From 3c1ccb64eb77e8e75b44d4816de80df3e2b9c83f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebastian@centricular.com>
Date: Fri, 19 Sep 2014 14:36:39 +0300
Subject: [PATCH] vtenc: Fix encoder to work on iOS

iOS has special stride requirements that we don't know yet, so copy
input buffers into buffers allocated by iOS for now.

Later we should check the stride and probably provide a buffer pool for these
buffers so upstream can directly write in there.
---
 sys/applemedia/vtenc.c | 66 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 65 insertions(+), 1 deletion(-)

diff --git a/sys/applemedia/vtenc.c b/sys/applemedia/vtenc.c
index 55ed9eb525..707b29aa16 100644
--- a/sys/applemedia/vtenc.c
+++ b/sys/applemedia/vtenc.c
@@ -17,10 +17,14 @@
  * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
 
 #include "vtenc.h"
 
 #include "coremediabuffer.h"
+#include "corevideobuffer.h"
 #include "vtutil.h"
 
 #define VTENC_DEFAULT_USAGE       6     /* Profile: Baseline  Level: 2.1 */
@@ -92,6 +96,7 @@ static void gst_vtenc_enqueue_buffer (void *outputCallbackRefCon,
 static gboolean gst_vtenc_buffer_is_keyframe (GstVTEnc * self,
     CMSampleBufferRef sbuf);
 
+#ifndef HAVE_IOS
 static GstVTEncFrame *gst_vtenc_frame_new (GstBuffer * buf,
     GstVideoInfo * videoinfo);
 static void gst_vtenc_frame_free (GstVTEncFrame * frame);
@@ -99,6 +104,7 @@ static void gst_vtenc_frame_free (GstVTEncFrame * frame);
 static void gst_pixel_buffer_release_cb (void *releaseRefCon,
     const void *dataPtr, size_t dataSize, size_t numberOfPlanes,
     const void *planeAddresses[]);
+#endif
 
 static GstStaticCaps sink_caps =
 GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("{ NV12, I420 }"));
@@ -676,7 +682,63 @@ gst_vtenc_encode_frame (GstVTEnc * self, GstVideoCodecFrame * frame)
   if (meta != NULL) {
     pbuf = gst_core_media_buffer_get_pixel_buffer (frame->input_buffer);
   }
+#ifdef HAVE_IOS
+  if (pbuf == NULL) {
+    GstVideoFrame inframe, outframe;
+    GstBuffer *outbuf;
+    OSType pixel_format_type;
+    CVReturn cv_ret;
 
+    /* FIXME: iOS has special stride requirements that we don't know yet.
+     * Copy into a newly allocated pixelbuffer for now. Probably makes
+     * sense to create a buffer pool around these at some point.
+     */
+
+    switch (GST_VIDEO_INFO_FORMAT (&self->video_info)) {
+      case GST_VIDEO_FORMAT_I420:
+        pixel_format_type = kCVPixelFormatType_420YpCbCr8Planar;
+        break;
+      case GST_VIDEO_FORMAT_NV12:
+        pixel_format_type = kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange;
+        break;
+      default:
+        goto cv_error;
+    }
+
+    if (!gst_video_frame_map (&inframe, &self->video_info, frame->input_buffer,
+            GST_MAP_READ))
+      goto cv_error;
+
+    cv_ret =
+        CVPixelBufferCreate (NULL, self->negotiated_width,
+        self->negotiated_height, pixel_format_type, NULL, &pbuf);
+
+    if (cv_ret != kCVReturnSuccess) {
+      gst_video_frame_unmap (&inframe);
+      goto cv_error;
+    }
+
+    outbuf = gst_core_video_buffer_new ((CVBufferRef) pbuf, &self->video_info);
+    if (!gst_video_frame_map (&outframe, &self->video_info, outbuf,
+            GST_MAP_WRITE)) {
+      gst_video_frame_unmap (&inframe);
+      gst_buffer_unref (outbuf);
+      CVPixelBufferRelease (pbuf);
+      goto cv_error;
+    }
+
+    if (!gst_video_frame_copy (&outframe, &inframe)) {
+      gst_video_frame_unmap (&inframe);
+      gst_buffer_unref (outbuf);
+      CVPixelBufferRelease (pbuf);
+      goto cv_error;
+    }
+
+    gst_buffer_unref (outbuf);
+    gst_video_frame_unmap (&inframe);
+    gst_video_frame_unmap (&outframe);
+  }
+#else
   if (pbuf == NULL) {
     GstVTEncFrame *vframe;
     CVReturn cv_ret;
@@ -733,6 +795,7 @@ gst_vtenc_encode_frame (GstVTEnc * self, GstVideoCodecFrame * frame)
       }
     }
   }
+#endif
 
   GST_OBJECT_LOCK (self);
 
@@ -846,6 +909,7 @@ gst_vtenc_buffer_is_keyframe (GstVTEnc * self, CMSampleBufferRef sbuf)
   return result;
 }
 
+#ifndef HAVE_IOS
 static GstVTEncFrame *
 gst_vtenc_frame_new (GstBuffer * buf, GstVideoInfo * video_info)
 {
@@ -875,9 +939,9 @@ gst_pixel_buffer_release_cb (void *releaseRefCon, const void *dataPtr,
     size_t dataSize, size_t numberOfPlanes, const void *planeAddresses[])
 {
   GstVTEncFrame *frame = (GstVTEncFrame *) releaseRefCon;
-
   gst_vtenc_frame_free (frame);
 }
+#endif
 
 static void
 gst_vtenc_register (GstPlugin * plugin,