Revert "lavc: deprecate avcodec_dct, av_fft, av_dct, av_rdft and av_mdct"

There are sill many users of these APIs within libav*, so this commit
introduced too many deprecation warnings, making compilation too noisy and
potentially hiding legit warnings.
Once the remaining users are ported, this can be reapplied.

This reverts commit 76d0038579.

doc/APIchanges

@@ -14,10 +14,6 @@ libavutil:     2021-04-27
 
 API changes, most recent first:
 
-2022-11-06 - xxxxxxxxxx - lavc 59.52.100 - avdct.h avfft.h
-  Deprecate avcodec_dct, av_dct, av_rdft, av_fft and av_mdct.
-  Replaced by libavutil/tx.h
-
 2022-xx-xx - xxxxxxxxxx - lavu 57.42.100 - dict.h
   Add av_dict_iterate().
 

libavcodec/avdct.h

@@ -19,7 +19,6 @@
 #ifndef AVCODEC_AVDCT_H
 #define AVCODEC_AVDCT_H
 
-#include "libavutil/attributes.h"
 #include "libavutil/opt.h"
 
 /**
@@ -27,7 +26,7 @@
  * @note function pointers can be NULL if the specific features have been
  *       disabled at build time.
  */
-typedef struct attribute_deprecated AVDCT {
+typedef struct AVDCT {
     const AVClass *av_class;
 
     void (*idct)(int16_t *block /* align 16 */);
@@ -81,13 +80,9 @@ typedef struct attribute_deprecated AVDCT {
  *
  * To free it use av_free()
  */
-attribute_deprecated
 AVDCT *avcodec_dct_alloc(void);
-
-attribute_deprecated
 int avcodec_dct_init(AVDCT *);
 
-attribute_deprecated
 const AVClass *avcodec_dct_get_class(void);
 
 #endif /* AVCODEC_AVDCT_H */

libavcodec/avfft.h

@@ -19,8 +19,6 @@
 #ifndef AVCODEC_AVFFT_H
 #define AVCODEC_AVFFT_H
 
-#include "libavutil/attributes.h"
-
 /**
  * @file
  * @ingroup lavc_fft
@@ -34,83 +32,65 @@
  * @{
  */
 
-typedef float attribute_deprecated FFTSample;
+typedef float FFTSample;
 
-typedef struct attribute_deprecated FFTComplex {
+typedef struct FFTComplex {
     FFTSample re, im;
 } FFTComplex;
 
-typedef struct attribute_deprecated FFTContext FFTContext;
+typedef struct FFTContext FFTContext;
 
 /**
  * Set up a complex FFT.
  * @param nbits           log2 of the length of the input array
  * @param inverse         if 0 perform the forward transform, if 1 perform the inverse
  */
-attribute_deprecated
 FFTContext *av_fft_init(int nbits, int inverse);
 
 /**
  * Do the permutation needed BEFORE calling ff_fft_calc().
  */
-attribute_deprecated
 void av_fft_permute(FFTContext *s, FFTComplex *z);
 
 /**
  * Do a complex FFT with the parameters defined in av_fft_init(). The
  * input data must be permuted before. No 1.0/sqrt(n) normalization is done.
  */
-attribute_deprecated
 void av_fft_calc(FFTContext *s, FFTComplex *z);
 
-attribute_deprecated
 void av_fft_end(FFTContext *s);
 
-attribute_deprecated
 FFTContext *av_mdct_init(int nbits, int inverse, double scale);
-
-attribute_deprecated
 void av_imdct_calc(FFTContext *s, FFTSample *output, const FFTSample *input);
-
-attribute_deprecated
 void av_imdct_half(FFTContext *s, FFTSample *output, const FFTSample *input);
-
-attribute_deprecated
 void av_mdct_calc(FFTContext *s, FFTSample *output, const FFTSample *input);
-
-attribute_deprecated
 void av_mdct_end(FFTContext *s);
 
 /* Real Discrete Fourier Transform */
 
-enum attribute_deprecated RDFTransformType {
+enum RDFTransformType {
     DFT_R2C,
     IDFT_C2R,
     IDFT_R2C,
     DFT_C2R,
 };
 
-typedef struct attribute_deprecated RDFTContext RDFTContext;
+typedef struct RDFTContext RDFTContext;
 
 /**
  * Set up a real FFT.
  * @param nbits           log2 of the length of the input array
  * @param trans           the type of transform
  */
-attribute_deprecated
 RDFTContext *av_rdft_init(int nbits, enum RDFTransformType trans);
-
-attribute_deprecated
 void av_rdft_calc(RDFTContext *s, FFTSample *data);
-
-attribute_deprecated
 void av_rdft_end(RDFTContext *s);
 
 /* Discrete Cosine Transform */
 
-typedef struct attribute_deprecated DCTContext DCTContext;
+typedef struct DCTContext DCTContext;
 
-enum attribute_deprecated DCTTransformType {
+enum DCTTransformType {
     DCT_II = 0,
     DCT_III,
     DCT_I,
@@ -127,13 +107,8 @@ enum attribute_deprecated DCTTransformType {
  *
  * @note the first element of the input of DST-I is ignored
  */
-attribute_deprecated
 DCTContext *av_dct_init(int nbits, enum DCTTransformType type);
-
-attribute_deprecated
 void av_dct_calc(DCTContext *s, FFTSample *data);
-
-attribute_deprecated
 void av_dct_end (DCTContext *s);
 
 /**