diff --git a/cmd/camera_direct.c b/cmd/camera_direct.c
index d6c8eb0..63dbd0d 100644
--- a/cmd/camera_direct.c
+++ b/cmd/camera_direct.c
@@ -10,24 +10,22 @@
 
 int camera_configure_direct(camera_t *camera)
 {
-  if (device_open_buffer_list(camera->camera, true, camera->width, camera->height, camera->format, 0, camera->nbufs) < 0) {
+  if (device_open_buffer_list(camera->camera, true, camera->width, camera->height, camera->format, 0, camera->nbufs, true) < 0) {
     return -1;
   }
 
   buffer_list_t *src = camera->camera->capture_list;
 
   camera->codec_jpeg = device_open("JPEG", "/dev/video31");
-  camera->codec_jpeg->buf_sink = true;
   camera->codec_h264 = device_open("H264", "/dev/video11");
-  camera->codec_h264->buf_sink = true;
 
-  if (device_open_buffer_list(camera->codec_jpeg, false, src->fmt_width, src->fmt_height, src->fmt_format, src->fmt_bytesperline, camera->nbufs) < 0 ||
-    device_open_buffer_list(camera->codec_jpeg, true, src->fmt_width, src->fmt_height, V4L2_PIX_FMT_JPEG, 0, camera->nbufs) < 0) {
+  if (device_open_buffer_list_output(camera->codec_jpeg, src) < 0 ||
+    device_open_buffer_list_capture(camera->codec_jpeg, src, 1.0, V4L2_PIX_FMT_JPEG, true) < 0) {
     return -1;
   }
 
-  if (device_open_buffer_list(camera->codec_h264, false, src->fmt_width, src->fmt_height, src->fmt_format, src->fmt_bytesperline, camera->nbufs) < 0 ||
-    device_open_buffer_list(camera->codec_h264, true, src->fmt_width, src->fmt_height, V4L2_PIX_FMT_H264, 0, camera->nbufs) < 0) {
+  if (device_open_buffer_list_output(camera->codec_h264, src) < 0 ||
+    device_open_buffer_list_capture(camera->codec_h264, src, 1.0, V4L2_PIX_FMT_H264, true) < 0) {
     return -1;
   }
 
diff --git a/cmd/camera_isp.c b/cmd/camera_isp.c
index 810e759..1a948e1 100644
--- a/cmd/camera_isp.c
+++ b/cmd/camera_isp.c
@@ -12,7 +12,7 @@ void write_yuvu(buffer_t *buffer);
 
 int camera_configure_isp(camera_t *camera, float high_div, float low_div)
 {
-  if (device_open_buffer_list(camera->camera, true, camera->width, camera->height, camera->format, 0, camera->nbufs) < 0) {
+  if (device_open_buffer_list(camera->camera, true, camera->width, camera->height, camera->format, 0, camera->nbufs, true) < 0) {
     return -1;
   }
 
@@ -22,12 +22,10 @@ int camera_configure_isp(camera_t *camera, float high_div, float low_div)
   camera->isp.isp_yuuv = device_open("ISP-YUUV", "/dev/video14");
   camera->isp.isp_yuuv->output_device = camera->isp.isp_srgb;
   camera->codec_jpeg = device_open("JPEG", "/dev/video31");
-  camera->codec_jpeg->buf_sink = true;
   camera->codec_h264 = device_open("H264", "/dev/video11");
-  camera->codec_h264->buf_sink = true;
 
-  if (device_open_buffer_list(camera->isp.isp_srgb, false, src->fmt_width, src->fmt_height, src->fmt_format, src->fmt_bytesperline, camera->nbufs) < 0 ||
-    device_open_buffer_list(camera->isp.isp_yuuv, true, src->fmt_width / high_div, src->fmt_height / high_div, V4L2_PIX_FMT_YUYV, 0, camera->nbufs) < 0) {
+  if (device_open_buffer_list_output(camera->isp.isp_srgb, src) < 0 ||
+    device_open_buffer_list_capture(camera->isp.isp_yuuv, src, high_div, V4L2_PIX_FMT_YUYV, true) < 0) {
     return -1;
   }
 
@@ -35,7 +33,7 @@ int camera_configure_isp(camera_t *camera, float high_div, float low_div)
     camera->isp.isp_yuuv_low = device_open("ISP-YUUV-LOW", "/dev/video15");
     camera->isp.isp_yuuv_low->output_device = camera->isp.isp_srgb;
 
-    if (device_open_buffer_list(camera->isp.isp_yuuv_low, true, src->fmt_width / low_div, src->fmt_height / low_div, V4L2_PIX_FMT_YUYV, 0, camera->nbufs) < 0) {
+    if (device_open_buffer_list_capture(camera->isp.isp_yuuv_low, src, low_div, V4L2_PIX_FMT_YUYV, true) < 0) {
       return -1;
     }
 
@@ -44,13 +42,13 @@ int camera_configure_isp(camera_t *camera, float high_div, float low_div)
     src = camera->isp.isp_yuuv->capture_list;
   }
 
-  if (device_open_buffer_list(camera->codec_jpeg, false, src->fmt_width, src->fmt_height, src->fmt_format, src->fmt_bytesperline, camera->nbufs) < 0 ||
-    device_open_buffer_list(camera->codec_jpeg, true, src->fmt_width, src->fmt_height, V4L2_PIX_FMT_JPEG, 0, camera->nbufs) < 0) {
+  if (device_open_buffer_list_output(camera->codec_jpeg, src) < 0 ||
+    device_open_buffer_list_capture(camera->codec_jpeg, src, 1.0, V4L2_PIX_FMT_JPEG, true) < 0) {
     return -1;
   }
 
-  if (device_open_buffer_list(camera->codec_h264, false, src->fmt_width, src->fmt_height, src->fmt_format, src->fmt_bytesperline, camera->nbufs) < 0 ||
-    device_open_buffer_list(camera->codec_h264, true, src->fmt_width, src->fmt_height, V4L2_PIX_FMT_H264, 0, camera->nbufs) < 0) {
+  if (device_open_buffer_list_output(camera->codec_h264, src) < 0 ||
+    device_open_buffer_list_capture(camera->codec_h264, src, 1.0, V4L2_PIX_FMT_H264, true) < 0) {
     return -1;
   }
 
diff --git a/cmd/camera_legacy_isp.c b/cmd/camera_legacy_isp.c
index 40dad01..b7be333 100644
--- a/cmd/camera_legacy_isp.c
+++ b/cmd/camera_legacy_isp.c
@@ -22,7 +22,7 @@ void write_yuvu(buffer_t *buffer)
 
 int camera_configure_legacy_isp(camera_t *camera, float div)
 {
-  if (device_open_buffer_list(camera->camera, true, camera->width, camera->height, camera->format, 0, camera->nbufs) < 0) {
+  if (device_open_buffer_list(camera->camera, true, camera->width, camera->height, camera->format, 0, camera->nbufs, true) < 0) {
     return -1;
   }
 
@@ -30,24 +30,22 @@ int camera_configure_legacy_isp(camera_t *camera, float div)
 
   camera->legacy_isp.isp = device_open("ISP", "/dev/video12");
   camera->codec_jpeg = device_open("JPEG", "/dev/video31");
-  camera->codec_jpeg->buf_sink = true;
   camera->codec_h264 = device_open("H264", "/dev/video11");
-  camera->codec_h264->buf_sink = true;
 
-  if (device_open_buffer_list(camera->legacy_isp.isp, false, src->fmt_width, src->fmt_height, src->fmt_format, src->fmt_bytesperline, camera->nbufs) < 0 ||
-    device_open_buffer_list(camera->legacy_isp.isp, true, src->fmt_width / div, src->fmt_height / div, V4L2_PIX_FMT_YUYV, 0, camera->nbufs) < 0) {
+  if (device_open_buffer_list_output(camera->legacy_isp.isp, src) < 0 ||
+    device_open_buffer_list_capture(camera->legacy_isp.isp, src, div, V4L2_PIX_FMT_YUYV, true) < 0) {
     return -1;
   }
 
   src = camera->legacy_isp.isp->capture_list;
 
-  if (device_open_buffer_list(camera->codec_jpeg, false, src->fmt_width, src->fmt_height, src->fmt_format, src->fmt_bytesperline, camera->nbufs) < 0 ||
-    device_open_buffer_list(camera->codec_jpeg, true, src->fmt_width, src->fmt_height, V4L2_PIX_FMT_JPEG, 0, camera->nbufs) < 0) {
+  if (device_open_buffer_list_output(camera->codec_jpeg, src) < 0 ||
+    device_open_buffer_list_capture(camera->codec_jpeg, src, 1.0, V4L2_PIX_FMT_JPEG, true) < 0) {
     return -1;
   }
 
-  if (device_open_buffer_list(camera->codec_h264, false, src->fmt_width, src->fmt_height, src->fmt_format, src->fmt_bytesperline, camera->nbufs) < 0 ||
-    device_open_buffer_list(camera->codec_h264, true, src->fmt_width, src->fmt_height, V4L2_PIX_FMT_H264, 0, camera->nbufs) < 0) {
+  if (device_open_buffer_list_output(camera->codec_h264, src) < 0 ||
+    device_open_buffer_list_capture(camera->codec_h264, src, 1.0, V4L2_PIX_FMT_H264, true) < 0) {
     return -1;
   }
 
diff --git a/hw/device.c b/hw/device.c
index 6b68944..7f6505a 100644
--- a/hw/device.c
+++ b/hw/device.c
@@ -49,26 +49,23 @@ void device_close(device_t *dev) {
   free(dev);
 }
 
-int device_open_buffer_list(device_t *dev, bool do_capture, unsigned width, unsigned height, unsigned format, unsigned bytesperline, int nbufs)
+int device_open_buffer_list(device_t *dev, bool do_capture, unsigned width, unsigned height, unsigned format, unsigned bytesperline, int nbufs, bool do_mmap)
 {
   unsigned type;
   char name[64];
   struct buffer_list_s **buf_list = NULL;
-  bool do_mmap = false;
 
   if (!dev) {
     return -1;
   }
 
+  if (!dev->allow_dma) {
+    do_mmap = true;
+  }
+
   if (do_capture) {
     buf_list = &dev->capture_list;
 
-    if (dev->buf_sink) {
-      do_mmap = true;
-    } else {
-      do_mmap = dev->allow_dma;
-    }
-
     if (dev->capture_list) {
       E_LOG_ERROR(dev, "The capture_list is already created.");
     }
@@ -84,7 +81,6 @@ int device_open_buffer_list(device_t *dev, bool do_capture, unsigned width, unsi
     }
   } else {
     buf_list = &dev->output_list;
-    do_mmap = !dev->allow_dma;
 
     if (dev->output_list) {
       E_LOG_ERROR(dev, "The output_list is already created.");
@@ -122,6 +118,20 @@ error:
   return -1;
 }
 
+int device_open_buffer_list_output(device_t *dev, buffer_list_t *capture_list)
+{
+  return device_open_buffer_list(dev, false,
+    capture_list->fmt_width, capture_list->fmt_height,
+    capture_list->fmt_format, capture_list->fmt_bytesperline, capture_list->nbufs, !capture_list->do_mmap);
+}
+
+int device_open_buffer_list_capture(device_t *dev, buffer_list_t *output_list, float div, unsigned format, bool do_mmap)
+{
+  return device_open_buffer_list(dev, true,
+    output_list->fmt_width / div, output_list->fmt_height / div,
+    format, 0, output_list->nbufs, do_mmap);
+}
+
 int device_stream(device_t *dev, bool do_on)
 {
   if (dev->capture_list) {
diff --git a/hw/device.h b/hw/device.h
index 60cdea5..599a0fa 100644
--- a/hw/device.h
+++ b/hw/device.h
@@ -8,7 +8,6 @@ typedef struct device_s {
   int fd;
   struct v4l2_capability v4l2_cap;
   bool allow_dma;
-  bool buf_sink;
 
   struct buffer_list_s *capture_list;
   struct buffer_list_s *output_list;
@@ -20,7 +19,9 @@ typedef struct device_s {
 device_t *device_open(const char *name, const char *path);
 void device_close(device_t *device);
 
-int device_open_buffer_list(device_t *dev, bool do_capture, unsigned width, unsigned height, unsigned format, unsigned bytesperline, int nbufs);
+int device_open_buffer_list(device_t *dev, bool do_capture, unsigned width, unsigned height, unsigned format, unsigned bytesperline, int nbufs, bool do_mmap);
+int device_open_buffer_list_output(device_t *dev, struct buffer_list_s *capture_list);
+int device_open_buffer_list_capture(device_t *dev, struct buffer_list_s *output_list, float div, unsigned format, bool do_mmap);
 int device_consume_event(device_t *device);
 
 int device_stream(device_t *dev, bool do_on);