libfdk-aacdec: Reduce the default decoder delay by one frame

The default error concealment method if none is set via
aacDecoder_SetParam(AAC_CONCEAL_METHOD) is set in
CConcealment_InitCommonData within the fdk-aac library
and is set to Energy Interpolation. This method requires one frame
delay to the output. To reduce the default decoder output delay and
avoid missing the last frame in file based decoding, use Noise
Substitution as the default concealment method.
Signed-off-by: Omer Osman <omer.osman@iis.fraunhofer.de>
Signed-off-by: Martin Storsjö <martin@martin.st>

libavcodec/libfdk-aacdec.c

@@ -26,7 +26,6 @@
 #include "internal.h"
 
 enum ConcealMethod {
-    CONCEAL_METHOD_DEFAULT              = -1,
     CONCEAL_METHOD_SPECTRAL_MUTING      =  0,
     CONCEAL_METHOD_NOISE_SUBSTITUTION   =  1,
     CONCEAL_METHOD_ENERGY_INTERPOLATION =  2,
@@ -43,8 +42,7 @@ typedef struct FDKAACDecContext {
 #define OFFSET(x) offsetof(FDKAACDecContext, x)
 #define AD AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM
 static const AVOption fdk_aac_dec_options[] = {
-    { "conceal", "Error concealment method", OFFSET(conceal_method), AV_OPT_TYPE_INT, { .i64 = CONCEAL_METHOD_DEFAULT }, CONCEAL_METHOD_DEFAULT, CONCEAL_METHOD_NB - 1, AD, "conceal" },
-    { "default",  "Default",              0, AV_OPT_TYPE_CONST, { .i64 = CONCEAL_METHOD_DEFAULT },              INT_MIN, INT_MAX, AD, "conceal" },
+    { "conceal", "Error concealment method", OFFSET(conceal_method), AV_OPT_TYPE_INT, { .i64 = CONCEAL_METHOD_NOISE_SUBSTITUTION }, CONCEAL_METHOD_SPECTRAL_MUTING, CONCEAL_METHOD_NB - 1, AD, "conceal" },
     { "spectral", "Spectral muting",      0, AV_OPT_TYPE_CONST, { .i64 = CONCEAL_METHOD_SPECTRAL_MUTING },      INT_MIN, INT_MAX, AD, "conceal" },
     { "noise",    "Noise Substitution",   0, AV_OPT_TYPE_CONST, { .i64 = CONCEAL_METHOD_NOISE_SUBSTITUTION },   INT_MIN, INT_MAX, AD, "conceal" },
     { "energy",   "Energy Interpolation", 0, AV_OPT_TYPE_CONST, { .i64 = CONCEAL_METHOD_ENERGY_INTERPOLATION }, INT_MIN, INT_MAX, AD, "conceal" },
@@ -195,12 +193,10 @@ static av_cold int fdk_aac_decode_init(AVCodecContext *avctx)
         }
     }
 
-    if (s->conceal_method != CONCEAL_METHOD_DEFAULT) {
-        if ((err = aacDecoder_SetParam(s->handle, AAC_CONCEAL_METHOD,
-                                       s->conceal_method)) != AAC_DEC_OK) {
-            av_log(avctx, AV_LOG_ERROR, "Unable to set error concealment method\n");
-            return AVERROR_UNKNOWN;
-        }
+    if ((err = aacDecoder_SetParam(s->handle, AAC_CONCEAL_METHOD,
+                                   s->conceal_method)) != AAC_DEC_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Unable to set error concealment method\n");
+        return AVERROR_UNKNOWN;
     }
 
     avctx->sample_fmt = AV_SAMPLE_FMT_S16;

libavcodec/version.h

@@ -30,7 +30,7 @@
 
 #define LIBAVCODEC_VERSION_MAJOR 55
 #define LIBAVCODEC_VERSION_MINOR 55
-#define LIBAVCODEC_VERSION_MICRO  0
+#define LIBAVCODEC_VERSION_MICRO  1
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
                                                LIBAVCODEC_VERSION_MINOR, \