Index: ffmpeg-4.2.1/configure

===================================================================

--- ffmpeg-4.2.1.orig/configure

+++ ffmpeg-4.2.1/configure

@@ -232,6 +232,7 @@ External library support:

   --enable-libdc1394       enable IIDC-1394 grabbing using libdc1394

                            and libraw1394 [no]

   --enable-libfdk-aac      enable AAC de/encoding via libfdk-aac [no]

+  --enable-libfdk-aac-dlopen enable AAC de/encoding via dlopen()'ed libfdk-aac [no]

   --enable-libflite        enable flite (voice synthesis) support via libflite [no]

   --enable-libfontconfig   enable libfontconfig, useful for drawtext filter [no]

   --enable-libfreetype     enable libfreetype, needed for drawtext filter [no]

@@ -1724,6 +1725,7 @@ EXTERNAL_LIBRARY_GPL_LIST="

 EXTERNAL_LIBRARY_NONFREE_LIST="

     decklink

     libfdk_aac

+    libfdk_aac_dlopen

     openssl

     libtls

 "

@@ -6203,6 +6205,7 @@ enabled libdrm            && require_pkg

 enabled libfdk_aac        && { check_pkg_config libfdk_aac fdk-aac "fdk-aac/aacenc_lib.h" aacEncOpen ||

                                { require libfdk_aac fdk-aac/aacenc_lib.h aacEncOpen -lfdk-aac &&

                                  warn "using libfdk without pkg-config"; } }

+enabled libfdk_aac_dlopen && enable libfdk_aac && add_cppflags "-I/usr/include/fdk-aac"

 flite_extralibs="-lflite_cmu_time_awb -lflite_cmu_us_awb -lflite_cmu_us_kal -lflite_cmu_us_kal16 -lflite_cmu_us_rms -lflite_cmu_us_slt -lflite_usenglish -lflite_cmulex -lflite"

 enabled libflite          && require libflite "flite/flite.h" flite_init $flite_extralibs

 enabled fontconfig        && enable libfontconfig

Index: ffmpeg-4.2.1/libavcodec/dlopen.h

===================================================================

--- /dev/null

+++ ffmpeg-4.2.1/libavcodec/dlopen.h

@@ -0,0 +1,12 @@

+#ifndef LOCALINC_DLOPEN_H

+#define LOCALINC_DLOPEN_H

+#include <dlfcn.h>

+#define num2str(x) str(x)

+#define str(x) #x

+

+#define dl_sym(func, args, lib) \

+   dl_##func = args dlsym(lib, #func); \

+   if ((err = dlerror())) \

+       goto error;

+

+#endif

Index: ffmpeg-4.2.1/libavcodec/libfdk-aacdec.c

===================================================================

--- ffmpeg-4.2.1.orig/libavcodec/libfdk-aacdec.c

+++ ffmpeg-4.2.1/libavcodec/libfdk-aacdec.c

@@ -37,6 +37,54 @@

 #define AAC_PCM_MAX_OUTPUT_CHANNELS AAC_PCM_OUTPUT_CHANNELS

 #endif

+#ifdef CONFIG_LIBFDK_AAC_DLOPEN

+#include "dlopen.h"

+AAC_DECODER_ERROR (*dl_aacDecoder_AncDataInit)(HANDLE_AACDECODER, UCHAR*, int);

+HANDLE_AACDECODER (*dl_aacDecoder_Open)(TRANSPORT_TYPE, UINT);

+AAC_DECODER_ERROR (*dl_aacDecoder_Fill)(HANDLE_AACDECODER, UCHAR**, const UINT*, UINT*);

+AAC_DECODER_ERROR (*dl_aacDecoder_ConfigRaw)(HANDLE_AACDECODER, UCHAR **, const UINT*);

+AAC_DECODER_ERROR (*dl_aacDecoder_SetParam)(const HANDLE_AACDECODER, const AACDEC_PARAM, const INT);

+AAC_DECODER_ERROR (*dl_aacDecoder_DecodeFrame)(HANDLE_AACDECODER, INT_PCM*, const INT, const UINT);

+CStreamInfo* (*dl_aacDecoder_GetStreamInfo)(HANDLE_AACDECODER);

+void (*dl_aacDecoder_Close)(HANDLE_AACDECODER);

+#define aacDecoder_AncDataInit dl_aacDecoder_AncDataInit

+#define aacDecoder_Open dl_aacDecoder_Open

+#define aacDecoder_Fill dl_aacDecoder_Fill

+#define aacDecoder_ConfigRaw dl_aacDecoder_ConfigRaw

+#define aacDecoder_SetParam dl_aacDecoder_SetParam

+#define aacDecoder_DecodeFrame dl_aacDecoder_DecodeFrame

+#define aacDecoder_GetStreamInfo dl_aacDecoder_GetStreamInfo

+#define aacDecoder_Close dl_aacDecoder_Close

+#define FDKAAC_LIB "libfdk-aac.so.1"

+static int loadLibFdkAac(AVCodecContext *avctx);

+static int loadLibFdkAac(AVCodecContext *avctx) {

+   void *libfdkaac = NULL;

+   const char *err = NULL;

+   

+   libfdkaac = dlopen(FDKAAC_LIB, RTLD_LAZY);

+   if(err = dlerror()) {

+       av_log(avctx, AV_LOG_FATAL, "%s\n%s is missing, libfdk-aac support will be disabled\n", err, FDKAAC_LIB);

+       if(libfdkaac)

+           dlclose(libfdkaac);

+       return 1;

+   }

+   dl_sym(aacDecoder_AncDataInit, (AAC_DECODER_ERROR (*)(HANDLE_AACDECODER, UCHAR*, int)), libfdkaac);

+   dl_sym(aacDecoder_Open, (HANDLE_AACDECODER (*)(TRANSPORT_TYPE, UINT)), libfdkaac);

+   dl_sym(aacDecoder_Fill, (AAC_DECODER_ERROR (*)(HANDLE_AACDECODER, UCHAR**, const UINT*, UINT*)), libfdkaac);

+   dl_sym(aacDecoder_ConfigRaw, (AAC_DECODER_ERROR (*)(HANDLE_AACDECODER, UCHAR**, const UINT*)), libfdkaac);

+   dl_sym(aacDecoder_SetParam, (AAC_DECODER_ERROR (*)(const HANDLE_AACDECODER, const AACDEC_PARAM, const INT)), libfdkaac);

+   dl_sym(aacDecoder_DecodeFrame, (AAC_DECODER_ERROR (*)(HANDLE_AACDECODER, INT_PCM*, const INT, const UINT)), libfdkaac);

+   dl_sym(aacDecoder_GetStreamInfo, (CStreamInfo* (*)(HANDLE_AACDECODER)), libfdkaac);

+   dl_sym(aacDecoder_Close, (void (*)(HANDLE_AACDECODER)), libfdkaac);

+   return 0;

+error:

+   av_log(avctx, AV_LOG_FATAL, "libfdk-aac: Missing symbols in %s: %s\n"

+       "libfdk-aac support disabled\n", FDKAAC_LIB, err);

+   dlclose(libfdkaac);

+   return 1;

+}

+#endif

+

 enum ConcealMethod {

     CONCEAL_METHOD_SPECTRAL_MUTING      =  0,

     CONCEAL_METHOD_NOISE_SUBSTITUTION   =  1,

@@ -224,6 +272,11 @@ static av_cold int fdk_aac_decode_init(A

     FDKAACDecContext *s = avctx->priv_data;

     AAC_DECODER_ERROR err;

+#ifdef CONFIG_LIBFDK_AAC_DLOPEN

+    if (loadLibFdkAac(avctx))

+        return -1;

+#endif

+

     s->handle = aacDecoder_Open(avctx->extradata_size ? TT_MP4_RAW : TT_MP4_ADTS, 1);

     if (!s->handle) {

         av_log(avctx, AV_LOG_ERROR, "Error opening decoder\n");

Index: ffmpeg-4.2.1/libavcodec/libfdk-aacenc.c

===================================================================

--- ffmpeg-4.2.1.orig/libavcodec/libfdk-aacenc.c

+++ ffmpeg-4.2.1/libavcodec/libfdk-aacenc.c

@@ -34,6 +34,48 @@

 #define FDKENC_VER_AT_LEAST(vl0, vl1) 0

 #endif

+#ifdef CONFIG_LIBFDK_AAC_DLOPEN

+#include "dlopen.h"

+#include <fdk-aac/aacdecoder_lib.h>

+AACENC_ERROR (*dl_aacEncOpen)(HANDLE_AACENCODER*, const UINT, const UINT);

+AACENC_ERROR (*dl_aacEncoder_SetParam)(const HANDLE_AACENCODER, const AACENC_PARAM, const UINT);

+AACENC_ERROR (*dl_aacEncEncode)(const HANDLE_AACENCODER, const AACENC_BufDesc*, const AACENC_BufDesc*, const AACENC_InArgs*, AACENC_OutArgs*);

+AACENC_ERROR (*dl_aacEncInfo)(const HANDLE_AACENCODER, AACENC_InfoStruct*);

+AACENC_ERROR (*dl_aacEncClose)(HANDLE_AACENCODER*);

+

+#define aacEncOpen dl_aacEncOpen

+#define aacEncoder_SetParam dl_aacEncoder_SetParam

+#define aacEncEncode dl_aacEncEncode

+#define aacEncInfo dl_aacEncInfo

+#define aacEncClose dl_aacEncClose

+#define FDKAAC_LIB "libfdk-aac.so.1"

+

+static int loadLibFdkAac(AVCodecContext *avctx);

+static int loadLibFdkAac(AVCodecContext *avctx) {

+   void *libfdkaac = NULL;

+   const char *err = NULL;

+   

+   libfdkaac = dlopen(FDKAAC_LIB, RTLD_LAZY);

+   if(err = dlerror()) {

+       av_log(avctx, AV_LOG_FATAL, "%s\n%s is missing, libfdk-aac support will be disabled\n", err, FDKAAC_LIB);

+       if(libfdkaac)

+           dlclose(libfdkaac);

+       return 1;

+   }

+   dl_sym(aacEncOpen, (AACENC_ERROR (*)(HANDLE_AACENCODER*, const UINT, const UINT)), libfdkaac);

+   dl_sym(aacEncoder_SetParam, (AACENC_ERROR (*)(const HANDLE_AACENCODER, const AACENC_PARAM, const UINT)), libfdkaac);

+   dl_sym(aacEncEncode, (AACENC_ERROR (*)(const HANDLE_AACENCODER, const AACENC_BufDesc*, const AACENC_BufDesc*, const AACENC_InArgs*, AACENC_OutArgs*)), libfdkaac);

+   dl_sym(aacEncInfo, (AACENC_ERROR (*)(const HANDLE_AACENCODER, AACENC_InfoStruct*)), libfdkaac);

+   dl_sym(aacEncClose, (AACENC_ERROR (*)(HANDLE_AACENCODER*)), libfdkaac);

+   return 0;

+error:

+   av_log(avctx, AV_LOG_FATAL, "libfdk-aac: Missing symbols in %s: %s\n"

+       "libfdk-aac support disabled\n", FDKAAC_LIB, err);

+   dlclose(libfdkaac);

+   return 1;

+}

+#endif

+

 typedef struct AACContext {

     const AVClass *class;

     HANDLE_AACENCODER handle;

@@ -126,6 +168,11 @@ static av_cold int aac_encode_init(AVCod

     int aot = FF_PROFILE_AAC_LOW + 1;

     int sce = 0, cpe = 0;

+#ifdef CONFIG_LIBFDK_AAC_DLOPEN

+    if (loadLibFdkAac(avctx))

+        return -1;

+#endif

+

     if ((err = aacEncOpen(&s->handle, 0, avctx->channels)) != AACENC_OK) {

         av_log(avctx, AV_LOG_ERROR, "Unable to open the encoder: %s\n",

                aac_get_error(err));

​