtCtx->streams[streamType]->codecpar; // 获取流对应的解码器参数
+    codec = avcodec_find_decoder(originPar->codec_id); // 根据解码器参数获取解码器
+    if (!codec)
+    { // 未找到返回NULL
+        printf("Error in get the codec");
+        exit(0);
+    }
+
+    codeCtx = avcodec_alloc_context3(codec); // 初始化解码器上下文
+    if (!codeCtx)
+    {
+        printf("Error in allocate the codeCtx");
+        exit(0);
+    }
+
+    if (avcodec_parameters_to_context(codeCtx, originPar) < 0) // 替换解码器上下文参数
+    {
+        printf("Error in replace the parameters int the codeCtx");
+        exit(0);
+    }
+
+    avcodec_open2(codeCtx, codec, NULL); //打开解码器
+
+    frame = av_frame_alloc(); // 初始化帧, 用默认值填充字段
+    if (!frame)
+    {
+        printf("Error in allocate the frame");
+        exit(0);
+    }
+
+    av_read_frame(fmtCtx, &avpkt); //从文件中读取一个数据包, 存储到avpkt中
+    if (avpkt.stream_index == streamType)
+    {                                                 // 读取的数据包类型正确
+        if (avcodec_send_packet(codeCtx, &avpkt) < 0) // 将数据包发送到解码器中
+        {
+            printf("Error in the send packet");
+            exit(0);
+        }
+
+        while (avcodec_receive_frame(codeCtx, frame) == 0)
+        {
+            saveJpg(frame, output_data);
+        }
+    }
+
+    av_packet_unref(&avpkt);
+}
+
+//写文件的回调函数
+int write_buffer(void *opaque, uint8_t *buf, int buf_size)
+{
+    struct Output *data = (struct Output *)opaque;
+
+    if (buf_size > BUF_SIZE)
+    {
+        return -1;
+    }
+
+    memcpy(data->jpeg_data + data->offset, buf, buf_size);
+    data->offset += buf_size;
+    return buf_size;
+}
+
+int saveJpg(AVFrame *pFrame, struct Output *output_data)
+{
+    int width = pFrame->width;
+    int height = pFrame->height;
+    AVCodecContext *pCodeCtx = NULL;
+
+    //打开输出文件
+    // fp_write = fopen(out_name, "wb+");
+    AVFormatContext *pFormatCtx = NULL;
+    avformat_alloc_output_context2(&pFormatCtx, NULL, "mjpeg", NULL);
+    // AVFormatContext *pFormatCtx = avformat_alloc_context();
+    // 设置输出文件格式
+    // pFormatCtx->oformat = av_guess_format("mjpeg", NULL, NULL);
+
+    unsigned char *outbuffer = (unsigned char *)av_malloc(BUF_SIZE);
+    //新建一个AVIOContext  并与pFormatCtx关联
+    AVIOContext *avio_out = avio_alloc_context(outbuffer, BUF_SIZE, 1, output_data, NULL, write_buffer, NULL);
+    pFormatCtx->pb = avio_out;
+    pFormatCtx->flags = AVFMT_FLAG_CUSTOM_IO | AVFMT_FLAG_FLUSH_PACKETS;
+
+    // //创建并初始化输出AVIOContext
+    // if (avio_open(&pFormatCtx->pb, "./bin/nothing.jpeg", AVIO_FLAG_READ_WRITE) < 0)
+    // {
+    //     printf("Couldn't open output file.\n");
+    //     return -1;
+    // }
+
+    // 构建一个新stream
+    AVStream *pAVStream = avformat_new_stream(pFormatCtx, 0);
+    if (pAVStream == NULL)
+    {
+        return -1;
+    }
+    AVCodecParameters *parameters = pAVStream->codecpar;
+    parameters->codec_id = pFormatCtx->oformat->video_codec;
+    parameters->codec_type = AVMEDIA_TYPE_VIDEO;
+    parameters->format = AV_PIX_FMT_YUVJ420P;
+    parameters->width = pFrame->width;
+    parameters->height = pFrame->height;
+
+    AVCodec *pCodec = avcodec_find_encoder(pAVStream->codecpar->codec_id);
+
+    if (!pCodec)
+    {
+        printf("Could not find encoder\n");
+        return -1;
+    }
+
+    pCodeCtx = avcodec_alloc_context3(pCodec);
+    if (!pCodeCtx)
+    {
+        fprintf(stderr, "Could not allocate video codec context\n");
+        return -1;
+    }
+
+    if ((avcodec_parameters_to_context(pCodeCtx, pAVStream->codecpar)) < 0)
+    {
+        fprintf(stderr, "Failed to copy %s codec parameters to decoder context\n",
+                av_get_media_type_string(AVMEDIA_TYPE_VIDEO));
+        return -1;
+    }
+
+    pCodeCtx->time_base = (AVRational){1, 25};
+
+    if (avcodec_open2(pCodeCtx, pCodec, NULL) < 0)
+    {
+        printf("Could not open codec.");
+        return -1;
+    }
+
+    int ret = avformat_write_header(pFormatCtx, NULL);
+    if (ret < 0)
+    {
+        printf("write_header fail\n");
+        return -1;
+    }
+
+    int y_size = width * height;
+
+    //Encode
+    // 给AVPacket分配足够大的空间
+    AVPacket pkt;
+    av_new_packet(&pkt, y_size * 3);
+
+    // 编码数据
+    ret = avcodec_send_frame(pCodeCtx, pFrame);
+    if (ret < 0)
+    {
+        printf("Could not avcodec_send_frame.");
+        return -1;
+    }
+
+    // 得到编码后数据
+    ret = avcodec_receive_packet(pCodeCtx, &pkt);
+    if (ret < 0)
+    {
+        printf("Could not avcodec_receive_packet");
+        return -1;
+    }
+
+    // printf("av_write_frame\n");
+    ret = av_write_frame(pFormatCtx, &pkt);
+    avio_flush(avio_out);
+    // printf("av_write_frame done\n");
+    if (ret < 0)
+    {
+        printf("Could not av_write_frame");
+        return -1;
+    }
+    // printf("av_packet_unref\n");
+    av_packet_unref(&pkt);
+
+    //Write Trailer
+    av_write_trailer(pFormatCtx);
+    // printf("av_write_trailer\n");
+
+    if (pFormatCtx->pb)
+    {
+        avio_context_free(&pFormatCtx->pb);
+    }
+    // printf("avio_free\n");
+
+    if (pFormatCtx)
+    {
+        avformat_free_context(pFormatCtx);
+    }
+    // printf("avformat_free_context\n");
+
+    if (pCodeCtx)
+    {
+        avcodec_close(pCodeCtx);
+    }
+    // printf("avcodec_close\n");
+
+    return 0;
+}
+
+//返回des
+int h265_to_jpeg(char *src, char *des, int input_size)
+{
+    // memcpy(h265_data, src, size);
+    // // h265_data = src;
+    // read_true_size = size;
+    struct Input input_data;
+    input_data.h265_data = src;
+    input_data.offset = 0;
+    input_data.size = input_size;
+
+    struct Output output_data;
+    output_data.jpeg_data = des;
+    output_data.offset = 0;
+
+    int err = 0;
+    err = convert(&input_data, &output_data);
+    if (err != 0)
+    {
+        return -1;
+    }
+
+    // memcpy(des, jpeg_data, write_offset);
+
+    return output_data.offset;
+}
+
+int main()
+{
+    char *inputFile = "/work/dana_work/gopath/src/github.com/lucish/convert-video/src/huangxiao.h265";
+    FILE *fp_read;
+    FILE *fp_write;
+    fp_read = fopen(inputFile, "rb+");
+
+    char h265_data[1048576], output[1048576];
+    int size = 0;
+    //测试 将目标文件全部读取到h265_data中, true_size为文件实际大小
+    if (!feof(fp_read))
+    {
+        size = fread(h265_data, 1, 1048576, fp_read);
+        printf("一次读取全部文件 实际大小: %d\n", size);
+        if (!size)
+        {
+            printf("read file err!\n");
+            return 0;
+        }
+        printf("h256 strlen: %ld\n", strlen(h265_data));
+    }
+
+    int ret = h265_to_jpeg(h265_data, output, size);
+
+    // printf("size of jpeg: %ld,  write_offset: %d\n", sizeof(jpeg_data), write_offset);
+
+    char *outputFile = "bin/test.jpeg";
+    char *buf = (char *)malloc(ret + 1);
+    memset(buf, 0, ret + 1);
+    memcpy(buf, output, ret);
+    //测试 将读取到的数据全部写入文件
+    fp_write = fopen(outputFile, "wb+");
+    if (!feof(fp_write))
+    {
+        int true_size = fwrite(buf, 1, ret, fp_write);
+    }
+    else
+    {
+        printf("write file err");
+        return 0;
+    }
+
+    free(buf);
+    // free(jpeg_data);
+
+    fclose(fp_read);
+    fclose(fp_write);
+    // printf("final read offset: %d\n", read_offset);
+    return 0;
+}

cpp/run.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+clear
+rm -r bin
+mkdir bin
+
+gcc convert_stream.c -o bin/convert \
+-I/usr/local/ffmpeg/include \
+-L/usr/local/ffmpeg/lib -lavcodec -lavformat -lavfilter -lavutil -lavdevice -lswresample
+
+./bin/convert