avcodec: add avcodec_chroma_pos_to_enum()

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

doc/APIchanges

@@ -15,6 +15,10 @@ libavutil:     2012-10-22
 
 API changes, most recent first:
 
+2013-07-XX - xxxxxxx - XXXXXXXXXXXXXX - avcodec.h
+  Add avcodec_chroma_pos_to_enum()
+  Add avcodec_enum_to_chroma_pos()
+
 2013-07-03 - xxxxxxx - lavfi 3.78.100 - avfilter.h
   Deprecate avfilter_graph_parse() in favor of the equivalent
   avfilter_graph_parse_ptr().

libavcodec/avcodec.h

@@ -3617,6 +3617,17 @@ void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
  */
 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
 
+/**
+ * Converts swscale x/y chroma position to AVChromaLocation.
+ *
+ * The positions represent the chroma (0,0) position in a coordinates system
+ * with luma (0,0) representing the origin and luma(1,1) representing 256,256
+ *
+ * @param xpos  horizontal chroma sample position
+ * @param ypos  vertical   chroma sample position
+ */
+enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
+
 #if FF_API_OLD_DECODE_AUDIO
 /**
  * Wrapper function which calls avcodec_decode_audio4.

libavcodec/utils.c

@@ -350,6 +350,17 @@ int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos)
     return 0;
 }
 
+enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos)
+{
+    int pos, xout, yout;
+
+    for (pos = AVCHROMA_LOC_UNSPECIFIED + 1; pos < AVCHROMA_LOC_NB; pos++) {
+        if (avcodec_enum_to_chroma_pos(&xout, &yout, pos) == 0 && xout == xpos && yout == ypos)
+            return pos;
+    }
+    return AVCHROMA_LOC_UNSPECIFIED;
+}
+
 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
                              enum AVSampleFormat sample_fmt, const uint8_t *buf,
                              int buf_size, int align)

libavcodec/version.h

@@ -29,8 +29,8 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVCODEC_VERSION_MAJOR 55
-#define LIBAVCODEC_VERSION_MINOR  18
-#define LIBAVCODEC_VERSION_MICRO 102
+#define LIBAVCODEC_VERSION_MINOR  19
+#define LIBAVCODEC_VERSION_MICRO 100
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
                                                LIBAVCODEC_VERSION_MINOR, \