+static void probe_codec(AVFormatContext *s, AVStream *st, const AVPacket *pkt)
+{
+ if(st->codec->codec_id == CODEC_ID_PROBE){
+ AVProbeData *pd = &st->probe_data;
+ av_log(s, AV_LOG_DEBUG, "probing stream %d\n", st->index);
+ --st->probe_packets;
+
+ if (pkt) {
+ pd->buf = av_realloc(pd->buf, pd->buf_size+pkt->size+AVPROBE_PADDING_SIZE);
+ memcpy(pd->buf+pd->buf_size, pkt->data, pkt->size);
+ pd->buf_size += pkt->size;
+ memset(pd->buf+pd->buf_size, 0, AVPROBE_PADDING_SIZE);
+ } else {
+ st->probe_packets = 0;
+ }
+
+ if (!st->probe_packets ||
+ av_log2(pd->buf_size) != av_log2(pd->buf_size - pkt->size)) {
+ set_codec_from_probe_data(s, st, pd, st->probe_packets > 0 ? AVPROBE_SCORE_MAX/4 : 0);
+ if(st->codec->codec_id != CODEC_ID_PROBE){
+ pd->buf_size=0;
+ av_freep(&pd->buf);
+ av_log(s, AV_LOG_DEBUG, "probed stream %d\n", st->index);
+ }
+ }
+ }
+}
+
+int ff_read_packet(AVFormatContext *s, AVPacket *pkt)