amlogic播放mp4文件的代码

以下是使用Amlogic平台播放MP4文件的示例代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <linux/videodev2.h>
#include <linux/v4l2-controls.h>

#define VIDEO_DEVICE "/dev/video10"

int main(int argc, char **argv) {
    int fd = open(VIDEO_DEVICE, O_RDWR);
    if (fd < 0) {
        perror("Failed to open video device");
        return -1;
    }

    struct v4l2_capability cap;
    if (ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0) {
        perror("Failed to query capabilities");
        close(fd);
        return -1;
    }

    struct v4l2_format fmt = {
        .type = V4L2_BUF_TYPE_VIDEO_OUTPUT,
        .fmt.pix = {
            .width = 1920,
            .height = 1080,
            .pixelformat = V4L2_PIX_FMT_H264,
            .field = V4L2_FIELD_NONE,
            .bytesperline = 0,
            .sizeimage = 0,
            .colorspace = V4L2_COLORSPACE_DEFAULT,
        },
    };
    if (ioctl(fd, VIDIOC_S_FMT, &fmt) < 0) {
        perror("Failed to set format");
        close(fd);
        return -1;
    }

    struct v4l2_buffer buf = {
        .type = V4L2_BUF_TYPE_VIDEO_OUTPUT,
        .memory = V4L2_MEMORY_MMAP,
    };
    if (ioctl(fd, VIDIOC_REQBUFS, &buf) < 0) {
        perror("Failed to request buffers");
        close(fd);
        return -1;
    }

    buf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
    buf.memory = V4L2_MEMORY_MMAP;
    if (ioctl(fd, VIDIOC_QUERYBUF, &buf) < 0) {
        perror("Failed to query buffer");
        close(fd);
        return -1;
    }

    void *data = mmap(NULL, buf.length, PROT_READ | PROT_WRITE, MAP_SHARED, fd, buf.m.offset);
    if (data == MAP_FAILED) {
        perror("Failed to mmap buffer");
        close(fd);
        return -1;
    }

    struct stat st;
    if (stat(argv[1], &st) < 0) {
        perror("Failed to stat file");
        munmap(data, buf.length);
        close(fd);
        return -1;
    }

    int file = open(argv[1], O_RDONLY);
    if (file < 0) {
        perror("Failed to open file");
        munmap(data, buf.length);
        close(fd);
        return -1;
    }

    int offset = 0;
    while (offset < st.st_size) {
        int size = read(file, data, buf.length);
        if (size < 0) {
            perror("Failed to read file");
            munmap(data, buf.length);
            close(fd);
            close(file);
            return -1;
        }

        buf.bytesused = size;
        if (ioctl(fd, VIDIOC_QBUF, &buf) < 0) {
            perror("Failed to queue buffer");
            munmap(data, buf.length);
            close(fd);
            close(file);
            return -1;
        }

        if (ioctl(fd, VIDIOC_DQBUF, &buf) < 0) {
            perror("Failed to dequeue buffer");
            munmap(data, buf.length);
            close(fd);
            close(file);
            return -1;
        }

        offset += size;
    }

    munmap(data, buf.length);
    close(fd);
    close(file);

    return 0;
}

请注意，上面的代码仅适用于特定的Amlogic平台和特定的MP4文件。如果您想在其他平台或播放其他类型的文件，请根据需要进行修改。另外，请确保您已经安装了正确的视频驱动程序和相关的库。