Bug fix function camera_source_init in camera_source.c ,cau failed to open again after shutting down the devicese #408
Description
// mmap() the buffers into userspace memory
for (i = 0 ; i < ctx->bufcnt; i++) {
buf = (struct v4l2_buffer) {0};
buf.type = type;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = i;
struct v4l2_plane planes[FMT_NUM_PLANES];
buf.memory = V4L2_MEMORY_MMAP;
if (V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE == type) {
buf.m.planes = planes;
buf.length = FMT_NUM_PLANES;
}
if (-1 == camera_source_ioctl(ctx->fd, VIDIOC_QUERYBUF, &buf)) {
mpp_err_f("ERROR: VIDIOC_QUERYBUF\n");
goto FAIL;
}
//此段代码会导致关闭后重新打开失败,需要去掉
/*
// ctx->fbuf[i].start = mmap(NULL, buf.length,
// PROT_READ | PROT_WRITE, MAP_SHARED,
// ctx->fd, buf.m.offset);
/
if (V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE == buf.type) {
// tmp_buffers[n_buffers].length = buf.m.planes[0].length;
buf_len = buf.m.planes[0].length;
ctx->fbuf[i].start =
mmap(NULL / start anywhere /,
buf.m.planes[0].length,
PROT_READ | PROT_WRITE / required /,
MAP_SHARED / recommended /,
ctx->fd, buf.m.planes[0].m.mem_offset);
} else {
buf_len = buf.length;
ctx->fbuf[i].start =
mmap(NULL / start anywhere /,
buf.length,
PROT_READ | PROT_WRITE / required /,
MAP_SHARED / recommended */,
ctx->fd, buf.m.offset);
}