lavu: add av_get_pix_fmt_name() convenience function

Also deprecate avcodec_get_pix_fmt_name() in its favor.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

doc/APIchanges

@@ -13,6 +13,10 @@ libavutil:   2011-04-18
 
 API changes, most recent first:
 
+2011-05-XX - xxxxxx - lavu 51.X.0 - pixdesc.h
+  Add av_get_pix_fmt_name() in libavutil/pixdesc.h, and deprecate
+  avcodec_get_pix_fmt_name() in libavcodec/avcodec.h in its favor.
+
 2011-05-25 - 30315a8 - lavf 53.1.0 - avformat.h
   Add fps_probe_size to AVFormatContext.
 

libavcodec/avcodec.h

@@ -3306,7 +3306,15 @@ int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width,
  */
 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
+
+#if FF_API_GET_PIX_FMT_NAME
+/**
+ * @deprecated Deprecated in favor of av_get_pix_fmt_name().
+ */
+attribute_deprecated
 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
+#endif
+
 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
 
 /**

libavcodec/imgconvert.c

@@ -417,13 +417,12 @@ void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *
     *v_shift = av_pix_fmt_descriptors[pix_fmt].log2_chroma_h;
 }
 
+#if FF_API_GET_PIX_FMT_NAME
 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt)
 {
-    if ((unsigned)pix_fmt >= PIX_FMT_NB)
-        return NULL;
-    else
-        return av_pix_fmt_descriptors[pix_fmt].name;
+    return av_get_pix_fmt_name(pix_fmt);
 }
+#endif
 
 int ff_is_hwaccel_pix_fmt(enum PixelFormat pix_fmt)
 {

libavcodec/version.h

@@ -65,5 +65,8 @@
 #ifndef FF_API_FLAC_GLOBAL_OPTS
 #define FF_API_FLAC_GLOBAL_OPTS (LIBAVCODEC_VERSION_MAJOR < 54)
 #endif
+#ifndef FF_API_GET_PIX_FMT_NAME
+#define FF_API_GET_PIX_FMT_NAME (LIBAVCODEC_VERSION_MAJOR < 54)
+#endif
 
 #endif /* AVCODEC_VERSION_H */

libavutil/avutil.h

@@ -40,7 +40,7 @@
 #define AV_VERSION(a, b, c) AV_VERSION_DOT(a, b, c)
 
 #define LIBAVUTIL_VERSION_MAJOR 51
-#define LIBAVUTIL_VERSION_MINOR  1
+#define LIBAVUTIL_VERSION_MINOR  2
 #define LIBAVUTIL_VERSION_MICRO  0
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \

libavutil/pixdesc.c

@@ -906,6 +906,12 @@ static enum PixelFormat get_pix_fmt_internal(const char *name)
     return PIX_FMT_NONE;
 }
 
+const char *av_get_pix_fmt_name(enum PixelFormat pix_fmt)
+{
+    return (unsigned)pix_fmt < PIX_FMT_NB ?
+        av_pix_fmt_descriptors[pix_fmt].name : NULL;
+}
+
 #if HAVE_BIGENDIAN
 #   define X_NE(be, le) be
 #else

libavutil/pixdesc.h

@@ -23,6 +23,7 @@
 #define AVUTIL_PIXDESC_H
 
 #include <inttypes.h>
+#include "pixfmt.h"
 
 typedef struct AVComponentDescriptor{
     uint16_t plane        :2;            ///< which of the 4 planes contains the component
@@ -141,6 +142,14 @@ void av_write_image_line(const uint16_t *src, uint8_t *data[4], const int linesi
  */
 enum PixelFormat av_get_pix_fmt(const char *name);
 
+/**
+ * Return the short name for a pixel format, NULL in case pix_fmt is
+ * unknown.
+ *
+ * @see av_get_pix_fmt(), av_get_pix_fmt_string()
+ */
+const char *av_get_pix_fmt_name(enum PixelFormat pix_fmt);
+
 /**
  * Print in buf the string corresponding to the pixel format with
  * number pix_fmt, or an header if pix_fmt is negative.