写一个c++ ffmpeg打开UYVY相机转换为rgb推流rtsp的代码

以下是使用FFmpeg将UYVY相机数据转换为RGB并推流RTSP的C代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <unistd.h>

#include <libavformat/avformat.h>
#include <libavcodec/avcodec.h>
#include <libavutil/avutil.h>
#include <libavutil/imgutils.h>
#include <libswscale/swscale.h>

#define VIDEO_SRC_WIDTH 640
#define VIDEO_SRC_HEIGHT 480
#define VIDEO_CODEC_ID AV_CODEC_ID_H264
#define VIDEO_BITRATE 500000
#define VIDEO_GOP_SIZE 10
#define VIDEO_MAX_B_FRAMES 1

#define RTSP_URL "rtsp://127.0.0.1:8554/test"

int main(int argc, char *argv[])
{
    int ret;
    AVFormatContext *in_fmt_ctx = NULL;
    AVCodecContext *in_codec_ctx = NULL;
    AVCodec *in_codec = NULL;
    AVFrame *in_frame = NULL;
    AVPacket in_packet;
    AVFormatContext *out_fmt_ctx = NULL;
    AVCodecContext *out_codec_ctx = NULL;
    AVCodec *out_codec = NULL;
    AVFrame *out_frame = NULL;
    AVPacket out_packet;
    struct SwsContext *sws_ctx = NULL;

    uint8_t *in_data = NULL, *out_data = NULL;
    int in_data_size = 0, out_data_size = 0;

    // Open input device
    in_fmt_ctx = avformat_alloc_context();
    AVInputFormat *in_fmt = av_find_input_format("v4l2");
    if ((ret = avformat_open_input(&in_fmt_ctx, "/dev/video0", in_fmt, NULL)) < 0) {
        printf("Could not open input device\n");
        goto end;
    }

    if ((ret = avformat_find_stream_info(in_fmt_ctx, NULL)) < 0) {
        printf("Could not find stream information\n");
        goto end;
    }

    // Find video stream
    int video_stream_index = -1;
    for (int i = 0; i < in_fmt_ctx->nb_streams; i++) {
        if (in_fmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
            video_stream_index = i;
            break;
        }
    }
    if (video_stream_index < 0) {
        printf("Could not find video stream\n");
        goto end;
    }

    // Get codec and codec context
    in_codec_ctx = avcodec_alloc_context3(NULL);
    avcodec_parameters_to_context(in_codec_ctx, in_fmt_ctx->streams[video_stream_index]->codecpar);
    in_codec = avcodec_find_decoder(in_codec_ctx->codec_id);
    if (!in_codec) {
        printf("Unsupported codec\n");
        goto end;
    }
    if ((ret = avcodec_open2(in_codec_ctx, in_codec, NULL)) < 0) {
        printf("Could not open codec\n");
        goto end;
    }

    // Allocate input and output frames
    in_frame = av_frame_alloc();
    out_frame = av_frame_alloc();
    if (!in_frame || !out_frame) {
        printf("Could not allocate frame\n");
        goto end;
    }

    // Allocate input and output buffers
    in_data_size = av_image_get_buffer_size(in_codec_ctx->pix_fmt, in_codec_ctx->width, in_codec_ctx->height, 1);
    out_data_size = av_image_get_buffer_size(AV_PIX_FMT_RGB24, VIDEO_SRC_WIDTH, VIDEO_SRC_HEIGHT,