Trim down the ffmpeg library

ffmpeg-hevc-bsf.patch

diff --git a/libavcodec/avpacket.c b/libavcodec/avpacket.c
index 2b20067211..f6ef244063 100644
--- a/libavcodec/avpacket.c
+++ b/libavcodec/avpacket.c
@@ -83,6 +83,7 @@ static int packet_alloc(AVBufferRef **buf, int size)
     return 0;
 }
 
+#if 0
 int av_new_packet(AVPacket *pkt, int size)
 {
     AVBufferRef *buf = NULL;
@@ -148,6 +149,7 @@ int av_grow_packet(AVPacket *pkt, int grow_by)
 
     return 0;
 }
+#endif //0
 
 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size)
 {
@@ -165,6 +167,7 @@ int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size)
     return 0;
 }
 
+#if 0
 #if FF_API_AVPACKET_OLD_API
 FF_DISABLE_DEPRECATION_WARNINGS
 #define ALLOC_MALLOC(data, size) data = av_malloc(size)
@@ -267,6 +270,7 @@ int av_copy_packet(AVPacket *dst, const AVPacket *src)
 FF_ENABLE_DEPRECATION_WARNINGS
 #endif
 
+#endif //0
 void av_packet_free_side_data(AVPacket *pkt)
 {
     int i;
@@ -347,6 +351,7 @@ uint8_t *av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
     return data;
 }
 
+#if 0
 uint8_t *av_packet_get_side_data(const AVPacket *pkt, enum AVPacketSideDataType type,
                                  int *size)
 {
@@ -561,6 +566,7 @@ int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
     }
     return AVERROR(ENOENT);
 }
+#endif 
 
 int av_packet_copy_props(AVPacket *dst, const AVPacket *src)
 {
@@ -639,6 +645,7 @@ fail:
     return ret;
 }
 
+#if 0
 AVPacket *av_packet_clone(const AVPacket *src)
 {
     AVPacket *ret = av_packet_alloc();
@@ -741,3 +748,4 @@ int ff_side_data_set_encoder_stats(AVPacket *pkt, int quality, int64_t *error, i
 
     return 0;
 }
+#endif 
diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index a6a646636d..30f30b1222 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -65,7 +65,7 @@
 #include "libavutil/ffversion.h"
 const char av_codec_ffversion[] = "FFmpeg version " FFMPEG_VERSION;
 
-static AVMutex codec_mutex = AV_MUTEX_INITIALIZER;
+//static AVMutex codec_mutex = AV_MUTEX_INITIALIZER;
 
 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
 {
@@ -79,6 +79,7 @@ void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
         memset(*p + min_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
 }
 
+#if 0
 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size)
 {
     uint8_t **p = ptr;
@@ -2232,3 +2233,4 @@ int ff_int_from_list_or_default(void *ctx, const char * val_name, int val,
            "%s %d are not supported. Set to default value : %d\n", val_name, val, default_value);
     return default_value;
 }
+#endif