latmdec: fix audio specific config parsing

Pass the correct size in bits to mpeg4audio_get_config and add a flag
to disable parsing of the sync extension when the size is not known.

Latm with AudioMuxVersion 0 does not specify the size of the audio
specific config. Data after the audio specific config can be
misinterpreted as sync extension resulting in random and wrong configs.

1 files changed, 1 insertions, 1 deletions

diff --git a/libavformat/latmenc.c b/libavformat/latmenc.c
index 679f2cc9c6..423710ddea 100644
--- a/libavformat/latmenc.c
+++ b/libavformat/latmenc.c
@@ -54,7 +54,7 @@ static int latm_decode_extradata(LATMContext *ctx, uint8_t *buf, int size)
     MPEG4AudioConfig m4ac;
 
     init_get_bits(&gb, buf, size * 8);
-    ctx->off = avpriv_mpeg4audio_get_config(&m4ac, buf, size);
+    ctx->off = avpriv_mpeg4audio_get_config(&m4ac, buf, size * 8, 1);
     if (ctx->off < 0)
         return ctx->off;
     skip_bits_long(&gb, ctx->off);