avcodec/codec_internal: Add FFCodec, hide internal part of AVCodec

Up until now, codec.h contains both public and private parts
of AVCodec. This exposes the internals of AVCodec to users
and leads them into the temptation of actually using them
and forces us to forward-declare structures and types that
users can't use at all.

This commit changes this by adding a new structure FFCodec to
codec_internal.h that extends AVCodec, i.e. contains the public
AVCodec as first member; the private fields of AVCodec are moved
to this structure, leaving codec.h clean.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

1 files changed, 7 insertions, 6 deletions

diff --git a/libavcodec/txd.c b/libavcodec/txd.c
index 93e4fa9605..dec033182c 100644
--- a/libavcodec/txd.c
+++ b/libavcodec/txd.c
@@ -25,6 +25,7 @@
 #include "libavutil/imgutils.h"
 #include "bytestream.h"
 #include "avcodec.h"
+#include "codec_internal.h"
 #include "internal.h"
 #include "texturedsp.h"
 
@@ -163,11 +164,11 @@ unsupported:
     return AVERROR_PATCHWELCOME;
 }
 
-const AVCodec ff_txd_decoder = {
-    .name           = "txd",
-    .long_name      = NULL_IF_CONFIG_SMALL("Renderware TXD (TeXture Dictionary) image"),
-    .type           = AVMEDIA_TYPE_VIDEO,
-    .id             = AV_CODEC_ID_TXD,
+const FFCodec ff_txd_decoder = {
+    .p.name         = "txd",
+    .p.long_name    = NULL_IF_CONFIG_SMALL("Renderware TXD (TeXture Dictionary) image"),
+    .p.type         = AVMEDIA_TYPE_VIDEO,
+    .p.id           = AV_CODEC_ID_TXD,
+    .p.capabilities = AV_CODEC_CAP_DR1,
     .decode         = txd_decode_frame,
-    .capabilities   = AV_CODEC_CAP_DR1,
 };