targeenc: fix rgb555 encoding on big endian systems.

Patch by Alexis Ballier gmail_address(name, surname)

Originally committed as revision 22320 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/targaenc.c

@@ -104,7 +104,7 @@ static int targa_encode_frame(AVCodecContext *avctx,
         outbuf[2] = 3;           /* uncompressed grayscale image */
         outbuf[16] = 8;          /* bpp */
         break;
-    case PIX_FMT_RGB555:
+    case PIX_FMT_RGB555LE:
         outbuf[2] = 2;           /* uncompresses true-color image */
         outbuf[16] = 16;         /* bpp */
         break;
@@ -158,6 +158,6 @@ AVCodec targa_encoder = {
     .priv_data_size = sizeof(TargaContext),
     .init = targa_encode_init,
     .encode = targa_encode_frame,
-    .pix_fmts= (const enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_RGB555, PIX_FMT_GRAY8, PIX_FMT_NONE},
+    .pix_fmts= (const enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_RGB555LE, PIX_FMT_GRAY8, PIX_FMT_NONE},
     .long_name= NULL_IF_CONFIG_SMALL("Truevision Targa image"),
 };