video: remove useless mp_imgfmt_desc.avformat field

Had 1 user; easily replaced.

video/img_format.c

@@ -41,7 +41,6 @@ struct mp_imgfmt_entry {
     //  - sets MP_IMGFLAG_HAS_COMPS|MP_IMGFLAG_NE if num_planes>0
     //  - sets MP_IMGFLAG_TYPE_UINT if no other type set
     //  - sets id to mp_imgfmt_list[] implied format
-    //  - sets avformat to AV_PIX_FMT_NONE
     struct mp_imgfmt_desc desc;
 };
 
@@ -395,7 +394,6 @@ static bool mp_imgfmt_get_desc_from_pixdesc(int mpfmt, struct mp_imgfmt_desc *ou
 
     struct mp_imgfmt_desc desc = {
         .id = mpfmt,
-        .avformat = fmt,
         .chroma_xs = pd->log2_chroma_w,
         .chroma_ys = pd->log2_chroma_h,
     };
@@ -507,7 +505,6 @@ static bool get_native_desc(int mpfmt, struct mp_imgfmt_desc *desc)
     // Fill in some fields mp_imgfmt_entry.desc is not required to set.
 
     desc->id = mpfmt;
-    desc->avformat = AV_PIX_FMT_NONE;
 
     for (int n = 0; n < MP_NUM_COMPONENTS; n++) {
         struct mp_imgfmt_comp_desc *cd = &desc->comps[n];

video/img_format.h

@@ -118,7 +118,6 @@ struct mp_imgfmt_comp_desc {
 
 struct mp_imgfmt_desc {
     int id;                 // IMGFMT_*
-    int avformat;           // AV_PIX_FMT_* (or AV_PIX_FMT_NONE)
     int flags;              // MP_IMGFLAG_* bitfield
     int8_t num_planes;
     int8_t chroma_xs, chroma_ys; // chroma shift (i.e. log2 of chroma pixel size)

video/sws_utils.c

@@ -393,9 +393,10 @@ static const int endian_swaps[][2] = {
 // might reduce the effective bit depth in some cases.
 struct mp_image *mp_img_swap_to_native(struct mp_image *img)
 {
+    int avfmt = imgfmt2pixfmt(img->imgfmt);
     int to = AV_PIX_FMT_NONE;
     for (int n = 0; endian_swaps[n][0] != AV_PIX_FMT_NONE; n++) {
-        if (endian_swaps[n][0] == img->fmt.avformat)
+        if (endian_swaps[n][0] == avfmt)
             to = endian_swaps[n][1];
     }
     if (to == AV_PIX_FMT_NONE || !mp_image_make_writeable(img))