Merge commit 'c1eb3e7f'

* commit 'c1eb3e7f':
  swscale: add support for endianness only conversion

Conflicts:
	libswscale/utils.c
	libswscale/version.h
Merged-by: Michael Niedermayer <michaelni@gmx.at>

libswscale/swscale.h

@@ -146,6 +146,13 @@ int sws_isSupportedInput(enum AVPixelFormat pix_fmt);
  */
 int sws_isSupportedOutput(enum AVPixelFormat pix_fmt);
 
+/**
+ * @param[in]  pix_fmt the pixel format
+ * @return a positive value if an endianness conversion for pix_fmt is
+ * supported, 0 otherwise.
+ */
+int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt);
+
 /**
  * Allocate an empty SwsContext. This must be filled and passed to
  * sws_init_context(). For filling see AVOptions, options.c and

libswscale/utils.c

@@ -72,7 +72,9 @@ const char *swscale_license(void)
 #define RET 0xC3 // near return opcode for x86
 
 typedef struct FormatEntry {
-    int is_supported_in, is_supported_out;
+    uint8_t is_supported_in         :1;
+    uint8_t is_supported_out        :1;
+    uint8_t is_supported_endianness :1;
 } FormatEntry;
 
 static const FormatEntry format_entries[AV_PIX_FMT_NB] = {
@@ -215,6 +217,12 @@ int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)
            format_entries[pix_fmt].is_supported_out : 0;
 }
 
+int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)
+{
+    return (unsigned)pix_fmt < AV_PIX_FMT_NB ?
+           format_entries[pix_fmt].is_supported_endianness : 0;
+}
+
 extern const int32_t ff_yuv2rgb_coeffs[8][4];
 
 #if FF_API_SWS_FORMAT_NAME
@@ -1077,6 +1085,8 @@ av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
         c->dstFormat= dstFormat;
     }
 
+    if (!(unscaled && sws_isSupportedEndiannessConversion(srcFormat) &&
+          av_pix_fmt_swap_endianness(srcFormat) == dstFormat)) {
     if (!sws_isSupportedInput(srcFormat)) {
         av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n",
                av_get_pix_fmt_name(srcFormat));
@@ -1087,6 +1097,7 @@ av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
                av_get_pix_fmt_name(dstFormat));
         return AVERROR(EINVAL);
     }
+    }
 
     i = flags & (SWS_POINT         |
                  SWS_AREA          |

libswscale/version.h

@@ -27,7 +27,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBSWSCALE_VERSION_MAJOR 2
-#define LIBSWSCALE_VERSION_MINOR 2
+#define LIBSWSCALE_VERSION_MINOR 3
 #define LIBSWSCALE_VERSION_MICRO 100
 
 #define LIBSWSCALE_VERSION_INT  AV_VERSION_INT(LIBSWSCALE_VERSION_MAJOR, \