aac_latm: reconfigure decoder on audio specific config changes

libavcodec/aacdec.c

@@ -2319,8 +2319,9 @@ static inline uint32_t latm_get_value(GetBitContext *b)
 static int latm_decode_audio_specific_config(struct LATMContext *latmctx,
                                              GetBitContext *gb, int asclen)
 {
-    AVCodecContext *avctx = latmctx->aac_ctx.avctx;
-    MPEG4AudioConfig m4ac;
+    AACContext *ac        = &latmctx->aac_ctx;
+    AVCodecContext *avctx = ac->avctx;
+    MPEG4AudioConfig m4ac = {0};
     int config_start_bit  = get_bits_count(gb);
     int sync_extension    = 0;
     int bits_consumed, esize;
@@ -2335,18 +2336,23 @@ static int latm_decode_audio_specific_config(struct LATMContext *latmctx,
         av_log_missing_feature(latmctx->aac_ctx.avctx, "audio specific "
                                "config not byte aligned.\n", 1);
         return AVERROR_INVALIDDATA;
-    } else {
-        bits_consumed =
-            decode_audio_specific_config(NULL, avctx, &m4ac,
+    }
+    bits_consumed = decode_audio_specific_config(NULL, avctx, &m4ac,
                                          gb->buffer + (config_start_bit / 8),
                                          asclen, sync_extension);
 
     if (bits_consumed < 0)
         return AVERROR_INVALIDDATA;
 
+    if (ac->m4ac.sample_rate != m4ac.sample_rate ||
+        ac->m4ac.chan_config != m4ac.chan_config) {
+
+        av_log(avctx, AV_LOG_INFO, "audio config changed\n");
+        latmctx->initialized = 0;
+
         esize = (bits_consumed+7) / 8;
 
-        if (avctx->extradata_size <= esize) {
+        if (avctx->extradata_size < esize) {
             av_free(avctx->extradata);
             avctx->extradata = av_malloc(esize + FF_INPUT_BUFFER_PADDING_SIZE);
             if (!avctx->extradata)
@@ -2356,9 +2362,8 @@ static int latm_decode_audio_specific_config(struct LATMContext *latmctx,
         avctx->extradata_size = esize;
         memcpy(avctx->extradata, gb->buffer + (config_start_bit/8), esize);
         memset(avctx->extradata+esize, 0, FF_INPUT_BUFFER_PADDING_SIZE);
-
-        skip_bits_long(gb, bits_consumed);
     }
+    skip_bits_long(gb, bits_consumed);
 
     return bits_consumed;
 }