diff --git a/configure b/configure
index 0d3a9e7f7f..037e86c233 100755
--- a/configure
+++ b/configure
@@ -2765,7 +2765,7 @@ rdft_select="fft"
 # decoders / encoders
 aac_decoder_select="adts_header mpeg4audio sinewin"
 aac_fixed_decoder_select="adts_header mpeg4audio"
-aac_encoder_select="audio_frame_queue iirfilter lpc mdct sinewin"
+aac_encoder_select="audio_frame_queue iirfilter lpc sinewin"
 aac_latm_decoder_select="aac_decoder aac_latm_parser"
 ac3_decoder_select="ac3_parser ac3dsp bswapdsp fmtconvert"
 ac3_fixed_decoder_select="ac3_parser ac3dsp bswapdsp"
diff --git a/libavcodec/aacenc.c b/libavcodec/aacenc.c
index 6fe738e172..5bc60c7390 100644
--- a/libavcodec/aacenc.c
+++ b/libavcodec/aacenc.c
@@ -475,15 +475,15 @@ static void apply_window_and_mdct(AACEncContext *s, SingleChannelElement *sce,
                                   float *audio)
 {
     int i;
-    const float *output = sce->ret_buf;
+    float *output = sce->ret_buf;
 
     apply_window[sce->ics.window_sequence[0]](s->fdsp, sce, audio);
 
     if (sce->ics.window_sequence[0] != EIGHT_SHORT_SEQUENCE)
-        s->mdct1024.mdct_calc(&s->mdct1024, sce->coeffs, output);
+        s->mdct1024_fn(s->mdct1024, sce->coeffs, output, sizeof(float));
     else
         for (i = 0; i < 1024; i += 128)
-            s->mdct128.mdct_calc(&s->mdct128, &sce->coeffs[i], output + i*2);
+            s->mdct128_fn(s->mdct128, &sce->coeffs[i], output + i*2, sizeof(float));
     memcpy(audio, audio + 1024, sizeof(audio[0]) * 1024);
     memcpy(sce->pcoeffs, sce->coeffs, sizeof(sce->pcoeffs));
 }
@@ -939,7 +939,7 @@ static int aac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
             if (s->options.ltp && s->coder->update_ltp) {
                 s->coder->update_ltp(s, sce);
                 apply_window[sce->ics.window_sequence[0]](s->fdsp, sce, &sce->ltp_state[0]);
-                s->mdct1024.mdct_calc(&s->mdct1024, sce->lcoeffs, sce->ret_buf);
+                s->mdct1024_fn(s->mdct1024, sce->lcoeffs, sce->ret_buf, sizeof(float));
             }
 
             for (k = 0; k < 1024; k++) {
@@ -1176,8 +1176,8 @@ static av_cold int aac_encode_end(AVCodecContext *avctx)
 
     av_log(avctx, AV_LOG_INFO, "Qavg: %.3f\n", s->lambda_count ? s->lambda_sum / s->lambda_count : NAN);
 
-    ff_mdct_end(&s->mdct1024);
-    ff_mdct_end(&s->mdct128);
+    av_tx_uninit(&s->mdct1024);
+    av_tx_uninit(&s->mdct128);
     ff_psy_end(&s->psy);
     ff_lpc_end(&s->lpc);
     if (s->psypp)
@@ -1192,6 +1192,7 @@ static av_cold int aac_encode_end(AVCodecContext *avctx)
 static av_cold int dsp_init(AVCodecContext *avctx, AACEncContext *s)
 {
     int ret = 0;
+    float scale = 32768.0f;
 
     s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
     if (!s->fdsp)
@@ -1200,9 +1201,11 @@ static av_cold int dsp_init(AVCodecContext *avctx, AACEncContext *s)
     // window init
     ff_aac_float_common_init();
 
-    if ((ret = ff_mdct_init(&s->mdct1024, 11, 0, 32768.0)) < 0)
+    if ((ret = av_tx_init(&s->mdct1024, &s->mdct1024_fn, AV_TX_FLOAT_MDCT, 0,
+                          1024, &scale, 0)) < 0)
         return ret;
-    if ((ret = ff_mdct_init(&s->mdct128,   8, 0, 32768.0)) < 0)
+    if ((ret = av_tx_init(&s->mdct128, &s->mdct128_fn,   AV_TX_FLOAT_MDCT, 0,
+                          128, &scale, 0)) < 0)
         return ret;
 
     return 0;
diff --git a/libavcodec/aacenc.h b/libavcodec/aacenc.h
index f5a2b78c6d..b030c652ae 100644
--- a/libavcodec/aacenc.h
+++ b/libavcodec/aacenc.h
@@ -109,8 +109,10 @@ typedef struct AACEncContext {
     AVClass *av_class;
     AACEncOptions options;                       ///< encoding options
     PutBitContext pb;
-    FFTContext mdct1024;                         ///< long (1024 samples) frame transform context
-    FFTContext mdct128;                          ///< short (128 samples) frame transform context
+    AVTXContext *mdct1024;                       ///< long (1024 samples) frame transform context
+    av_tx_fn mdct1024_fn;
+    AVTXContext *mdct128;                        ///< short (128 samples) frame transform context
+    av_tx_fn mdct128_fn;
     AVFloatDSPContext *fdsp;
     AACPCEInfo pce;                              ///< PCE data, if needed
     float *planar_samples[16];                   ///< saved preprocessed input