From 80749da1668bf93b73fdb4c54b7b2834ff4fa19b Mon Sep 17 00:00:00 2001
From: Carl-Anton Ingmarsson <ca.ingmarsson@gmail.com>
Date: Thu, 17 Jun 2010 15:20:03 +0200
Subject: [PATCH] vdpau: change gst_vdp_video_src_pad_get_device behaviour

it now creates the device if it's not available
---
 sys/vdpau/gstvdp/gstvdpvideosrcpad.c | 78 ++++++++++++++++++++++++++--
 sys/vdpau/gstvdp/gstvdpvideosrcpad.h |  2 +-
 sys/vdpau/mpeg/gstvdpmpegdec.c       | 12 +++--
 3 files changed, 82 insertions(+), 10 deletions(-)

diff --git a/sys/vdpau/gstvdp/gstvdpvideosrcpad.c b/sys/vdpau/gstvdp/gstvdpvideosrcpad.c
index 1ce4aad2c6..167c4d7903 100644
--- a/sys/vdpau/gstvdp/gstvdpvideosrcpad.c
+++ b/sys/vdpau/gstvdp/gstvdpvideosrcpad.c
@@ -142,6 +142,23 @@ gst_vdp_video_src_pad_update_caps (GstVdpVideoSrcPad * vdp_pad)
     vdp_pad->caps = caps;
 }
 
+static gboolean
+gst_vdp_video_src_pad_open_device (GstVdpVideoSrcPad * vdp_pad, GError ** error)
+{
+  GstVdpDevice *device;
+
+  vdp_pad->device = device = gst_vdp_get_device (vdp_pad->display);
+  if (G_UNLIKELY (!vdp_pad->device))
+    goto device_error;
+
+  return TRUE;
+
+device_error:
+  g_set_error (error, GST_RESOURCE_ERROR, GST_RESOURCE_ERROR_OPEN_READ,
+      "Couldn't create GstVdpDevice");
+  return FALSE;
+}
+
 GstFlowReturn
 gst_vdp_video_src_pad_alloc_buffer (GstVdpVideoSrcPad * vdp_pad,
     GstVdpVideoBuffer ** video_buf)
@@ -159,8 +176,7 @@ gst_vdp_video_src_pad_alloc_buffer (GstVdpVideoSrcPad * vdp_pad,
     GstVdpDevice *device;
 
     if (G_UNLIKELY (!vdp_pad->device)) {
-      vdp_pad->device = gst_vdp_get_device (vdp_pad->display);
-      if (G_UNLIKELY (!vdp_pad->device))
+      if (!gst_vdp_video_src_pad_open_device (vdp_pad, NULL))
         goto device_error;
 
       gst_vdp_video_src_pad_update_caps (vdp_pad);
@@ -233,12 +249,64 @@ gst_vdp_video_src_pad_setcaps (GstPad * pad, GstCaps * caps)
   return TRUE;
 }
 
-GstVdpDevice *
-gst_vdp_video_src_pad_get_device (GstVdpVideoSrcPad * vdp_pad)
+GstFlowReturn
+gst_vdp_video_src_pad_get_device (GstVdpVideoSrcPad * vdp_pad,
+    GstVdpDevice ** device, GError ** error)
 {
   g_return_val_if_fail (GST_IS_VDP_VIDEO_SRC_PAD (vdp_pad), FALSE);
 
-  return vdp_pad->device;
+  if (!GST_PAD_CAPS (vdp_pad))
+    return GST_FLOW_NOT_NEGOTIATED;
+
+  if (G_UNLIKELY (!vdp_pad->device)) {
+
+    if (vdp_pad->yuv_output) {
+      if (!gst_vdp_video_src_pad_open_device (vdp_pad, error))
+        return GST_FLOW_ERROR;
+    }
+
+    else {
+      GstFlowReturn ret;
+      GstBuffer *buf;
+
+      ret = gst_pad_alloc_buffer (GST_PAD (vdp_pad), 0, 0,
+          GST_PAD_CAPS (vdp_pad), &buf);
+      if (ret != GST_FLOW_OK)
+        goto alloc_failed;
+
+      if (!gst_caps_is_equal_fixed (GST_PAD_CAPS (vdp_pad),
+              GST_BUFFER_CAPS (buf))) {
+        gst_buffer_unref (buf);
+        goto wrong_caps;
+      }
+      if (!GST_IS_VDP_VIDEO_BUFFER (buf)) {
+        gst_buffer_unref (buf);
+        goto invalid_buffer;
+      }
+
+      vdp_pad->device = g_object_ref (GST_VDP_VIDEO_BUFFER (buf)->device);
+    }
+
+    gst_vdp_video_src_pad_update_caps (vdp_pad);
+  }
+
+  *device = vdp_pad->device;
+  return GST_FLOW_OK;
+
+alloc_failed:
+  g_set_error (error, GST_STREAM_ERROR, GST_STREAM_ERROR_FAILED,
+      "Couldn't allocate buffer");
+  return GST_FLOW_ERROR;
+
+wrong_caps:
+  g_set_error (error, GST_STREAM_ERROR, GST_STREAM_ERROR_FAILED,
+      "Sink element returned buffer with wrong caps");
+  return GST_FLOW_ERROR;
+
+invalid_buffer:
+  g_set_error (error, GST_STREAM_ERROR, GST_STREAM_ERROR_FAILED,
+      "Sink element returned invalid buffer type");
+  return GST_FLOW_ERROR;
 }
 
 static GstCaps *
diff --git a/sys/vdpau/gstvdp/gstvdpvideosrcpad.h b/sys/vdpau/gstvdp/gstvdpvideosrcpad.h
index 1a32c62351..427658b81a 100644
--- a/sys/vdpau/gstvdp/gstvdpvideosrcpad.h
+++ b/sys/vdpau/gstvdp/gstvdpvideosrcpad.h
@@ -41,7 +41,7 @@ typedef struct _GstVdpVideoSrcPadClass GstVdpVideoSrcPadClass;
 GstFlowReturn gst_vdp_video_src_pad_push (GstVdpVideoSrcPad *vdp_pad, GstVdpVideoBuffer *video_buf);
 GstFlowReturn gst_vdp_video_src_pad_alloc_buffer (GstVdpVideoSrcPad *vdp_pad, GstVdpVideoBuffer **video_buf);
 
-GstVdpDevice *gst_vdp_video_src_pad_get_device (GstVdpVideoSrcPad *vdp_pad);
+GstFlowReturn gst_vdp_video_src_pad_get_device (GstVdpVideoSrcPad * vdp_pad, GstVdpDevice ** device, GError ** error);
 
 GstCaps *gst_vdp_video_src_pad_get_template_caps ();
 
diff --git a/sys/vdpau/mpeg/gstvdpmpegdec.c b/sys/vdpau/mpeg/gstvdpmpegdec.c
index b2d77706fa..f318704329 100644
--- a/sys/vdpau/mpeg/gstvdpmpegdec.c
+++ b/sys/vdpau/mpeg/gstvdpmpegdec.c
@@ -245,12 +245,14 @@ gst_vdp_mpeg_dec_handle_quant_matrix (GstVdpMpegDec * mpeg_dec,
 static gboolean
 gst_vdp_mpeg_dec_create_decoder (GstVdpMpegDec * mpeg_dec)
 {
+  GstFlowReturn ret;
   GstVdpDevice *device;
 
-  device = gst_vdp_video_src_pad_get_device
-      (GST_VDP_VIDEO_SRC_PAD (GST_BASE_VIDEO_DECODER_SRC_PAD (mpeg_dec)));
+  ret = gst_vdp_video_src_pad_get_device
+      (GST_VDP_VIDEO_SRC_PAD (GST_BASE_VIDEO_DECODER_SRC_PAD (mpeg_dec)),
+      &device, NULL);
 
-  if (device) {
+  if (ret == GST_FLOW_OK) {
     VdpStatus status;
     GstVdpMpegStreamInfo *stream_info;
 
@@ -722,13 +724,15 @@ gst_vdp_mpeg_dec_stop (GstBaseVideoDecoder * base_video_decoder)
   GstVdpMpegDec *mpeg_dec = GST_VDP_MPEG_DEC (base_video_decoder);
 
   GstVdpVideoSrcPad *vdp_pad;
+  GstFlowReturn ret;
   GstVdpDevice *device;
 
   vdp_pad =
       GST_VDP_VIDEO_SRC_PAD (GST_BASE_VIDEO_DECODER_SRC_PAD
       (base_video_decoder));
 
-  if ((device = gst_vdp_video_src_pad_get_device (vdp_pad))) {
+  ret = gst_vdp_video_src_pad_get_device (vdp_pad, &device, NULL);
+  if (ret == GST_FLOW_OK) {
 
     if (mpeg_dec->decoder != VDP_INVALID_HANDLE)
       device->vdp_decoder_destroy (mpeg_dec->decoder);