Merge commit '1155fd02ae7bac215acab316e847c6bb25f74fc3'

* commit '1155fd02ae7bac215acab316e847c6bb25f74fc3':
  frame: add a convenience function for copying AVFrame data

Conflicts:
	doc/APIchanges
	libavutil/frame.c
	libavutil/version.h

Merged-by: Michael Niedermayer <michaelni@gmx.at>

4 files changed, 84 insertions, 19 deletions

diff --git a/doc/APIchanges b/doc/APIchanges
index c9464d8e95..0f6aed3d9b 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -15,6 +15,9 @@ libavutil:     2012-10-22
 
 API changes, most recent first:
 
+2014-xx-xx - xxxxxxx - lavu 53.05.0 - frame.h
+  Add av_frame_copy() for copying the frame data.
+
 2014-02-xx - xxxxxxx - lswr 0.18.100 - swresample.h
   Add swr_is_initialized() for checking whether a resample context is initialized.
 
diff --git a/libavutil/frame.c b/libavutil/frame.c
index 75a1c28347..9b4ecfcc0f 100644
--- a/libavutil/frame.c
+++ b/libavutil/frame.c
@@ -271,16 +271,11 @@ int av_frame_ref(AVFrame *dst, const AVFrame *src)
         if (ret < 0)
             return ret;
 
-        if (src->nb_samples) {
-            int ch = src->channels;
-            CHECK_CHANNELS_CONSISTENCY(src);
-            av_samples_copy(dst->extended_data, src->extended_data, 0, 0,
-                            dst->nb_samples, ch, dst->format);
-        } else {
-            av_image_copy(dst->data, dst->linesize, src->data, src->linesize,
-                          dst->format, dst->width, dst->height);
-        }
-        return 0;
+        ret = av_frame_copy(dst, src);
+        if (ret < 0)
+            av_frame_unref(dst);
+
+        return ret;
     }
 
     /* ref the buffers */
@@ -424,14 +419,10 @@ int av_frame_make_writable(AVFrame *frame)
     if (ret < 0)
         return ret;
 
-    if (tmp.nb_samples) {
-        int ch = tmp.channels;
-        CHECK_CHANNELS_CONSISTENCY(&tmp);
-        av_samples_copy(tmp.extended_data, frame->extended_data, 0, 0,
-                        frame->nb_samples, ch, frame->format);
-    } else {
-        av_image_copy(tmp.data, tmp.linesize, frame->data, frame->linesize,
-                      frame->format, frame->width, frame->height);
+    ret = av_frame_copy(&tmp, frame);
+    if (ret < 0) {
+        av_frame_unref(&tmp);
+        return ret;
     }
 
     ret = av_frame_copy_props(&tmp, frame);
@@ -592,3 +583,61 @@ AVFrameSideData *av_frame_get_side_data(const AVFrame *frame,
     }
     return NULL;
 }
+
+static int frame_copy_video(AVFrame *dst, const AVFrame *src)
+{
+    const uint8_t *src_data[4];
+    int i, planes;
+
+    if (dst->width  != src->width ||
+        dst->height != src->height)
+        return AVERROR(EINVAL);
+
+    planes = av_pix_fmt_count_planes(dst->format);
+    for (i = 0; i < planes; i++)
+        if (!dst->data[i] || !src->data[i])
+            return AVERROR(EINVAL);
+
+    memcpy(src_data, src->data, sizeof(src_data));
+    av_image_copy(dst->data, dst->linesize,
+                  src_data, src->linesize,
+                  dst->format, dst->width, dst->height);
+
+    return 0;
+}
+
+static int frame_copy_audio(AVFrame *dst, const AVFrame *src)
+{
+    int planar   = av_sample_fmt_is_planar(dst->format);
+    int channels = dst->channels;
+    int planes   = planar ? channels : 1;
+    int i;
+
+    if (dst->nb_samples     != src->nb_samples ||
+        dst->channel_layout != src->channel_layout)
+        return AVERROR(EINVAL);
+
+    CHECK_CHANNELS_CONSISTENCY(src);
+
+    for (i = 0; i < planes; i++)
+        if (!dst->extended_data[i] || !src->extended_data[i])
+            return AVERROR(EINVAL);
+
+    av_samples_copy(dst->extended_data, src->extended_data, 0, 0,
+                    dst->nb_samples, channels, dst->format);
+
+    return 0;
+}
+
+int av_frame_copy(AVFrame *dst, const AVFrame *src)
+{
+    if (dst->format != src->format || dst->format < 0)
+        return AVERROR(EINVAL);
+
+    if (dst->width > 0 && dst->height > 0)
+        return frame_copy_video(dst, src);
+    else if (dst->nb_samples > 0 && dst->channel_layout)
+        return frame_copy_audio(dst, src);
+
+    return AVERROR(EINVAL);
+}
diff --git a/libavutil/frame.h b/libavutil/frame.h
index b423f67996..0cb5fb72ae 100644
--- a/libavutil/frame.h
+++ b/libavutil/frame.h
@@ -674,6 +674,19 @@ int av_frame_is_writable(AVFrame *frame);
 int av_frame_make_writable(AVFrame *frame);
 
 /**
+ * Copy the frame data from src to dst.
+ *
+ * This function does not allocate anything, dst must be already initialized and
+ * allocated with the same parameters as src.
+ *
+ * This function only copies the frame data (i.e. the contents of the data /
+ * extended data arrays), not any other properties.
+ *
+ * @return >= 0 on success, a negative AVERROR on error.
+ */
+int av_frame_copy(AVFrame *dst, const AVFrame *src);
+
+/**
  * Copy only "metadata" fields from src to dst.
  *
  * Metadata for the purpose of this function are those fields that do not affect
diff --git a/libavutil/version.h b/libavutil/version.h
index e3b822c01f..7f093cd583 100644
--- a/libavutil/version.h
+++ b/libavutil/version.h
@@ -56,7 +56,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  52
-#define LIBAVUTIL_VERSION_MINOR  65
+#define LIBAVUTIL_VERSION_MINOR  66
 #define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \