fix(generator): handle char vs uint8_t type distinction in CGO bindings

libclang on NixOS cannot locate stdint.h/inttypes.h, causing it to
resolve uint8_t typedefs to their canonical type "int". This creates
ambiguity when both 'char' and 'uint8_t' resolve to the same type,
resulting in incorrect CGO type casts.

Changes:
- Add CTypeName field to Field struct to preserve original C type
  spelling before libclang canonicalization
- Capture original type name in parser before parseType() call
- Implement fieldCTypeOverrides map for known libclang misreports
  (AVPixFmtDescriptor fields: nb_components, log2_chroma_w,
  log2_chroma_h, flags)
- Enhance getCType() with special handling for 'char' type to prevent
  incorrect uint8_t casting
- Add three-tier fallback for struct setter type resolution:
  1. Use captured CTypeName if specific
  2. Check fieldCTypeOverrides for known failures
  3. Fall back to getCType() mapping
- Attempt to preserve typedef spellings in type parser for _t suffixed
  types when libclang reports them correctly

This fixes compilation errors like:
  cannot use _Ctype_uint8_t(separator) as _Ctype_char value

Successfully resolves:
- av_match_list() char separator parameter (char → C.char)
- AVPixFmtDescriptor uint8_t fields (uint8_t → C.uint8_t)
- AVPixFmtDescriptor uint64_t flags (uint64_t → C.uint64_t)

Tested: Full build passes with pixdesc.h enabled, all tests pass

Author: flexiondotorg

callbacks.gen.go

@@ -79,6 +79,7 @@ import "unsafe"
 // #include <libavutil/murmur3.h>
 // #include <libavutil/opt.h>
 // #include <libavutil/parseutils.h>
+// #include <libavutil/pixdesc.h>
 // #include <libavutil/pixelutils.h>
 // #include <libavutil/pixfmt.h>
 // #include <libavutil/random_seed.h>

constants.gen.go

@@ -77,6 +77,7 @@ package ffmpeg
 // #include <libavutil/murmur3.h>
 // #include <libavutil/opt.h>
 // #include <libavutil/parseutils.h>
+// #include <libavutil/pixdesc.h>
 // #include <libavutil/pixelutils.h>
 // #include <libavutil/pixfmt.h>
 // #include <libavutil/random_seed.h>
@@ -2325,6 +2326,60 @@ const AVOptSerializeSearchChildren = C.AV_OPT_SERIALIZE_SEARCH_CHILDREN
 // AVOptFlagImplicitKey wraps AV_OPT_FLAG_IMPLICIT_KEY.
 const AVOptFlagImplicitKey = C.AV_OPT_FLAG_IMPLICIT_KEY
 
+// AVPixFmtFlagBe wraps AV_PIX_FMT_FLAG_BE.
+const AVPixFmtFlagBe = C.AV_PIX_FMT_FLAG_BE
+
+// AVPixFmtFlagPal wraps AV_PIX_FMT_FLAG_PAL.
+const AVPixFmtFlagPal = C.AV_PIX_FMT_FLAG_PAL
+
+// AVPixFmtFlagBitstream wraps AV_PIX_FMT_FLAG_BITSTREAM.
+const AVPixFmtFlagBitstream = C.AV_PIX_FMT_FLAG_BITSTREAM
+
+// AVPixFmtFlagHWAccel wraps AV_PIX_FMT_FLAG_HWACCEL.
+const AVPixFmtFlagHWAccel = C.AV_PIX_FMT_FLAG_HWACCEL
+
+// AVPixFmtFlagPlanar wraps AV_PIX_FMT_FLAG_PLANAR.
+const AVPixFmtFlagPlanar = C.AV_PIX_FMT_FLAG_PLANAR
+
+// AVPixFmtFlagRgb wraps AV_PIX_FMT_FLAG_RGB.
+const AVPixFmtFlagRgb = C.AV_PIX_FMT_FLAG_RGB
+
+// AVPixFmtFlagAlpha wraps AV_PIX_FMT_FLAG_ALPHA.
+const AVPixFmtFlagAlpha = C.AV_PIX_FMT_FLAG_ALPHA
+
+// AVPixFmtFlagBayer wraps AV_PIX_FMT_FLAG_BAYER.
+const AVPixFmtFlagBayer = C.AV_PIX_FMT_FLAG_BAYER
+
+// AVPixFmtFlagFloat wraps AV_PIX_FMT_FLAG_FLOAT.
+const AVPixFmtFlagFloat = C.AV_PIX_FMT_FLAG_FLOAT
+
+// AVPixFmtFlagXyz wraps AV_PIX_FMT_FLAG_XYZ.
+const AVPixFmtFlagXyz = C.AV_PIX_FMT_FLAG_XYZ
+
+// FFLossResolution wraps FF_LOSS_RESOLUTION.
+const FFLossResolution = C.FF_LOSS_RESOLUTION
+
+// FFLossDepth wraps FF_LOSS_DEPTH.
+const FFLossDepth = C.FF_LOSS_DEPTH
+
+// FFLossColorspace wraps FF_LOSS_COLORSPACE.
+const FFLossColorspace = C.FF_LOSS_COLORSPACE
+
+// FFLossAlpha wraps FF_LOSS_ALPHA.
+const FFLossAlpha = C.FF_LOSS_ALPHA
+
+// FFLossColorquant wraps FF_LOSS_COLORQUANT.
+const FFLossColorquant = C.FF_LOSS_COLORQUANT
+
+// FFLossChroma wraps FF_LOSS_CHROMA.
+const FFLossChroma = C.FF_LOSS_CHROMA
+
+// FFLossExcessResolution wraps FF_LOSS_EXCESS_RESOLUTION.
+const FFLossExcessResolution = C.FF_LOSS_EXCESS_RESOLUTION
+
+// FFLossExcessDepth wraps FF_LOSS_EXCESS_DEPTH.
+const FFLossExcessDepth = C.FF_LOSS_EXCESS_DEPTH
+
 // AVPaletteSize wraps AVPALETTE_SIZE.
 const AVPaletteSize = C.AVPALETTE_SIZE
 

enums.gen.go

@@ -79,6 +79,7 @@ import "unsafe"
 // #include <libavutil/murmur3.h>
 // #include <libavutil/opt.h>
 // #include <libavutil/parseutils.h>
+// #include <libavutil/pixdesc.h>
 // #include <libavutil/pixelutils.h>
 // #include <libavutil/pixfmt.h>
 // #include <libavutil/random_seed.h>