Hello!
I try use imx-lib, not GStreamer, for capture and encode video. Because my matrix have output data in YUV422 format I have to use IPU for prepare data for codec, convert YUV422 to YUV420.
Capture code:
typedef struct {
__u32 offset;
__u32 length;
void *data;
} cap_buffer;
cap_buffer video_buffer[BUFFER_NUM];
for (i = 0; i < BUFFER_NUM; i++) {
memset(&buf, 0, sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.index = i;
if (ioctl(fd, VIDIOC_QUERYBUF, &buf)) {
daemon_error("Failed VIDIOC_QUERYBUF, errno %d (%s)",
errno, strerror(errno));
return -1;
}
video_buffer[i].length = buf.length;
video_buffer[i].offset = buf.m.offset;
video_buffer[i].data = mmap(NULL, buf.length,
PROT_READ | PROT_WRITE, MAP_PRIVATE, fd,
(off_t)buf.m.offset);
if (NULL == video_buffer[i].data) {
daemon_error("Mmap failed, errno %d (%s)", errno, strerror(errno));
return -1;
}
}
for (i = 0; i < BUFFER_NUM; i++) {
memset(&buf, 0, sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = i;
buf.m.offset = video_buffer[i].offset;
if (ioctl(fd, VIDIOC_QBUF, &buf)) {
daemon_error("Failed VIDIOC_QBUF, errno %d (%s)",
errno, strerror(errno));
return -1;
}
}
IPU configuration:
ipu_lib_input_param_t input;
ipu_lib_output_param_t output;
input.width = width;
input.height = height;
input.fmt = IPU_PIX_FMT_YUYV;
output.width = width;
output.height = height;
output.fmt = IPU_PIX_FMT_YVU420P;
mxc_ipu_lib_task_init(&input, NULL, &output, OP_NORMAL_MODE, ipu_handle);
And use it:
unsigned char out_ipu[1280 * 720 * 3 / 2] = {0};
while (1) {
struct v4l2_buffer v4l2_buf;
v4l2_get(&v4l2_buf);
cap_buffer *data = v4l2_data(v4l2_buf.index); //get pointer on v4l2 data
ipu_handle.inbuf_start[0] = data->data;
ipu_handle.outbuf_start[0] = out_ipu;
mxc_ipu_lib_task_buf_update(&ipu_handle, 0, 0, 0, NULL, NULL);
............
}
All work without error, but unfortunally output buffer unchanged, I write it to file.
I try use memcpy for fill ipu_handle.inbuf_start[0] and ipu_handle.outbuf_start[0], but this not solve problem.
How should I configure inbuf_start and outbuf_start?
Thank you and excuse my bad english.
Update:
Problem solved, I set V4L2 buffer offset as input buffer user_def_paddr[0]
