avcodec/avcodec, options_table: Deprecate sub_text_format

Unused since 1f63665ca567fbc49fa80166d468a822c2999efa.

Found-by: Soft Works <softworkz@hotmail.com>
Reviewed-by: Soft Works <softworkz@hotmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

doc/APIchanges

@@ -14,6 +14,10 @@ libavutil:     2021-04-27
 
 API changes, most recent first:
 
+2021-09-20 - xxxxxxxxxx - lavc 59.9.100 - avcodec.h
+  Deprecate AVCodecContext.sub_text_format and the corresponding
+  AVOptions. It is unused since the last major bump.
+
 2021-09-20 - xxxxxxxxxx - lavc 59.8.100 - avcodec.h codec.h
   Deprecate AV_CODEC_FLAG_TRUNCATED and AV_CODEC_CAP_TRUNCATED,
   as they are redundant with parsers.

libavcodec/avcodec.h

@@ -1857,13 +1857,14 @@ typedef struct AVCodecContext {
      */
     AVBufferRef *hw_frames_ctx;
 
+#if FF_API_SUB_TEXT_FORMAT
     /**
-     * Control the form of AVSubtitle.rects[N]->ass
-     * - decoding: set by user
-     * - encoding: unused
+     * @deprecated unused
      */
+    attribute_deprecated
     int sub_text_format;
 #define FF_SUB_TEXT_FMT_ASS              0
+#endif
 
     /**
      * Audio only. The amount of padding (in samples) appended by the encoder to

libavcodec/options_table.h

@@ -368,8 +368,10 @@ static const AVOption avcodec_options[] = {
 {"auto",        NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_SUB_CHARENC_MODE_AUTOMATIC},   INT_MIN, INT_MAX, S|D, "sub_charenc_mode"},
 {"pre_decoder", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_SUB_CHARENC_MODE_PRE_DECODER}, INT_MIN, INT_MAX, S|D, "sub_charenc_mode"},
 {"ignore",      NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_SUB_CHARENC_MODE_IGNORE},      INT_MIN, INT_MAX, S|D, "sub_charenc_mode"},
-{"sub_text_format", "set decoded text subtitle format", OFFSET(sub_text_format), AV_OPT_TYPE_INT, {.i64 = FF_SUB_TEXT_FMT_ASS}, 0, 1, S|D, "sub_text_format"},
+#if FF_API_SUB_TEXT_FORMAT
+{"sub_text_format", "Deprecated, does nothing", OFFSET(sub_text_format), AV_OPT_TYPE_INT, {.i64 = FF_SUB_TEXT_FMT_ASS}, 0, 1, S|D | AV_OPT_FLAG_DEPRECATED, "sub_text_format"},
 {"ass",              NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_SUB_TEXT_FMT_ASS},              INT_MIN, INT_MAX, S|D, "sub_text_format"},
+#endif
 {"apply_cropping", NULL, OFFSET(apply_cropping), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, V | D },
 {"skip_alpha", "Skip processing alpha", OFFSET(skip_alpha), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, V|D },
 {"field_order", "Field order", OFFSET(field_order), AV_OPT_TYPE_INT, {.i64 = AV_FIELD_UNKNOWN }, 0, 5, V|D|E, "field_order" },

libavcodec/version.h

@@ -28,7 +28,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVCODEC_VERSION_MAJOR  59
-#define LIBAVCODEC_VERSION_MINOR   8
+#define LIBAVCODEC_VERSION_MINOR   9
 #define LIBAVCODEC_VERSION_MICRO 100
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
@@ -84,5 +84,8 @@
 #ifndef FF_API_FLAG_TRUNCATED
 #define FF_API_FLAG_TRUNCATED      (LIBAVCODEC_VERSION_MAJOR < 60)
 #endif
+#ifndef FF_API_SUB_TEXT_FORMAT
+#define FF_API_SUB_TEXT_FORMAT     (LIBAVCODEC_VERSION_MAJOR < 60)
+#endif
 
 #endif /* AVCODEC_VERSION_H */