imx6 V4L2視訊採集和播放（輸入video0，輸出為video17）
阿新 • • 發佈：2019-02-13
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memset(&capture_buf, 0, sizeof(capture_buf));
capture_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
capture_buf.memory = V4L2_MEMORY_MMAP;
if (ioctl(fd_capture_v4l, VIDIOC_DQBUF, &capture_buf) < 0) {
printf("VIDIOC_DQBUF failed.\n");
return TFAIL;
}
memset(&output_buf, 0, sizeof(output_buf));
output_buf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
output_buf.memory = V4L2_MEMORY_MMAP;
if (i < g_output_num_buffers) {
output_buf.index = i;
if (ioctl(fd_output_v4l, VIDIOC_QUERYBUF, &output_buf) < 0)
{
printf("VIDIOC_QUERYBUF failed\n");
return TFAIL;
}
} else {
output_buf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
output_buf.memory = V4L2_MEMORY_MMAP;
if (ioctl(fd_output_v4l, VIDIOC_DQBUF, &output_buf) < 0)
{
printf("VIDIOC_DQBUF failed\n");
return TFAIL;
}
}
memcpy(output_buffers[output_buf.index].start, capture_buffers[capture_buf.index].start, g_frame_size);
if (ioctl(fd_capture_v4l, VIDIOC_QBUF, &capture_buf) < 0) {
printf("VIDIOC_QBUF failed\n");
return TFAIL;
}
output_buf.timestamp.tv_sec = tv_start.tv_sec;
output_buf.timestamp.tv_usec = tv_start.tv_usec + (g_frame_period * i);
if (g_vdi_enable)
output_buf.field = g_tb ? V4L2_FIELD_INTERLACED_TB :
V4L2_FIELD_INTERLACED_BT;
if (ioctl(fd_output_v4l, VIDIOC_QBUF, &output_buf) < 0)
{
printf("VIDIOC_QBUF failed\n");
return TFAIL;
}
if (i == 1) {
type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
if (ioctl(fd_output_v4l, VIDIOC_STREAMON, &type) < 0) {
printf("Could not start stream\n");
return TFAIL;
}
}
}
memset(&capture_buf, 0, sizeof(capture_buf));
capture_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
capture_buf.memory = V4L2_MEMORY_MMAP;
if (ioctl(fd_capture_v4l, VIDIOC_DQBUF, &capture_buf) < 0) {
printf("VIDIOC_DQBUF failed.\n");
return TFAIL;
}
memset(&output_buf, 0, sizeof(output_buf));
output_buf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
output_buf.memory = V4L2_MEMORY_MMAP;
if (i < g_output_num_buffers) {
output_buf.index = i;
if (ioctl(fd_output_v4l, VIDIOC_QUERYBUF, &output_buf) < 0)
{
printf("VIDIOC_QUERYBUF failed\n");
return TFAIL;
}
} else {
output_buf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
output_buf.memory = V4L2_MEMORY_MMAP;
if (ioctl(fd_output_v4l, VIDIOC_DQBUF, &output_buf) < 0)
{
printf("VIDIOC_DQBUF failed\n");
return TFAIL;
}
}
memcpy(output_buffers[output_buf.index].start, capture_buffers[capture_buf.index].start, g_frame_size);
if (ioctl(fd_capture_v4l, VIDIOC_QBUF, &capture_buf) < 0) {
printf("VIDIOC_QBUF failed\n");
return TFAIL;
}
output_buf.timestamp.tv_sec = tv_start.tv_sec;
output_buf.timestamp.tv_usec = tv_start.tv_usec + (g_frame_period * i);
if (g_vdi_enable)
output_buf.field = g_tb ? V4L2_FIELD_INTERLACED_TB :
V4L2_FIELD_INTERLACED_BT;
if (ioctl(fd_output_v4l, VIDIOC_QBUF, &output_buf) < 0)
{
printf("VIDIOC_QBUF failed\n");
return TFAIL;
}
if (i == 1) {
type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
if (ioctl(fd_output_v4l, VIDIOC_STREAMON, &type) < 0) {
printf("Could not start stream\n");
return TFAIL;
}
}
}