static void sdp_parse_fmtp_config(AVCodecContext *codec, char *attr, char *value) { switch (codec->codec_id) { case CODEC_ID_MPEG4: case CODEC_ID_AAC: if (!strcmp(attr, "config")) { /* decode the hexa encoded parameter */ int len = hex_to_data(NULL, value); codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE); if (!codec->extradata) return; codec->extradata_size = len; hex_to_data(codec->extradata, value); } break; default: break; } return; }